My idea of the Hood as it might have been built: GB/CB/1915

The basis for the original Hood concept in 1915 has always interested me. Here is another attempt at such a ship: the GB/CB/1915 design with 8-15in/42 BLR, 16-5.5in QF, an armour basis of 8in and a speed of 32 knots. This is the Springsharp report:

GB/CB/1915, Great Britain Battlecruiser laid down 1915 (Engine 1919)

Displacement:
 41,011 t light; 43,359 t standard; 46,714 t normal; 49,398 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (860.06 ft / 855.00 ft) x 105.00 ft x (29.00 / 30.39 ft)
 (262.15 m / 260.60 m) x 32.00 m  x (8.84 / 9.26 m)

Armament:
      8 - 15.00" / 381 mm 42.0 cal guns - 1,950.00lbs / 884.51kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1915 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      16 - 5.50" / 140 mm 50.0 cal guns - 85.00lbs / 38.56kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1915 Model
   16 x Single mounts on sides, evenly spread
  4 raised mounts
      Weight of broadside 16,960 lbs / 7,693 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 600.00 ft / 182.88 m 17.00 ft / 5.18 m
 Ends: 4.00" / 102 mm 255.00 ft / 77.72 m 12.00 ft / 3.66 m
   Main Belt covers 108 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined 12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 600.00 ft / 182.88 m 29.00 ft / 8.84 m
 Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 7.00" / 178 mm  10.0" / 254 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 10.00" / 254 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 207,000 shp / 154,422 Kw = 32.00 kts
 Range 6,500nm at 17.00 kts
 Bunker at max displacement = 6,039 tons

Complement:
 1,588 - 2,065

Cost:
 £5.458 million / $21.830 million

Distribution of weights at normal displacement:
 Armament: 2,446 tons, 5.2 %
    - Guns: 2,446 tons, 5.2 %
 Armour: 12,626 tons, 27.0 %
    - Belts: 3,863 tons, 8.3 %
    - Torpedo bulkhead: 1,288 tons, 2.8 %
    - Armament: 3,209 tons, 6.9 %
    - Armour Deck: 3,764 tons, 8.1 %
    - Conning Towers: 503 tons, 1.1 %
 Machinery: 7,351 tons, 15.7 %
 Hull, fittings & equipment: 18,588 tons, 39.8 %
 Fuel, ammunition & stores: 5,703 tons, 12.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   73,288 lbs / 33,243 Kg = 43.4 x 15.0 " / 381 mm shells or 9.6 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.81
 Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
 Hull has low quarterdeck ,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.628 / 0.634
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 kts
 Power going to wave formation at top speed: 53 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 28.00 %,  36.00 ft / 10.97 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  30.00 ft / 9.14 m
    - Aft deck: 14.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 28.00 %,  20.00 ft / 6.10 m,  22.00 ft / 6.71 m
    - Average freeboard:  28.79 ft / 8.77 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 116.9 %
  - Above water (accommodation/working, high = better): 248.0 %
 Waterplane Area: 67,393 Square feet or 6,261 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 203 lbs/sq ft or 991 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.22
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

Another try at a Super Lion (GB/CB/1912)

This version of the Super Lion design is so good, there must be something wrong with the specification. This is a 30-knot battlecruiser with 10-15in/42 and 14-6in/50 QF guns, a 12in belt, 3in deck, and 7,500nm range:

GB/CB/1912 Super Lion, Great Britain Battlecruiser laid down 1912 (Engine 1918)

Displacement:
 41,153 t light; 43,216 t standard; 47,751 t normal; 51,378 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (823.00 ft / 815.00 ft) x 105.00 ft x (31.00 / 32.97 ft)
 (250.85 m / 248.41 m) x 32.00 m  x (9.45 / 10.05 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,950.00lbs / 884.51kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1912 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, aft deck forward
      14 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1912 Model
   14 x Single mounts on sides, evenly spread
  14 hull mounts in casemates- Limited use in heavy seas
      Weight of broadside 21,101 lbs / 9,571 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 525.00 ft / 160.02 m 9.00 ft / 2.74 m
 Ends: 5.00" / 127 mm 290.00 ft / 88.39 m 16.00 ft / 4.88 m
 Upper: 8.00" / 203 mm 525.00 ft / 160.02 m 8.00 ft / 2.44 m
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 525.00 ft / 160.02 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 72.00 ft / 21.95 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  12.0" / 305 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 165,755 shp / 123,653 Kw = 30.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 8,162 tons

Complement:
 1,614 - 2,099

Cost:
 £3.785 million / $15.142 million

Distribution of weights at normal displacement:
 Armament: 2,838 tons, 5.9 %
    - Guns: 2,838 tons, 5.9 %
 Armour: 14,193 tons, 29.7 %
    - Belts: 4,720 tons, 9.9 %
    - Torpedo bulkhead: 903 tons, 1.9 %
    - Armament: 4,407 tons, 9.2 %
    - Armour Deck: 3,596 tons, 7.5 %
    - Conning Towers: 567 tons, 1.2 %
 Machinery: 5,980 tons, 12.5 %
 Hull, fittings & equipment: 18,143 tons, 38.0 %
 Fuel, ammunition & stores: 6,598 tons, 13.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   77,044 lbs / 34,946 Kg = 45.7 x 15.0 " / 381 mm shells or 10.3 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 61 %
   - Recoil effect (Restricted arc if above 1.00): 0.94
 Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.630 / 0.637
 Length to Beam Ratio: 7.76 : 1
 'Natural speed' for length: 28.55 kts
 Power going to wave formation at top speed: 52 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  31.00 ft / 9.45 m,  30.00 ft / 9.14 m
    - Forward deck: 30.00 %,  30.00 ft / 9.14 m,  29.00 ft / 8.84 m
    - Aft deck: 18.00 %,  29.00 ft / 8.84 m,  29.00 ft / 8.84 m
    - Quarter deck: 27.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
    - Average freeboard:  27.34 ft / 8.33 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 102.3 %
  - Above water (accommodation/working, high = better): 222.6 %
 Waterplane Area: 64,359 Square feet or 5,979 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 209 lbs/sq ft or 1,020 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.29
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

My attempt at an Italian armoured cruiser: It/CA/1897

I am interested in the Spanish cruiser Cristobal Colon, lost at the Battle of Santiago Bay in 1898. The Cristobal Colon was Italian-built along the lines of a series of armoured cruisers. My It/CA/1897 has 2-10in/45, 14-6in/50 QF, and 10-3in QF guns. The armour basis is 6in and the deck is 2in. The speed is a modest 20 knots. I struggled with the Springsharp 3.0 Beta 3, as I kept having "NaN" (not a number). The problem was that I had missed some settings. Once I had found all the places, then I had a workable design. I had to greatly increase the displacement and lighten the machinery for the power. This is the Springsharp report:

It/CA/1897, Italy Armoured Cruiser laid down 1897 (Engine 1904)

Displacement:
 8,028 t light; 8,405 t standard; 9,073 t normal; 9,608 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (354.00 ft / 345.00 ft) x 60.00 ft x (23.00 / 24.16 ft)
 (107.90 m / 105.16 m) x 18.29 m  x (7.01 / 7.36 m)

Armament:
      2 - 10.00" / 254 mm 45.0 cal guns - 504.26lbs / 228.73kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1897 Model
   2 x Single mounts on centreline ends, evenly spread
      14 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1897 Model
   10 x Single mounts on sides, evenly spread
  10 hull mounts in casemates- Limited use in all but light seas
   4 x Single mounts layout not set
      10 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 150 per gun
   Quick firing guns in deck mounts, 1897 Model
   10 x Single mounts on sides, evenly spread
  10 raised mounts
      Weight of broadside 2,745 lbs / 1,245 kg
      Main Torpedoes
      4 - 18.0" / 457 mm, 19.00 ft / 5.79 m torpedoes - 0.618 t each, 2.471 t total
 In 4 sets of deck mounted carriage/fixed tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 200.00 ft / 60.96 m 25.00 ft / 7.62 m
 Ends: 4.50" / 114 mm 145.00 ft / 44.20 m 9.00 ft / 2.74 m
   Main Belt covers 89 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.00" / 25 mm 200.00 ft / 60.96 m 23.00 ft / 7.01 m
 Beam between torpedo bulkheads 43.00 ft / 13.11 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: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm
 3rd: 1.00" / 25 mm       -         -

   - Protected deck - single deck:
 For and Aft decks: 2.00" / 51 mm
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 6.00" / 152 mm, Aft 0.00" / 0 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 2 shafts, 17,193 ihp / 12,826 Kw = 20.00 kts
 Range 3,500nm at 12.00 kts
 Bunker at max displacement = 1,203 tons (100% coal)

Complement:
 464 - 604

Cost:
 £0.820 million / $3.280 million

Distribution of weights at normal displacement:
 Armament: 612 tons, 6.7 %
    - Guns: 609 tons, 6.7 %
    - Weapons: 3 tons, 0.0 %
 Armour: 2,895 tons, 31.9 %
    - Belts: 1,602 tons, 17.7 %
    - Torpedo bulkhead: 170 tons, 1.9 %
    - Armament: 466 tons, 5.1 %
    - Armour Deck: 600 tons, 6.6 %
    - Conning Tower: 56 tons, 0.6 %
 Machinery: 2,528 tons, 27.9 %
 Hull, fittings & equipment: 1,993 tons, 22.0 %
 Fuel, ammunition & stores: 1,045 tons, 11.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   8,570 lbs / 3,887 Kg = 17.1 x 10.0 " / 254 mm shells or 3.0 torpedoes
 Stability (Unstable if below 1.00): 1.48
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 11.8 seconds
 Steadiness - As gun platform (Average = 50 %): 71 %
   - Recoil effect (Restricted arc if above 1.00): 0.33
 Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
 Hull has a flush deck,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.667 / 0.672
 Length to Beam Ratio: 5.75 : 1
 'Natural speed' for length: 18.57 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 53
 Bow angle (Positive = bow angles forward): -7.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  19.00 ft / 5.79 m,  18.00 ft / 5.49 m
    - Forward deck: 30.00 %,  18.00 ft / 5.49 m,  17.00 ft / 5.18 m
    - Aft deck: 30.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Quarter deck: 20.00 %,  17.00 ft / 5.18 m,  18.00 ft / 5.49 m
    - Average freeboard:  17.53 ft / 5.34 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 153.3 %
  - Above water (accommodation/working, high = better): 113.2 %
 Waterplane Area: 16,105 Square feet or 1,496 Square metres
 Displacement factor (Displacement / loading): 93 %
 Structure weight / hull surface area: 96 lbs/sq ft or 469 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.63
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Adequate accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

GB/CA/1905 A2 Design

This is my GB/CA/1905 A2 armoured cruiser design. This is the sort of ship that would have been built if a dreadnought cruiser had not been built. My tweak was to not have superfiring 9.2in turrets on the beam, as they are not practical, in my view. This is the Springsharp report:

GB/CA/1905 A2 Design, Great Britain Armoured Cruiser laid down 1905 (Engine 1909)

Displacement:
 16,516 t light; 17,478 t standard; 20,663 t normal; 23,211 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (572.00 ft / 565.00 ft) x 80.00 ft x (25.00 / 27.60 ft)
 (174.35 m / 172.21 m) x 24.38 m  x (7.62 / 8.41 m)

Armament:
      16 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   2 x Twin mounts on centreline ends, evenly spread
   6 x Twin mounts on sides, evenly spread
      16 - 4.00" / 102 mm 50.0 cal guns - 31.99lbs / 14.51kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1905 Model
   16 x Single mounts on sides, evenly spread
  16 raised mounts
      Weight of broadside 6,592 lbs / 2,990 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 350.00 ft / 106.68 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 205.00 ft / 62.48 m 16.00 ft / 4.88 m
   10.00 ft / 3.05 m Unarmoured ends
   Main Belt covers 95 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 350.00 ft / 106.68 m 25.00 ft / 7.62 m
 Beam between torpedo bulkheads 48.00 ft / 14.63 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 5.00" / 127 mm  6.00" / 152 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 2.00" / 51 mm
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 6.00" / 152 mm, Aft 5.00" / 127 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 60,277 shp / 44,967 Kw = 25.50 kts
 Range 5,600nm at 16.00 kts
 Bunker at max displacement = 5,732 tons (100% coal)

Complement:
 861 - 1,120

Cost:
 £1.715 million / $6.860 million

Distribution of weights at normal displacement:
 Armament: 1,740 tons, 8.4 %
    - Guns: 1,740 tons, 8.4 %
 Armour: 5,606 tons, 27.1 %
    - Belts: 1,954 tons, 9.5 %
    - Torpedo bulkhead: 486 tons, 2.4 %
    - Armament: 1,710 tons, 8.3 %
    - Armour Deck: 1,278 tons, 6.2 %
    - Conning Towers: 178 tons, 0.9 %
 Machinery: 3,014 tons, 14.6 %
 Hull, fittings & equipment: 6,155 tons, 29.8 %
 Fuel, ammunition & stores: 4,147 tons, 20.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,739 lbs / 13,943 Kg = 79.0 x 9.2 " / 234 mm shells or 4.2 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 5.2 ft / 1.6 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 61 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.640 / 0.651
 Length to Beam Ratio: 7.06 : 1
 'Natural speed' for length: 23.77 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 51
 Bow angle (Positive = bow angles forward): -3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  26.00 ft / 7.92 m,  24.00 ft / 7.32 m
    - Forward deck: 30.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Aft deck: 18.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Quarter deck: 27.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
    - Average freeboard:  22.04 ft / 6.72 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 132.6 %
  - Above water (accommodation/working, high = better): 182.2 %
 Waterplane Area: 34,309 Square feet or 3,187 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 141 lbs/sq ft or 687 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.46
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

My latest attempt at the Ger/CB/1906 design

This is my Ger/CB/1906 design that dates from 1971. The ship was a German battlecruiser of nominally 33 knots and 8-12in guns. The protection is light to achieve the speed with a decent armament. This is the Springsharp report:

Ger/CB/1906, Germany Battlecruiser laid down 1906 (Engine 1911)

Displacement:
 26,585 t light; 27,623 t standard; 30,688 t normal; 33,140 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (807.00 ft / 800.00 ft) x 85.00 ft x (25.60 / 27.30 ft)
 (245.97 m / 243.84 m) x 25.91 m  x (7.80 / 8.32 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1906 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      8 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1906 Model
   8 x Single mounts on sides, forward deck aft
      Weight of broadside 7,886 lbs / 3,577 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 450.00 ft / 137.16 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 87 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 450.00 ft / 137.16 m 25.60 ft / 7.80 m
 Beam between torpedo bulkheads 58.00 ft / 17.68 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: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Protected deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 6.00" / 152 mm, Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 175,979 shp / 131,281 Kw = 32.80 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 5,517 tons

Complement:
 1,159 - 1,507

Cost:
 £2.677 million / $10.708 million

Distribution of weights at normal displacement:
 Armament: 1,509 tons, 4.9 %
    - Guns: 1,509 tons, 4.9 %
 Armour: 6,597 tons, 21.5 %
    - Belts: 1,305 tons, 4.3 %
    - Torpedo bulkhead: 639 tons, 2.1 %
    - Armament: 1,703 tons, 5.6 %
    - Armour Deck: 2,822 tons, 9.2 %
    - Conning Tower: 127 tons, 0.4 %
 Machinery: 7,142 tons, 23.3 %
 Hull, fittings & equipment: 11,337 tons, 36.9 %
 Fuel, ammunition & stores: 4,103 tons, 13.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   38,555 lbs / 17,488 Kg = 44.6 x 12.0 " / 305 mm shells or 4.1 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 5.2 ft / 1.6 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.617 / 0.625
 Length to Beam Ratio: 9.41 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 27.00 %,  29.00 ft / 8.84 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Aft deck: 14.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Quarter deck: 29.00 %,  19.00 ft / 5.79 m,  20.00 ft / 6.10 m
    - Average freeboard:  25.04 ft / 7.63 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 143.0 %
  - Above water (accommodation/working, high = better): 224.2 %
 Waterplane Area: 50,528 Square feet or 4,694 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 160 lbs/sq ft or 781 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.00
  - Longitudinal: 1.02
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

Another look at the British semi-Dreadnought: GB/BB/1903

The British almost built a class of battleships that were in the "semi-Dreadnought" category. They would have carried 4-12in and 12-9.2in guns. They were what the Lord Nelson and Agamenon should have been. This is the Springsharp report:

GB/BB/1903, Great Britain Battleship laid down 1903 (Engine 1908)

Displacement:
 18,189 t light; 19,180 t standard; 21,093 t normal; 22,623 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (483.00 ft / 475.00 ft) x 82.00 ft x (27.00 / 28.71 ft)
 (147.22 m / 144.78 m) x 24.99 m  x (8.23 / 8.75 m)

Armament:
      4 - 12.00" / 305 mm 45.0 cal guns - 850.00lbs / 385.55kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1903 Model
   2 x Twin mounts on centreline ends, evenly spread
      12 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1903 Model
   6 x Twin mounts on sides, evenly spread
      16 - 3.00" / 76.2 mm 50.0 cal guns - 14.29lbs / 6.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1903 Model
   16 x Single mounts on sides, evenly spread
  16 raised mounts
      Weight of broadside 8,189 lbs / 3,714 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 315.00 ft / 96.01 m 9.00 ft / 2.74 m
 Ends: 5.00" / 127 mm 160.00 ft / 48.77 m 16.00 ft / 4.88 m
 Upper: 9.00" / 229 mm 315.00 ft / 96.01 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 315.00 ft / 96.01 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 58.00 ft / 17.68 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: 10.0" / 254 mm 7.00" / 178 mm  10.0" / 254 mm
 3rd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 9.00" / 229 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 4 shafts, 21,257 ihp / 15,857 Kw = 19.00 kts
 Range 4,500nm at 14.00 kts
 Bunker at max displacement = 3,443 tons (100% coal)

Complement:
 874 - 1,137

Cost:
 £1.772 million / $7.089 million

Distribution of weights at normal displacement:
 Armament: 1,918 tons, 9.1 %
    - Guns: 1,918 tons, 9.1 %
 Armour: 8,378 tons, 39.7 %
    - Belts: 3,019 tons, 14.3 %
    - Torpedo bulkhead: 629 tons, 3.0 %
    - Armament: 2,635 tons, 12.5 %
    - Armour Deck: 1,749 tons, 8.3 %
    - Conning Towers: 345 tons, 1.6 %
 Machinery: 1,932 tons, 9.2 %
 Hull, fittings & equipment: 5,961 tons, 28.3 %
 Fuel, ammunition & stores: 2,904 tons, 13.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,266 lbs / 13,728 Kg = 35.0 x 12.0 " / 305 mm shells or 5.1 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 16.1 seconds
 Steadiness - As gun platform (Average = 50 %): 79 %
   - Recoil effect (Restricted arc if above 1.00): 0.76
 Seaboat quality  (Average = 1.00): 1.59

Hull form characteristics:
 Hull has a flush deck,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.702 / 0.708
 Length to Beam Ratio: 5.79 : 1
 'Natural speed' for length: 21.79 kts
 Power going to wave formation at top speed: 48 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  22.00 ft / 6.71 m,  21.00 ft / 6.40 m
    - Forward deck: 30.00 %,  21.00 ft / 6.40 m,  19.00 ft / 5.79 m
    - Aft deck: 30.00 %,  19.00 ft / 5.79 m,  20.00 ft / 6.10 m
    - Quarter deck: 20.00 %,  20.00 ft / 6.10 m,  21.00 ft / 6.40 m
    - Average freeboard:  20.23 ft / 6.17 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 95.4 %
  - Above water (accommodation/working, high = better): 134.6 %
 Waterplane Area: 31,275 Square feet or 2,906 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 154 lbs/sq ft or 752 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.93
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

A well-protected battlecruiser: GB/CB/1905

I still do not see any reason why there could not be a well-protected British battlecruiser laid down in 1905. The ship has coal-fired boilers and direct-drive turbines. The belt is 10in and the deck in 3in. The four turrets are distributed on the centerline, with one forward and one aft. The 16-4in QF guns are stacked casemates with 4in protection. The speed is 25 knots. This is the Springsharp report:

GB/CB/1905, Great Britain Battlecruiser laid down 1905 (Engine 1909)

Displacement:
 20,474 t light; 21,583 t standard; 24,985 t normal; 27,707 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (642.00 ft / 634.00 ft) x 82.00 ft x (27.00 / 29.45 ft)
 (195.68 m / 193.24 m) x 24.99 m  x (8.23 / 8.98 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 850.00lbs / 385.55kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   4 x Twin mounts on centreline, evenly spread
      16 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Breech loading guns in casemate mounts, 1905 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,312 lbs / 3,317 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 420.00 ft / 128.02 m 9.00 ft / 2.74 m
 Ends: 4.00" / 102 mm 114.00 ft / 34.75 m 12.00 ft / 3.66 m
   100.00 ft / 30.48 m Unarmoured ends
 Upper: 7.00" / 178 mm 420.00 ft / 128.02 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 420.00 ft / 128.02 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 62.00 ft / 18.90 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 8.00" / 203 mm  10.0" / 254 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 10.00" / 254 mm, Aft 7.00" / 178 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 58,942 shp / 43,971 Kw = 25.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 6,124 tons (100% coal)

Complement:
 993 - 1,291

Cost:
 £1.805 million / $7.219 million

Distribution of weights at normal displacement:
 Armament: 1,320 tons, 5.3 %
    - Guns: 1,320 tons, 5.3 %
 Armour: 8,087 tons, 32.4 %
    - Belts: 2,801 tons, 11.2 %
    - Torpedo bulkhead: 839 tons, 3.4 %
    - Armament: 1,964 tons, 7.9 %
    - Armour Deck: 2,170 tons, 8.7 %
    - Conning Towers: 313 tons, 1.3 %
 Machinery: 2,947 tons, 11.8 %
 Hull, fittings & equipment: 8,119 tons, 32.5 %
 Fuel, ammunition & stores: 4,511 tons, 18.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   45,024 lbs / 20,422 Kg = 52.1 x 12.0 " / 305 mm shells or 6.8 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 4.9 ft / 1.5 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 80 %
   - Recoil effect (Restricted arc if above 1.00): 0.77
 Seaboat quality  (Average = 1.00): 1.60

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.623 / 0.633
 Length to Beam Ratio: 7.73 : 1
 'Natural speed' for length: 25.18 kts
 Power going to wave formation at top speed: 49 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Aft deck: 17.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 28.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  23.86 ft / 7.27 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 85.0 %
  - Above water (accommodation/working, high = better): 193.7 %
 Waterplane Area: 38,846 Square feet or 3,609 Square metres
 Displacement factor (Displacement / loading): 122 %
 Structure weight / hull surface area: 148 lbs/sq ft or 723 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.57
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

I am a bit disappointed with the latest Springsharp beta

The latest Springsharp beta still does not allow me to have higher power output machinery. As far back as a 1905 design (HMS Swift), the British were able to achieve a 60 SHP/ton of machinery weight propulsion plant. Admittedly, that was with the machinery being stressed, but I do not believe overly so. I cannot find a way to do better than 50 SHP/ton and I believe that the power required is too great for the size of ship. All you have to do is consult a Conways and look at the British Tribal class destroyerss bujild from 1937 and later. For a nominal 44,000 SHP, the could reach a nominal speed of 36.25 to 36.5 knots. For a comparably-sized ship, Springsharp requires an absurd 78,440 SHP to reach 37 knots. This is the Springsharp report:

Super Swift, Great Britain Scout Cruiser laid down 1912 (Engine 1950)

Displacement:
 2,225 t light; 2,291 t standard; 2,445 t normal; 2,568 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (380.73 ft / 378.00 ft) x 37.00 ft x (13.75 / 14.24 ft)
 (116.05 m / 115.21 m) x 11.28 m  x (4.19 / 4.34 m)

Armament:
      6 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1912 Model
   2 x Single mounts on centreline ends, evenly spread
   4 x Single mounts on sides, forward deck aft
      Weight of broadside 203 lbs / 92 kg
      Main Torpedoes
      2 - 18.0" / 457 mm, 21.00 ft / 6.40 m torpedoes - 0.905 t each, 1.810 t total
 In 2 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 78,440 shp / 58,517 Kw = 37.00 kts
 Range 3,750nm at 14.00 kts
 Bunker at max displacement = 277 tons

Complement:
 173 - 226

Cost:
 £0.304 million / $1.216 million

Distribution of weights at normal displacement:
 Armament: 66 tons, 2.7 %
    - Guns: 62 tons, 2.6 %
    - Weapons: 4 tons, 0.1 %
 Armour: 37 tons, 1.5 %
    - Armament: 37 tons, 1.5 %
 Machinery: 1,460 tons, 59.7 %
 Hull, fittings & equipment: 662 tons, 27.1 %
 Fuel, ammunition & stores: 220 tons, 9.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   510 lbs / 232 Kg = 15.9 x 4.0 " / 102 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.31
 Metacentric height 1.8 ft / 0.6 m
 Roll period: 11.5 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.26
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.445 / 0.451
 Length to Beam Ratio: 10.22 : 1
 'Natural speed' for length: 19.44 kts
 Power going to wave formation at top speed: 71 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 6.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 16.00 %,  26.00 ft / 7.92 m,  24.00 ft / 7.32 m
    - Forward deck: 18.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Aft deck: 51.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
    - Quarter deck: 15.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
    - Average freeboard:  18.85 ft / 5.74 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 200.6 %
  - Above water (accommodation/working, high = better): 145.1 %
 Waterplane Area: 8,885 Square feet or 825 Square metres
 Displacement factor (Displacement / loading): 61 %
 Structure weight / hull surface area: 34 lbs/sq ft or 167 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 2.79
  - Overall: 0.51
 Extremely poor machinery, storage, compartmentation space
 Excellent accommodation and workspace room

The battlecruiser analog of the GB/BB/1906: the GB/CB/1906

The battlecruiser version of the GB/BB/1906 naturally has lighter armour and higher speed. The lower belt is still 8in thick, so it is not another Invincible. The speed is also higher at 27 knots (although I had heard that an invincible might be able to make higher speed). The ships have 8-12in/45 and 16-4in QF guns. This is the Springsharp report:

\GB/BB/1906, Great Britain Battlecruiser laid down 1906 (Engine 1911)

Displacement:
 20,854 t light; 21,808 t standard; 26,192 t normal; 29,700 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (645.00 ft / 638.00 ft) x 82.00 ft x (27.00 / 30.07 ft)
 (196.60 m / 194.46 m) x 24.99 m  x (8.23 / 9.16 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 100 per gun
   Breech loading guns in turret on barbette mounts, 1906 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,487 lbs / 3,396 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 430.00 ft / 131.06 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 6.00" / 152 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m
   Main Belt covers 104 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 430.00 ft / 131.06 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 56.00 ft / 17.07 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 8.00" / 203 mm  10.0" / 254 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 2.00" / 51 mm
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 11.00" / 279 mm, Aft 8.00" / 203 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 82,731 shp / 61,717 Kw = 27.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 7,891 tons (100% coal)

Complement:
 1,029 - 1,338

Cost:
 £1.923 million / $7.691 million

Distribution of weights at normal displacement:
 Armament: 1,331 tons, 5.1 %
    - Guns: 1,331 tons, 5.1 %
 Armour: 7,070 tons, 27.0 %
    - Belts: 2,188 tons, 8.4 %
    - Torpedo bulkhead: 859 tons, 3.3 %
    - Armament: 2,171 tons, 8.3 %
    - Armour Deck: 1,491 tons, 5.7 %
    - Conning Towers: 361 tons, 1.4 %
 Machinery: 3,693 tons, 14.1 %
 Hull, fittings & equipment: 8,759 tons, 33.4 %
 Fuel, ammunition & stores: 5,338 tons, 20.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   42,557 lbs / 19,303 Kg = 49.3 x 12.0 " / 305 mm shells or 6.1 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.82
 Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.649 / 0.661
 Length to Beam Ratio: 7.78 : 1
 'Natural speed' for length: 25.26 kts
 Power going to wave formation at top speed: 53 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  29.00 ft / 8.84 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Aft deck: 14.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 31.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  24.12 ft / 7.35 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 102.2 %
  - Above water (accommodation/working, high = better): 195.2 %
 Waterplane Area: 40,040 Square feet or 3,720 Square metres
 Displacement factor (Displacement / loading): 125 %
 Structure weight / hull surface area: 155 lbs/sq ft or 758 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.52
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

My 1906 British fast battleship

I have had a concept for a British fast battleship for 1906. The boilers are coal-fired and the machinery is direct-drive turbines. I like to use a good bit of length to achieve speed, to keep other characteristics in check. This is a ship with 8-12in/45 and 16-4in QF guns. The armour basis is 10in with a 2in deck. Since the tiny Michigan and South Carolina had superfiring guns, I figure that the ships should have them as well. The "all-or-nothing" armour scheme is rather edgy, I admit. This is the Springsharp report:

GB/BB/1906, Great Britain Battleship laid down 1906 (Engine 1911)

Displacement:
 19,696 t light; 20,703 t standard; 24,948 t normal; 28,343 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (635.00 ft / 628.00 ft) x 82.00 ft x (27.00 / 30.07 ft)
 (193.55 m / 191.41 m) x 24.99 m  x (8.23 / 9.17 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1906 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,487 lbs / 3,396 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 410.00 ft / 124.97 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 410.00 ft / 124.97 m 8.00 ft / 2.44 m
   Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 410.00 ft / 124.97 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 56.00 ft / 17.07 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 11.0" / 279 mm 9.00" / 229 mm  11.0" / 279 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 2.00" / 51 mm
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 11.00" / 279 mm, Aft 8.00" / 203 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 50,568 shp / 37,724 Kw = 24.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 7,640 tons (100% coal)

Complement:
 992 - 1,290

Cost:
 £1.681 million / $6.724 million

Distribution of weights at normal displacement:
 Armament: 1,331 tons, 5.3 %
    - Guns: 1,331 tons, 5.3 %
 Armour: 7,625 tons, 30.6 %
    - Belts: 2,694 tons, 10.8 %
    - Torpedo bulkhead: 819 tons, 3.3 %
    - Armament: 2,323 tons, 9.3 %
    - Armour Deck: 1,439 tons, 5.8 %
    - Conning Towers: 349 tons, 1.4 %
 Machinery: 2,257 tons, 9.0 %
 Hull, fittings & equipment: 8,483 tons, 34.0 %
 Fuel, ammunition & stores: 5,251 tons, 21.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   50,065 lbs / 22,709 Kg = 57.9 x 12.0 " / 305 mm shells or 8.4 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 4.4 ft / 1.3 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 81 %
   - Recoil effect (Restricted arc if above 1.00): 0.95
 Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.628 / 0.641
 Length to Beam Ratio: 7.66 : 1
 'Natural speed' for length: 25.06 kts
 Power going to wave formation at top speed: 47 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  28.00 ft / 8.53 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  25.00 ft / 7.62 m
    - Aft deck: 14.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 31.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Average freeboard:  23.12 ft / 7.05 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 80.7 %
  - Above water (accommodation/working, high = better): 188.1 %
 Waterplane Area: 38,657 Square feet or 3,591 Square metres
 Displacement factor (Displacement / loading): 134 %
 Structure weight / hull surface area: 157 lbs/sq ft or 765 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.57
  - Overall: 1.00
 Excellent machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

GB/CB/1914: my first Springsharp 3.0 3rd Beta design

I finally downloaded the third Springsharp 3.0 3rd Beta version. I decided to try the large, fast battlecruiser with 12in armour: the GB/CB/1914. This is a design that is more archaic looking than the Hood, but a stronger and more heavily armed ship:

GB/CB/1914, Great Britain Battlecruiser laid down 1914 (Engine 1921)

Displacement:
 40,459 t light; 42,785 t standard; 45,940 t normal; 48,465 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (821.00 ft / 814.00 ft) x 108.00 ft x (31.00 / 32.39 ft)
 (250.24 m / 248.11 m) x 32.92 m  x (9.45 / 9.87 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,920.01lbs / 870.90kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1914 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, forward deck aft
      14 - 6.00" / 152 mm 45.0 cal guns - 108.93lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1914 Model
   14 x Single mounts on sides, evenly spread
  14 hull mounts in casemates- Limited use in heavy seas
      Weight of broadside 20,725 lbs / 9,401 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 570.00 ft / 173.74 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 570.00 ft / 173.74 m 8.00 ft / 2.44 m
   Main Belt covers 108 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 570.00 ft / 173.74 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 86.00 ft / 26.21 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 4.00" / 102 mm  5.00" / 127 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 160,033 shp / 119,385 Kw = 30.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 5,680 tons

Complement:
 1,568 - 2,039

Cost:
 £4.688 million / $18.752 million

Distribution of weights at normal displacement:
 Armament: 2,794 tons, 6.1 %
    - Guns: 2,794 tons, 6.1 %
 Armour: 14,133 tons, 30.8 %
    - Belts: 4,307 tons, 9.4 %
    - Torpedo bulkhead: 1,308 tons, 2.8 %
    - Armament: 4,380 tons, 9.5 %
    - Armour Deck: 3,557 tons, 7.7 %
    - Conning Towers: 580 tons, 1.3 %
 Machinery: 5,511 tons, 12.0 %
 Hull, fittings & equipment: 18,021 tons, 39.2 %
 Fuel, ammunition & stores: 5,481 tons, 11.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   74,422 lbs / 33,757 Kg = 44.1 x 15.0 " / 381 mm shells or 11.0 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.84
 Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.590 / 0.596
 Length to Beam Ratio: 7.54 : 1
 'Natural speed' for length: 28.53 kts
 Power going to wave formation at top speed: 51 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  31.00 ft / 9.45 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  28.00 ft / 8.53 m
    - Aft deck: 14.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Quarter deck: 31.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  26.12 ft / 7.96 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 88.0 %
  - Above water (accommodation/working, high = better): 219.3 %
 Waterplane Area: 63,699 Square feet or 5,918 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 212 lbs/sq ft or 1,036 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.37
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

The new Springsharp Beta is available

I just received an email from Ian Ross-Gowan saying that the third Beta of Springsharp is now available for download.

The CSS Virginia photo

I have my CSS Virginia photograph posted at the "My Victorian Navy" blog along with the specs.

The GB/CA/1906 design

I am not sure why this ship now works so well, but it does. This is the alternative to the armoured cruisers actually built. The armament is 16-9.2in/50 and 16-4in QF guns. The armour basis is 6in, with a 2in deck. The speed is 25.5 knots. The ship is powered by steam turbines and the boilers are coal-fired. The photograph is of one of these ships. This is the Springsharp report:

GB/CA/1906, Great Britain Armoured Cruiser laid down 1906 (Engine 1911)

Displacement:
 16,589 t light; 17,545 t standard; 20,283 t normal; 22,474 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (587.00 ft / 580.00 ft) x 80.00 ft x (25.00 / 27.23 ft)
 (178.92 m / 176.78 m) x 24.38 m  x (7.62 / 8.30 m)

Armament:
      4 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1906 Model
   2 x Twin mounts on centreline ends, evenly spread
      12 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1906 Model
   6 x Twin mounts on sides, forward deck aft
  2 raised mounts - superfiring
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   16 x Single mounts on sides, evenly spread
  4 raised mounts
      Weight of broadside 6,596 lbs / 2,992 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 405.00 ft / 123.44 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 175.00 ft / 53.34 m 16.00 ft / 4.88 m
   Main Belt covers 107 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 405.00 ft / 123.44 m 25.00 ft / 7.62 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: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 3rd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 2.00" / 51 mm For and Aft decks
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 6.00" / 152 mm,  Aft 0.00" / 0 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 58,126 shp / 43,362 Kw = 25.50 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 4,930 tons (100% coal)

Complement:
 849 - 1,104

Cost:
 £1.655 million / $6.619 million

Distribution of weights at normal displacement:
 Armament: 1,725 tons, 8.5 %
 Armour: 5,550 tons, 27.4 %
    - Belts: 2,061 tons, 10.2 %
    - Torpedo bulkhead: 375 tons, 1.8 %
    - Armament: 1,739 tons, 8.6 %
    - Armour Deck: 1,279 tons, 6.3 %
    - Conning Tower: 96 tons, 0.5 %
 Machinery: 2,595 tons, 12.8 %
 Hull, fittings & equipment: 6,720 tons, 33.1 %
 Fuel, ammunition & stores: 3,694 tons, 18.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   32,664 lbs / 14,816 Kg = 83.9 x 9.2 " / 234 mm shells or 4.5 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 4.7 ft / 1.4 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 67 %
   - Recoil effect (Restricted arc if above 1.00): 0.76
 Seaboat quality  (Average = 1.00): 1.34

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.612 / 0.622
 Length to Beam Ratio: 7.25 : 1
 'Natural speed' for length: 24.08 kts
 Power going to wave formation at top speed: 53 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  25.00 ft / 7.62 m
    - Aft deck: 22.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 28.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Average freeboard:  23.19 ft / 7.07 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 99.0 %
  - Above water (accommodation/working, high = better): 194.7 %
 Waterplane Area: 34,318 Square feet or 3,188 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 149 lbs/sq ft or 727 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
 Good seaboat, rides out heavy weather easily

"HMS Unapproachable": a new attempt

After looking at this photograph again, I decided to see if I could make a reasonable Springsharp design for the original concept: 4-9.2in, 12-7.5in, and possibly 16-4in guns. The ship is based on the sketch in Dr. Oscar Parkes' book British Battleships. The ship can fire 2-9.2 and 8-7.5 guns forward and aft, if blast effects are accepted. The broadside is 4-9.2in and 6-7.5in guns. A not-so minor detail is that the original concept may have had reciprocating engines,but I don't think that it is too great a stretch to use steam turbines. This is the Springsharp report:

Unapproachable, Great Britain Armoured Cruiser laid down 1904 (Engine 1909)

Displacement:
 14,711 t light; 15,446 t standard; 18,283 t normal; 20,552 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (572.00 ft / 565.00 ft) x 78.00 ft x (24.00 / 26.45 ft)
 (174.35 m / 172.21 m) x 23.77 m  x (7.32 / 8.06 m)

Armament:
      4 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1904 Model
   2 x Twin mounts on centreline ends, evenly spread
      12 - 7.50" / 191 mm 50.0 cal guns - 200.00lbs / 90.72kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1904 Model
   6 x Twin mounts on sides, evenly spread
  6 raised mounts
      16 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1904 Model
   16 x Single mounts on sides amidships
  16 raised mounts
      Weight of broadside 4,432 lbs / 2,010 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 410.00 ft / 124.97 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 155.00 ft / 47.24 m 16.00 ft / 4.88 m
   Main Belt covers 112 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 410.00 ft / 124.97 m 24.00 ft / 7.32 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: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm
 3rd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 2.00" / 51 mm For and Aft decks
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 6.00" / 152 mm,  Aft 0.00" / 0 mm

Machinery:
 Coal fired boilers, steam turbines,
 Direct drive, 4 shafts, 50,795 shp / 37,893 Kw = 25.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 5,105 tons (100% coal)

Complement:
 785 - 1,021

Cost:
 £1.346 million / $5.386 million

Distribution of weights at normal displacement:
 Armament: 1,170 tons, 6.4 %
 Armour: 5,064 tons, 27.7 %
    - Belts: 2,020 tons, 11.0 %
    - Torpedo bulkhead: 364 tons, 2.0 %
    - Armament: 1,382 tons, 7.6 %
    - Armour Deck: 1,208 tons, 6.6 %
    - Conning Tower: 90 tons, 0.5 %
 Machinery: 2,540 tons, 13.9 %
 Hull, fittings & equipment: 5,938 tons, 32.5 %
 Fuel, ammunition & stores: 3,571 tons, 19.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   29,620 lbs / 13,435 Kg = 76.1 x 9.2 " / 234 mm shells or 4.5 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 15.2 seconds
 Steadiness - As gun platform (Average = 50 %): 66 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.605 / 0.617
 Length to Beam Ratio: 7.24 : 1
 'Natural speed' for length: 23.77 kts
 Power going to wave formation at top speed: 52 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  24.00 ft / 7.32 m,  23.00 ft / 7.01 m
    - Forward deck: 30.00 %,  23.00 ft / 7.01 m,  21.00 ft / 6.40 m
    - Aft deck: 35.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
    - Quarter deck: 15.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  21.63 ft / 6.59 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 93.8 %
  - Above water (accommodation/working, high = better): 168.6 %
 Waterplane Area: 32,383 Square feet or 3,008 Square metres
 Displacement factor (Displacement / loading): 125 %
 Structure weight / hull surface area: 138 lbs/sq ft or 671 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.49
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

