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Thursday, April 07, 2005

Super destroyer: US/DL/1941 Large

This is the corresponding destroyer design to work with the family of large, fast warships. I call it the US/DL/1941 Large. It probably is undergunned, but I hesitate to go to a larger caliber than 5.1in. I do have 24in torpedo tubes, a high speed, and a decent range for such a small ship. This is the Springsharp report:
US/DL/1941 Large, United States Large Destroyer laid down 1941 (Engine 1945)

Displacement:
 5,412 t light; 5,622 t standard; 6,177 t normal; 6,621 t full load

Dimensions: Length overall / water x beam x draught
 479.45 ft / 475.00 ft x 48.00 ft x 22.00 ft (normal load)
 146.14 m / 144.78 m x 14.63 m  x 6.71 m

Armament:
      8 - 5.10" / 130 mm guns (4x2 guns), 66.33lbs / 30.08kg shells, 1941 Model
   Dual purpose guns in deck mounts with hoists
   on centreline ends, evenly spread, all raised mounts - superfiring
      28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on side ends, majority forward, all raised mounts - superfiring
 Weight of broadside 585 lbs / 265 kg
 Shells per gun, main battery: 250
 10 - 24.0" / 609.6 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 109,732 shp / 81,860 Kw = 36.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 1,000 tons

Complement:
 347 - 452

Cost:
 £3.949 million / $15.796 million

Distribution of weights at normal displacement:
 Armament: 73 tons, 1.2 %
 Machinery: 2,771 tons, 44.9 %
 Hull, fittings & equipment: 2,568 tons, 41.6 %
 Fuel, ammunition & stores: 765 tons, 12.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   3,401 lbs / 1,543 Kg = 51.3 x 5.1 " / 130 mm shells or 0.6 torpedoes
 Stability (Unstable if below 1.00): 1.29
 Metacentric height 2.6 ft / 0.8 m
 Roll period: 12.4 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.36
 Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.431
 Length to Beam Ratio: 9.90 : 1
 'Natural speed' for length: 21.79 kts
 Power going to wave formation at top speed: 65 %
 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:  28.00 ft / 8.53 m
    - Forecastle (20 %): 20.00 ft / 6.10 m
    - Mid (50 %):  20.00 ft / 6.10 m
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 20.64 ft / 6.29 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 154.8 %
  - Above water (accommodation/working, high = better): 95.2 %
 Waterplane Area: 14,328 Square feet or 1,331 Square metres
 Displacement factor (Displacement / loading): 101 %
 Structure weight / hull surface area: 86 lbs/sq ft or 418 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.87
  - Longitudinal: 3.51
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

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