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Monday, May 14, 2007

A large, but not extremely large, German battlecruiser

In more recent years, I have been thinking of designing rather large, but not quite so very large ships. This version backs off the size, protection, and range, to reduce the size and cost of a German battlecruiser, the Ger/CB/1943 Large design. This has 9-21in guns and a speed of 35 knots. The range is 10,000nm at 16 knots. The armour basis is 16in with a 7in deck. This is the Springsharp report:
Ger/CB/1943 Large, Germany Battlecruiser laid down 1943

Displacement:
 137,845 t light; 144,080 t standard; 151,306 t normal; 157,087 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (1,264.14 ft / 1,250.00 ft) x 170.00 ft x (39.00 / 40.20 ft)
 (385.31 m / 381.00 m) x 51.82 m  x (11.89 / 12.25 m)

Armament:
      9 - 21.00" / 533 mm 50.0 cal guns - 4,900.00lbs / 2,222.60kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts , 1943 Model
   9 x Triple mounts on centreline ends, majority forward
  3 raised mounts - superfiring
      16 - 6.00" / 152 mm 55.0 cal guns - 116.57lbs / 52.88kg shells, 180 per gun
   Quick firing guns in turret on barbette mount , 1943 Model
   1 x Twin mount on sides amidships
      24 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts , 1943 Model
   12 x Twin mounts on sides, evenly spread
  12 raised mounts
      64 - 1.46" / 37.0 mm 60.0 cal guns - 1.69lbs / 0.77kg shells, 240 per gun
   Breech loading guns in deck mounts , 1943 Model
   32 x Twin mounts on sides, evenly spread
  24 raised mounts
 Weight of broadside 46,886 lbs / 46,886 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 16.0" / 406 mm 840.00 ft / 256.03 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 103 % of normal length

   - Torpedo Bulkhead:
  7.00" / 178 mm 840.00 ft / 256.03 m 39.00 ft / 11.89 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 18.0" / 457 mm 12.0" / 305 mm  18.0" / 457 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 3rd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 7.00" / 178 mm, Conning tower: 16.00" / 406 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 8 shafts, 480,244 shp / 358,262 Kw = 35.00 kts
 Range 10,000nm at 16.00 kts
 Bunker at max displacement = 13,007 tons

Complement:
 3,835 - 4,986

Cost:
 £74.873 million / $299.491 million

Distribution of weights at normal displacement:
 Armament: 7,789 tons, 5.1 %
 Armour: 54,927 tons, 36.3 %
    - Belts: 9,227 tons, 6.1 %
    - Torpedo bulkhead: 8,485 tons, 5.6 %
    - Armament: 14,469 tons, 9.6 %
    - Armour Deck: 21,768 tons, 14.4 %
    - Conning Tower: 979 tons, 0.6 %
 Machinery: 12,403 tons, 8.2 %
 Hull, fittings & equipment: 64,708 tons, 42.8 %
 Fuel, ammunition & stores: 13,461 tons, 8.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   297,322 lbs / 134,863 Kg = 64.2 x 21.0 " / 533 mm shells or 81.7 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 14.9 ft / 4.5 m
 Roll period: 18.5 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and small transom stern
 Block coefficient (normal/deep): 0.639 / 0.644
 Length to Beam Ratio: 7.35 : 1
 'Natural speed' for length: 40.75 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 12.00 degrees
 Stern overhang: 5.00 ft / 1.52 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  43.00 ft / 13.11 m,  35.00 ft / 10.67 m
    - Forward deck: 30.00 %,  35.00 ft / 10.67 m,  33.00 ft / 10.06 m
    - Aft deck: 35.00 %,  33.00 ft / 10.06 m,  33.00 ft / 10.06 m
    - Quarter deck: 15.00 %,  33.00 ft / 10.06 m,  35.00 ft / 10.67 m
    - Average freeboard:  34.49 ft / 10.51 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 64.2 %
  - Above water (accommodation/working, high = better): 279.4 %
 Waterplane Area: 168,089 Square feet or 15,616 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 306 lbs/sq ft or 1,496 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.08
  - Longitudinal: 0.97
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

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