My early concept for a large German battleship: the Ger/BB/1940

When I was young and had not seen the specifications for the German battleship Bismarck, I had my own concept for what the ship would be like. It would be at least 900ft long and have 16in guns. Ten guns seemed like a good number, although I should have known that the Bismarck had only eight large guns. This is my attempt at recreating my original design concept:

Ger/BB/1940, Germany Battleship laid down 1940

Displacement:
 63,666 t light; 67,025 t standard; 73,315 t normal; 78,347 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (934.70 ft / 920.00 ft) x 130.00 ft x (35.00 / 36.99 ft)
 (284.90 m / 280.42 m) x 39.62 m  x (10.67 / 11.27 m)

Armament:
      10 - 16.00" / 406 mm 45.0 cal guns - 2,065.00lbs / 936.67kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1940 Model
   2 x Triple mounts on centreline ends, evenly spread
   2 x Twin mounts on centreline ends, evenly spread
  2 raised mounts
      12 - 6.00" / 152 mm 55.0 cal guns - 115.00lbs / 52.16kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1940 Model
   6 x Twin mounts on sides, forward deck aft
      16 - 4.10" / 104 mm 55.0 cal guns - 37.20lbs / 16.87kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts, 1940 Model
   8 x Twin mounts on sides, aft deck forward
  8 raised mounts
      48 - 1.46" / 37.0 mm 60.0 cal guns - 1.69lbs / 0.77kg shells, 150 per gun
   Anti-air guns in deck mounts, 1940 Model
   24 x Single mounts on sides, evenly spread
  16 raised mounts
      Weight of broadside 22,706 lbs / 10,299 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 16.0" / 406 mm 610.00 ft / 185.93 m 16.00 ft / 4.88 m
 Ends: 6.00" / 152 mm 310.00 ft / 94.49 m 16.00 ft / 4.88 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead:
  6.00" / 152 mm 610.00 ft / 185.93 m 35.00 ft / 10.67 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 16.0" / 406 mm 12.0" / 305 mm  16.0" / 406 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

   - Armoured deck - multiple decks: 6.00" / 152 mm For and Aft decks
 Forecastle: 6.00" / 152 mm  Quarter deck: 6.00" / 152 mm

   - Conning towers: Forward 16.00" / 406 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 208,569 shp / 155,592 Kw = 30.00 kts
 Range 12,000nm at 17.00 kts
 Bunker at max displacement = 11,322 tons

Complement:
 2,227 - 2,896

Cost:
 £31.038 million / $124.154 million

Distribution of weights at normal displacement:
 Armament: 3,929 tons, 5.4 %
 Armour: 29,117 tons, 39.7 %
    - Belts: 7,807 tons, 10.6 %
    - Torpedo bulkhead: 4,740 tons, 6.5 %
    - Armament: 6,058 tons, 8.3 %
    - Armour Deck: 9,908 tons, 13.5 %
    - Conning Tower: 604 tons, 0.8 %
 Machinery: 5,577 tons, 7.6 %
 Hull, fittings & equipment: 25,044 tons, 34.2 %
 Fuel, ammunition & stores: 9,648 tons, 13.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   147,419 lbs / 66,868 Kg = 72.0 x 16.0 " / 406 mm shells or 35.3 torpedoes
 Stability (Unstable if below 1.00): 1.25
 Metacentric height 11.2 ft / 3.4 m
 Roll period: 16.3 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.41
 Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.613 / 0.620
 Length to Beam Ratio: 7.08 : 1
 'Natural speed' for length: 30.33 kts
 Power going to wave formation at top speed: 50 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 17.00 degrees
 Stern overhang: 4.00 ft / 1.22 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  35.00 ft / 10.67 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  26.00 ft / 7.92 m
    - Aft deck: 35.00 %,  26.00 ft / 7.92 m,  25.00 ft / 7.62 m
    - Quarter deck: 15.00 %,  25.00 ft / 7.62 m,  26.00 ft / 7.92 m
    - Average freeboard:  27.28 ft / 8.31 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 62.7 %
  - Above water (accommodation/working, high = better): 200.1 %
 Waterplane Area: 88,540 Square feet or 8,226 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 222 lbs/sq ft or 1,082 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.14
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

Why is this so good? (i.e., what is wrong with it?)

My design for a US/CL/1941 design is so good, I have to ask "what did I do wrong?" The design seems too good to be true. The ship carries 15-6in QF, 12-5in DP, and 48-40mm AA gus at a speed of 35 knots. The range is 8,500nm at 17 knots. I would think that the protection is adequate, by the standard of ships actually built. This is the Springsharp report:

US/CL/1941, United States Light Cruiser laid down 1941 (Engine 1950)

Displacement:
 13,114 t light; 13,632 t standard; 15,286 t normal; 16,609 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (660.91 ft / 654.00 ft) x 67.00 ft x (22.00 / 23.45 ft)
 (201.45 m / 199.34 m) x 20.42 m  x (6.71 / 7.15 m)

Armament:
      15 - 6.00" / 152 mm 55.0 cal guns - 116.57lbs / 52.88kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1941 Model
   5 x Triple mounts on centreline ends, majority forward
  2 raised mounts - superfiring
      12 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 150 per gun
   Dual purpose guns in deck and hoist mounts, 1941 Model
   6 x Twin mounts on sides, forward deck aft
  2 raised mounts - superfiring
      48 - 1.57" / 40.0 mm 55.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun
   Anti-air guns in deck mounts, 1941 Model
   8 x Quad mounts on sides, aft deck forward
  4 raised mounts - superfiring
      Weight of broadside 2,557 lbs / 1,160 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 435.00 ft / 132.59 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:
  0.80" / 20 mm 435.00 ft / 132.59 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: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

   - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 4.00" / 102 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 135,115 shp / 100,796 Kw = 35.00 kts
 Range 8,500nm at 17.00 kts
 Bunker at max displacement = 2,977 tons

Complement:
 686 - 893

Cost:
 £7.285 million / $29.140 million

Distribution of weights at normal displacement:
 Armament: 651 tons, 4.3 %
 Armour: 3,541 tons, 23.2 %
    - Belts: 861 tons, 5.6 %
    - Torpedo bulkhead: 283 tons, 1.9 %
    - Armament: 553 tons, 3.6 %
    - Armour Deck: 1,790 tons, 11.7 %
    - Conning Tower: 53 tons, 0.3 %
 Machinery: 3,232 tons, 21.1 %
 Hull, fittings & equipment: 5,689 tons, 37.2 %
 Fuel, ammunition & stores: 2,173 tons, 14.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   22,862 lbs / 10,370 Kg = 211.7 x 6.0 " / 152 mm shells or 2.9 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 15.3 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.52
 Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and large transom stern
 Block coefficient (normal/deep): 0.555 / 0.566
 Length to Beam Ratio: 9.76 : 1
 'Natural speed' for length: 29.06 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  31.00 ft / 9.45 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  23.00 ft / 7.01 m
    - Aft deck: 35.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  24.00 ft / 7.32 m
    - Average freeboard:  24.53 ft / 7.48 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 121.5 %
  - Above water (accommodation/working, high = better): 210.4 %
 Waterplane Area: 31,990 Square feet or 2,972 Square metres
 Displacement factor (Displacement / loading): 122 %
 Structure weight / hull surface area: 116 lbs/sq ft or 568 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.60
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

