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Friday, July 17, 2009

A super American battlecruiser: the US/CB/1943

I have been toying with very large battleship and battlecruiser designs since I was young. This is a fast battlecruiser armed with 12-21in/55 guns. I don't like the deep draft, but I don't see an alternative.
US-CB-1943, United States Battlecruiser laid down 1943

Displacement:
 192,480 t light; 201,981 t standard; 217,137 t normal; 229,261 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (1,366.74 ft / 1,350.00 ft) x 188.00 ft x (38.00 / 39.85 ft)
 (416.58 m / 411.48 m) x 57.30 m  x (11.58 / 12.15 m)

Armament:
      12 - 21.00" / 533 mm 55.0 cal guns - 5,000.00lbs / 2,267.96kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1943 Model
   3 x Quad mounts on centreline ends, majority forward
  1 raised mount - superfiring
      24 - 5.00" / 127 mm 55.0 cal guns - 72.00lbs / 32.66kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1943 Model
   12 x Twin mounts on sides, forward deck aft
  4 raised mounts - superfiring
      88 - 1.57" / 40.0 mm 60.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun
   Breech loading guns in deck mounts, 1943 Model
   22 x 4-gun mounts on sides, evenly spread
  12 raised mounts
      Weight of broadside 61,904 lbs / 28,079 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 900.00 ft / 274.32 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 14.0" / 356 mm 900.00 ft / 274.32 m 9.00 ft / 2.74 m
   Main Belt covers 103 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined -17.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  8.00" / 203 mm 900.00 ft / 274.32 m 37.00 ft / 11.28 m
 Beam between torpedo bulkheads 80.00 ft / 24.38 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 20.0" / 508 mm 15.0" / 381 mm  20.0" / 508 mm
 2nd: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 8.00" / 203 mm
 Forecastle: 5.00" / 127 mm  Quarter deck: 8.00" / 203 mm

   - Conning towers: Forward 20.00" / 508 mm, Aft 15.00" / 381 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 10 shafts, 637,542 shp / 475,606 Kw = 35.00 kts
 Range 12,000nm at 18.00 kts
 Bunker at max displacement = 27,280 tons

Complement:
 5,029 - 6,538

Cost:
 £105.209 million / $420.837 million

Distribution of weights at normal displacement:
 Armament: 11,042 tons, 5.1 %
    - Guns: 11,042 tons, 5.1 %
 Armour: 69,922 tons, 32.2 %
    - Belts: 11,396 tons, 5.2 %
    - Torpedo bulkhead: 9,857 tons, 4.5 %
    - Armament: 12,878 tons, 5.9 %
    - Armour Deck: 33,067 tons, 15.2 %
    - Conning Towers: 2,724 tons, 1.3 %
 Machinery: 16,465 tons, 7.6 %
 Hull, fittings & equipment: 95,051 tons, 43.8 %
 Fuel, ammunition & stores: 24,657 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   495,302 lbs / 224,665 Kg = 107.0 x 21.0 " / 533 mm shells or 150.3 torpedoes
 Stability (Unstable if below 1.00): 1.36
 Metacentric height 22.2 ft / 6.8 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.32
 Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and large transom stern
 Block coefficient (normal/deep): 0.788 / 0.793
 Length to Beam Ratio: 7.18 : 1
 'Natural speed' for length: 41.90 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 20.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  46.00 ft / 14.02 m,  40.00 ft / 12.19 m
    - Forward deck: 30.00 %,  40.00 ft / 12.19 m,  38.00 ft / 11.58 m
    - Aft deck: 35.00 %,  38.00 ft / 11.58 m,  37.00 ft / 11.28 m
    - Quarter deck: 15.00 %,  37.00 ft / 11.28 m,  38.00 ft / 11.58 m
    - Average freeboard:  38.93 ft / 11.87 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 129.5 %
  - Above water (accommodation/working, high = better): 332.2 %
 Waterplane Area: 229,646 Square feet or 21,335 Square metres
 Displacement factor (Displacement / loading): 128 %
 Structure weight / hull surface area: 352 lbs/sq ft or 1,718 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.18
  - Longitudinal: 0.95
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

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