"Up to my old tricks": a 38 knot ship with 9-14in guns

I could not resist doing my usual thing ("My old tricks"). I tried a 38 knot battlecruiser with 9-14in guns. The belt is 7in and the deck is 4in. The secondary and AA armaments are what I have been using. They are unchanged from the other ships in this series. I still like having a big ship that will outrun smaller ships in a seaway. There is essentially nothing at sea that this ship cannot catch. Some smaller ships may be faster in a flat calm, for a short time, but in normal conditions, they will not be able to run away. This ship can outrun anything, but aircraft, that could damage it. This is the Springsharp report:

GB/CB/1921 14in guns 38 knots, Great Britain Battlecruiser laid down 1923 (Engine 1940)

Displacement:
 43,543 t light; 45,203 t standard; 48,500 t normal; 51,137 t full load

Dimensions: Length overall / water x beam x draught
 881.32 ft / 878.00 ft x 114.00 ft x 33.00 ft (normal load)
 268.63 m / 267.61 m x 34.75 m  x 10.06 m

Armament:
      9 - 14.00" / 356 mm guns (3x3 guns), 1,372.00lbs / 622.33kg shells, 1923 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1923 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1923 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1923 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 13,537 lbs / 6,140 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 580.00 ft / 176.78 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 580.00 ft / 176.78 m 33.00 ft / 10.06 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 337,652 shp / 251,888 Kw = 38.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 5,934 tons

Complement:
 1,633 - 2,124

Cost:
 £12.245 million / $48.981 million

Distribution of weights at normal displacement:
 Armament: 1,692 tons, 3.5 %
 Armour: 11,812 tons, 24.4 %
    - Belts: 2,763 tons, 5.7 %
    - Torpedo bulkhead: 708 tons, 1.5 %
    - Armament: 2,884 tons, 5.9 %
    - Armour Deck: 5,200 tons, 10.7 %
    - Conning Tower: 258 tons, 0.5 %
 Machinery: 9,028 tons, 18.6 %
 Hull, fittings & equipment: 21,010 tons, 43.3 %
 Fuel, ammunition & stores: 4,957 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   69,860 lbs / 31,688 Kg = 50.9 x 14.0 " / 356 mm shells or 8.0 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 8.0 ft / 2.4 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.49
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.514
 Length to Beam Ratio: 7.70 : 1
 'Natural speed' for length: 34.49 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  38.00 ft / 11.58 m
    - Forecastle (20 %): 32.00 ft / 9.75 m
    - Mid (35 %):  32.00 ft / 9.75 m
    - Quarterdeck (15 %): 32.00 ft / 9.75 m
    - Stern:  32.00 ft / 9.75 m
    - Average freeboard: 32.48 ft / 9.90 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 105.3 %
  - Above water (accommodation/working, high = better): 262.3 %
 Waterplane Area: 70,264 Square feet or 6,528 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 206 lbs/sq ft or 1,008 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.65
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

The 35-knot battlecruiser with 9-15in guns

The next step seemed to be to increase the armament of the 35-knot battlecruiser (GB/CB/1921) to 9-15in guns. I decreased the belt to 6in and reduced the turret faces, barbettes, and conning tower to 8in. The deck is still the thick 4in. The Standard displacement has ballooned to 37,664 tons. Still, the ship is much more potent, and the roll period is still a quite long 16.9 seconds. If anything, the roll period was increased further. This is the Springsharp report:

GB/CB/1921 15in guns 35 knots, Great Britain Battlecruiser laid down 1921 (Engine 1937)

Displacement:
 36,017 t light; 37,664 t standard; 40,700 t normal; 43,129 t full load

Dimensions: Length overall / water x beam x draught
 829.31 ft / 827.00 ft x 104.00 ft x 31.00 ft (normal load)
 252.77 m / 252.07 m x 31.70 m  x 9.45 m

Armament:
      9 - 15.00" / 381 mm guns (3x3 guns), 1,687.50lbs / 765.44kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 16,376 lbs / 7,428 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 530.00 ft / 161.54 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 530.00 ft / 161.54 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  8.00" / 203 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 226,229 shp / 168,767 Kw = 35.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 5,465 tons

Complement:
 1,432 - 1,862

Cost:
 £9.820 million / $39.281 million

Distribution of weights at normal displacement:
 Armament: 2,047 tons, 5.0 %
 Armour: 9,483 tons, 23.3 %
    - Belts: 1,630 tons, 4.0 %
    - Torpedo bulkhead: 569 tons, 1.4 %
    - Armament: 2,526 tons, 6.2 %
    - Armour Deck: 4,555 tons, 11.2 %
    - Conning Tower: 204 tons, 0.5 %
 Machinery: 6,270 tons, 15.4 %
 Hull, fittings & equipment: 18,217 tons, 44.8 %
 Fuel, ammunition & stores: 4,683 tons, 11.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   53,385 lbs / 24,215 Kg = 31.6 x 15.0 " / 381 mm shells or 6.2 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 6.7 ft / 2.0 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.71
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.534
 Length to Beam Ratio: 7.95 : 1
 'Natural speed' for length: 33.30 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (35 %):  27.00 ft / 8.23 m
    - Quarterdeck (15 %): 27.00 ft / 8.23 m
    - Stern:  27.00 ft / 8.23 m
    - Average freeboard: 27.48 ft / 8.38 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 108.6 %
  - Above water (accommodation/working, high = better): 221.1 %
 Waterplane Area: 61,556 Square feet or 5,719 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 208 lbs/sq ft or 1,014 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.47
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

The very fast, Renown-Repulse type ship

This design has very little in common with the Renown and Repulse, except that this ship also has a main armament of 6-15in guns. Otherwise, this is a further expansion of the 12in-gunned, 35 knot design. This is the Springsharp report:

GB/CB/1921 15in guns 35 knots, Great Britain Battlecruiser laid down 1921 (Engine 1937)

Displacement:
 32,345 t light; 33,654 t standard; 36,500 t normal; 38,777 t full load

Dimensions: Length overall / water x beam x draught
 816.31 ft / 814.00 ft x 102.00 ft x 29.00 ft (normal load)
 248.81 m / 248.11 m x 31.09 m  x 8.84 m

Armament:
      6 - 15.00" / 381 mm guns (3x2 guns), 1,687.50lbs / 765.44kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 11,314 lbs / 5,132 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 530.00 ft / 161.54 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 530.00 ft / 161.54 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 212,697 shp / 158,672 Kw = 35.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 5,123 tons

Complement:
 1,319 - 1,716

Cost:
 £8.006 million / $32.025 million

Distribution of weights at normal displacement:
 Armament: 1,414 tons, 3.9 %
 Armour: 9,336 tons, 25.6 %
    - Belts: 1,894 tons, 5.2 %
    - Torpedo bulkhead: 569 tons, 1.6 %
    - Armament: 2,278 tons, 6.2 %
    - Armour Deck: 4,382 tons, 12.0 %
    - Conning Tower: 213 tons, 0.6 %
 Machinery: 5,895 tons, 16.2 %
 Hull, fittings & equipment: 15,699 tons, 43.0 %
 Fuel, ammunition & stores: 4,155 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   53,960 lbs / 24,476 Kg = 32.0 x 15.0 " / 381 mm shells or 6.6 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.53
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.531
 Length to Beam Ratio: 7.98 : 1
 'Natural speed' for length: 33.04 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (35 %):  27.00 ft / 8.23 m
    - Quarterdeck (15 %): 27.00 ft / 8.23 m
    - Stern:  27.00 ft / 8.23 m
    - Average freeboard: 27.48 ft / 8.38 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 101.7 %
  - Above water (accommodation/working, high = better): 230.9 %
 Waterplane Area: 59,214 Square feet or 5,501 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 187 lbs/sq ft or 913 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.41
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

With a few modifications, the "cruiser killer" can make 35 knots

I decided to see if I could modify the last design to reach 35 knots. The WL length was increased to 814ft and the beam to 88ft. The new draft is 27 ft. The armament and armour are essentially unchanged. I like the fact that the roll period is a nice and long 16.4 seconds. The belt is still 7in and the deck is still 4in. That provides adequate protection for what this ship would need to worry about. I would hope that is someone sees a problem, they would let me know so that I can correct whatever it might be. This is the Springsharp report:

GB/CB/1921 12in guns, Great Britain Battlecruiser laid down 1921 (Engine 1937)

Displacement:
 28,702 t light; 29,814 t standard; 32,500 t normal; 34,649 t full load

Dimensions: Length overall / water x beam x draught
 816.24 ft / 814.00 ft x 88.00 ft x 27.00 ft (normal load)
 248.79 m / 248.11 m x 26.82 m  x 8.23 m

Armament:
      9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 8,965 lbs / 4,066 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 530.00 ft / 161.54 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 530.00 ft / 161.54 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 202,688 shp / 151,206 Kw = 35.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 4,835 tons

Complement:
 1,209 - 1,573

Cost:
 £6.955 million / $27.820 million

Distribution of weights at normal displacement:
 Armament: 1,121 tons, 3.4 %
 Armour: 8,677 tons, 26.7 %
    - Belts: 1,873 tons, 5.8 %
    - Torpedo bulkhead: 471 tons, 1.4 %
    - Armament: 2,141 tons, 6.6 %
    - Armour Deck: 3,995 tons, 12.3 %
    - Conning Tower: 197 tons, 0.6 %
 Machinery: 5,618 tons, 17.3 %
 Hull, fittings & equipment: 13,286 tons, 40.9 %
 Fuel, ammunition & stores: 3,798 tons, 11.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   46,657 lbs / 21,163 Kg = 54.0 x 12.0 " / 305 mm shells or 5.3 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 5.1 ft / 1.6 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.68
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.588
 Length to Beam Ratio: 9.25 : 1
 'Natural speed' for length: 32.45 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (35 %):  26.00 ft / 7.92 m
    - Quarterdeck (15 %): 26.00 ft / 7.92 m
    - Stern:  26.00 ft / 7.92 m
    - Average freeboard: 26.48 ft / 8.07 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 106.5 %
  - Above water (accommodation/working, high = better): 221.1 %
 Waterplane Area: 53,986 Square feet or 5,015 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 169 lbs/sq ft or 823 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.19
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

The 12in-gunned cruiser killer: GB/CB/1921

The next natural step seemed to be to have a 12in-gunned version of the cruiser killer. This version has a 7in belt and 4in deck. The turret faces and barbettes are 9in, as is the conning tower. The armament is unchanged from the 10in-gunned version, except for the main armament caliber. This is the Springsharp report:

GB/CB/1921 12in guns, Great Britain Battlecruiser laid down 1921 (Engine 1937)

Displacement:
 26,312 t light; 27,425 t standard; 30,000 t normal; 32,060 t full load

Dimensions: Length overall / water x beam x draught
 785.62 ft / 784.00 ft x 87.00 ft x 25.00 ft (normal load)
 239.46 m / 238.96 m x 26.52 m  x 7.62 m

Armament:
      9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 8,965 lbs / 4,066 kg
 Shells per gun, main battery: 100

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 495.00 ft / 150.88 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 97 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 495.00 ft / 150.88 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 158,102 shp / 117,944 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 4,635 tons

Complement:
 1,139 - 1,481

Cost:
 £6.302 million / $25.207 million

Distribution of weights at normal displacement:
 Armament: 1,121 tons, 3.7 %
 Armour: 8,381 tons, 27.9 %
    - Belts: 1,764 tons, 5.9 %
    - Torpedo bulkhead: 440 tons, 1.5 %
    - Armament: 2,085 tons, 6.9 %
    - Armour Deck: 3,906 tons, 13.0 %
    - Conning Tower: 187 tons, 0.6 %
 Machinery: 4,382 tons, 14.6 %
 Hull, fittings & equipment: 12,428 tons, 41.4 %
 Fuel, ammunition & stores: 3,688 tons, 12.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   47,178 lbs / 21,400 Kg = 54.6 x 12.0 " / 305 mm shells or 5.7 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 5.1 ft / 1.5 m
 Roll period: 16.2 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.70
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.616
 Length to Beam Ratio: 9.01 : 1
 'Natural speed' for length: 31.83 kts
 Power going to wave formation at top speed: 55 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (35 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.48 ft / 7.77 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 98.7 %
  - Above water (accommodation/working, high = better): 220.7 %
 Waterplane Area: 52,780 Square feet or 4,903 Square metres
 Displacement factor (Displacement / loading): 115 %
 Structure weight / hull surface area: 166 lbs/sq ft or 809 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.16
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

A heavy cruiser with 10in guns

I am pretty happy with this heavy cruiser with 9-10in BLR, 16-4.7in QF, 6-4.7in AA, and 24-2pdr AA guns. The speed is still 33 knots and the armour basis is 5in with a 3in deck. The range is 7,500nm at 18 knots. I am not sure how well this ship would fare against 8in-gunned cruisers, but I would hope that it could outgun and outrange them. This is the Springsharp report:

GB/CA/1921 10in guns, Great Britain Heavy Cruiser laid down 1921 (Engine 1937)

Displacement:
 19,385 t light; 20,162 t standard; 22,300 t normal; 24,010 t full load

Dimensions: Length overall / water x beam x draught
 716.62 ft / 715.00 ft x 78.00 ft x 23.00 ft (normal load)
 218.43 m / 217.93 m x 23.77 m  x 7.01 m

Armament:
      9 - 10.00" / 254 mm guns (3x3 guns), 500.00lbs / 226.80kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 5,689 lbs / 2,580 kg
 Shells per gun, main battery: 100

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 475.00 ft / 144.78 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 475.00 ft / 144.78 m 23.00 ft / 7.01 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  8.00" / 203 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 135,206 shp / 100,864 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 3,849 tons

Complement:
 912 - 1,186

Cost:
 £4.583 million / $18.332 million

Distribution of weights at normal displacement:
 Armament: 711 tons, 3.2 %
 Armour: 5,680 tons, 25.5 %
    - Belts: 1,197 tons, 5.4 %
    - Torpedo bulkhead: 404 tons, 1.8 %
    - Armament: 1,598 tons, 7.2 %
    - Armour Deck: 2,379 tons, 10.7 %
    - Conning Tower: 102 tons, 0.5 %
 Machinery: 3,747 tons, 16.8 %
 Hull, fittings & equipment: 9,246 tons, 41.5 %
 Fuel, ammunition & stores: 2,915 tons, 13.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   35,144 lbs / 15,941 Kg = 70.3 x 10.0 " / 254 mm shells or 4.4 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 4.2 ft / 1.3 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.608
 Length to Beam Ratio: 9.17 : 1
 'Natural speed' for length: 30.37 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (35 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.48 ft / 7.77 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 106.3 %
  - Above water (accommodation/working, high = better): 223.8 %
 Waterplane Area: 42,857 Square feet or 3,982 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 147 lbs/sq ft or 716 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.27
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

A 33-knot heavy cruiser with 8-9.2in guns

This is a rather different approach to a 9.2in-gunned, heavy cruiser. The version is designed to make 33 knots. The hull is flush-decked with a transom stern. The main armament is 9-9.2in BLR in triple turrets. The armour basis is 4in with a 2in deck. The cruising range is 7,500nm at 18 knots. The Standard displacement is 13,988 tons. This is the Springsharp report:

GB/CA/1921, Great Britain Heavy Cruiser laid down 1921 (Engine 1937)

Displacement:
 13,393 t light; 13,988 t standard; 15,700 t normal; 17,069 t full load

Dimensions: Length overall / water x beam x draught
 666.36 ft / 665.00 ft x 65.00 ft x 22.00 ft (normal load)
 203.11 m / 202.69 m x 19.81 m  x 6.71 m

Armament:
      9 - 9.20" / 234 mm guns (3x3 guns), 389.34lbs / 176.60kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 4,079 lbs / 1,850 kg
 Shells per gun, main battery: 120

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 425.00 ft / 129.54 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 98 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 425.00 ft / 129.54 m 22.00 ft / 6.71 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 109,062 shp / 81,360 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 3,081 tons

Complement:
 700 - 911

Cost:
 £3.361 million / $13.442 million

Distribution of weights at normal displacement:
 Armament: 510 tons, 3.2 %
 Armour: 3,267 tons, 20.8 %
    - Belts: 852 tons, 5.4 %
    - Torpedo bulkhead: 346 tons, 2.2 %
    - Armament: 822 tons, 5.2 %
    - Armour Deck: 1,194 tons, 7.6 %
    - Conning Tower: 54 tons, 0.3 %
 Machinery: 3,023 tons, 19.3 %
 Hull, fittings & equipment: 6,593 tons, 42.0 %
 Fuel, ammunition & stores: 2,307 tons, 14.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   22,006 lbs / 9,982 Kg = 56.5 x 9.2 " / 234 mm shells or 2.8 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 3.1 ft / 0.9 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.91
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.578
 Length to Beam Ratio: 10.23 : 1
 'Natural speed' for length: 29.14 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  26.00 ft / 7.92 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (35 %):  23.00 ft / 7.01 m
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 23.24 ft / 7.08 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 126.5 %
  - Above water (accommodation/working, high = better): 201.9 %
 Waterplane Area: 32,257 Square feet or 2,997 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 128 lbs/sq ft or 626 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.40
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

My attempt at a "cruiser killer" along the lines of what Frank Fox had suggested

Frank Fox had told me that he preferred something more along the lines of a 9.2in-gunned heavy cruiser for a "cruiser killer", rather than something similar to a battleship or battlecruiser. On 17 February 2002, I tried such a design. The ship has 8-9.2 BLR and 8-4.7in QF guns. The speed is 32 knots. The armour basis is 6in with a 2in deck. The ship can cruise for 6,500 nm at 18 knots. This is the Springsharp report:

GB/CA/1921, Great Britain Heavy Cruiser laid down 1921 (Engine 1937)

Displacement:
 13,299 t light; 13,849 t standard; 15,404 t normal; 16,649 t full load

Dimensions: Length overall / water x beam x draught
 630.00 ft / 630.00 ft x 63.00 ft x 24.00 ft (normal load)
 192.02 m / 192.02 m x 19.20 m  x 7.32 m

Armament:
      8 - 9.20" / 234 mm guns (4x2 guns), 389.34lbs / 176.60kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 3,530 lbs / 1,601 kg
 Shells per gun, main battery: 120

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 375.00 ft / 114.30 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 92 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 375.00 ft / 114.30 m 23.00 ft / 7.01 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 110,567 shp / 82,483 Kw = 32.00 kts
 Range 6,500nm at 18.00 kts
 Bunker at max displacement = 2,800 tons

Complement:
 690 - 898

Cost:
 £3.220 million / $12.882 million

Distribution of weights at normal displacement:
 Armament: 441 tons, 2.9 %
 Armour: 4,019 tons, 26.1 %
    - Belts: 1,523 tons, 9.9 %
    - Torpedo bulkhead: 479 tons, 3.1 %
    - Armament: 897 tons, 5.8 %
    - Armour Deck: 1,040 tons, 6.8 %
    - Conning Tower: 80 tons, 0.5 %
 Machinery: 3,064 tons, 19.9 %
 Hull, fittings & equipment: 5,775 tons, 37.5 %
 Fuel, ammunition & stores: 2,105 tons, 13.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   18,738 lbs / 8,499 Kg = 48.1 x 9.2 " / 234 mm shells or 2.6 torpedoes
 Stability (Unstable if below 1.00): 1.02
 Metacentric height 2.6 ft / 0.8 m
 Roll period: 16.3 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.89
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.566
 Length to Beam Ratio: 10.00 : 1
 'Natural speed' for length: 25.10 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 55
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  29.00 ft / 8.84 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (35 %):  27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 21.96 ft / 6.69 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 127.2 %
  - Above water (accommodation/working, high = better): 161.8 %
 Waterplane Area: 28,118 Square feet or 2,612 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 123 lbs/sq ft or 600 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.37
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

My GB/CA/1921 "1921-style" armoured cruiser

I have a drawing and specification dated 27 April 2002 that I did while I was working towards the end of my first contract in Minnesota. By this date, I had seen the sort of design work that Frank Fox was doing, and that influenced what I was doing with this ship. I even have an inboard profile that I drew, mimicking what I had seen Frank Fox do. My ship was different from anything that Frank has been doing, as he is interested in American WWII designs, while I tend towards British ships from 1905 to 1927, although I do ships up to 1945. To make this work in Springsharp, I had to increase the displacement by about 3,300 tons and the freeboard by one foot. This is the Springsharp report:

GB/CA/1921, Great Britain Armoured Cruiser laid down 1921 (Engine 1937)

Displacement:
 23,387 t light; 24,291 t standard; 25,700 t normal; 26,827 t full load

Dimensions: Length overall / water x beam x draught
 715.00 ft / 715.00 ft x 85.00 ft x 23.00 ft (normal load)
 217.93 m / 217.93 m x 25.91 m  x 7.01 m

Armament:
      9 - 10.00" / 254 mm guns (3x3 guns), 500.00lbs / 226.80kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 5.50" / 140 mm guns (4x2 guns), 83.19lbs / 37.73kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, all raised mounts - superfiring
      2 - 5.50" / 140 mm guns (1x2 guns), 83.19lbs / 37.73kg shells, 1921 Model
   Quick firing guns in a turret (on a barbette)
   on centreline aft, all raised guns - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 5,643 lbs / 2,560 kg
 Shells per gun, main battery: 120

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 405.00 ft / 123.44 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 87 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 405.00 ft / 123.44 m 23.00 ft / 7.01 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 10.0" / 254 mm  10.0" / 254 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm
 3rd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 3.75" / 95 mm, Conning tower: 7.00" / 178 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 134,120 shp / 100,054 Kw = 32.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,535 tons

Complement:
 1,014 - 1,319

Cost:
 £4.917 million / $19.666 million

Distribution of weights at normal displacement:
 Armament: 705 tons, 2.7 %
 Armour: 8,599 tons, 33.5 %
    - Belts: 2,263 tons, 8.8 %
    - Torpedo bulkhead: 689 tons, 2.7 %
    - Armament: 2,166 tons, 8.4 %
    - Armour Deck: 3,349 tons, 13.0 %
    - Conning Tower: 131 tons, 0.5 %
 Machinery: 3,717 tons, 14.5 %
 Hull, fittings & equipment: 10,365 tons, 40.3 %
 Fuel, ammunition & stores: 2,313 tons, 9.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   45,564 lbs / 20,667 Kg = 91.1 x 10.0 " / 254 mm shells or 6.6 torpedoes
 Stability (Unstable if below 1.00): 1.08
 Metacentric height 4.5 ft / 1.4 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.643
 Length to Beam Ratio: 8.41 : 1
 'Natural speed' for length: 30.48 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 54
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  35.00 ft / 10.67 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (50 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.80 ft / 7.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 89.7 %
  - Above water (accommodation/working, high = better): 226.7 %
 Waterplane Area: 48,277 Square feet or 4,485 Square metres
 Displacement factor (Displacement / loading): 119 %
 Structure weight / hull surface area: 153 lbs/sq ft or 745 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.27
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

