The Ger/CB/1915 design study

There is a drawing and armor specifications for a battlecruiser in the series with my other designs for ships with two, superimposed triple turrets forward. The idea was always to shorten the citidel length, although Springsharp may not support this very much. The armor basis for this design is 12in and the speed is 33 knots. The ship has a tower foremast and three funnels. The hull steps down at about 74%. This is the Springsharp report:

Ger/CB/1915, Germany Battlecruiser laid down 1915 (Engine 1929)

Displacement:
 42,800 t light; 44,432 t standard; 48,300 t normal; 51,394 t full load

Dimensions: Length overall / water x beam x draught
 901.78 ft / 900.00 ft x 100.00 ft x 32.00 ft (normal load)
 274.86 m / 274.32 m x 30.48 m  x 9.75 m

Armament:
      6 - 16.50" / 419 mm guns (2x3 guns), 2,246.06lbs / 1,018.80kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1915 Model
   Quick firing guns in turrets (on barbettes)
   on side, all aft
 Weight of broadside 14,772 lbs / 6,701 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 620.00 ft / 188.98 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 106 % of normal length

   - Torpedo Bulkhead:
  1.50" / 38 mm 620.00 ft / 188.98 m 27.00 ft / 8.23 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: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 225,875 shp / 168,503 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 6,963 tons

Complement:
 1,628 - 2,117

Cost:
 £5.848 million / $23.391 million

Distribution of weights at normal displacement:
 Armament: 1,847 tons, 3.8 %
 Armour: 14,452 tons, 29.9 %
    - Belts: 5,285 tons, 10.9 %
    - Torpedo bulkhead: 929 tons, 1.9 %
    - Armament: 3,197 tons, 6.6 %
    - Armour Deck: 4,812 tons, 10.0 %
    - Conning Tower: 229 tons, 0.5 %
 Machinery: 6,937 tons, 14.4 %
 Hull, fittings & equipment: 19,564 tons, 40.5 %
 Fuel, ammunition & stores: 5,500 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   70,531 lbs / 31,992 Kg = 31.4 x 16.5 " / 419 mm shells or 8.6 torpedoes
 Stability (Unstable if below 1.00): 1.10
 Metacentric height 6.0 ft / 1.8 m
 Roll period: 17.2 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.83
 Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.587
 Length to Beam Ratio: 9.00 : 1
 'Natural speed' for length: 30.00 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: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  34.00 ft / 10.36 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (74 %):  30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 28.24 ft / 8.61 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 94.3 %
  - Above water (accommodation/working, high = better): 217.9 %
 Waterplane Area: 65,027 Square feet or 6,041 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 201 lbs/sq ft or 983 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.31
  - 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