GB/CL/1912 Fast, Great Britain Light Cruiser laid down 1912 Displacement: 4,167 t light; 4,305 t standard; 4,850 t normal; 5,286 t full load Dimensions: Length overall / water x beam x draught 443.75 ft / 440.00 ft x 44.00 ft x 15.00 ft (normal load) 135.25 m / 134.11 m x 13.41 m x 4.57 m Armament: 6 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1912 Model Quick firing guns in deck mounts with hoists on centreline ends, evenly spread 2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1912 Model Anti-aircraft guns in deck mounts on side, evenly spread Weight of broadside 402 lbs / 182 kg Shells per gun, main battery: 180 4 - 21.0" / 533.4 mm above water torpedoes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 3.00" / 76 mm 310.00 ft / 94.49 m 12.00 ft / 3.66 m Ends: Unarmoured Main Belt covers 108 % of normal length - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 3.00" / 76 mm - - - Armour deck: 2.00" / 51 mm, Conning tower: 3.00" / 76 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 2 shafts, 37,013 shp / 27,611 Kw = 28.00 kts Range 4,250nm at 15.00 kts Bunker at max displacement = 981 tons Complement: 289 - 377 Cost: £0.395 million / $1.579 million Distribution of weights at normal displacement: Armament: 50 tons, 1.0 % Armour: 1,046 tons, 21.6 % - Belts: 460 tons, 9.5 % - Torpedo bulkhead: 0 tons, 0.0 % - Armament: 51 tons, 1.0 % - Armour Deck: 516 tons, 10.6 % - Conning Tower: 19 tons, 0.4 % Machinery: 1,476 tons, 30.4 % Hull, fittings & equipment: 1,595 tons, 32.9 % Fuel, ammunition & stores: 683 tons, 14.1 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 5,442 lbs / 2,468 Kg = 87.1 x 5.0 " / 127 mm shells or 1.0 torpedoes Stability (Unstable if below 1.00): 1.32 Metacentric height 2.4 ft / 0.7 m Roll period: 11.9 seconds Steadiness - As gun platform (Average = 50 %): 59 % - Recoil effect (Restricted arc if above 1.00): 0.21 Seaboat quality (Average = 1.00): 1.18 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.585 Length to Beam Ratio: 10.00 : 1 'Natural speed' for length: 20.98 kts Power going to wave formation at top speed: 59 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 4.00 degrees Stern overhang: 2.00 ft / 0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 25.00 ft / 7.62 m - Forecastle (20 %): 21.00 ft / 6.40 m - Mid (37 %): 21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break) - Quarterdeck (15 %): 13.00 ft / 3.96 m - Stern: 13.00 ft / 3.96 m - Average freeboard: 16.28 ft / 4.96 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 107.2 % - Above water (accommodation/working, high = better): 119.1 % Waterplane Area: 13,956 Square feet or 1,297 Square metres Displacement factor (Displacement / loading): 110 % Structure weight / hull surface area: 68 lbs/sq ft or 333 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - Longitudinal: 1.51 - Overall: 1.00 Hull space for machinery, storage, compartmentation is adequate Room for accommodation and workspaces is adequate
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Sunday, October 30, 2005
My smaller, faster 1912 British Light Cruiser design
I wanted to see what might done on a smaller displacement that could reach 28 knots. I armed the resulting design with 6-5in QF guns, 2-3in AA guns, and 4-21in TT above water. The armour basis is 3in with a 1in deck. The gun shields are 3in, as well. This is the Springsharp report:
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