A really extravagant version of the Ger/CB/1915A design

I thought that it would be interesting to see how one of the more extravagant designs that I did in 1971-1972 worked, given my new understanding about how to specify guns. The ship is quite long, being 962ft on the waterline. The beam is 110ft. I had hoped, back in the early 1970's, that the standard displacement could be as low as 47,550 tons. The armament is 6-16.5in guns in two triple turrets forward. The secondary armament is in twin mounts, and consists of 20-5in QF guns. The belt is 12in and the deck is very thick at 7in. The A/T bulkhead is a very thick 3in. I had hoped for 40 knots, but the best that I seem to be able to do is 38 knots, which is still extremely fast for a large ship. The belt is quite short and is inclined outward. This is the Springsharp report:

Ger/CB/1915A, Germany Battlecruiser laid down 1915 (Engine 1937)

Displacement:
 55,480 t light; 57,398 t standard; 60,234 t normal; 62,502 t full load

Dimensions: Length overall / water x beam x draught
 962.94 ft / 961.00 ft x 110.00 ft x 37.00 ft (normal load)
 293.50 m / 292.91 m x 33.53 m  x 11.28 m

Armament:
      6 - 16.50" / 419 mm guns (2x3 guns), 2,425.00lbs / 1,099.96kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread, 6 raised mounts
 Weight of broadside 15,800 lbs / 7,167 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 495.00 ft / 150.88 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 79 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  3.00" / 76 mm 495.00 ft / 150.88 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 7.00" / 178 mm  10.0" / 254 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 7.00" / 178 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 8 shafts, 435,684 shp / 325,020 Kw = 38.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 5,105 tons

Complement:
 1,922 - 2,499

Cost:
 £7.533 million / $30.130 million

Distribution of weights at normal displacement:
 Armament: 1,841 tons, 3.1 %
 Armour: 18,116 tons, 30.1 %
    - Belts: 4,448 tons, 7.4 %
    - Torpedo bulkhead: 1,593 tons, 2.6 %
    - Armament: 2,321 tons, 3.9 %
    - Armour Deck: 9,456 tons, 15.7 %
    - Conning Tower: 298 tons, 0.5 %
 Machinery: 12,076 tons, 20.0 %
 Hull, fittings & equipment: 23,447 tons, 38.9 %
 Fuel, ammunition & stores: 4,754 tons, 7.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   75,935 lbs / 34,444 Kg = 33.8 x 16.5 " / 419 mm shells or 8.9 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 7.6 ft / 2.3 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.539
 Length to Beam Ratio: 8.74 : 1
 'Natural speed' for length: 31.00 kts
 Power going to wave formation at top speed: 57 %
 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:  37.00 ft / 11.28 m
    - Forecastle (20 %): 31.00 ft / 9.45 m
    - Mid (50 %):  31.00 ft / 9.45 m
    - Quarterdeck (15 %): 31.00 ft / 9.45 m
    - Stern:  31.00 ft / 9.45 m
    - Average freeboard: 31.48 ft / 9.60 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 107.8 %
  - Above water (accommodation/working, high = better): 224.3 %
 Waterplane Area: 73,018 Square feet or 6,784 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 209 lbs/sq ft or 1,022 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.48
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent