GB/DD/1921 small and fast, Great Britain Destroyer laid down 1921 (Engine 1950) Displacement: 1,251 t light; 1,306 t standard; 1,429 t normal; 1,527 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (358.23 ft / 355.00 ft) x 33.00 ft x (11.00 / 11.46 ft) (109.19 m / 108.20 m) x 10.06 m x (3.35 / 3.49 m) Armament: 4 - 4.70" / 119 mm 45.0 cal guns - 52.35lbs / 23.75kg 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 6 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 150 per gun Anti-air guns in deck mounts, 1921 Model 6 x Single mounts on sides, forward deck aft Weight of broadside 221 lbs / 100 kg 6 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.307 t each, 7.841 t total In 2 sets of deck mounted carriage/fixed tubes Armour: - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 2 shafts, 36,069 shp / 26,907 Kw = 35.00 kts Range 3,800nm at 14.00 kts Bunker at max displacement = 221 tons Complement: 116 - 151 Cost: £0.410 million / $1.642 million Distribution of weights at normal displacement: Armament: 68 tons, 4.7 % - Guns: 60 tons, 4.2 % - Torpedoes: 8 tons, 0.5 % Armour: 27 tons, 1.9 % - Armament: 27 tons, 1.9 % Machinery: 691 tons, 48.4 % Hull, fittings & equipment: 465 tons, 32.6 % Fuel, ammunition & stores: 178 tons, 12.4 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 455 lbs / 206 Kg = 8.8 x 4.7 " / 119 mm shells or 0.3 torpedoes Stability (Unstable if below 1.00): 1.16 Metacentric height 1.3 ft / 0.4 m Roll period: 12.4 seconds Steadiness - As gun platform (Average = 50 %): 53 % - Recoil effect (Restricted arc if above 1.00): 0.54 Seaboat quality (Average = 1.00): 1.06 Hull form characteristics: Hull has rise forward of midbreak, a normal bow and large transom stern Block coefficient (normal/deep): 0.388 / 0.398 Length to Beam Ratio: 10.76 : 1 'Natural speed' for length: 21.70 kts Power going to wave formation at top speed: 67 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 8.00 degrees Stern overhang: 0.00 ft / 0.00 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 16.00 %, 23.00 ft / 7.01 m, 21.00 ft / 6.40 m - Forward deck: 16.00 %, 21.00 ft / 6.40 m, 21.00 ft / 6.40 m - Aft deck: 53.00 %, 13.00 ft / 3.96 m, 13.00 ft / 3.96 m - Quarter deck: 15.00 %, 13.00 ft / 3.96 m, 13.00 ft / 3.96 m - Average freeboard: 15.69 ft / 4.78 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 169.6 % - Above water (accommodation/working, high = better): 176.0 % Waterplane Area: 7,425 Square feet or 690 Square metres Displacement factor (Displacement / loading): 73 % Structure weight / hull surface area: 33 lbs/sq ft or 159 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.45 - Longitudinal: 2.25 - Overall: 0.53 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Monday, August 20, 2007
We should be able to do better: GB/DD/1921 small and somewhat fast
I wanted to see what could be done with a smaller British destroyer for 1921. I was able to achieve a 35 knot speed with 4-4.7in QF, 6-2pdr AA guns, and 6-21in TT. We should be able to achieve a higher speed than this. This is the Springsharp report:
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