GB/CA/1921, Great Britain Heavy Cruiser laid down 1921 (Engine 1937) Displacement: 13,393 t light; 13,988 t standard; 15,700 t normal; 17,069 t full load Dimensions: Length overall / water x beam x draught 666.36 ft / 665.00 ft x 65.00 ft x 22.00 ft (normal load) 203.11 m / 202.69 m x 19.81 m x 6.71 m Armament: 9 - 9.20" / 234 mm guns (3x3 guns), 389.34lbs / 176.60kg shells, 1921 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring 8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model Quick firing guns in deck mounts with hoists on side, all amidships, all raised mounts - superfiring 4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1921 Model Anti-aircraft guns in deck mounts with hoists on side, all amidships, all raised mounts - superfiring 16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1921 Model Anti-aircraft guns in deck mounts with hoists on side, evenly spread, all raised mounts Weight of broadside 4,079 lbs / 1,850 kg Shells per gun, main battery: 120 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 98 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.00" / 25 mm 425.00 ft / 129.54 m 22.00 ft / 6.71 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 6.00" / 152 mm 4.00" / 102 mm 6.00" / 152 mm 2nd: 2.00" / 51 mm 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, 109,062 shp / 81,360 Kw = 33.00 kts Range 7,500nm at 18.00 kts Bunker at max displacement = 3,081 tons Complement: 700 - 911 Cost: £3.361 million / $13.442 million Distribution of weights at normal displacement: Armament: 510 tons, 3.2 % Armour: 3,267 tons, 20.8 % - Belts: 852 tons, 5.4 % - Torpedo bulkhead: 346 tons, 2.2 % - Armament: 822 tons, 5.2 % - Armour Deck: 1,194 tons, 7.6 % - Conning Tower: 54 tons, 0.3 % Machinery: 3,023 tons, 19.3 % Hull, fittings & equipment: 6,593 tons, 42.0 % Fuel, ammunition & stores: 2,307 tons, 14.7 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 22,006 lbs / 9,982 Kg = 56.5 x 9.2 " / 234 mm shells or 2.8 torpedoes Stability (Unstable if below 1.00): 1.09 Metacentric height 3.1 ft / 0.9 m Roll period: 15.5 seconds Steadiness - As gun platform (Average = 50 %): 55 % - Recoil effect (Restricted arc if above 1.00): 0.91 Seaboat quality (Average = 1.00): 1.10 Hull form characteristics: Hull has a flush deck and transom stern Block coefficient: 0.578 Length to Beam Ratio: 10.23 : 1 'Natural speed' for length: 29.14 kts Power going to wave formation at top speed: 57 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 3.00 degrees Stern overhang: 0.00 ft / 0.00 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 (35 %): 23.00 ft / 7.01 m - Quarterdeck (15 %): 23.00 ft / 7.01 m - Stern: 23.00 ft / 7.01 m - Average freeboard: 23.24 ft / 7.08 m Ship tends to be wet forward Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 126.5 % - Above water (accommodation/working, high = better): 201.9 % Waterplane Area: 32,257 Square feet or 2,997 Square metres Displacement factor (Displacement / loading): 117 % Structure weight / hull surface area: 128 lbs/sq ft or 626 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - Longitudinal: 1.40 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Saturday, November 25, 2006
A 33-knot heavy cruiser with 8-9.2in guns
This is a rather different approach to a 9.2in-gunned, heavy cruiser. The version is designed to make 33 knots. The hull is flush-decked with a transom stern. The main armament is 9-9.2in BLR in triple turrets. The armour basis is 4in with a 2in deck. The cruising range is 7,500nm at 18 knots. The Standard displacement is 13,988 tons. This is the Springsharp report:
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