My It/DD/1934 design: 36 knots for a price

I was able to achieve 36 knots with the It/DD/1934 design by having a deep draft, high freeboard and a considerable displacement. The ship has 4-4.7in QF guns in twin mounts and has 6-21in TT. The dimensions are 350ft x 34ft, so the size is greater than the preceding classes. This is the Springsharp report:

It/DD/1934, Italy Destroyer laid down 1934 (Engine 1950)

Displacement:
 1,904 t light; 1,965 t standard; 2,150 t normal; 2,298 t full load

Dimensions: Length overall / water x beam x draught
 352.19 ft / 350.00 ft x 34.00 ft x 13.00 ft (normal load)
 107.35 m / 106.68 m x 10.36 m  x 3.96 m

Armament:
      4 - 4.70" / 119 mm guns (2 mounts), 51.91lbs / 23.55kg shells, 1934 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread, 1 raised gun
      4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1934 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 214 lbs / 97 kg
 Shells per gun, main battery: 150
 6 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 69,129 shp / 51,570 Kw = 36.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 333 tons

Complement:
 157 - 205

Cost:
 £1.295 million / $5.181 million

Distribution of weights at normal displacement:
 Armament: 27 tons, 1.2 %
 Machinery: 1,248 tons, 58.1 %
 Hull, fittings & equipment: 629 tons, 29.2 %
 Fuel, ammunition & stores: 246 tons, 11.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   483 lbs / 219 Kg = 9.3 x 4.7 " / 119 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.38
 Metacentric height 1.8 ft / 0.5 m
 Roll period: 10.8 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.37
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.486
 Length to Beam Ratio: 10.29 : 1
 'Natural speed' for length: 18.71 kts
 Power going to wave formation at top speed: 73 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  25.00 ft / 7.62 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (42 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 18.52 ft / 5.64 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 196.8 %
  - Above water (accommodation/working, high = better): 109.8 %
 Waterplane Area: 7,832 Square feet or 728 Square metres
 Displacement factor (Displacement / loading): 61 %
 Structure weight / hull surface area: 33 lbs/sq ft or 162 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 3.59
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

The It/DD/1931 design

Springsharp seems to have some pretty extreme limitations for small ships. To even reach 35 knots, rather than the 38 knots of the real Italian destroyers, I had to have an unrealistically high freeboard, too deep a draft, and too great a displacement. The only improvement of these ships over the It/DD/1927 design is a knot of speed. This is the Springsharp report:

It/DD/1931, Italy Destroyer laid down 1931 (Engine 1950)

Displacement:
 1,395 t light; 1,445 t standard; 1,600 t normal; 1,724 t full load

Dimensions: Length overall / water x beam x draught
 317.10 ft / 315.00 ft x 32.00 ft x 12.00 ft (normal load)
 96.65 m / 96.01 m x 9.75 m  x 3.66 m

Armament:
      4 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1931 Model
   Quick firing guns in deck mounts with hoists
   on centreline, evenly spread, 1 raised mount
   Aft Main mounts separated by engine room
      4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1931 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 214 lbs / 97 kg
 Shells per gun, main battery: 150
 6 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 53,744 shp / 40,093 Kw = 35.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 280 tons

Complement:
 126 - 164

Cost:
 £0.850 million / $3.399 million

Distribution of weights at normal displacement:
 Armament: 27 tons, 1.7 %
 Machinery: 882 tons, 55.1 %
 Hull, fittings & equipment: 486 tons, 30.4 %
 Fuel, ammunition & stores: 205 tons, 12.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   379 lbs / 172 Kg = 7.3 x 4.7 " / 119 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.34
 Metacentric height 1.5 ft / 0.5 m
 Roll period: 10.9 seconds
 Steadiness - As gun platform (Average = 50 %): 50 %
   - Recoil effect (Restricted arc if above 1.00): 0.48
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.463
 Length to Beam Ratio: 9.84 : 1
 'Natural speed' for length: 17.75 kts
 Power going to wave formation at top speed: 74 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  24.00 ft / 7.32 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (42 %):  22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break)
    - Quarterdeck (15 %): 14.00 ft / 4.27 m
    - Stern:  14.00 ft / 4.27 m
    - Average freeboard: 17.52 ft / 5.34 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 190.6 %
  - Above water (accommodation/working, high = better): 96.8 %
 Waterplane Area: 6,500 Square feet or 604 Square metres
 Displacement factor (Displacement / loading): 57 %
 Structure weight / hull surface area: 30 lbs/sq ft or 149 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.40
  - Longitudinal: 4.05
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

My It/DD/1927 design

This is my It/DD/1927 design. To make this work in Springsharp, the speed is less that I would have liked. The best I could do with Springsharp is 34 knots. The fuel load is less than the real ships from this period. For this power, somewhat over 40,000 SHP the ships should be able to reach 36 knots. The armament is 4-4.7in QF and 4-37mm AA guns, with 6-21in TT. The draft is too deep at 12 ft, but this helps make the design viable in Springsharp. This is the Springsharp report:

It/DD/1927, Italy Destroyer laid down 1927 (Engine 1945)

Displacement:
 1,114 t light; 1,158 t standard; 1,300 t normal; 1,414 t full load

Dimensions: Length overall / water x beam x draught
 311.54 ft / 310.00 ft x 30.00 ft x 12.00 ft (normal load)
 94.96 m / 94.49 m x 9.14 m  x 3.66 m

Armament:
      4 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1927 Model
   Quick firing guns in deck mounts with hoists
   on centreline, evenly spread, 1 raised mount
   Aft Main mounts separated by engine room
      4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1927 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 214 lbs / 97 kg
 Shells per gun, main battery: 150
 6 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 39,865 shp / 29,739 Kw = 34.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 256 tons

Complement:
 107 - 140

Cost:
 £0.567 million / $2.270 million

Distribution of weights at normal displacement:
 Armament: 27 tons, 2.1 %
 Machinery: 676 tons, 52.0 %
 Hull, fittings & equipment: 411 tons, 31.6 %
 Fuel, ammunition & stores: 186 tons, 14.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   327 lbs / 148 Kg = 6.3 x 4.7 " / 119 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.31
 Metacentric height 1.3 ft / 0.4 m
 Roll period: 10.9 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.57
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.408
 Length to Beam Ratio: 10.33 : 1
 'Natural speed' for length: 17.61 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  22.00 ft / 6.71 m
    - Forecastle (20 %): 20.00 ft / 6.10 m
    - Mid (42 %):  20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
    - Quarterdeck (15 %): 12.00 ft / 3.66 m
    - Stern:  12.00 ft / 3.66 m
    - Average freeboard: 15.52 ft / 4.73 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 183.5 %
  - Above water (accommodation/working, high = better): 83.6 %
 Waterplane Area: 5,751 Square feet or 534 Square metres
 Displacement factor (Displacement / loading): 58 %
 Structure weight / hull surface area: 30 lbs/sq ft or 146 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 3.37
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is cramped

My first attempt at an It/DL/1927 design

I struggled to allow this design to reach even 36 knots, not the 37 or 38 knots that I would have liked. I would be open to suggestions about how to achieve that, while still having acceptable strength and seakeeping. This is intended to be a super-destroyer with 5-5.1in QF guns and the fastest speed possible. With the current version of Springsharp, much of the problem with small, fast ships is that Springsharp overestimates how much power is required to reach a given speed. This is the Springsharp report:

It/DL/1927, Italy Destroyer Leader laid down 1927 (Engine 1950)

Displacement:
 2,164 t light; 2,250 t standard; 2,450 t normal; 2,610 t full load

Dimensions: Length overall / water x beam x draught
 385.75 ft / 384.00 ft x 36.00 ft x 13.00 ft (normal load)
 117.58 m / 117.04 m x 10.97 m  x 3.96 m

Armament:
      5 - 5.10" / 130 mm guns in single mounts, 66.33lbs / 30.08kg shells, 1927 Model
   Quick firing guns in deck mounts with hoists
   on centreline, evenly spread
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1927 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      12 - 1.46" / 37.0 mm guns (6x2 guns), 1.55lbs / 0.70kg shells, 1927 Model
   Breech loading guns in deck mounts 
   on side, evenly spread, all raised mounts
 Weight of broadside 414 lbs / 188 kg
 Shells per gun, main battery: 150
 8 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 69,926 shp / 52,165 Kw = 36.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 359 tons

Complement:
 173 - 226

Cost:
 £1.114 million / $4.454 million

Distribution of weights at normal displacement:
 Armament: 52 tons, 2.1 %
 Machinery: 1,336 tons, 54.5 %
 Hull, fittings & equipment: 727 tons, 29.7 %
 Fuel, ammunition & stores: 286 tons, 11.7 %
 Miscellaneous weights: 50 tons, 2.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   549 lbs / 249 Kg = 8.3 x 5.1 " / 130 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 1.7 ft / 0.5 m
 Roll period: 11.5 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.59
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.477
 Length to Beam Ratio: 10.67 : 1
 'Natural speed' for length: 19.60 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 55
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  25.00 ft / 7.62 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (36 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 18.04 ft / 5.50 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 194.3 %
  - Above water (accommodation/working, high = better): 101.4 %
 Waterplane Area: 9,024 Square feet or 838 Square metres
 Displacement factor (Displacement / loading): 64 %
 Structure weight / hull surface area: 36 lbs/sq ft or 177 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.45
  - Longitudinal: 2.53
  - Overall: 0.53
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

My attempt at a big, fast Italian battleship: the It/BB/1937

The It/BB/1937 is my attempt at a big, new Italian battleship with the obligatory 9-15in gun main armament. The speed is 30 knots, although the armour basis is just 13in. The secondary and AA armament is to my own specification. This is the Springsharp report:

It/BB/1937, Italy Battleship laid down 1937 (Engine 1941)

Displacement:
    40,876 t light; 42,629 t standard; 44,300 t normal; 45,637 t full load

Dimensions: Length overall / water x beam x draught
    773.47 ft / 770.00 ft x 105.00 ft x 32.00 ft (normal load)
    235.75 m / 234.70 m x 32.00 m  x 9.75 m

Armament:
      9 - 15.00" / 381 mm guns (4 mounts), 1,687.50lbs / 765.44kg shells, 1937 Model
      Breech loading guns in turrets (on barbettes)
      on centreline ends, evenly spread, 3 raised guns - superfiring
      16 - 5.30" / 135 mm guns (8x2 guns), 74.44lbs / 33.76kg shells, 1937 Model
      Dual purpose guns in turrets (on barbettes)
      on side, all amidships, 4 raised mounts - superfiring
      16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1937 Model
      Anti-aircraft guns in turrets (on barbettes)
      on side, all amidships
      36 - 1.46" / 37.0 mm guns (16 mounts), 1.55lbs / 0.70kg shells, 1937 Model
      Breech loading guns in deck mounts
      on side, evenly spread, all raised mounts
    Weight of broadside 16,946 lbs / 7,687 kg
    Shells per gun, main battery: 90

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    13.0" / 330 mm    430.00 ft / 131.06 m    8.00 ft / 2.44 m
    Ends:    Unarmoured
    Upper:    10.0" / 254 mm    430.00 ft / 131.06 m    8.00 ft / 2.44 m
      Main Belt covers 86 % of normal length

   - Torpedo Bulkhead:
        4.00" / 102 mm    430.00 ft / 131.06 m    31.00 ft / 9.45 m

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    14.0" / 356 mm    10.0" / 254 mm        13.0" / 330 mm
    2nd:    5.00" / 127 mm    5.00" / 127 mm        5.00" / 127 mm
    3rd:    1.00" / 25 mm    1.00" / 25 mm        1.00" / 25 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 12.00" / 305 mm

Machinery:
    Oil fired boilers, steam turbines,
    Geared drive, 4 shafts, 160,456 shp / 119,700 Kw = 30.00 kts
    Range 5,400nm at 15.00 kts
    Bunker at max displacement = 3,008 tons

Complement:
    1,526 - 1,984

Cost:
    £20.747 million / $82.989 million

Distribution of weights at normal displacement:
    Armament: 2,118 tons, 4.8 %
    Armour: 17,123 tons, 38.7 %
       - Belts: 3,521 tons, 7.9 %
       - Torpedo bulkhead: 1,973 tons, 4.5 %
       - Armament: 4,746 tons, 10.7 %
       - Armour Deck: 6,559 tons, 14.8 %
       - Conning Tower: 324 tons, 0.7 %
    Machinery: 4,240 tons, 9.6 %
    Hull, fittings & equipment: 17,395 tons, 39.3 %
    Fuel, ammunition & stores: 3,424 tons, 7.7 %
    Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      67,467 lbs / 30,603 Kg = 40.0 x 15.0 " / 381 mm shells or 11.3 torpedoes
    Stability (Unstable if below 1.00): 1.03
    Metacentric height 5.8 ft / 1.8 m
    Roll period: 18.4 seconds
    Steadiness    - As gun platform (Average = 50 %): 58 %
            - Recoil effect (Restricted arc if above 1.00): 0.78
    Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
    Hull has rise forward of midbreak
    Block coefficient: 0.599
    Length to Beam Ratio: 7.33 : 1
    'Natural speed' for length: 27.75 kts
    Power going to wave formation at top speed: 54 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 6.00 degrees
    Stern overhang: -2.00 ft / -0.61 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        33.00 ft / 10.06 m
       - Forecastle (20 %):    28.00 ft / 8.53 m
       - Mid (74 %):        28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
       - Quarterdeck (15 %):    20.00 ft / 6.10 m
       - Stern:        20.00 ft / 6.10 m
       - Average freeboard:    26.32 ft / 8.02 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 83.2 %
        - Above water (accommodation/working, high = better): 196.5 %
    Waterplane Area: 59,093 Square feet or 5,490 Square metres
    Displacement factor (Displacement / loading): 104 %
    Structure weight / hull surface area: 205 lbs/sq ft or 1,001 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.96
        - Longitudinal: 1.46
        - Overall: 1.00
    Hull space for machinery, storage, compartmentation is excellent
    Room for accommodation and workspaces is excellent

My later model small, fast battleship: the It/BB/1933

The It/BB/1933 design has the usual 10-12.6in guns in the main armament, but it also has 4-triple 5.3in DP turrets and 16-4in AA guns in twin turrets. The LAA armament is now 32-37mm AA guns in twin mounts. The speed is still 28 knots, but the range is now 5,400nm at 15 knots. The side armour is still 12in, but the deck armour is now 5in and the torpedo bulkhead is 4in. This is the Springsharp report:

It/BB/1933, Italy Battleship laid down 1933 (Engine 1941)

Displacement:
 30,353 t light; 31,602 t standard; 33,000 t normal; 34,118 t full load

Dimensions: Length overall / water x beam x draught
 686.45 ft / 684.00 ft x 102.00 ft x 27.00 ft (normal load)
 209.23 m / 208.48 m x 31.09 m  x 8.23 m

Armament:
      10 - 12.60" / 320 mm guns (4 mounts), 1,000.19lbs / 453.68kg shells, 1933 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 5.30" / 135 mm guns (4x3 guns), 74.44lbs / 33.76kg shells, 1933 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships, 2 raised mounts - superfiring
      16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1933 Model
   Anti-aircraft guns in turrets (on barbettes)
   on side, all amidships
      32 - 1.46" / 37.0 mm guns (16x2 guns), 1.55lbs / 0.70kg shells, 1933 Model
   Breech loading guns in deck mounts 
   on side, evenly spread, all raised mounts
 Weight of broadside 11,457 lbs / 5,197 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 380.00 ft / 115.82 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 380.00 ft / 115.82 m 8.00 ft / 2.44 m
   Main Belt covers 85 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 380.00 ft / 115.82 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm
 3rd: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

   - Armour deck: 5.00" / 127 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 109,006 shp / 81,319 Kw = 28.00 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 2,516 tons

Complement:
 1,223 - 1,591

Cost:
 £12.615 million / $50.461 million

Distribution of weights at normal displacement:
 Armament: 1,432 tons, 4.3 %
 Armour: 13,008 tons, 39.4 %
    - Belts: 2,879 tons, 8.7 %
    - Torpedo bulkhead: 1,518 tons, 4.6 %
    - Armament: 3,567 tons, 10.8 %
    - Armour Deck: 4,778 tons, 14.5 %
    - Conning Tower: 266 tons, 0.8 %
 Machinery: 2,881 tons, 8.7 %
 Hull, fittings & equipment: 13,032 tons, 39.5 %
 Fuel, ammunition & stores: 2,647 tons, 8.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   57,997 lbs / 26,307 Kg = 58.0 x 12.6 " / 320 mm shells or 10.9 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 6.1 ft / 1.9 m
 Roll period: 17.3 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.53
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.613
 Length to Beam Ratio: 6.71 : 1
 'Natural speed' for length: 26.15 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  28.00 ft / 8.53 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (67 %):  26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 23.52 ft / 7.17 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 76.4 %
  - Above water (accommodation/working, high = better): 191.4 %
 Waterplane Area: 51,656 Square feet or 4,799 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 185 lbs/sq ft or 902 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.42
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

The It/BB/1927 design: obviously inspired by the Cavour

As you can tell, the It/BB/1927 design is inspired by the Cavour. My design relies upon very lightweight machinery to be viable. I use the same 10-12.6in guns. The secondary armament consists of 12-4.7in DP and 24-37mm AA guns. The armour basis is 12in with a 4in deck. This is the Springsharp report:

It/BB/1927, Italy Battleship laid down 1927 (Engine 1937)

Displacement:
 27,857 t light; 29,002 t standard; 30,200 t normal; 31,159 t full load

Dimensions: Length overall / water x beam x draught
 672.45 ft / 670.00 ft x 102.00 ft x 27.00 ft (normal load)
 204.96 m / 204.22 m x 31.09 m  x 8.23 m

Armament:
      10 - 12.60" / 320 mm guns (4 mounts), 1,000.19lbs / 453.68kg shells, 1927 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 4.70" / 119 mm guns (6x2 guns), 51.91lbs / 23.55kg shells, 1927 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships
      24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1927 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 10,662 lbs / 4,836 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 380.00 ft / 115.82 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 380.00 ft / 115.82 m 8.00 ft / 2.44 m
   Main Belt covers 87 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 380.00 ft / 115.82 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 102,385 shp / 76,379 Kw = 28.00 kts
 Range 4,700nm at 15.00 kts
 Bunker at max displacement = 2,157 tons

Complement:
 1,145 - 1,489

Cost:
 £9.061 million / $36.244 million

Distribution of weights at normal displacement:
 Armament: 1,333 tons, 4.4 %
 Armour: 11,305 tons, 37.4 %
    - Belts: 2,869 tons, 9.5 %
    - Torpedo bulkhead: 1,139 tons, 3.8 %
    - Armament: 3,440 tons, 11.4 %
    - Armour Deck: 3,606 tons, 11.9 %
    - Conning Tower: 251 tons, 0.8 %
 Machinery: 2,838 tons, 9.4 %
 Hull, fittings & equipment: 12,381 tons, 41.0 %
 Fuel, ammunition & stores: 2,343 tons, 7.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   51,519 lbs / 23,369 Kg = 51.5 x 12.6 " / 320 mm shells or 9.3 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 6.0 ft / 1.8 m
 Roll period: 17.4 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.51
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.573
 Length to Beam Ratio: 6.57 : 1
 'Natural speed' for length: 25.88 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  28.00 ft / 8.53 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (67 %):  26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 23.52 ft / 7.17 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 79.7 %
  - Above water (accommodation/working, high = better): 192.8 %
 Waterplane Area: 48,727 Square feet or 4,527 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 185 lbs/sq ft or 902 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.52
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

A bigger, faster, well-protected Italian cruiser: the It/CA/1941

The It/CA/1941 design is quite a bit larger than the It/CA/1937 design and can make 35 knots. It as the same armament and protection as the earlier design, but is longer and has a greater tonnage. The Standard displacement is 16,201 tons. This is a considerably better ship than what the Italians actually built. This is the Springsharp report:

It/CA/1941, Italy Heavy Cruiser laid down 1941 (Engine 1945)

Displacement:
 15,686 t light; 16,201 t standard; 17,000 t normal; 17,639 t full load

Dimensions: Length overall / water x beam x draught
 674.71 ft / 672.00 ft x 69.00 ft x 21.00 ft (normal load)
 205.65 m / 204.83 m x 21.03 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1941 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.70" / 119 mm guns (4x2 guns), 51.91lbs / 23.55kg shells, 1941 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      28 - 1.46" / 37.0 mm guns (14x2 guns), 1.55lbs / 0.70kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,507 lbs / 1,137 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 440.00 ft / 134.11 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 101 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 440.00 ft / 134.11 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 170,080 shp / 126,880 Kw = 35.00 kts
 Range 4,800nm at 15.00 kts
 Bunker at max displacement = 1,439 tons

Complement:
 743 - 967

Cost:
 £8.738 million / $34.952 million

Distribution of weights at normal displacement:
 Armament: 313 tons, 1.8 %
 Armour: 4,477 tons, 26.3 %
    - Belts: 1,473 tons, 8.7 %
    - Torpedo bulkhead: 342 tons, 2.0 %
    - Armament: 689 tons, 4.1 %
    - Armour Deck: 1,902 tons, 11.2 %
    - Conning Tower: 71 tons, 0.4 %
 Machinery: 4,295 tons, 25.3 %
 Hull, fittings & equipment: 6,600 tons, 38.8 %
 Fuel, ammunition & stores: 1,314 tons, 7.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   22,983 lbs / 10,425 Kg = 89.8 x 8.0 " / 203 mm shells or 2.7 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 3.8 ft / 1.2 m
 Roll period: 14.9 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.611
 Length to Beam Ratio: 9.74 : 1
 'Natural speed' for length: 25.92 kts
 Power going to wave formation at top speed: 61 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (50 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 25.16 ft / 7.67 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 135.8 %
  - Above water (accommodation/working, high = better): 191.1 %
 Waterplane Area: 34,264 Square feet or 3,183 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 120 lbs/sq ft or 584 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.50
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The It/CA/1937 heavy cruiser

My design for the It/CA/1937 is a better protected ship, in that the deck armour is 3in, in stead of 2in. The belt is slightly longer, as well. The heavy AA armament is 8-4.7in AA guns and the light AA armament is 28-37mm AA guns in twin mounts. The main armament is unchanged at 8-8in guns and the torpedo armament is still 8-21in TT in quad mounts on the deck. The speed is 34 knots and the range is slightly greater at 4,800nm at 15 knots. This is the Springsharp report:

It/CA/1937 Heavier Armour Version, Italy Heavy Cruiser laid down 1937 (Engine 1945)

Displacement:
 14,644 t light; 15,137 t standard; 15,900 t normal; 16,511 t full load

Dimensions: Length overall / water x beam x draught
 655.57 ft / 654.00 ft x 68.00 ft x 21.00 ft (normal load)
 199.82 m / 199.34 m x 20.73 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1937 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.70" / 119 mm guns (4x2 guns), 51.91lbs / 23.55kg shells, 1937 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      28 - 1.46" / 37.0 mm guns (14x2 guns), 1.55lbs / 0.70kg shells, 1937 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,507 lbs / 1,137 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 440.00 ft / 134.11 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 104 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 440.00 ft / 134.11 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 145,685 shp / 108,681 Kw = 34.00 kts
 Range 4,800nm at 15.00 kts
 Bunker at max displacement = 1,374 tons

Complement:
 707 - 920

Cost:
 £7.041 million / $28.162 million

Distribution of weights at normal displacement:
 Armament: 313 tons, 2.0 %
 Armour: 4,366 tons, 27.5 %
    - Belts: 1,468 tons, 9.2 %
    - Torpedo bulkhead: 342 tons, 2.2 %
    - Armament: 689 tons, 4.3 %
    - Armour Deck: 1,798 tons, 11.3 %
    - Conning Tower: 68 tons, 0.4 %
 Machinery: 3,679 tons, 23.1 %
 Hull, fittings & equipment: 6,286 tons, 39.5 %
 Fuel, ammunition & stores: 1,256 tons, 7.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   22,797 lbs / 10,341 Kg = 89.1 x 8.0 " / 203 mm shells or 2.9 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 15.1 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.52
 Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.596
 Length to Beam Ratio: 9.62 : 1
 'Natural speed' for length: 25.57 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (50 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 25.08 ft / 7.64 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 128.3 %
  - Above water (accommodation/working, high = better): 188.8 %
 Waterplane Area: 32,401 Square feet or 3,010 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 119 lbs/sq ft or 580 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.63
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The It/CA/1931 Heavy Armour Version

The It/CA/1931 Heavy Armour has much better protection than the Fast Version. The side armour is 5in and is 16ft high. The speed is less, at 34 knots. The length is slightly less. This is the Springsharp report:

It/CA/1931 Heavier Armour Version, Italy Heavy Cruiser laid down 1931 (Engine 1945)

Displacement:
 13,465 t light; 13,919 t standard; 14,598 t normal; 15,142 t full load

Dimensions: Length overall / water x beam x draught
 646.57 ft / 645.00 ft x 67.00 ft x 21.00 ft (normal load)
 197.08 m / 196.60 m x 20.42 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1931 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1931 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1931 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,341 lbs / 1,062 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 420.00 ft / 128.02 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 420.00 ft / 128.02 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 136,720 shp / 101,993 Kw = 34.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,223 tons

Complement:
 663 - 863

Cost:
 £5.238 million / $20.953 million

Distribution of weights at normal displacement:
 Armament: 293 tons, 2.0 %
 Armour: 3,615 tons, 24.8 %
    - Belts: 1,406 tons, 9.6 %
    - Torpedo bulkhead: 326 tons, 2.2 %
    - Armament: 688 tons, 4.7 %
    - Armour Deck: 1,130 tons, 7.7 %
    - Conning Tower: 64 tons, 0.4 %
 Machinery: 3,453 tons, 23.7 %
 Hull, fittings & equipment: 6,105 tons, 41.8 %
 Fuel, ammunition & stores: 1,133 tons, 7.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   20,614 lbs / 9,350 Kg = 80.5 x 8.0 " / 203 mm shells or 2.6 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 15.4 seconds
 Steadiness - As gun platform (Average = 50 %): 59 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.563
 Length to Beam Ratio: 9.63 : 1
 'Natural speed' for length: 25.40 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (50 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 25.08 ft / 7.64 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 131.8 %
  - Above water (accommodation/working, high = better): 188.9 %
 Waterplane Area: 30,529 Square feet or 2,836 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 120 lbs/sq ft or 585 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.78
  - Overall: 1.02
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The It/CA/1931 Fast Version is a modest improvement on the 1929 version

The main improvements in the It/CA/1931 "Fast Version" over the 1929 design is a knot more speed (36 knots) and a somewhat better AA armament. The main armament is still 8-8in guns, but there are now 8-4in and 24-37mm AA guns. The belt is 3in and the deck is 2in. This is the Springsharp report:

It/CA/1931 Fast Version, Italy Heavy Cruiser laid down 1931 (Engine 1945)

Displacement:
 13,473 t light; 13,927 t standard; 14,607 t normal; 15,151 t full load

Dimensions: Length overall / water x beam x draught
 651.57 ft / 650.00 ft x 67.00 ft x 21.00 ft (normal load)
 198.60 m / 198.12 m x 20.42 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1931 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1931 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1931 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,341 lbs / 1,062 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 420.00 ft / 128.02 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 420.00 ft / 128.02 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 172,154 shp / 128,427 Kw = 36.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,224 tons

Complement:
 663 - 863

Cost:
 £5.786 million / $23.144 million

Distribution of weights at normal displacement:
 Armament: 293 tons, 2.0 %
 Armour: 2,717 tons, 18.6 %
    - Belts: 633 tons, 4.3 %
    - Torpedo bulkhead: 326 tons, 2.2 %
    - Armament: 572 tons, 3.9 %
    - Armour Deck: 1,134 tons, 7.8 %
    - Conning Tower: 51 tons, 0.4 %
 Machinery: 4,347 tons, 29.8 %
 Hull, fittings & equipment: 6,116 tons, 41.9 %
 Fuel, ammunition & stores: 1,134 tons, 7.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,551 lbs / 7,054 Kg = 60.7 x 8.0 " / 203 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.559
 Length to Beam Ratio: 9.70 : 1
 'Natural speed' for length: 25.50 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (50 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 25.08 ft / 7.64 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 159.6 %
  - Above water (accommodation/working, high = better): 189.9 %
 Waterplane Area: 30,651 Square feet or 2,848 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 119 lbs/sq ft or 583 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.74
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The main improvements in the It/CA/1931 "Fast Version" over the 1929 design is a knot more speed (36 knots) and a somewhat better AA armament. The main armament is still 8-8in guns, but there are now 8-4in and 24-37mm AA guns. The belt is 3in and the deck is 2in. This is the Springsharp report:

It/CA/1931 Fast Version, Italy Heavy Cruiser laid down 1931 (Engine 1945)

Displacement:
 13,473 t light; 13,927 t standard; 14,607 t normal; 15,151 t full load

Dimensions: Length overall / water x beam x draught
 651.57 ft / 650.00 ft x 67.00 ft x 21.00 ft (normal load)
 198.60 m / 198.12 m x 20.42 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1931 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1931 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1931 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,341 lbs / 1,062 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 420.00 ft / 128.02 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 420.00 ft / 128.02 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 172,154 shp / 128,427 Kw = 36.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,224 tons

Complement:
 663 - 863

Cost:
 £5.786 million / $23.144 million

Distribution of weights at normal displacement:
 Armament: 293 tons, 2.0 %
 Armour: 2,717 tons, 18.6 %
    - Belts: 633 tons, 4.3 %
    - Torpedo bulkhead: 326 tons, 2.2 %
    - Armament: 572 tons, 3.9 %
    - Armour Deck: 1,134 tons, 7.8 %
    - Conning Tower: 51 tons, 0.4 %
 Machinery: 4,347 tons, 29.8 %
 Hull, fittings & equipment: 6,116 tons, 41.9 %
 Fuel, ammunition & stores: 1,134 tons, 7.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,551 lbs / 7,054 Kg = 60.7 x 8.0 " / 203 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.559
 Length to Beam Ratio: 9.70 : 1
 'Natural speed' for length: 25.50 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (50 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 25.08 ft / 7.64 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 159.6 %
  - Above water (accommodation/working, high = better): 189.9 %
 Waterplane Area: 30,651 Square feet or 2,848 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 119 lbs/sq ft or 583 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.74
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The fast version of the It/CA/1931 design is a modest improvement

The main improvements in the It/CA/1931 "Fast Version" over the 1929 design is a knot more speed (36 knots) and a somewhat better AA armament. The main armament is still 8-8in guns, but there are now 8-4in and 24-37mm AA guns. The belt is 3in and the deck is 2in. This is the Springsharp report:

It/CA/1931, Italy Heavy Cruiser laid down 1931 (Engine 1945)

Displacement:
 13,466 t light; 13,920 t standard; 14,600 t normal; 15,144 t full load

Dimensions: Length overall / water x beam x draught
 651.57 ft / 650.00 ft x 67.00 ft x 21.00 ft (normal load)
 198.60 m / 198.12 m x 20.42 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1931 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1931 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1931 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,341 lbs / 1,062 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 420.00 ft / 128.02 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 420.00 ft / 128.02 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 172,081 shp / 128,373 Kw = 36.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,223 tons

Complement:
 663 - 863

Cost:
 £5.784 million / $23.136 million

Distribution of weights at normal displacement:
 Armament: 293 tons, 2.0 %
 Armour: 2,717 tons, 18.6 %
    - Belts: 633 tons, 4.3 %
    - Torpedo bulkhead: 326 tons, 2.2 %
    - Armament: 572 tons, 3.9 %
    - Armour Deck: 1,134 tons, 7.8 %
    - Conning Tower: 51 tons, 0.4 %
 Machinery: 4,345 tons, 29.8 %
 Hull, fittings & equipment: 6,111 tons, 41.9 %
 Fuel, ammunition & stores: 1,134 tons, 7.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,543 lbs / 7,050 Kg = 60.7 x 8.0 " / 203 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.559
 Length to Beam Ratio: 9.70 : 1
 'Natural speed' for length: 25.50 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (50 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 25.08 ft / 7.64 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 159.6 %
  - Above water (accommodation/working, high = better): 189.9 %
 Waterplane Area: 30,643 Square feet or 2,847 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 119 lbs/sq ft or 582 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.74
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

My first attempt at an Italian heavy cruiser: It/CA/1929

This design is somewhat similar to the real thing. I could not make a flush-decked It/CA/1929 work, so I went with a raised forecastle. It certainly only is possible with extremely lightweight machinery (39.6 SHP/ton). This ship has 8-8in guns, 3in armour and a 35 knot speed. I am pleased that we could achieve this much. This is the Springsharp report:

It/CA/1929, Italy Heavy Cruiser laid down 1929 (Engine 1945)

Displacement:
 11,861 t light; 12,274 t standard; 12,900 t normal; 13,401 t full load

Dimensions: Length overall / water x beam x draught
 646.47 ft / 645.00 ft x 67.00 ft x 21.00 ft (normal load)
 197.04 m / 196.60 m x 20.42 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1929 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      6 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1929 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      16 - 1.46" / 37.0 mm guns (8x2 guns), 1.55lbs / 0.70kg shells, 1929 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,265 lbs / 1,027 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 410.00 ft / 124.97 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 98 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 410.00 ft / 124.97 m 19.00 ft / 5.79 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 137,919 shp / 102,887 Kw = 35.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,126 tons

Complement:
 604 - 786

Cost:
 £4.562 million / $18.248 million

Distribution of weights at normal displacement:
 Armament: 283 tons, 2.2 %
 Armour: 2,560 tons, 19.8 %
    - Belts: 618 tons, 4.8 %
    - Torpedo bulkhead: 288 tons, 2.2 %
    - Armament: 543 tons, 4.2 %
    - Armour Deck: 1,063 tons, 8.2 %
    - Conning Tower: 47 tons, 0.4 %
 Machinery: 3,483 tons, 27.0 %
 Hull, fittings & equipment: 5,535 tons, 42.9 %
 Fuel, ammunition & stores: 1,039 tons, 8.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,543 lbs / 7,050 Kg = 60.7 x 8.0 " / 203 mm shells or 2.1 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.498
 Length to Beam Ratio: 9.63 : 1
 'Natural speed' for length: 25.40 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  28.00 ft / 8.53 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (50 %):  27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 23.08 ft / 7.03 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 149.0 %
  - Above water (accommodation/working, high = better): 179.4 %
 Waterplane Area: 28,728 Square feet or 2,669 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 119 lbs/sq ft or 582 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.50
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

My 1933 Italian light cruiser design

My 1933 Italian light cruiser design is better-protected than the real ships. Mine has a 2in deck, for one thing, and a 1in torpedo bulkhead. The main belt is 4in thick, although it is just 12ft high, just protecting the waterline. I increased the speed to 36 knots, so the ship is huge, at 11,306 tons Standard. The armament is unchanged from my 1931 design. This is the Springsharp report:

It/CL/1933, Italy Light Cruiser laid down 1933 (Engine 1945)

Displacement:
 10,986 t light; 11,306 t standard; 11,900 t normal; 12,375 t full load

Dimensions: Length overall / water x beam x draught
 624.05 ft / 618.00 ft x 59.00 ft x 21.00 ft (normal load)
 190.21 m / 188.37 m x 17.98 m  x 6.40 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1933 Model
   Quick firing guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1933 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all aft
      16 - 1.46" / 37.0 mm guns (8x2 guns), 1.55lbs / 0.70kg shells, 1933 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, all raised mounts
 Weight of broadside 1,145 lbs / 519 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 445.00 ft / 135.64 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 111 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 445.00 ft / 135.64 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.50" / 89 mm 2.50" / 64 mm  3.00" / 76 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 151,801 shp / 113,243 Kw = 36.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,070 tons

Complement:
 569 - 740

Cost:
 £4.923 million / $19.691 million

Distribution of weights at normal displacement:
 Armament: 143 tons, 1.2 %
 Armour: 2,505 tons, 21.0 %
    - Belts: 874 tons, 7.3 %
    - Torpedo bulkhead: 346 tons, 2.9 %
    - Armament: 304 tons, 2.6 %
    - Armour Deck: 936 tons, 7.9 %
    - Conning Tower: 45 tons, 0.4 %
 Machinery: 3,833 tons, 32.2 %
 Hull, fittings & equipment: 4,505 tons, 37.9 %
 Fuel, ammunition & stores: 914 tons, 7.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   11,624 lbs / 5,273 Kg = 107.6 x 6.0 " / 152 mm shells or 1.6 torpedoes
 Stability (Unstable if below 1.00): 1.20
 Metacentric height 3.2 ft / 1.0 m
 Roll period: 13.9 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.32
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.544
 Length to Beam Ratio: 10.47 : 1
 'Natural speed' for length: 24.86 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 6.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  29.00 ft / 8.84 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (33 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 22.72 ft / 6.93 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 172.2 %
  - Above water (accommodation/working, high = better): 155.3 %
 Waterplane Area: 25,303 Square feet or 2,351 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 101 lbs/sq ft or 494 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.68
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent