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Sunday, August 19, 2007

A very fast destroyer for 1921

I thought that the next design should be a very fast destroyer to be laid down in 1921. With the present Springsharp program, the ship has to quite long. Still, I have not done any as well as 36.5 knots for a destroyer before. The British had wanted to develop both 5in and 5.1in guns, but never got around do finalizing either caliber. This design has 4-5in guns, as this ship needs a substantial armament. This is the Springsharp report:
GB/DD/1921 very fast, Great Britain Destroyer laid down 1921 (Engine 1950)

Displacement:
 1,717 t light; 1,788 t standard; 1,970 t normal; 2,116 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (389.52 ft / 387.00 ft) x 36.00 ft x (12.50 / 13.07 ft)
 (118.73 m / 117.96 m) x 10.97 m  x (3.81 / 3.99 m)

Armament:
      4 - 5.00" / 127 mm 55.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1921 Model
   4 x Single mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      8 - 1.57" / 40.0 mm 45.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun
   Anti-air guns in deck mounts, 1921 Model
   4 x Twin mounts on sides, forward deck aft
  4 raised mounts
      Weight of broadside 276 lbs / 125 kg
      6 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.425 t each, 8.551 t total
 In 2 sets of deck mounted centre rotating tubes

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 50,701 shp / 37,823 Kw = 36.50 kts
 Range 4,700nm at 14.00 kts
 Bunker at max displacement = 328 tons

Complement:
 147 - 192

Cost:
 £0.587 million / $2.349 million

Distribution of weights at normal displacement:
 Armament: 101 tons, 5.1 %
    - Guns: 92 tons, 4.7 %
    - Torpedoes: 9 tons, 0.4 %
 Armour: 32 tons, 1.6 %
    - Armament: 32 tons, 1.6 %
 Machinery: 987 tons, 50.1 %
 Hull, fittings & equipment: 597 tons, 30.3 %
 Fuel, ammunition & stores: 253 tons, 12.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   554 lbs / 251 Kg = 8.9 x 5.0 " / 127 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 1.5 ft / 0.4 m
 Roll period: 12.5 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.49
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and large transom stern
 Block coefficient (normal/deep): 0.396 / 0.407
 Length to Beam Ratio: 10.75 : 1
 'Natural speed' for length: 22.63 kts
 Power going to wave formation at top speed: 68 %
 Trim (Max stability = 0, Max steadiness = 100): 51
 Bow angle (Positive = bow angles forward): 6.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 18.00 %,  24.00 ft / 7.32 m,  22.00 ft / 6.71 m
    - Forward deck: 17.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Aft deck: 50.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Quarter deck: 15.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Average freeboard:  16.94 ft / 5.16 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 176.6 %
  - Above water (accommodation/working, high = better): 150.2 %
 Waterplane Area: 8,877 Square feet or 825 Square metres
 Displacement factor (Displacement / loading): 71 %
 Structure weight / hull surface area: 35 lbs/sq ft or 173 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.45
  - Longitudinal: 2.11
  - Overall: 0.53
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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