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Sunday, October 02, 2005

The 2001 version of the GB/DL/1906

If you allow very lightweight machinery, the GB/DL/1906 design works fairly well in Springsharp. I believe that the intended standard displacement was 1,200 tons. I used a greater normal displacement that gives a 1,215 ton standard displacement. I was able to achieve the 35 knot speed with a 15 knot cruising speed. The armament is 4-88mm (2opdr) QF guns and 2-18in TT (I could not in good conscience give them 21in TT in 1906), although that was the original intent. This is the Springsharp report:
GB/DL/1906, Great Britain Destroyer Leader laid down 1906 (Engine 1941)

Displacement:
 1,167 t light; 1,215 t standard; 1,350 t normal; 1,458 t full load

Dimensions: Length overall / water x beam x draught
 325.77 ft / 325.00 ft x 30.00 ft x 12.00 ft (normal load)
 99.29 m / 99.06 m x 9.14 m  x 3.66 m

Armament:
      4 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1906 Model
   Quick firing guns in deck mounts with hoists
   on centreline, evenly spread
   Aft Main mounts separated by engine room
 Weight of broadside 83 lbs / 38 kg
 Shells per gun, main battery: 450
 2 - 18.0" / 457.2 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 44,471 shp / 33,175 Kw = 35.00 kts
 Range 3,750nm at 15.00 kts
 Bunker at max displacement = 243 tons

Complement:
 110 - 144

Cost:
 £0.157 million / $0.626 million

Distribution of weights at normal displacement:
 Armament: 10 tons, 0.8 %
 Machinery: 764 tons, 56.6 %
 Hull, fittings & equipment: 393 tons, 29.1 %
 Fuel, ammunition & stores: 183 tons, 13.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   326 lbs / 148 Kg = 15.7 x 3.5 " / 88 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.46
 Metacentric height 1.6 ft / 0.5 m
 Roll period: 10.0 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.17
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.404
 Length to Beam Ratio: 10.83 : 1
 'Natural speed' for length: 18.03 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  22.00 ft / 6.71 m
    - Forecastle (20 %): 20.50 ft / 6.25 m
    - Mid (32 %):  20.50 ft / 6.25 m (12.50 ft / 3.81 m aft of break)
    - Quarterdeck (15 %): 12.50 ft / 3.81 m
    - Stern:  12.50 ft / 3.81 m
    - Average freeboard: 15.18 ft / 4.63 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 189.7 %
  - Above water (accommodation/working, high = better): 130.5 %
 Waterplane Area: 6,015 Square feet or 559 Square metres
 Displacement factor (Displacement / loading): 55 %
 Structure weight / hull surface area: 28 lbs/sq ft or 136 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.43
  - Longitudinal: 2.79
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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