The Ger/CB/1912 battlecruiser

The Ger/CB/1912 battlecruiser design actually can work with heavier machinery, if we had accepted a higher Standard displacement. However, I wanted to match the Standard displacement and weights, as much as possible, so I lightened the machinery to 1937 standard. This is the original specification:

Ger/CB/1912  32,659 tons Standard
6-15in/45 (82.5 tons)
176,000 SHP  40 SHP/ton = 32 knots
8-6in QF guns (5.5 tons)
Hull weight coefficient (C)=0.34
Cp=0.56  Cm=0.97
Length=820ft  Beam=105ft  Draft=29.4ft max
Hull depth=58ft

Weights:                       Protection:
Armament=    1,292 tons        Belt = 6in
Protection= 10,867 tons        Decks= 5in + 4in
Hull=       13,500 tons        2in A/T protection
Machinery=   4,400 tons
Misc.=       2,600 tons
Oil fuel=    6,000 tons
Feedwater=     900 tons
full load=  39,559 tons

This is the Springsharp report, as implemented:

Ger/CB/1912, Germany Battlecruiser laid down 1912 (Engine 1936)

Displacement:
 31,454 t light; 32,700 t standard; 34,450 t normal; 35,850 t full load

Dimensions: Length overall / water x beam x draught
 823.00 ft / 820.00 ft x 105.00 ft x 29.40 ft (normal load)
 250.85 m / 249.94 m x 32.00 m  x 8.96 m

Armament:
      6 - 15.00" / 381 mm guns (2x3 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, 2 raised mounts - superfiring
 Weight of broadside 10,989 lbs / 4,985 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 405.00 ft / 123.44 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 76 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 405.00 ft / 123.44 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 6.00" / 152 mm  10.0" / 254 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 5.00" / 127 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 163,423 shp / 121,913 Kw = 32.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 3,151 tons

Complement:
 1,263 - 1,643

Cost:
 £2.897 million / $11.587 million

Distribution of weights at normal displacement:
 Armament: 1,374 tons, 4.0 %
 Armour: 9,928 tons, 28.8 %
    - Belts: 1,749 tons, 5.1 %
    - Torpedo bulkhead: 869 tons, 2.5 %
    - Armament: 1,932 tons, 5.6 %
    - Armour Deck: 5,195 tons, 15.1 %
    - Conning Tower: 182 tons, 0.5 %
 Machinery: 4,585 tons, 13.3 %
 Hull, fittings & equipment: 15,567 tons, 45.2 %
 Fuel, ammunition & stores: 2,996 tons, 8.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   54,772 lbs / 24,844 Kg = 32.5 x 15.0 " / 381 mm shells or 8.1 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.31

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.476
 Length to Beam Ratio: 7.81 : 1
 'Natural speed' for length: 28.64 kts
 Power going to wave formation at top speed: 50 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  35.00 ft / 10.67 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (60 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 25.36 ft / 7.73 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 90.8 %
  - Above water (accommodation/working, high = better): 211.1 %
 Waterplane Area: 56,163 Square feet or 5,218 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 194 lbs/sq ft or 947 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.48
  - 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