A GB/CA/1921 design

This is another attempt at a fast, British 1921-style heavy armoured cruiser. The ship has 9-10in/50, 16-5.5in/50 QF, 6-4.7in AA, and 24-2pdr AA guns. The armour basis is 8in. This is the Springsharp report:

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

Displacement:
 24,231 t light; 25,234 t standard; 26,899 t normal; 28,230 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (760.07 ft / 755.00 ft) x 88.00 ft x (26.00 / 26.99 ft)
 (231.67 m / 230.12 m) x 26.82 m  x (7.92 / 8.23 m)

Armament:
      9 - 10.00" / 254 mm 50.0 cal guns - 529.32lbs / 240.10kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1921 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      16 - 5.50" / 140 mm 50.0 cal guns - 88.07lbs / 39.95kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1921 Model
   8 x Twin mounts on sides, aft deck forward
  4 raised mounts - superfiring
      6 - 4.70" / 119 mm 45.0 cal guns - 52.35lbs / 23.75kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts, 1921 Model
   6 x Single mounts on sides, forward deck aft
  6 raised mounts
      24 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 150 per gun
   Anti-air guns in deck mounts, 1921 Model
   6 x 2 row quad mounts on sides, evenly spread
  6 raised mounts
      Weight of broadside 6,534 lbs / 2,964 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 435.00 ft / 132.59 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 89 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 435.00 ft / 132.59 m 26.00 ft / 7.92 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: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 8.00" / 203 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 173,434 shp / 129,382 Kw = 34.00 kts
 Range 5,400nm at 17.00 kts
 Bunker at max displacement = 2,996 tons

Complement:
 1,049 - 1,365

Cost:
 £5.593 million / $22.373 million

Distribution of weights at normal displacement:
 Armament: 1,632 tons, 6.1 %
 Armour: 7,509 tons, 27.9 %
    - Belts: 2,386 tons, 8.9 %
    - Torpedo bulkhead: 418 tons, 1.6 %
    - Armament: 1,904 tons, 7.1 %
    - Armour Deck: 2,646 tons, 9.8 %
    - Conning Tower: 155 tons, 0.6 %
 Machinery: 4,807 tons, 17.9 %
 Hull, fittings & equipment: 10,284 tons, 38.2 %
 Fuel, ammunition & stores: 2,668 tons, 9.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   39,909 lbs / 18,103 Kg = 79.8 x 10.0 " / 254 mm shells or 4.9 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 5.0 ft / 1.5 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.53
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and small transom stern
 Block coefficient (normal/deep): 0.545 / 0.551
 Length to Beam Ratio: 8.58 : 1
 'Natural speed' for length: 29.60 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  32.00 ft / 9.75 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  28.00 ft / 8.53 m,  25.00 ft / 7.62 m
    - Aft deck: 35.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 15.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Average freeboard:  26.37 ft / 8.04 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 105.3 %
  - Above water (accommodation/working, high = better): 220.6 %
 Waterplane Area: 47,286 Square feet or 4,393 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 159 lbs/sq ft or 775 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.34
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

I was interested to read about A.P. Tulley's research

John W. Fox, on the NavWarGames Yahoo Group, pointed out a good article by A.P. Tulley about how the mystery surrounding the loss of the Japanese battleship Kongo was solved. My research is about the 1650's and the Dutch navy, but I can relate to Tully's persistence in solving the mystery about the Kongo's loss. Not many writers even realized that there was a mystery.

A Belted Cruiser: the GB/CA/1905

I have been thinking a lot about 1880's design standards. One thread of development in that period were belted cruisers. They had a relatively thick, but narrow belt of armour. That was the main protection, although there would have been some deck armour, as well. My design has 8-9.2in/50 BLR and 16-4in QF guns. The belt is just 10ft wide, but is 8in thick. The speed is a more modern 25 knots. This is the Springsharp report:

GB/CA/1905, Great Britain Belted Cruiser laid down 1905 (Engine 1910)

Displacement:
 10,209 t light; 10,764 t standard; 12,948 t normal; 14,694 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (492.00 ft / 485.00 ft) x 65.00 ft x (25.00 / 27.71 ft)
 (149.96 m / 147.83 m) x 19.81 m  x (7.62 / 8.45 m)

Armament:
      8 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   2 x Twin mounts on centreline ends, evenly spread
   2 x Twin mounts on sides amidships
   Aft Main mounts separated by engine room
      16 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1905 Model
   16 x Single mounts on sides amidships
  8 raised mounts
      Weight of broadside 3,552 lbs / 1,611 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 390.00 ft / 118.87 m 10.00 ft / 3.05 m
 Ends: Unarmoured
   Main Belt covers 124 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 390.00 ft / 118.87 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 7.00" / 178 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 2.00" / 51 mm For and Aft decks
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 5.00" / 127 mm,  Aft 0.00" / 0 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 42,596 shp / 31,776 Kw = 25.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 3,930 tons (100% coal)

Complement:
 606 - 788

Cost:
 £0.996 million / $3.985 million

Distribution of weights at normal displacement:
 Armament: 909 tons, 7.0 %
 Armour: 3,453 tons, 26.7 %
    - Belts: 1,275 tons, 9.8 %
    - Torpedo bulkhead: 361 tons, 2.8 %
    - Armament: 919 tons, 7.1 %
    - Armour Deck: 838 tons, 6.5 %
    - Conning Tower: 59 tons, 0.5 %
 Machinery: 1,936 tons, 15.0 %
 Hull, fittings & equipment: 3,912 tons, 30.2 %
 Fuel, ammunition & stores: 2,738 tons, 21.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   20,351 lbs / 9,231 Kg = 52.3 x 9.2 " / 234 mm shells or 3.1 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 3.5 ft / 1.1 m
 Roll period: 14.6 seconds
 Steadiness - As gun platform (Average = 50 %): 69 %
   - Recoil effect (Restricted arc if above 1.00): 0.76
 Seaboat quality  (Average = 1.00): 1.37

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.575 / 0.589
 Length to Beam Ratio: 7.46 : 1
 'Natural speed' for length: 22.02 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: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  26.00 ft / 7.92 m,  24.00 ft / 7.32 m
    - Forward deck: 30.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Aft deck: 13.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Quarter deck: 32.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
    - Average freeboard:  21.64 ft / 6.60 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 108.8 %
  - Above water (accommodation/working, high = better): 169.9 %
 Waterplane Area: 22,523 Square feet or 2,092 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 119 lbs/sq ft or 583 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.19
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily