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Monday, January 30, 2006

The US/CA/1941 design seems like a "Super Ship"

The US/CA/1941 design seems to be extremely capable, to the point of being a "super ship". This version increased the number of 5in DP guns to 16 and modernized the LAA armament with 40mm and 20mm guns. The number of 21in TT was increased to 10. This is the Springsharp report:
US/CA/1941, United States Heavy Cruiser laid down 1941 (Engine 1945)

Displacement:
 17,372 t light; 18,060 t standard; 19,700 t normal; 21,012 t full load

Dimensions: Length overall / water x beam x draught
 699.71 ft / 695.00 ft x 67.00 ft x 25.00 ft (normal load)
 213.27 m / 211.84 m x 20.42 m  x 7.62 m

Armament:
      12 - 8.00" / 203 mm guns (4 mounts), 256.00lbs / 116.12kg shells, 1941 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 4 raised guns - superfiring
      16 - 5.00" / 127 mm guns (8x2 guns), 62.50lbs / 28.35kg 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, all amidships, 8 raised mounts - superfiring
      28 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on centreline, all amidships, 20 raised mounts - superfiring
 Weight of broadside 4,157 lbs / 1,886 kg
 Shells per gun, main battery: 120
 10 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 660.00 ft / 201.17 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 146 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 660.00 ft / 201.17 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 5.00" / 127 mm 2.00" / 51 mm  5.00" / 127 mm
 2nd: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

   - Armour deck: 3.50" / 89 mm, Conning tower: 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 156,416 shp / 116,687 Kw = 35.00 kts
 Range 10,000nm at 15.00 kts
 Bunker at max displacement = 2,952 tons

Complement:
 830 - 1,080

Cost:
 £9.875 million / $39.501 million

Distribution of weights at normal displacement:
 Armament: 520 tons, 2.6 %
 Armour: 5,445 tons, 27.6 %
    - Belts: 1,660 tons, 8.4 %
    - Torpedo bulkhead: 586 tons, 3.0 %
    - Armament: 838 tons, 4.3 %
    - Armour Deck: 2,281 tons, 11.6 %
    - Conning Tower: 79 tons, 0.4 %
 Machinery: 3,950 tons, 20.1 %
 Hull, fittings & equipment: 7,458 tons, 37.9 %
 Fuel, ammunition & stores: 2,328 tons, 11.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   27,408 lbs / 12,432 Kg = 107.1 x 8.0 " / 203 mm shells or 3.3 torpedoes
 Stability (Unstable if below 1.00): 1.10
 Metacentric height 3.3 ft / 1.0 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.83
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.592
 Length to Beam Ratio: 10.37 : 1
 'Natural speed' for length: 29.72 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (67 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.48 ft / 7.77 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 122.1 %
  - Above water (accommodation/working, high = better): 172.2 %
 Waterplane Area: 35,234 Square feet or 3,273 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 126 lbs/sq ft or 614 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.63
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

1 comment:

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