US/DD/1936a1, Enter country Enter ship type laid down 1936 Displacement: 1,977 t light; 2,063 t standard; 2,243 t normal; 2,386 t full load Dimensions: Length overall / water x beam x draught 376.84 ft / 376.00 ft x 37.00 ft x 14.00 ft (normal load) 114.86 m / 114.60 m x 11.28 m x 4.27 m Armament: 6 - 5.00" / 127 mm guns (3x2 guns), 62.50lbs / 28.35kg shells, 1936 Model Dual purpose guns in deck mounts with hoists on centreline ends, majority forward, all raised mounts - superfiring 12 - 1.57" / 40.0 mm guns (3x4 guns), 1.95lbs / 0.89kg shells, 1936 Model Anti-aircraft guns in deck mounts on side ends, majority aft, all raised mounts - superfiring Weight of broadside 398 lbs / 181 kg Shells per gun, main battery: 180 10 - 21.0" / 533.4 mm above water torpedoes Machinery: Oil fired boilers, steam turbines, Geared drive, 2 shafts, 53,204 shp / 39,690 Kw = 36.00 kts Range 3,750nm at 15.00 kts Bunker at max displacement = 323 tons Complement: 162 - 211 Cost: £1.464 million / $5.855 million Distribution of weights at normal displacement: Armament: 50 tons, 2.2 % Machinery: 1,190 tons, 53.1 % Hull, fittings & equipment: 737 tons, 32.9 % Fuel, ammunition & stores: 266 tons, 11.9 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 570 lbs / 258 Kg = 9.1 x 5.0 " / 127 mm shells or 0.3 torpedoes Stability (Unstable if below 1.00): 1.28 Metacentric height 1.8 ft / 0.5 m Roll period: 11.7 seconds Steadiness - As gun platform (Average = 50 %): 60 % - Recoil effect (Restricted arc if above 1.00): 0.72 Seaboat quality (Average = 1.00): 1.16 Hull form characteristics: Hull has a flush deck and transom stern Block coefficient: 0.403 Length to Beam Ratio: 10.16 : 1 'Natural speed' for length: 22.39 kts Power going to wave formation at top speed: 69 % Trim (Max stability = 0, Max steadiness = 100): 52 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: 24.00 ft / 7.32 m - Forecastle (20 %): 18.00 ft / 5.49 m - Mid (50 %): 18.00 ft / 5.49 m - Quarterdeck (15 %): 18.00 ft / 5.49 m - Stern: 18.00 ft / 5.49 m - Average freeboard: 18.48 ft / 5.63 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 188.5 % - Above water (accommodation/working, high = better): 95.1 % Waterplane Area: 8,903 Square feet or 827 Square metres Displacement factor (Displacement / loading): 66 % Structure weight / hull surface area: 37 lbs/sq ft or 182 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.43 - Longitudinal: 3.05 - Overall: 0.53 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is adequate
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Sunday, January 23, 2005
I had fallen into the trap thinking that I had to have a composite strength of 1.0
I keep forgetting the Springsharp allows a composite strength less than 1.0 for light, fast combatants. I keep doing bad things to my destroyer design (US/DD/1936) because I was trying to get the composite strength to 1.0, when I didn't need to do so. Instead, I was able to achieve a reasonable result (I guess) with a design that has a rather modern look, with a fairly high-freeboard, flush decked hull. The speed is 36 knots and the armament is 6-5in DP, 12-40mm AA, and with 10-21in TT. The machinery still weighs too much, but I guess that doesn't matter.
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