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Tuesday, October 18, 2005

The extravagantly large and fast version of the Ger/CB/1943

This version of the design for the Ger/CB/1943 matches my current thoughts about what such a ship should be like. The size is somewhat larger, so that a maximum speed of 37 knots can be achieved, along with an 18 knot cruising speed for a range of 8,000 nm. The belt is a modest 13in. I prefer twin turrets for the secondary and tertiary batteries, so the armament is 9-21in, 16-6in QF, 16-4in AA, 72-40mm AA quad, and 56-20mm AA single. This is the Springsharp report:
Ger/CB/1943, Germany Battlecruiser laid down 1943

Displacement:
 118,293 t light; 123,122 t standard; 130,000 t normal; 135,502 t full load

Dimensions: Length overall / water x beam x draught
 1,304.66 ft / 1,300.00 ft x 150.00 ft x 41.00 ft (normal load)
 397.66 m / 396.24 m x 45.72 m  x 12.50 m

Armament:
      9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1943 Model
   Breech loading guns in turrets (on barbettes)
   on side ends, majority forward, 1 raised mount - superfiring
      16 - 6.00" / 152 mm guns (8x2 guns), 108.00lbs / 48.99kg shells, 1943 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships
      16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1943 Model
   Anti-aircraft guns in turrets (on barbettes)
   on side ends, evenly spread, all raised mounts - superfiring
      72 - 1.57" / 40.0 mm guns (18x4 guns), 1.95lbs / 0.89kg shells, 1943 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 13 raised mounts
      56 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1943 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 36 raised mounts
 Weight of broadside 44,069 lbs / 19,989 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 850.00 ft / 259.08 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 850.00 ft / 259.08 m 37.00 ft / 11.28 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 15.0" / 381 mm 11.0" / 279 mm  15.0" / 381 mm
 2nd: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm
 3rd: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm
 4th: 1.00" / 25 mm       -         -

   - Armour deck: 7.00" / 178 mm, Conning tower: 15.00" / 381 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 8 shafts, 575,246 shp / 429,134 Kw = 37.00 kts
 Range 8,000nm at 18.00 kts
 Bunker at max displacement = 12,380 tons

Complement:
 3,422 - 4,450

Cost:
 £71.001 million / $284.004 million

Distribution of weights at normal displacement:
 Armament: 5,509 tons, 4.2 %
 Armour: 38,596 tons, 29.7 %
    - Belts: 7,940 tons, 6.1 %
    - Torpedo bulkhead: 4,655 tons, 3.6 %
    - Armament: 7,231 tons, 5.6 %
    - Armour Deck: 17,942 tons, 13.8 %
    - Conning Tower: 829 tons, 0.6 %
 Machinery: 14,857 tons, 11.4 %
 Hull, fittings & equipment: 59,331 tons, 45.6 %
 Fuel, ammunition & stores: 11,707 tons, 9.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   194,150 lbs / 88,065 Kg = 41.9 x 21.0 " / 533 mm shells or 34.9 torpedoes
 Stability (Unstable if below 1.00): 1.25
 Metacentric height 13.7 ft / 4.2 m
 Roll period: 17.0 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.41
 Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.569
 Length to Beam Ratio: 8.67 : 1
 'Natural speed' for length: 36.06 kts
 Power going to wave formation at top speed: 48 %
 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:  38.00 ft / 11.58 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (50 %):  28.00 ft / 8.53 m
    - Quarterdeck (15 %): 28.00 ft / 8.53 m
    - Stern:  28.00 ft / 8.53 m
    - Average freeboard: 28.80 ft / 8.78 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 79.9 %
  - Above water (accommodation/working, high = better): 215.9 %
 Waterplane Area: 138,550 Square feet or 12,872 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 320 lbs/sq ft or 1,564 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.21
  - Longitudinal: 0.94
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

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