A new Ger/BB/1916 design study

This design study is based on what seems to be the definitive specification for the Ger/BB/1916 battleship design. These are the values specified:

• Dimensions: 760ft x 132ft x 36.5ft
• Displacement: 65,000 tons
• Hull depth: 65ft
• Cp: 0.64
• Cm: 0.97
• Power: 81,250 SHP
• Armament: 9-18in/45 and 24-5in QF guns
• Hull weight: 22,171 tons
• Machinery (30SHP/ton): 2,700 tons
• Armament: 3,358 tons
• Protection: 34,663 tons
• Aux. Mach: 2,100 tons
• Fuel: 2,800 tons, maximum
• Feed Water: 420 tons

This is the Springsharp report:

Ger/BB/1916, Germany Battleship laid down 1916 (Engine 1921)

Displacement:
 59,036 t light; 61,582 t standard; 65,000 t normal; 67,734 t full load

Dimensions: Length overall / water x beam x draught
 764.24 ft / 760.00 ft x 132.00 ft x 36.50 ft (normal load)
 232.94 m / 231.65 m x 40.23 m  x 11.13 m

Armament:
      9 - 18.00" / 457 mm guns (3x3 guns), 2,916.00lbs / 1,322.68kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      24 - 5.00" / 127 mm guns (12x2 guns), 62.50lbs / 28.35kg shells, 1916 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 27,744 lbs / 12,584 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 560.00 ft / 170.69 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 113 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 560.00 ft / 170.69 m 35.00 ft / 10.67 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 20.0" / 508 mm 12.0" / 305 mm  18.0" / 457 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 20.00" / 508 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 81,805 shp / 61,026 Kw = 23.50 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 6,152 tons

Complement:
 2,035 - 2,646

Cost:
 £8.793 million / $35.174 million

Distribution of weights at normal displacement:
 Armament: 3,468 tons, 5.3 %
 Armour: 28,624 tons, 44.0 %
    - Belts: 7,369 tons, 11.3 %
    - Torpedo bulkhead: 2,901 tons, 4.5 %
    - Armament: 6,581 tons, 10.1 %
    - Armour Deck: 11,077 tons, 17.0 %
    - Conning Tower: 697 tons, 1.1 %
 Machinery: 2,817 tons, 4.3 %
 Hull, fittings & equipment: 24,127 tons, 37.1 %
 Fuel, ammunition & stores: 5,964 tons, 9.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   114,835 lbs / 52,088 Kg = 39.4 x 18.0 " / 457 mm shells or 26.0 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 9.2 ft / 2.8 m
 Roll period: 18.2 seconds
 Steadiness - As gun platform (Average = 50 %): 82 %
   - Recoil effect (Restricted arc if above 1.00): 0.60
 Seaboat quality  (Average = 1.00): 1.64

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.621
 Length to Beam Ratio: 5.76 : 1
 'Natural speed' for length: 27.57 kts
 Power going to wave formation at top speed: 45 %
 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:  32.00 ft / 9.75 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (50 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.56 ft / 7.79 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 64.0 %
  - Above water (accommodation/working, high = better): 175.1 %
 Waterplane Area: 74,842 Square feet or 6,953 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 242 lbs/sq ft or 1,182 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.70
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather