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