GB/CL/1918, Great Britain Light Cruiser laid down 1918 (Engine 1927) Displacement: 10,881 t light; 11,287 t standard; 12,812 t normal; 14,031 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (618.44 ft / 615.00 ft) x 62.00 ft x (20.00 / 21.55 ft) (188.50 m / 187.45 m) x 18.90 m x (6.10 / 6.57 m) Armament: 8 - 7.50" / 191 mm 50.0 cal guns - 200.00lbs / 90.72kg shells, 150 per gun Breech loading guns in turret on barbette mounts, 1918 Model 4 x Twin mounts on centreline ends, evenly spread 2 raised mounts - superfiring 8 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 0 per gun Quick firing guns in deck and hoist mounts, 1918 Model 8 x Single mounts on sides, aft deck forward 8 raised mounts Weight of broadside 1,856 lbs / 842 kg 12 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.413 t each, 16.958 t total In 4 sets of deck mounted side rotating tubes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 3.00" / 76 mm 410.00 ft / 124.97 m 8.00 ft / 2.44 m Ends: Unarmoured Upper: 2.00" / 51 mm 360.00 ft / 109.73 m 8.00 ft / 2.44 m Main Belt covers 103 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 0.70" / 18 mm 410.00 ft / 124.97 m 20.00 ft / 6.10 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 4.00" / 102 mm 3.00" / 76 mm 4.00" / 102 mm 2nd: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm - Protected deck - single deck: 2.00" / 51 mm For and Aft decks Forecastle: 2.00" / 51 mm Quarter deck: 2.00" / 51 mm - Conning towers: Forward 4.00" / 102 mm, Aft 0.00" / 0 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 101,121 shp / 75,436 Kw = 32.00 kts Range 8,500nm at 16.00 kts Bunker at max displacement = 2,744 tons Complement: 601 - 782 Cost: £2.078 million / $8.313 million Distribution of weights at normal displacement: Armament: 535 tons, 4.2 % - Guns: 518 tons, 4.0 % - Torpedoes: 17 tons, 0.1 % Armour: 2,426 tons, 18.9 % - Belts: 646 tons, 5.0 % - Torpedo bulkhead: 212 tons, 1.7 % - Armament: 494 tons, 3.9 % - Armour Deck: 1,027 tons, 8.0 % - Conning Tower: 47 tons, 0.4 % Machinery: 3,192 tons, 24.9 % Hull, fittings & equipment: 4,728 tons, 36.9 % Fuel, ammunition & stores: 1,931 tons, 15.1 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 17,533 lbs / 7,953 Kg = 83.1 x 7.5 " / 191 mm shells or 2.2 torpedoes Stability (Unstable if below 1.00): 1.11 Metacentric height 3.0 ft / 0.9 m Roll period: 15.0 seconds Steadiness - As gun platform (Average = 50 %): 57 % - Recoil effect (Restricted arc if above 1.00): 0.56 Seaboat quality (Average = 1.00): 1.14 Hull form characteristics: Hull has low quarterdeck , a normal bow and a cruiser stern Block coefficient (normal/deep): 0.588 / 0.598 Length to Beam Ratio: 9.92 : 1 'Natural speed' for length: 24.80 kts Power going to wave formation at top speed: 58 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 7.00 degrees Stern overhang: -2.00 ft / -0.61 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 25.00 %, 28.00 ft / 8.53 m, 25.00 ft / 7.62 m - Forward deck: 25.00 %, 25.00 ft / 7.62 m, 24.00 ft / 7.32 m - Aft deck: 21.00 %, 24.00 ft / 7.32 m, 24.00 ft / 7.32 m - Quarter deck: 29.00 %, 16.00 ft / 4.88 m, 17.00 ft / 5.18 m - Average freeboard: 22.50 ft / 6.86 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 141.9 % - Above water (accommodation/working, high = better): 208.4 % Waterplane Area: 27,576 Square feet or 2,562 Square metres Displacement factor (Displacement / loading): 118 % Structure weight / hull surface area: 111 lbs/sq ft or 541 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - Longitudinal: 1.42 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Wednesday, February 20, 2008
A 7.5in gunned ship from the same design family
This is the GB/CL/1918 design with 8-7.5in guns. The ship is from the same design family as the others in this series, but has 7.5in guns in turrets, which is one major departure. This is the Springsharp report:
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