A 40-knot Ger/CBL/1915 Mod.A a2

This is the even faster version of the Ger/CBL/1915 Mod.A (a2) that can make 40 knots. The armor is reduced, for one thing, the draft and displacement were increased, as well. The seakeeping was improved by raising the freeboard and the strength was brought up to where it needed to be by the draft and displacement increases. The increased hull depth also helped. This is the Springsharp report:

Ger/CBL/1915 Mod.A a2, Great Britain Battlecruiser laid down 1915 (Engine 1950)

Displacement:
 19,372 t light; 19,922 t standard; 20,750 t normal; 21,412 t full load

Dimensions: Length overall / water x beam x draught
 803.19 ft / 800.00 ft x 80.00 ft x 25.00 ft (normal load)
 244.81 m / 243.84 m x 24.38 m  x 7.62 m

Armament:
      2 - 12.00" / 305 mm guns (1x2 guns), 864.00lbs / 391.90kg shells, 1915 Model
   Breech loading guns in a turret (on a barbette)
   on centreline forward
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 3,024 lbs / 1,372 kg
 Shells per gun, main battery: 75

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 620.00 ft / 188.98 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 119 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 620.00 ft / 188.98 m 20.00 ft / 6.10 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  5.00" / 127 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 1.00" / 25 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 282,457 shp / 210,713 Kw = 40.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,491 tons

Complement:
 863 - 1,123

Cost:
 £2.824 million / $11.296 million

Distribution of weights at normal displacement:
 Armament: 378 tons, 1.8 %
 Armour: 2,802 tons, 13.5 %
    - Belts: 1,203 tons, 5.8 %
    - Torpedo bulkhead: 459 tons, 2.2 %
    - Armament: 317 tons, 1.5 %
    - Armour Deck: 758 tons, 3.7 %
    - Conning Tower: 65 tons, 0.3 %
 Machinery: 6,757 tons, 32.6 %
 Hull, fittings & equipment: 9,435 tons, 45.5 %
 Fuel, ammunition & stores: 1,378 tons, 6.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   21,371 lbs / 9,694 Kg = 24.7 x 12.0 " / 305 mm shells or 2.4 torpedoes
 Stability (Unstable if below 1.00): 1.25
 Metacentric height 5.4 ft / 1.6 m
 Roll period: 14.5 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.33
 Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.454
 Length to Beam Ratio: 10.00 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 59 %
 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 (% = measuring location as a percentage of overall length):
    - Stem:  34.00 ft / 10.36 m
    - Forecastle (20 %): 31.00 ft / 9.45 m
    - Mid (67 %):  31.00 ft / 9.45 m (23.00 ft / 7.01 m aft of break)
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 28.60 ft / 8.72 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 158.9 %
  - Above water (accommodation/working, high = better): 260.2 %
 Waterplane Area: 40,955 Square feet or 3,805 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 138 lbs/sq ft or 674 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.69
  - 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