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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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:
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