The very large and extremely fast "light battlecruiser", the GB/CB/1927

This was an attempt to see what could be achieved by reducing armament and protection while keeping the size large. In Springsharp, there seems to be some advantage in big ships over small ships. My GB/CB/1927 can reach a ridiculously fast 41.5 knots. That is approaching the sort of speeds that I had hoped might be achievable back in 1973. This version has 6-12in guns in two triple turrets forward and the usual secondary armament. The belt is 5in and the deck is 3.5in. This is the Springsharp report:

GB/CB/1927 12in guns 41.5 knots, Great Britain Battlecruiser laid down 1927 (Engine 1941)

Displacement:
 41,113 t light; 42,355 t standard; 45,500 t normal; 48,016 t full load

Dimensions: Length overall / water x beam x draught
 927.32 ft / 924.00 ft x 116.00 ft x 34.00 ft (normal load)
 282.65 m / 281.64 m x 35.36 m  x 10.36 m

Armament:
      6 - 12.00" / 305 mm guns (2x3 guns), 864.00lbs / 391.90kg shells, 1927 Model
   Breech loading guns in turrets (on barbettes)
   on side, all forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1927 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, 1927 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, 1927 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 6,373 lbs / 2,891 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 590.00 ft / 179.83 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 98 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 590.00 ft / 179.83 m 34.00 ft / 10.36 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 7.00" / 178 mm 5.00" / 127 mm  7.00" / 178 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 3.50" / 89 mm, Conning tower: 7.00" / 178 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 429,998 shp / 320,778 Kw = 41.50 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 5,661 tons

Complement:
 1,556 - 2,024

Cost:
 £13.451 million / $53.804 million

Distribution of weights at normal displacement:
 Armament: 797 tons, 1.8 %
 Armour: 9,807 tons, 21.6 %
    - Belts: 2,003 tons, 4.4 %
    - Torpedo bulkhead: 1,484 tons, 3.3 %
    - Armament: 1,577 tons, 3.5 %
    - Armour Deck: 4,550 tons, 10.0 %
    - Conning Tower: 192 tons, 0.4 %
 Machinery: 11,364 tons, 25.0 %
 Hull, fittings & equipment: 19,146 tons, 42.1 %
 Fuel, ammunition & stores: 4,387 tons, 9.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   64,735 lbs / 29,363 Kg = 74.9 x 12.0 " / 305 mm shells or 8.0 torpedoes
 Stability (Unstable if below 1.00): 1.25
 Metacentric height 9.3 ft / 2.8 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.23
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.437
 Length to Beam Ratio: 7.97 : 1
 'Natural speed' for length: 35.66 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 54
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  38.00 ft / 11.58 m
    - Forecastle (20 %): 32.00 ft / 9.75 m
    - Mid (35 %):  32.00 ft / 9.75 m
    - Quarterdeck (15 %): 32.00 ft / 9.75 m
    - Stern:  32.00 ft / 9.75 m
    - Average freeboard: 32.48 ft / 9.90 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 114.2 %
  - Above water (accommodation/working, high = better): 275.3 %
 Waterplane Area: 70,269 Square feet or 6,528 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 186 lbs/sq ft or 908 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.67
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent