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Thursday, December 29, 2005

The ultimate development: GB/DD/1941

The GB/DD/1941 is a blend of the Tribal class with the Daring class. The speed needed to stay at 37 knots, as the cost of going higher was too great. The armament now includes 8-4.5in DP guns, 2-4in AA (an odd feature), and 16-2pdr AA guns, as well as the usual 10-21in TT. The range is now 6,000nm at 15 knots. This is the Springsharp report:
GB/DD/1941, Great Britain Destroyer laid down 1941

Displacement:
 2,515 t light; 2,629 t standard; 2,950 t normal; 3,206 t full load

Dimensions: Length overall / water x beam x draught
 388.82 ft / 387.00 ft x 37.00 ft x 17.00 ft (normal load)
 118.51 m / 117.96 m x 11.28 m  x 5.18 m

Armament:
      8 - 4.50" / 114 mm guns (4x2 guns), 45.56lbs / 20.67kg shells, 1941 Model
   Dual purpose guns in deck mounts with hoists
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 4.00" / 102 mm guns (1x2 guns), 32.00lbs / 14.51kg shells, 1941 Model
   Anti-aircraft guns in a deck mount with hoist
   on centreline amidships, all raised guns - superfiring
      16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 2 raised mounts
 Weight of broadside 460 lbs / 209 kg
 Shells per gun, main battery: 200
 10 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 71,252 shp / 53,154 Kw = 37.00 kts
 Range 6,000nm at 15.00 kts
 Bunker at max displacement = 577 tons

Complement:
 199 - 260

Cost:
 £2.249 million / $8.996 million

Distribution of weights at normal displacement:
 Armament: 57 tons, 1.9 %
 Machinery: 1,625 tons, 55.1 %
 Hull, fittings & equipment: 833 tons, 28.2 %
 Fuel, ammunition & stores: 435 tons, 14.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   640 lbs / 290 Kg = 14.0 x 4.5 " / 114 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.36
 Metacentric height 1.9 ft / 0.6 m
 Roll period: 11.2 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.62
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has rise forward of midbreak
   and transom stern
 Block coefficient: 0.424
 Length to Beam Ratio: 10.46 : 1
 'Natural speed' for length: 22.59 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  26.00 ft / 7.92 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (36 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 19.04 ft / 5.80 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 193.2 %
  - Above water (accommodation/working, high = better): 82.9 %
 Waterplane Area: 9,296 Square feet or 864 Square metres
 Displacement factor (Displacement / loading): 70 %
 Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 3.15
  - Overall: 0.53
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is cramped

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