The Ger/BB/1915 Design Study F1

One design study that I did in 1973 for a German battleship was for what I am calling the Ger/BB/1915 F1. The dimensions were 755ft x 110ft x 32ft, and I was able to make that work in Springsharp. The armament was 9-16.5in (130 ton) and 10-6in/50 QF (6 ton) guns. The designed power was 120,000, for 24.8 knots normal and 26.2 knots maximum, but that proved to be too much power for the speed. The designed power was 30SHP/ton of machinery. My current version of the design has a belt that doesn't cover the magazines and machinery spaces completely. I may have to relent and increase the length. At the higher displacement of 48,75o tons, Springsharp only requires some 116,134 SHP to reach 27 knots. The resulting ship has a rather British look iwth two stacks, a bridge structure and tripod mast with a tops forward and a tripod mainmast with a tall topmast. The hull steps down at about 64% of the length, and it has a clipper-like bow. This is the Springsharp report:

Ger/BB/1915 design study F1, Germany Battleship laid down 1915 (Engine 1921)

Displacement:
 43,758 t light; 45,887 t standard; 48,750 t normal; 51,040 t full load

Dimensions: Length overall / water x beam x draught
 756.73 ft / 755.00 ft x 110.00 ft x 32.00 ft (normal load)
 230.65 m / 230.12 m x 33.53 m  x 9.75 m

Armament:
     9 - 16.50" / 419 mm guns (3x3 guns), 2,425.00lbs / 1,099.96kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
     10 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, 2 raised mounts - superfiring
 Weight of broadside 22,905 lbs / 10,390 kg
 Shells per gun, main battery: 90

Armour:
  - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 16.0" / 406 mm 490.00 ft / 149.35 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length

  - Torpedo Bulkhead:
  3.00" / 76 mm 490.00 ft / 149.35 m 29.00 ft / 8.84 m

  - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 16.0" / 406 mm 7.00" / 178 mm  16.0" / 406 mm
 2nd: 2.00" / 51 mm       -         -

  - Armour deck: 5.00" / 127 mm, Conning tower: 16.00" / 406 mm

Machinery:
 Oil fired boilers, steam turbines,
 Geared drive, 4 shafts, 116,134 shp / 86,636 Kw = 27.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 5,153 tons

Complement:
 1,639 - 2,132

Cost:
 £6.294 million / $25.177 million

Distribution of weights at normal displacement:
 Armament: 2,662 tons, 5.5 %
 Armour: 17,826 tons, 36.6 %
    - Belts: 5,804 tons, 11.9 %
    - Torpedo bulkhead: 1,577 tons, 3.2 %
    - Armament: 4,142 tons, 8.5 %
    - Armour Deck: 5,842 tons, 12.0 %
    - Conning Tower: 460 tons, 0.9 %
 Machinery: 3,999 tons, 8.2 %
 Hull, fittings & equipment: 19,271 tons, 39.5 %
 Fuel, ammunition & stores: 4,992 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   73,228 lbs / 33,216 Kg = 32.6 x 16.5 " / 419 mm shells or 11.8 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 7.0 ft / 2.1 m
 Roll period: 17.4 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.82
 Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.642
 Length to Beam Ratio: 6.86 : 1
 'Natural speed' for length: 27.48 kts
 Power going to wave formation at top speed: 50 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (64 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  0.00 ft / 0.00 m
    - Average freeboard: 24.02 ft / 7.32 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 83.1 %
  - Above water (accommodation/working, high = better): 186.5 %
 Waterplane Area: 63,157 Square feet or 5,867 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 223 lbs/sq ft or 1,087 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.45
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily