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Wednesday, December 13, 2006

The GB/BB/1941 fast battleship

The GB/BB/1941 is a 31-knot battleship with 9-16in BLR, 20-4.5in DP, and 52-2pdr AA guns. The armour basis is 14in. This is the Springsharp report:
GB/BB/1941 Fast Battleship, Great Britain Battleship laid down 1941 (Engine 1945)

Displacement:
 48,387 t light; 50,534 t standard; 52,600 t normal; 54,253 t full load

Dimensions: Length overall / water x beam x draught
 866.80 ft / 864.00 ft x 112.00 ft x 32.00 ft (normal load)
 264.20 m / 263.35 m x 34.14 m  x 9.75 m

Armament:
      9 - 16.00" / 406 mm guns (3x3 guns), 2,048.00lbs / 928.96kg shells, 1941 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      20 - 4.50" / 114 mm guns (10x2 guns), 45.56lbs / 20.67kg shells, 1941 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships
      40 - 1.57" / 40.0 mm guns (10x4 guns), 1.95lbs / 0.89kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 7 raised mounts
      12 - 1.57" / 40.0 mm guns (3x4 guns), 1.95lbs / 0.89kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on centreline, evenly spread
 Weight of broadside 19,445 lbs / 8,820 kg
 Shells per gun, main battery: 100

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 580.00 ft / 176.78 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 103 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 580.00 ft / 176.78 m 32.00 ft / 9.75 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 9.00" / 229 mm  14.0" / 356 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 14.00" / 356 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 169,042 shp / 126,106 Kw = 31.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 3,720 tons

Complement:
 1,736 - 2,257

Cost:
 £26.785 million / $107.140 million

Distribution of weights at normal displacement:
 Armament: 2,431 tons, 4.6 %
 Armour: 21,121 tons, 40.2 %
    - Belts: 5,535 tons, 10.5 %
    - Torpedo bulkhead: 2,747 tons, 5.2 %
    - Armament: 4,270 tons, 8.1 %
    - Armour Deck: 8,145 tons, 15.5 %
    - Conning Tower: 423 tons, 0.8 %
 Machinery: 4,269 tons, 8.1 %
 Hull, fittings & equipment: 20,567 tons, 39.1 %
 Fuel, ammunition & stores: 4,214 tons, 8.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   88,821 lbs / 40,288 Kg = 43.4 x 16.0 " / 406 mm shells or 16.6 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 7.6 ft / 2.3 m
 Roll period: 17.1 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.56
 Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.595
 Length to Beam Ratio: 7.71 : 1
 'Natural speed' for length: 33.89 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (50 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.64 ft / 7.51 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 75.1 %
  - Above water (accommodation/working, high = better): 193.2 %
 Waterplane Area: 73,378 Square feet or 6,817 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 209 lbs/sq ft or 1,020 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.17
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

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