GB/CL/1918, Great Britain Light Cruiser laid down 1918 Displacement: 8,996 t light; 9,290 t standard; 10,200 t normal; 10,928 t full load Dimensions: Length overall / water x beam x draught 556.36 ft / 555.00 ft x 56.00 ft x 20.00 ft (normal load) 169.58 m / 169.16 m x 17.07 m x 6.10 m Armament: 8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1918 Model Quick firing guns in turrets (on barbettes) on centreline ends, evenly spread, 2 raised mounts - superfiring 4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1918 Model Anti-aircraft guns in deck mounts with hoists on side, all amidships 16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1918 Model Breech loading guns in deck mounts on side ends, evenly spread Weight of broadside 1,023 lbs / 464 kg Shells per gun, main battery: 150 8 - 21.0" / 533.4 mm above water torpedoes, 21 - 21.0" / 533.4 mm submerged torpedo tubes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 4.00" / 102 mm 425.00 ft / 129.54 m 12.00 ft / 3.66 m Ends: Unarmoured Main Belt covers 118 % of normal length Main belt does not fully cover magazines and engineering spaces - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 2.00" / 51 mm - 2.00" / 51 mm - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 97,206 shp / 72,515 Kw = 32.50 kts Range 5,800nm at 15.00 kts Bunker at max displacement = 1,639 tons Complement: 506 - 659 Cost: £1.826 million / $7.306 million Distribution of weights at normal displacement: Armament: 128 tons, 1.3 % Armour: 1,835 tons, 18.0 % - Belts: 832 tons, 8.2 % - Torpedo bulkhead: 0 tons, 0.0 % - Armament: 142 tons, 1.4 % - Armour Deck: 821 tons, 8.0 % - Conning Tower: 41 tons, 0.4 % Machinery: 3,507 tons, 34.4 % Hull, fittings & equipment: 3,526 tons, 34.6 % Fuel, ammunition & stores: 1,204 tons, 11.8 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 4,601 lbs / 2,087 Kg = 42.6 x 6.0 " / 152 mm shells or 0.7 torpedoes Stability (Unstable if below 1.00): 1.28 Metacentric height 3.3 ft / 1.0 m Roll period: 13.0 seconds Steadiness - As gun platform (Average = 50 %): 53 % - Recoil effect (Restricted arc if above 1.00): 0.32 Seaboat quality (Average = 1.00): 1.05 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.574 Length to Beam Ratio: 9.91 : 1 'Natural speed' for length: 23.56 kts Power going to wave formation at top speed: 61 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 3.00 degrees Stern overhang: -2.00 ft / -0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 26.00 ft / 7.92 m - Forecastle (20 %): 23.00 ft / 7.01 m - Mid (67 %): 23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break) - Quarterdeck (15 %): 15.00 ft / 4.57 m - Stern: 15.00 ft / 4.57 m - Average freeboard: 20.60 ft / 6.28 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 169.4 % - Above water (accommodation/working, high = better): 142.8 % Waterplane Area: 22,191 Square feet or 2,062 Square metres Displacement factor (Displacement / loading): 103 % Structure weight / hull surface area: 94 lbs/sq ft or 458 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.95 - Longitudinal: 1.56 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Saturday, December 10, 2005
My attempt at a 1918 British light cruiser
Perhaps this is anachronistic, but I thought that having four twin 6in turrets was not unreasonable for a ship laid down in 1918. This is meant to be an incremental advance over my GB/CL/1916 design. It is not a great advance, except for the turrets. There is some increase in speed and range. I couldn't resist a Springsharp-specific "hack" of increasing the draft for more strength and increased seakeeping. This is the Springsharp report:
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