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Sunday, September 04, 2005

The Ger/DL/1914 design, based on the Sept. 9, 2001 drawing

I just tried the Ger/DL/1914 design, admittedly with light, high-power machinery, and it worked very well in Springsharp. The ship is 320ft x 33ft x 10ft, with a 1,250 ton normal displacement. The speed is a modest 32 knots and the armament is 4-4in QF guns, 6-21in TT in twin mounts, and there are 30 mines on rails at the stern. The ship has three funnels and is very German-looking with tubes in a well deck forward of the bridge. This is the Springsharp report:
Ger/DL/1914, Germany Destroyer Leader laid down 1914 (Engine 1937)

Displacement:
 1,067 t light; 1,102 t standard; 1,250 t normal; 1,368 t full load

Dimensions: Length overall / water x beam x draught
 321.42 ft / 320.00 ft x 33.00 ft x 10.00 ft (normal load)
 97.97 m / 97.54 m x 10.06 m  x 3.05 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1914 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread
 Weight of broadside 128 lbs / 58 kg
 Shells per gun, main battery: 150
 6 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 29,789 shp / 22,223 Kw = 32.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 266 tons

Complement:
 104 - 136

Cost:
 £0.176 million / $0.704 million

Distribution of weights at normal displacement:
 Armament: 16 tons, 1.3 %
 Machinery: 626 tons, 50.1 %
 Hull, fittings & equipment: 395 tons, 31.6 %
 Fuel, ammunition & stores: 183 tons, 14.7 %
 Miscellaneous weights: 30 tons, 2.4 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   414 lbs / 188 Kg = 12.9 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.37
 Metacentric height 1.6 ft / 0.5 m
 Roll period: 10.8 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.26
 Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.414
 Length to Beam Ratio: 9.70 : 1
 'Natural speed' for length: 17.89 kts
 Power going to wave formation at top speed: 67 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 1.00 degrees
 Stern overhang: 1.00 ft / 0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  24.00 ft / 7.32 m
    - Forecastle (20 %): 20.00 ft / 6.10 m
    - Mid (47 %):  20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
    - Quarterdeck (15 %): 12.00 ft / 3.66 m
    - Stern:  12.00 ft / 3.66 m
    - Average freeboard: 16.08 ft / 4.90 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 174.0 %
  - Above water (accommodation/working, high = better): 112.0 %
 Waterplane Area: 6,558 Square feet or 609 Square metres
 Displacement factor (Displacement / loading): 69 %
 Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.43
  - Longitudinal: 2.82
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate
 Good seaboat, rides out heavy weather easily

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