The GB/DD/1918 design

I had thought that the machinery is too heavy for the power produced, but I was reluctant to make the date any later than 10 years more than the laid-down date. The machinery is 50 SHP/ton, so it is not that bad. I also wondered if the problem was that power to reach 35 knots is greater than would really be needed. I looked at some example ships. The A-class ships had 505 ton machinery that produced 34,000 SHP. The improvements in the GB/DD/1918 design include a 35 knot speed, a 4,200nm range at 12 knots, 8-21in TT, and 4-2pdr AA. This is the Springsharp report:

GB/DD/1918, Great Britain Destroyer laid down 1918 (Engine 1928)

Displacement:
 1,199 t light; 1,251 t standard; 1,350 t normal; 1,429 t full load

Dimensions: Length overall / water x beam x draught
 326.21 ft / 325.00 ft x 31.00 ft x 12.00 ft (normal load)
 99.43 m / 99.06 m x 9.45 m  x 3.66 m

Armament:
      4 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1918 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 1.57" / 40.0 mm guns (1x4 guns), 2.00lbs / 0.91kg shells, 1918 Model
   Anti-aircraft guns in deck mount 
   on side amidships, all raised guns
 Weight of broadside 216 lbs / 98 kg
 Shells per gun, main battery: 200
 8 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 36,622 shp / 27,320 Kw = 35.00 kts
 Range 4,200nm at 12.00 kts
 Bunker at max displacement = 178 tons

Complement:
 110 - 144

Cost:
 £0.333 million / $1.332 million

Distribution of weights at normal displacement:
 Armament: 27 tons, 2.0 %
 Machinery: 728 tons, 53.9 %
 Hull, fittings & equipment: 444 tons, 32.9 %
 Fuel, ammunition & stores: 151 tons, 11.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   333 lbs / 151 Kg = 6.4 x 4.7 " / 119 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.28
 Metacentric height 1.3 ft / 0.4 m
 Roll period: 11.2 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.56
 Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
 Hull has rise forward of midbreak
   and transom stern
 Block coefficient: 0.391
 Length to Beam Ratio: 10.48 : 1
 'Natural speed' for length: 20.80 kts
 Power going to wave formation at top speed: 70 %
 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:  23.00 ft / 7.01 m
    - Forecastle (20 %): 21.00 ft / 6.40 m
    - Mid (35 %):  21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break)
    - Quarterdeck (15 %): 13.00 ft / 3.96 m
    - Stern:  13.00 ft / 3.96 m
    - Average freeboard: 15.96 ft / 4.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 189.8 %
  - Above water (accommodation/working, high = better): 74.6 %
 Waterplane Area: 6,404 Square feet or 595 Square metres
 Displacement factor (Displacement / loading): 54 %
 Structure weight / hull surface area: 30 lbs/sq ft or 147 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.43
  - Longitudinal: 3.25
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is cramped

My GB/DD/1916 design

My GB/DD/1916 design is at least more aggressive, in that the destroyer has 4-4.7in QF guns, with two superfiring. I moderately increased the range (to 3,750nm at 12 knots), as well. This is the Springsharp report:

GB/DD/1916, Great Britain Destroyer laid down 1916 (Engine 1920)

Displacement:
 1,109 t light; 1,159 t standard; 1,250 t normal; 1,323 t full load

Dimensions: Length overall / water x beam x draught
 306.21 ft / 305.00 ft x 31.00 ft x 12.00 ft (normal load)
 93.33 m / 92.96 m x 9.45 m  x 3.66 m

Armament:
      4 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1916 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 2.24" / 57.0 mm guns (1x2 guns), 5.65lbs / 2.56kg shells, 1916 Model
   Anti-aircraft guns in deck mount 
   on side amidships
 Weight of broadside 219 lbs / 99 kg
 Shells per gun, main battery: 200
 4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 31,903 shp / 23,800 Kw = 34.00 kts
 Range 3,750nm at 12.00 kts
 Bunker at max displacement = 164 tons

Complement:
 104 - 136

Cost:
 £0.255 million / $1.022 million

Distribution of weights at normal displacement:
 Armament: 27 tons, 2.2 %
 Machinery: 673 tons, 53.9 %
 Hull, fittings & equipment: 408 tons, 32.7 %
 Fuel, ammunition & stores: 141 tons, 11.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   307 lbs / 139 Kg = 5.9 x 4.7 " / 119 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 1.4 ft / 0.4 m
 Roll period: 11.1 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.57
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has rise forward of midbreak
   and transom stern
 Block coefficient: 0.386
 Length to Beam Ratio: 9.84 : 1
 'Natural speed' for length: 20.28 kts
 Power going to wave formation at top speed: 70 %
 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:  23.00 ft / 7.01 m
    - Forecastle (20 %): 21.00 ft / 6.40 m
    - Mid (35 %):  21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break)
    - Quarterdeck (15 %): 13.00 ft / 3.96 m
    - Stern:  13.00 ft / 3.96 m
    - Average freeboard: 15.96 ft / 4.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 191.1 %
  - Above water (accommodation/working, high = better): 115.5 %
 Waterplane Area: 5,995 Square feet or 557 Square metres
 Displacement factor (Displacement / loading): 51 %
 Structure weight / hull surface area: 30 lbs/sq ft or 144 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 3.63
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

A new design series starting with the GB/DD/1914

One of my main concerns about Springsharp is that destroyer machinery is too heavy. I believe that this will eventually be corrected, perhaps in the next version. I thought that the next design series should study British destroyers. This is my concept for a 1914 British design: the GB/DD/1914. I wanted 1,000 tons , or so, at least 34 knots, and a 3,500nm range. The armament is not particularly interesting, but reasonable at 4-4in QF, 1-6pdr AA, and 4-21in TT. One gun is superfiring. This is the Springsharp report:

GB/DD/1914, Great Britain Destroyer laid down 1914 (Engine 1918)

Displacement:
    923 t light; 959 t standard; 1,040 t normal; 1,105 t full load

Dimensions: Length overall / water x beam x draught
    280.00 ft / 280.00 ft x 29.00 ft x 12.00 ft (normal load)
    85.34 m / 85.34 m x 8.84 m  x 3.66 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1914 Model
      Quick firing guns in deck mounts with hoists
      on centreline ends, evenly spread, 1 raised mount
      1 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1914 Model
      Anti-aircraft gun in deck mount
      on side amidships
    Weight of broadside 134 lbs / 61 kg
    Shells per gun, main battery: 200
    4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
    Oil fired boilers, steam turbines,
    Direct drive, 2 shafts, 29,517 shp / 22,020 Kw = 34.00 kts
    Range 3,500nm at 12.00 kts
    Bunker at max displacement = 146 tons

Complement:
    91 - 119

Cost:
    £0.161 million / $0.646 million

Distribution of weights at normal displacement:
    Armament: 17 tons, 1.6 %
    Machinery: 575 tons, 55.3 %
    Hull, fittings & equipment: 331 tons, 31.8 %
    Fuel, ammunition & stores: 117 tons, 11.3 %
    Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      257 lbs / 117 Kg = 8.0 x 4.0 " / 102 mm shells or 0.2 torpedoes
    Stability (Unstable if below 1.00): 1.35
    Metacentric height 1.3 ft / 0.4 m
    Roll period: 10.6 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
      and transom stern
    Block coefficient: 0.374
    Length to Beam Ratio: 9.66 : 1
    'Natural speed' for length: 19.50 kts
    Power going to wave formation at top speed: 72 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    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:        22.00 ft / 6.71 m
       - Forecastle (20 %):    20.00 ft / 6.10 m
       - Mid (35 %):        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:    14.96 ft / 4.56 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 191.1 %
        - Above water (accommodation/working, high = better): 98.1 %
    Waterplane Area: 5,125 Square feet or 476 Square metres
    Displacement factor (Displacement / loading): 46 %
    Structure weight / hull surface area: 28 lbs/sq ft or 135 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.42
        - Longitudinal: 3.99
        - Overall: 0.53
    Hull space for machinery, storage, compartmentation is cramped
    Room for accommodation and workspaces is adequate

The final step in this design series: GB/CA/1940

The final step in this design series seemed to demand using 9.2in BLR. For a ship of this size, over 23,000 tons normal, 8in guns seemed to be too small. I suspect that the last design had some shortcomings, brought on by typos. This one is a super-ship, with a speed of 36 knots, a range of 8,500nm at 15 knots and a 5in armour basis. This is the Springsharp report:

GB/CA/1940, Great Britain Heavy Cruiser laid down 1940

Displacement:
 20,903 t light; 21,760 t standard; 23,400 t normal; 24,712 t full load

Dimensions: Length overall / water x beam x draught
 738.00 ft / 738.00 ft x 71.00 ft x 26.50 ft (normal load)
 224.94 m / 224.94 m x 21.64 m  x 8.08 m

Armament:
      9 - 9.20" / 234 mm guns (3x3 guns), 389.34lbs / 176.60kg shells, 1940 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (8x2 guns), 51.91lbs / 23.55kg shells, 1940 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships
      48 - 1.57" / 40.0 mm guns (12x4 guns), 1.95lbs / 0.89kg shells, 1940 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
 Weight of broadside 4,428 lbs / 2,009 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 670.00 ft / 204.22 m 15.00 ft / 4.57 m
 Ends: Unarmoured
   Main Belt covers 140 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 670.00 ft / 204.22 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 3.00" / 76 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 1.00" / 25 mm       -         -

   - Armour deck: 4.00" / 102 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 189,933 shp / 141,690 Kw = 36.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 2,953 tons

Complement:
 945 - 1,229

Cost:
 £11.445 million / $45.781 million

Distribution of weights at normal displacement:
 Armament: 554 tons, 2.4 %
 Armour: 6,680 tons, 28.5 %
    - Belts: 1,993 tons, 8.5 %
    - Torpedo bulkhead: 620 tons, 2.6 %
    - Armament: 1,035 tons, 4.4 %
    - Armour Deck: 2,927 tons, 12.5 %
    - Conning Tower: 106 tons, 0.5 %
 Machinery: 5,078 tons, 21.7 %
 Hull, fittings & equipment: 8,590 tons, 36.7 %
 Fuel, ammunition & stores: 2,497 tons, 10.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,570 lbs / 13,866 Kg = 78.5 x 9.2 " / 234 mm shells or 3.5 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 3.7 ft / 1.1 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.66
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.590
 Length to Beam Ratio: 10.39 : 1
 'Natural speed' for length: 30.63 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 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:  33.00 ft / 10.06 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: 25.64 ft / 7.82 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 124.3 %
  - Above water (accommodation/working, high = better): 157.4 %
 Waterplane Area: 39,554 Square feet or 3,675 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 133 lbs/sq ft or 649 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.42
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The GB/CA/1937 design

The main goal for the GB/CA/1937 design was to increase the maximum speed to 36 knots. The only other increase was to the secondary armament, which is now 16-4.7in DP guns. The ship is large enough where 8in guns are almost too small. This is the Springsharp report:

GB/CA/1937, Great Britain Heavy Cruiser laid down 1937

Displacement:
 18,661 t light; 19,434 t standard; 21,000 t normal; 22,253 t full load

Dimensions: Length overall / water x beam x draught
 714.00 ft / 714.00 ft x 70.00 ft x 26.50 ft (normal load)
 217.63 m / 217.63 m x 21.34 m  x 8.08 m

Armament:
      12 - 8.00" / 203 mm guns (4x3 guns), 256.00lbs / 116.12kg shells, 1937 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      16 - 4.70" / 119 mm guns (8x2 guns), 51.91lbs / 23.55kg shells, 1937 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships
      48 - 1.57" / 40.0 mm guns (12x4 guns), 1.95lbs / 0.89kg shells, 1937 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
 Weight of broadside 3,996 lbs / 1,813 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 660.00 ft / 201.17 m 5.00 ft / 1.52 m
 Ends: Unarmoured
   Main Belt covers 142 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 660.00 ft / 201.17 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 3.00" / 76 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 1.00" / 25 mm       -         -

   - Armour deck: 4.00" / 102 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 176,963 shp / 132,014 Kw = 36.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 2,820 tons

Complement:
 871 - 1,133

Cost:
 £9.597 million / $38.387 million

Distribution of weights at normal displacement:
 Armament: 500 tons, 2.4 %
 Armour: 5,221 tons, 24.9 %
    - Belts: 652 tons, 3.1 %
    - Torpedo bulkhead: 611 tons, 2.9 %
    - Armament: 1,161 tons, 5.5 %
    - Armour Deck: 2,700 tons, 12.9 %
    - Conning Tower: 98 tons, 0.5 %
 Machinery: 4,905 tons, 23.4 %
 Hull, fittings & equipment: 8,035 tons, 38.3 %
 Fuel, ammunition & stores: 2,339 tons, 11.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   25,896 lbs / 11,746 Kg = 101.2 x 8.0 " / 203 mm shells or 3.0 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 15.9 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.555
 Length to Beam Ratio: 10.20 : 1
 'Natural speed' for length: 30.27 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 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:  32.00 ft / 9.75 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: 25.56 ft / 7.79 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 132.5 %
  - Above water (accommodation/working, high = better): 155.5 %
 Waterplane Area: 36,486 Square feet or 3,390 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 132 lbs/sq ft or 644 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.51
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The GB/CA/1935 design

The GB/CA/1935 design consolidates the progress made up to the previous design. The armour basis is now 5in and the range is 8,500nm at 15 knots. The maximum speed of 35 knots is competitive with the Japanese ships and probably is better, in that a larger ship with a higher freeboard will maintain its speed better in a seaway. This design can also hit harder than the Japanese, except for the torpedo situation. At least this design is said to be good for 3 torpedo hits, although perhaps of the 21in sort. This is the Springsharp report:

GB/CA/1935, Great Britain Heavy Cruiser laid down 1935

Displacement:
 17,212 t light; 17,931 t standard; 19,450 t normal; 20,665 t full load

Dimensions: Length overall / water x beam x draught
 694.00 ft / 694.00 ft x 68.00 ft x 25.00 ft (normal load)
 211.53 m / 211.53 m x 20.73 m  x 7.62 m

Armament:
      12 - 8.00" / 203 mm guns (4x3 guns), 256.00lbs / 116.12kg shells, 1935 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, 1935 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships
      40 - 1.57" / 40.0 mm guns (10x4 guns), 1.95lbs / 0.89kg shells, 1935 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
 Weight of broadside 3,773 lbs / 1,711 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 640.00 ft / 195.07 m 5.00 ft / 1.52 m
 Ends: Unarmoured
   Main Belt covers 142 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 640.00 ft / 195.07 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 3.00" / 76 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 1.00" / 25 mm       -         -

   - Armour deck: 4.00" / 102 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 154,269 shp / 115,084 Kw = 35.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 2,735 tons

Complement:
 823 - 1,070

Cost:
 £8.207 million / $32.829 million

Distribution of weights at normal displacement:
 Armament: 472 tons, 2.4 %
 Armour: 4,962 tons, 25.5 %
    - Belts: 633 tons, 3.3 %
    - Torpedo bulkhead: 568 tons, 2.9 %
    - Armament: 1,063 tons, 5.5 %
    - Armour Deck: 2,604 tons, 13.4 %
    - Conning Tower: 93 tons, 0.5 %
 Machinery: 4,383 tons, 22.5 %
 Hull, fittings & equipment: 7,396 tons, 38.0 %
 Fuel, ammunition & stores: 2,238 tons, 11.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   24,658 lbs / 11,185 Kg = 96.3 x 8.0 " / 203 mm shells or 3.0 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 3.3 ft / 1.0 m
 Roll period: 15.7 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.577
 Length to Beam Ratio: 10.21 : 1
 'Natural speed' for length: 29.78 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (50 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.56 ft / 7.49 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 130.8 %
  - Above water (accommodation/working, high = better): 149.8 %
 Waterplane Area: 35,189 Square feet or 3,269 Square metres
 Displacement factor (Displacement / loading): 111 %
 Structure weight / hull surface area: 129 lbs/sq ft or 628 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.42
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The GB/CA/1931 design

With the growth in the design series for the British heavy cruiser, I thought that the next obvious step would be to add a fourth triple-8in turret, bringing the main armament up to 12-8in BLR. I tried switching the 8in guns to QF, but Springsharp will not allow QF for 8in guns. Of course, in the 1890's, British armament manufacturers built 8in QF guns for use in Elswick cruisers. This is the Springsharp report:

GB/CA/1931, Great Britain Heavy Cruiser laid down 1931

Displacement:
 16,864 t light; 17,573 t standard; 18,950 t normal; 20,051 t full load

Dimensions: Length overall / water x beam x draught
 687.00 ft / 687.00 ft x 68.00 ft x 25.00 ft (normal load)
 209.40 m / 209.40 m x 20.73 m  x 7.62 m

Armament:
      12 - 8.00" / 203 mm guns (4x3 guns), 256.00lbs / 116.12kg shells, 1931 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, 1931 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships
      40 - 1.57" / 40.0 mm guns (10x4 guns), 2.00lbs / 0.91kg shells, 1931 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
 Weight of broadside 3,775 lbs / 1,712 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 640.00 ft / 195.07 m 5.00 ft / 1.52 m
 Ends: Unarmoured
   Main Belt covers 143 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 640.00 ft / 195.07 m 24.00 ft / 7.32 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: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 1.00" / 25 mm       -         -

   - Armour deck: 4.00" / 102 mm, Conning tower: 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 151,776 shp / 113,225 Kw = 35.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 2,478 tons

Complement:
 806 - 1,049

Cost:
 £7.077 million / $28.309 million

Distribution of weights at normal displacement:
 Armament: 472 tons, 2.5 %
 Armour: 4,646 tons, 24.5 %
    - Belts: 505 tons, 2.7 %
    - Torpedo bulkhead: 568 tons, 3.0 %
    - Armament: 940 tons, 5.0 %
    - Armour Deck: 2,555 tons, 13.5 %
    - Conning Tower: 77 tons, 0.4 %
 Machinery: 4,539 tons, 24.0 %
 Hull, fittings & equipment: 7,208 tons, 38.0 %
 Fuel, ammunition & stores: 2,086 tons, 11.0 %
 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): 1.11
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.568
 Length to Beam Ratio: 10.10 : 1
 'Natural speed' for length: 29.67 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (50 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.56 ft / 7.49 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 137.9 %
  - Above water (accommodation/working, high = better): 149.6 %
 Waterplane Area: 34,531 Square feet or 3,208 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 127 lbs/sq ft or 622 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.46
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The GB/CA/1927 design

This generation of the design series is somewhat similar to the American Baltimore class. This design suffers from the overweight machinery used by Springsharp. In reality, the machinery should be lighter in weight for the power produced. I did not want to do that for this complete design series, however. The GB/CA/1927 generation mainly increases the speed to 35 knots, and has a secondary armament of 12-4.7in DP guns. The deck armour is also increased to 3.5in. This is the Springsharp report:

GB/CA/1927, Great Britain Heavy Cruiser laid down 1927

Displacement:
 15,789 t light; 16,405 t standard; 17,600 t normal; 18,556 t full load

Dimensions: Length overall / water x beam x draught
 674.10 ft / 672.00 ft x 64.00 ft x 25.00 ft (normal load)
 205.47 m / 204.83 m x 19.51 m  x 7.62 m

Armament:
      9 - 8.00" / 203 mm guns (3x3 guns), 256.00lbs / 116.12kg shells, 1927 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      12 - 4.70" / 119 mm guns (6x2 guns), 51.91lbs / 23.55kg shells, 1927 Model
   Dual purpose guns in deck mounts with hoists
   on side, all amidships
      32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.89kg shells, 1927 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
      4 - 0.00" / 0.0 mm guns in single mounts, 0.00lbs / 0.00kg shells, 1927 Model
   Breech loading guns in deck mount 
   on side, evenly spread
 Weight of broadside 2,989 lbs / 1,356 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 600.00 ft / 182.88 m 14.00 ft / 4.27 m
 Ends: Unarmoured
   Main Belt covers 137 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 600.00 ft / 182.88 m 23.00 ft / 7.01 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: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 3.50" / 89 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 146,241 shp / 109,096 Kw = 35.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,152 tons

Complement:
 763 - 993

Cost:
 £5.501 million / $22.004 million

Distribution of weights at normal displacement:
 Armament: 374 tons, 2.1 %
 Armour: 4,491 tons, 25.5 %
    - Belts: 1,335 tons, 7.6 %
    - Torpedo bulkhead: 511 tons, 2.9 %
    - Armament: 519 tons, 2.9 %
    - Armour Deck: 2,068 tons, 11.8 %
    - Conning Tower: 58 tons, 0.3 %
 Machinery: 4,616 tons, 26.2 %
 Hull, fittings & equipment: 6,308 tons, 35.8 %
 Fuel, ammunition & stores: 1,811 tons, 10.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   20,013 lbs / 9,078 Kg = 78.2 x 8.0 " / 203 mm shells or 2.3 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 14.6 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.60
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.573
 Length to Beam Ratio: 10.50 : 1
 'Natural speed' for length: 29.25 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 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 %): 23.00 ft / 7.01 m
    - Mid (67 %):  23.00 ft / 7.01 m
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 23.56 ft / 7.18 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 148.2 %
  - Above water (accommodation/working, high = better): 136.4 %
 Waterplane Area: 31,944 Square feet or 2,968 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 118 lbs/sq ft or 574 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

The GB/CA/1923 design

The GB/CA/1923 design works quite well. The ship has a flush deck and a transom stern. The armament is almost the same as the 1921 ship, except that the light AA armament is now 32-2pdr AA. The belt is long enough to satisfy Springsharp, and is still 4in. The deck is increased to 3in. The maximum speed is now 34 knots, with the same 6,500nm range at 15 knots. This is the Springsharp report:

GB/CA/1923, Great Britain Heavy Cruiser laid down 1923

Displacement:
 15,013 t light; 15,591 t standard; 16,800 t normal; 17,767 t full load

Dimensions: Length overall / water x beam x draught
 657.03 ft / 655.00 ft x 64.00 ft x 23.00 ft (normal load)
 200.26 m / 199.64 m x 19.51 m  x 7.01 m

Armament:
      9 - 8.00" / 203 mm guns (3x3 guns), 256.00lbs / 116.12kg shells, 1923 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 4.70" / 119 mm guns (4x2 guns), 51.91lbs / 23.55kg shells, 1923 Model
   Dual purpose guns in deck mounts with hoists
   on side, all amidships
      32 - 1.57" / 40.0 mm guns (8x4 guns), 1.95lbs / 0.89kg shells, 1923 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
      4 - 0.00" / 0.0 mm guns in single mounts, 0.00lbs / 0.00kg shells, 1923 Model
   Breech loading guns in deck mount 
   on side, evenly spread
 Weight of broadside 2,782 lbs / 1,262 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 640.00 ft / 195.07 m 14.00 ft / 4.27 m
 Ends: Unarmoured
   Main Belt covers 150 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 640.00 ft / 195.07 m 22.00 ft / 6.71 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: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 130,529 shp / 97,375 Kw = 34.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,176 tons

Complement:
 737 - 959

Cost:
 £4.155 million / $16.620 million

Distribution of weights at normal displacement:
 Armament: 348 tons, 2.1 %
 Armour: 4,258 tons, 25.3 %
    - Belts: 1,398 tons, 8.3 %
    - Torpedo bulkhead: 521 tons, 3.1 %
    - Armament: 492 tons, 2.9 %
    - Armour Deck: 1,790 tons, 10.7 %
    - Conning Tower: 57 tons, 0.3 %
 Machinery: 4,363 tons, 26.0 %
 Hull, fittings & equipment: 6,044 tons, 36.0 %
 Fuel, ammunition & stores: 1,787 tons, 10.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   20,426 lbs / 9,265 Kg = 79.8 x 8.0 " / 203 mm shells or 2.4 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 3.5 ft / 1.1 m
 Roll period: 14.3 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.56
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.610
 Length to Beam Ratio: 10.23 : 1
 'Natural speed' for length: 28.84 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  29.00 ft / 8.84 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (67 %):  23.00 ft / 7.01 m
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 23.48 ft / 7.16 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 146.4 %
  - Above water (accommodation/working, high = better): 141.3 %
 Waterplane Area: 32,256 Square feet or 2,997 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 115 lbs/sq ft or 564 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.45
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The GB/CA/1921 design

I was greatly tempted to switch to light weight machinery, but I did not want to alter the series that way. I probably will try a new series with light weight machinery, to demonstrate the radical difference that I know it makes. The GB/CA/1921 does have a flush deck and triple 8in turrets, along with dual-purpose 4.7in guns. The speed is now 33 knots. The armour basis is still 4in and the deck is 2in. This is the Springsharp report:

GB/CA/1921, Great Britain Heavy Cruiser laid down 1921

Displacement:
 13,824 t light; 14,377 t standard; 15,600 t normal; 16,579 t full load

Dimensions: Length overall / water x beam x draught
 627.03 ft / 625.00 ft x 63.00 ft x 23.00 ft (normal load)
 191.12 m / 190.50 m x 19.20 m  x 7.01 m

Armament:
      9 - 8.00" / 203 mm guns (3x3 guns), 256.00lbs / 116.12kg 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 (4x2 guns), 51.91lbs / 23.55kg shells, 1921 Model
   Dual purpose guns in deck mounts with hoists
   on side, all amidships
      24 - 1.57" / 40.0 mm guns (6x4 guns), 2.00lbs / 0.91kg shells, 1921 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
      4 - 0.00" / 0.0 mm guns in single mounts, 0.00lbs / 0.00kg shells, 1921 Model
   Breech loading guns in deck mount 
   on side, evenly spread
 Weight of broadside 2,767 lbs / 1,255 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 590.00 ft / 179.83 m 14.00 ft / 4.27 m
 Ends: Unarmoured
   Main Belt covers 145 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 590.00 ft / 179.83 m 22.00 ft / 6.71 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: 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, 
 Direct drive, 4 shafts, 129,200 shp / 96,383 Kw = 33.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,202 tons

Complement:
 697 - 907

Cost:
 £3.556 million / $14.226 million

Distribution of weights at normal displacement:
 Armament: 346 tons, 2.2 %
 Armour: 3,397 tons, 21.8 %
    - Belts: 1,303 tons, 8.4 %
    - Torpedo bulkhead: 480 tons, 3.1 %
    - Armament: 492 tons, 3.2 %
    - Armour Deck: 1,068 tons, 6.8 %
    - Conning Tower: 54 tons, 0.3 %
 Machinery: 4,449 tons, 28.5 %
 Hull, fittings & equipment: 5,632 tons, 36.1 %
 Fuel, ammunition & stores: 1,776 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,545 lbs / 7,051 Kg = 60.7 x 8.0 " / 203 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 14.3 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.603
 Length to Beam Ratio: 9.92 : 1
 'Natural speed' for length: 25.00 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  29.00 ft / 8.84 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (67 %):  23.00 ft / 7.01 m
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 23.48 ft / 7.16 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 161.0 %
  - Above water (accommodation/working, high = better): 130.7 %
 Waterplane Area: 28,876 Square feet or 2,683 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 115 lbs/sq ft or 561 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.59
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

My latest design for a British 8in-gun cruiser laid down in 1918

My opinion is that a satisfactory 8in cruiser design could not be restricted to 10,000 tons, standard. The design I propose hear is much larger, and is pretty well protected, as well as having an 8in gun armament and a 4in armour basis. The maximum speed is 32 knots with a 6,500nm range at 15 knots. I suspect that the ship should have lighter machinery (instead of 27.7 SHP/ton), and that this would cure the complaints about belt length. Contemporary Japanese ships had much lighter machinery. This is the Springsharp report:

GB/CA/1918, Great Britain Heavy Cruiser laid down 1918

Displacement:
 12,720 t light; 13,243 t standard; 14,500 t normal; 15,506 t full load

Dimensions: Length overall / water x beam x draught
 616.96 ft / 615.00 ft x 63.00 ft x 23.00 ft (normal load)
 188.05 m / 187.45 m x 19.20 m  x 7.01 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1918 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, 1918 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1918 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread
      24 - 1.57" / 40.0 mm guns (6x4 guns), 2.00lbs / 0.91kg shells, 1918 Model
   Breech loading guns in deck mounts 
   on side, evenly spread
 Weight of broadside 2,639 lbs / 1,197 kg
 Shells per gun, main battery: 150
 12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 570.00 ft / 173.74 m 14.00 ft / 4.27 m
 Ends: Unarmoured
   Main Belt covers 143 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 570.00 ft / 173.74 m 22.00 ft / 6.71 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: 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, 
 Direct drive, 4 shafts, 108,215 shp / 80,728 Kw = 32.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,263 tons

Complement:
 659 - 858

Cost:
 £2.538 million / $10.150 million

Distribution of weights at normal displacement:
 Armament: 330 tons, 2.3 %
 Armour: 3,299 tons, 22.7 %
    - Belts: 1,263 tons, 8.7 %
    - Torpedo bulkhead: 464 tons, 3.2 %
    - Armament: 502 tons, 3.5 %
    - Armour Deck: 1,019 tons, 7.0 %
    - Conning Tower: 51 tons, 0.4 %
 Machinery: 3,904 tons, 26.9 %
 Hull, fittings & equipment: 5,188 tons, 35.8 %
 Fuel, ammunition & stores: 1,780 tons, 12.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,585 lbs / 7,069 Kg = 60.9 x 8.0 " / 203 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 3.5 ft / 1.1 m
 Roll period: 14.2 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.57
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.569
 Length to Beam Ratio: 9.76 : 1
 'Natural speed' for length: 24.80 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 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 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 21.68 ft / 6.61 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 154.2 %
  - Above water (accommodation/working, high = better): 136.4 %
 Waterplane Area: 27,539 Square feet or 2,558 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 115 lbs/sq ft or 561 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.36
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

My quick and dirty GB/CA/1916 design

The main problem with my GB/CA/1916 design has to do with the armament layout. Can 9-8in guns fit on the centerline, even with superfiring guns? Also, Springsharp is behaving strangely with respect to the belt length. I was not able to satisfy the magazine and machinery coverage, despite a long belt and having increased the height to 14ft. The speed is now 30 knots with a range of 6,200nm at 15 knots. I have retained the 4.7in gun secondary armament, and increased the torpedo armament to 8 tubes. The design should be superior to the Raleighs and the Kakos, except for the latter's high speed. This is the Springsharp report:

GB/CA/1916, Great Britain Cruiser laid down 1916

Displacement:
 10,369 t light; 10,854 t standard; 12,000 t normal; 12,917 t full load

Dimensions: Length overall / water x beam x draught
 596.42 ft / 595.00 ft x 60.00 ft x 22.00 ft (normal load)
 181.79 m / 181.36 m x 18.29 m  x 6.71 m

Armament:
      9 - 8.00" / 203 mm guns in single mounts, 256.00lbs / 116.12kg shells, 1916 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, majority forward, 3 raised mounts - superfiring
      8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1916 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1916 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread
      16 - 1.57" / 40.0 mm guns (4x4 guns), 2.00lbs / 0.91kg shells, 1916 Model
   Breech loading guns in deck mounts 
   on side, evenly spread
 Weight of broadside 2,815 lbs / 1,277 kg
 Shells per gun, main battery: 150
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 550.00 ft / 167.64 m 14.00 ft / 4.27 m
 Ends: Unarmoured
   Main Belt covers 142 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 550.00 ft / 167.64 m 20.00 ft / 6.10 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: 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, 
 Direct drive, 4 shafts, 73,876 shp / 55,111 Kw = 30.00 kts
 Range 6,200nm at 15.00 kts
 Bunker at max displacement = 2,064 tons

Complement:
 573 - 745

Cost:
 £1.708 million / $6.832 million

Distribution of weights at normal displacement:
 Armament: 352 tons, 2.9 %
 Armour: 2,863 tons, 23.9 %
    - Belts: 1,216 tons, 10.1 %
    - Torpedo bulkhead: 407 tons, 3.4 %
    - Armament: 286 tons, 2.4 %
    - Armour Deck: 909 tons, 7.6 %
    - Conning Tower: 45 tons, 0.4 %
 Machinery: 2,752 tons, 22.9 %
 Hull, fittings & equipment: 4,401 tons, 36.7 %
 Fuel, ammunition & stores: 1,631 tons, 13.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   14,896 lbs / 6,757 Kg = 58.2 x 8.0 " / 203 mm shells or 2.1 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 3.2 ft / 1.0 m
 Roll period: 14.0 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.73
 Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.535
 Length to Beam Ratio: 9.92 : 1
 'Natural speed' for length: 24.39 kts
 Power going to wave formation at top speed: 54 %
 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:  27.00 ft / 8.23 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (67 %):  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: 20.68 ft / 6.30 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 146.2 %
  - Above water (accommodation/working, high = better): 143.5 %
 Waterplane Area: 24,562 Square feet or 2,282 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 108 lbs/sq ft or 527 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.41
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

Another attempt at an 8in gun cruiser from 1914

I wanted to try again to design a series of 8in gun British cruisers, starting in 1914. I would have liked a higher speed, but 28.5 knots was what was readily achievable. The armour basis is 4in with a 2in deck. This is the Springsharp report:

GB/CA/1914, Great Britain Cruiser laid down 1914

Displacement:
 8,359 t light; 8,747 t standard; 9,700 t normal; 10,462 t full load

Dimensions: Length overall / water x beam x draught
 546.36 ft / 545.00 ft x 56.00 ft x 20.00 ft (normal load)
 166.53 m / 166.12 m x 17.07 m  x 6.10 m

Armament:
      7 - 8.00" / 203 mm guns in single mounts, 256.00lbs / 116.12kg shells, 1914 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, majority forward, 3 raised mounts - superfiring
      8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1914 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
      2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1914 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread
 Weight of broadside 2,234 lbs / 1,013 kg
 Shells per gun, main battery: 150
 4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 520.00 ft / 158.50 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 147 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 520.00 ft / 158.50 m 18.00 ft / 5.49 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: 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, 
 Direct drive, 4 shafts, 55,251 shp / 41,217 Kw = 28.50 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 1,715 tons

Complement:
 488 - 635

Cost:
 £1.050 million / $4.201 million

Distribution of weights at normal displacement:
 Armament: 279 tons, 2.9 %
 Armour: 2,394 tons, 24.7 %
    - Belts: 980 tons, 10.1 %
    - Torpedo bulkhead: 346 tons, 3.6 %
    - Armament: 236 tons, 2.4 %
    - Armour Deck: 793 tons, 8.2 %
    - Conning Tower: 39 tons, 0.4 %
 Machinery: 2,128 tons, 21.9 %
 Hull, fittings & equipment: 3,557 tons, 36.7 %
 Fuel, ammunition & stores: 1,341 tons, 13.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   12,616 lbs / 5,723 Kg = 49.3 x 8.0 " / 203 mm shells or 1.9 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 2.9 ft / 0.9 m
 Roll period: 13.9 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.76
 Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.556
 Length to Beam Ratio: 9.73 : 1
 'Natural speed' for length: 23.35 kts
 Power going to wave formation at top speed: 54 %
 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:  26.00 ft / 7.92 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (67 %):  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: 19.68 ft / 6.00 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 146.0 %
  - Above water (accommodation/working, high = better): 150.5 %
 Waterplane Area: 21,424 Square feet or 1,990 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 100 lbs/sq ft or 489 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.47
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

The GB/CL/1937 converted to an 8in-gun cruiser: GB/CA/1937

I thought that converting the GB/CL/1937 to have 8-in guns would be interesting, sort of along the lines of the Mogami class. The speed is reduced to 35 knots, which is sufficient, anyway. The new armament is 8-8in BLR, 12-4in AA, 32-2pdr AA, and 16-21in TT. The armour basis is still 4in with a 2in deck. I did decide that a heavy cruiser needed a torpedo bulkhead, and that was a factor in reducing the speed. This is the revised Springsharp report:

GB/CA/1937, Great Britain Heavy Cruiser laid down 1937

Displacement:
 13,882 t light; 14,342 t standard; 15,700 t normal; 16,786 t full load

Dimensions: Length overall / water x beam x draught
 668.96 ft / 665.00 ft x 64.00 ft x 25.00 ft (normal load)
 203.90 m / 202.69 m x 19.51 m  x 7.62 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 ends, evenly spread, 2 raised mounts - superfiring
      12 - 4.00" / 102 mm guns (6x2 guns), 32.00lbs / 14.51kg shells, 1937 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      32 - 1.57" / 40.0 mm guns (8x4 guns), 2.00lbs / 0.91kg shells, 1937 Model
   Breech loading guns in deck mounts 
   on side, evenly spread, 4 raised mounts
 Weight of broadside 2,496 lbs / 1,132 kg
 Shells per gun, main battery: 100
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 560.00 ft / 170.69 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 130 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 560.00 ft / 170.69 m 24.00 ft / 7.32 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  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, 153,169 shp / 114,264 Kw = 35.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 2,444 tons

Complement:
 700 - 911

Cost:
 £7.321 million / $29.283 million

Distribution of weights at normal displacement:
 Armament: 312 tons, 2.0 %
 Armour: 3,220 tons, 20.5 %
    - Belts: 1,075 tons, 6.8 %
    - Torpedo bulkhead: 497 tons, 3.2 %
    - Armament: 529 tons, 3.4 %
    - Armour Deck: 1,065 tons, 6.8 %
    - Conning Tower: 54 tons, 0.3 %
 Machinery: 4,245 tons, 27.0 %
 Hull, fittings & equipment: 6,105 tons, 38.9 %
 Fuel, ammunition & stores: 1,818 tons, 11.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   17,756 lbs / 8,054 Kg = 69.4 x 8.0 " / 203 mm shells or 2.2 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 3.2 ft / 1.0 m
 Roll period: 15.0 seconds
 Steadiness - As gun platform (Average = 50 %): 59 %
   - Recoil effect (Restricted arc if above 1.00): 0.63
 Seaboat quality  (Average = 1.00): 1.18

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.516
 Length to Beam Ratio: 10.39 : 1
 'Natural speed' for length: 25.79 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 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 %): 24.00 ft / 7.32 m
    - Mid (50 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.32 ft / 7.41 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 149.7 %
  - Above water (accommodation/working, high = better): 139.3 %
 Waterplane Area: 28,788 Square feet or 2,674 Square metres
 Displacement factor (Displacement / loading): 111 %
 Structure weight / hull surface area: 118 lbs/sq ft or 576 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.71
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

A really extreme ship: the GB/CL/1937 design

I would call the GB/CL/1937 design extreme due to the ship's size and the high speed. I would never expect that British to build such a fast ship, although it would be very capable. The armour basis is still 4in and the deck is 2in. There is no torpedo bulkhead armour. The speed is 37 knots with a range of 8,500nm at 15 knots. The armament is 12-6in QF, 12-4in AA, 32-2pdr AA guns, and 16-21in TT. This is the Springsharp report:

GB/CL/1937, Great Britain Light Cruiser laid down 1937

Displacement:
 14,150 t light; 14,627 t standard; 16,000 t normal; 17,098 t full load

Dimensions: Length overall / water x beam x draught
 668.96 ft / 665.00 ft x 64.00 ft x 25.00 ft (normal load)
 203.90 m / 202.69 m x 19.51 m  x 7.62 m

Armament:
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1937 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 1 raised mount - superfiring
      12 - 4.00" / 102 mm guns (6x2 guns), 32.00lbs / 14.51kg shells, 1937 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, 4 raised mounts - superfiring
      32 - 1.57" / 40.0 mm guns (8x4 guns), 2.00lbs / 0.91kg shells, 1937 Model
   Anti-aircraft guns in deck mounts 
   on side ends, evenly spread, 4 raised mounts - superfiring
 Weight of broadside 1,744 lbs / 791 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 560.00 ft / 170.69 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 130 % of normal length

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

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 195,898 shp / 146,140 Kw = 37.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 2,471 tons

Complement:
 710 - 924

Cost:
 £7.846 million / $31.382 million

Distribution of weights at normal displacement:
 Armament: 218 tons, 1.4 %
 Armour: 2,624 tons, 16.4 %
    - Belts: 1,076 tons, 6.7 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 419 tons, 2.6 %
    - Armour Deck: 1,075 tons, 6.7 %
    - Conning Tower: 55 tons, 0.3 %
 Machinery: 5,430 tons, 33.9 %
 Hull, fittings & equipment: 5,879 tons, 36.7 %
 Fuel, ammunition & stores: 1,850 tons, 11.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   13,562 lbs / 6,152 Kg = 125.6 x 6.0 " / 152 mm shells or 1.4 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 14.1 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.36
 Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.526
 Length to Beam Ratio: 10.39 : 1
 'Natural speed' for length: 25.79 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 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 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.32 ft / 7.41 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 120.7 %
  - Above water (accommodation/working, high = better): 138.6 %
 Waterplane Area: 29,052 Square feet or 2,699 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 113 lbs/sq ft or 551 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.77
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The GB/CL/1935 light cruiser design

The GB/CL/1935 design is almost a Mogami-type ship, except that this design has a larger displacement and a deeper draft. The draft is abnormal, as this is a convenient way, in Springsharp, to increase strength. I am sorry to say that I will resort to such measures. The main difference with this design is the 36-knot speed and the 8,500nm range at 15 knots. The armour basis is still 4in with a 2in deck. The armament stayed the same with 12-6in QF, 8-4in AA, 28-2pdr AA, and 16-21in TT. This is the Springsharp report:

GB/CL/1935, Great Britain Light Cruiser laid down 1935

Displacement:
 12,475 t light; 12,901 t standard; 14,200 t normal; 15,239 t full load

Dimensions: Length overall / water x beam x draught
 646.42 ft / 645.00 ft x 62.00 ft x 25.00 ft (normal load)
 197.03 m / 196.60 m x 18.90 m  x 7.62 m

Armament:
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1935 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 1 raised mount - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1935 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1935 Model
   Anti-aircraft guns in deck mounts 
   on side ends, majority aft, 3 raised mounts - superfiring
 Weight of broadside 1,607 lbs / 729 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 550.00 ft / 167.64 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 131 % of normal length

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

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 162,325 shp / 121,094 Kw = 36.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 2,338 tons

Complement:
 649 - 845

Cost:
 £6.368 million / $25.474 million

Distribution of weights at normal displacement:
 Armament: 201 tons, 1.4 %
 Armour: 2,471 tons, 17.4 %
    - Belts: 1,053 tons, 7.4 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 384 tons, 2.7 %
    - Armour Deck: 983 tons, 6.9 %
    - Conning Tower: 51 tons, 0.4 %
 Machinery: 4,612 tons, 32.5 %
 Hull, fittings & equipment: 5,192 tons, 36.6 %
 Fuel, ammunition & stores: 1,725 tons, 12.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   12,772 lbs / 5,793 Kg = 118.3 x 6.0 " / 152 mm shells or 1.4 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 3.5 ft / 1.1 m
 Roll period: 14.0 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.36
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.497
 Length to Beam Ratio: 10.40 : 1
 'Natural speed' for length: 25.40 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:  27.00 ft / 8.23 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (67 %):  25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 22.52 ft / 6.86 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 116.5 %
  - Above water (accommodation/working, high = better): 128.7 %
 Waterplane Area: 26,575 Square feet or 2,469 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 110 lbs/sq ft or 538 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.65
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

A more capable British light cruiser is possible by 1931

By ballooning the displacement even more, a 35-knot light cruiser with 12-6in QF, 8-4in AA, 28-2pdr AA, and 16-21in TT is possible. The armour basis is still 4in and the range is now 8,200nm at 15 knots. This design, the GB/CL/1931, is roughly comparable to the Mogami class prior to being rearmed with 8in guns. This is the Springsharp report:

GB/CL/1931, Great Britain Light Cruiser laid down 1931

Displacement:
 11,644 t light; 12,052 t standard; 13,300 t normal; 14,298 t full load

Dimensions: Length overall / water x beam x draught
 626.42 ft / 625.00 ft x 61.00 ft x 24.00 ft (normal load)
 190.93 m / 190.50 m x 18.59 m  x 7.32 m

Armament:
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1931 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 1 raised mount - 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, all raised mounts - superfiring
      28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1931 Model
   Anti-aircraft guns in deck mounts 
   on side ends, majority aft, 3 raised mounts - superfiring
 Weight of broadside 1,607 lbs / 729 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 550.00 ft / 167.64 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 135 % of normal length

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

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 141,896 shp / 105,854 Kw = 35.00 kts
 Range 8,200nm at 15.00 kts
 Bunker at max displacement = 2,246 tons

Complement:
 619 - 805

Cost:
 £5.107 million / $20.427 million

Distribution of weights at normal displacement:
 Armament: 201 tons, 1.5 %
 Armour: 2,417 tons, 18.2 %
    - Belts: 1,049 tons, 7.9 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 372 tons, 2.8 %
    - Armour Deck: 947 tons, 7.1 %
    - Conning Tower: 48 tons, 0.4 %
 Machinery: 4,243 tons, 31.9 %
 Hull, fittings & equipment: 4,783 tons, 36.0 %
 Fuel, ammunition & stores: 1,656 tons, 12.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   12,129 lbs / 5,502 Kg = 112.3 x 6.0 " / 152 mm shells or 1.4 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 13.8 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.37
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.509
 Length to Beam Ratio: 10.25 : 1
 'Natural speed' for length: 25.00 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:  27.00 ft / 8.23 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 21.60 ft / 6.58 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.4 %
  - Above water (accommodation/working, high = better): 122.0 %
 Waterplane Area: 25,606 Square feet or 2,379 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 108 lbs/sq ft or 527 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.55
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

The GB/CL/1927 design

This is sort of a heftier version of the Italian light cruisers. The maximum speed is 34.5 knots and the range is 8,000nm at 15 knots. The armour basis is still 4in. The armament is 9-6in QF in triple turrets, 8-4.7in AA, 28-2pdr AA guns, and 16-21in TT. This is the Springsharp report:

GB/CL/1927, Great Britain Light Cruiser laid down 1927

Displacement:
 11,268 t light; 11,657 t standard; 12,900 t normal; 13,895 t full load

Dimensions: Length overall / water x beam x draught
 616.42 ft / 615.00 ft x 59.00 ft x 23.00 ft (normal load)
 187.88 m / 187.45 m x 17.98 m  x 7.01 m

Armament:
      9 - 6.00" / 152 mm guns (3x3 guns), 108.00lbs / 48.99kg shells, 1927 Model
   Quick firing 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, 1927 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1927 Model
   Anti-aircraft guns in deck mounts 
   on side ends, majority aft, 3 raised mounts - superfiring
 Weight of broadside 1,442 lbs / 654 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 550.00 ft / 167.64 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 138 % of normal length

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

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 133,899 shp / 99,889 Kw = 34.50 kts
 Range 8,000nm at 15.00 kts
 Bunker at max displacement = 2,238 tons

Complement:
 604 - 786

Cost:
 £4.136 million / $16.546 million

Distribution of weights at normal displacement:
 Armament: 180 tons, 1.4 %
 Armour: 2,319 tons, 18.0 %
    - Belts: 1,047 tons, 8.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 295 tons, 2.3 %
    - Armour Deck: 929 tons, 7.2 %
    - Conning Tower: 47 tons, 0.4 %
 Machinery: 4,227 tons, 32.8 %
 Hull, fittings & equipment: 4,543 tons, 35.2 %
 Fuel, ammunition & stores: 1,632 tons, 12.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   11,498 lbs / 5,215 Kg = 106.5 x 6.0 " / 152 mm shells or 1.3 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 3.3 ft / 1.0 m
 Roll period: 13.6 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.38
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.541
 Length to Beam Ratio: 10.42 : 1
 'Natural speed' for length: 24.80 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:  27.00 ft / 8.23 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 21.60 ft / 6.58 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 117.3 %
  - Above water (accommodation/working, high = better): 120.1 %
 Waterplane Area: 25,111 Square feet or 2,333 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 104 lbs/sq ft or 507 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.56
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

An incremental advance to the GB/CL/1923

The increase in performance to the GB/CL/1923 is not huge, but the result is still a better design than its predecessor from 1921. This ship has a similar armament: 8-6in QF, 6-4.7in AA, 24-2pdr AA, and 16-21in TT. The speed is now 33.75 knots for a range of 7,800nm at 15 knots. The main armament is light, but the armour basis is 4in with a 2in deck. This is the Springsharp report:

GB/CL/1923, Great Britain Light Cruiser laid down 1923

Displacement:
 10,627 t light; 10,981 t standard; 12,200 t normal; 13,175 t full load

Dimensions: Length overall / water x beam x draught
 596.42 ft / 595.00 ft x 58.00 ft x 23.00 ft (normal load)
 181.79 m / 181.36 m x 17.68 m  x 7.01 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1923 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 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
      24 - 1.57" / 40.0 mm guns (6x4 guns), 2.00lbs / 0.91kg shells, 1923 Model
   Breech loading guns in deck mounts 
   on side ends, evenly spread
 Weight of broadside 1,223 lbs / 555 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 520.00 ft / 158.50 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 134 % of normal length

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

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 120,061 shp / 89,566 Kw = 33.75 kts
 Range 7,800nm at 15.00 kts
 Bunker at max displacement = 2,194 tons

Complement:
 579 - 754

Cost:
 £3.090 million / $12.359 million

Distribution of weights at normal displacement:
 Armament: 153 tons, 1.3 %
 Armour: 2,232 tons, 18.3 %
    - Belts: 994 tons, 8.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 311 tons, 2.5 %
    - Armour Deck: 881 tons, 7.2 %
    - Conning Tower: 46 tons, 0.4 %
 Machinery: 4,013 tons, 32.9 %
 Hull, fittings & equipment: 4,230 tons, 34.7 %
 Fuel, ammunition & stores: 1,573 tons, 12.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   10,937 lbs / 4,961 Kg = 101.3 x 6.0 " / 152 mm shells or 1.3 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 3.2 ft / 1.0 m
 Roll period: 13.7 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.36
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.538
 Length to Beam Ratio: 10.26 : 1
 'Natural speed' for length: 24.39 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:  27.00 ft / 8.23 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 21.60 ft / 6.58 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 116.6 %
  - Above water (accommodation/working, high = better): 116.1 %
 Waterplane Area: 23,814 Square feet or 2,212 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 100 lbs/sq ft or 490 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.66
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

The GB/CL/1921 light cruiser in this design series

The next installment of my British light cruiser design series is the GB/CL/1921. This is as large as it is for several reasons. One is that the speed is somewhat high at 33 knots. The range is also substantial at 7,200nm at 15 knots. The armour basis is 4in with a 2in deck, and that is a contributing factor. The armament is little different: 8-6in QF, 4-4in AA, 16-2pdr AA, and 12-21in TT. One thing I found is that if you leave the submerged tubes blank, rather than zero, bad things happen. I wouldn't be surprised if something like that appears in some of the other designs. This is the Springsharp report:

GB/CL/1921, Great Britain Light Cruiser laid down 1921

Displacement:
 10,066 t light; 10,386 t standard; 11,500 t normal; 12,391 t full load

Dimensions: Length overall / water x beam x draught
 576.42 ft / 575.00 ft x 58.00 ft x 21.00 ft (normal load)
 175.69 m / 175.26 m x 17.68 m  x 6.40 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 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
      16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Breech loading guns in deck mounts 
   on side ends, evenly spread
 Weight of broadside 1,023 lbs / 464 kg
 Shells per gun, main battery: 150
 12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 485.00 ft / 147.83 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 130 % of normal length

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

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 109,722 shp / 81,853 Kw = 33.00 kts
 Range 7,200nm at 15.00 kts
 Bunker at max displacement = 2,006 tons

Complement:
 554 - 721

Cost:
 £2.517 million / $10.067 million

Distribution of weights at normal displacement:
 Armament: 128 tons, 1.1 %
 Armour: 2,172 tons, 18.9 %
    - Belts: 936 tons, 8.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 311 tons, 2.7 %
    - Armour Deck: 881 tons, 7.7 %
    - Conning Tower: 44 tons, 0.4 %
 Machinery: 3,778 tons, 32.9 %
 Hull, fittings & equipment: 3,988 tons, 34.7 %
 Fuel, ammunition & stores: 1,434 tons, 12.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   10,982 lbs / 4,982 Kg = 101.7 x 6.0 " / 152 mm shells or 1.3 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 3.2 ft / 1.0 m
 Roll period: 13.5 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.30
 Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.575
 Length to Beam Ratio: 9.91 : 1
 'Natural speed' for length: 23.98 kts
 Power going to wave formation at top speed: 61 %
 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:  27.00 ft / 8.23 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 21.60 ft / 6.58 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.4 %
  - Above water (accommodation/working, high = better): 134.2 %
 Waterplane Area: 23,821 Square feet or 2,213 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 98 lbs/sq ft or 478 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