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Saturday, July 16, 2005

The Ger/DD/1905 works with less expensive machinery

The Ger/DD/1905 destroyer design that I intended to produce in numbers for the original game has a reasonable Springsharp design. The machinery is less expensive than the Ger/CS/1905 design. A nasty feature is that to make designs work for destroyers, it is necessary to jigger the engine date. Some ships built in the period even before 1914, much less before 1918, had fairly high power output machinery for the weight. That certainly meant higher cost. The Ger/DD/1905 design is better in that the machinery works with a lower power output than I had expected. This is the Springsharp report:
Ger/DD/1905, Germany Destroyer laid down 1905 (Engine 1935)

Displacement:
 764 t light; 787 t standard; 870 t normal; 936 t full load

Dimensions: Length overall / water x beam x draught
 270.73 ft / 270.00 ft x 28.00 ft x 10.50 ft (normal load)
 82.52 m / 82.30 m x 8.53 m  x 3.20 m

Armament:
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread
 Weight of broadside 64 lbs / 29 kg
 Shells per gun, main battery: 150
 2 - 18.0" / 457.2 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 25,657 shp / 19,140 Kw = 32.00 kts
 Range 2,800nm at 15.00 kts
 Bunker at max displacement = 149 tons

Complement:
 79 - 104

Cost:
 £0.098 million / $0.391 million

Distribution of weights at normal displacement:
 Armament: 8 tons, 0.9 %
 Machinery: 459 tons, 52.8 %
 Hull, fittings & equipment: 297 tons, 34.1 %
 Fuel, ammunition & stores: 106 tons, 12.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   278 lbs / 126 Kg = 8.7 x 4.0 " / 102 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.37
 Metacentric height 1.3 ft / 0.4 m
 Roll period: 10.3 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.18
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.384
 Length to Beam Ratio: 9.64 : 1
 'Natural speed' for length: 16.43 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:  21.00 ft / 6.40 m
    - Forecastle (20 %): 19.00 ft / 5.79 m
    - Mid (32 %):  19.00 ft / 5.79 m (11.00 ft / 3.35 m aft of break)
    - Quarterdeck (15 %): 11.00 ft / 3.35 m
    - Stern:  11.00 ft / 3.35 m
    - Average freeboard: 13.72 ft / 4.18 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 177.5 %
  - Above water (accommodation/working, high = better): 120.3 %
 Waterplane Area: 4,616 Square feet or 429 Square metres
 Displacement factor (Displacement / loading): 57 %
 Structure weight / hull surface area: 29 lbs/sq ft or 140 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.49
  - Longitudinal: 3.63
  - Overall: 0.59
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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