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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

Tuesday, July 07, 2009

The picture posted "May 31, 1916"

Rob pointed out to me that the picture I posted five weeks ago was actually from the Battle of the Dogger Bank. The Tiger is steaming at high speed towards the left of the picture while in the background, on the right, is the burning, sinking Bl├╝cher.

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