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

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

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

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

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

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

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

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

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

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

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

Complement:
 1,139 - 1,481

Cost:
 £6.302 million / $25.207 million

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

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

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

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