GB/CA/1935, Great Britain Heavy Cruiser laid down 1935 Displacement: 17,212 t light; 17,931 t standard; 19,450 t normal; 20,665 t full load Dimensions: Length overall / water x beam x draught 694.00 ft / 694.00 ft x 68.00 ft x 25.00 ft (normal load) 211.53 m / 211.53 m x 20.73 m x 7.62 m Armament: 12 - 8.00" / 203 mm guns (4x3 guns), 256.00lbs / 116.12kg shells, 1935 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, 2 raised mounts - superfiring 12 - 4.70" / 119 mm guns (6x2 guns), 51.91lbs / 23.55kg shells, 1935 Model Dual purpose guns in turrets (on barbettes) on side, all amidships 40 - 1.57" / 40.0 mm guns (10x4 guns), 1.95lbs / 0.89kg shells, 1935 Model Anti-aircraft guns in deck mounts on side, evenly spread Weight of broadside 3,773 lbs / 1,711 kg Shells per gun, main battery: 150 16 - 21.0" / 533.4 mm above water torpedoes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 5.00" / 127 mm 640.00 ft / 195.07 m 5.00 ft / 1.52 m Ends: Unarmoured Main Belt covers 142 % of normal length - Torpedo Bulkhead: 1.00" / 25 mm 640.00 ft / 195.07 m 24.00 ft / 7.32 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 6.00" / 152 mm 3.00" / 76 mm 6.00" / 152 mm 2nd: 2.00" / 51 mm 2.00" / 51 mm 2.00" / 51 mm 3rd: 1.00" / 25 mm - - - Armour deck: 4.00" / 102 mm, Conning tower: 6.00" / 152 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 154,269 shp / 115,084 Kw = 35.00 kts Range 8,500nm at 15.00 kts Bunker at max displacement = 2,735 tons Complement: 823 - 1,070 Cost: £8.207 million / $32.829 million Distribution of weights at normal displacement: Armament: 472 tons, 2.4 % Armour: 4,962 tons, 25.5 % - Belts: 633 tons, 3.3 % - Torpedo bulkhead: 568 tons, 2.9 % - Armament: 1,063 tons, 5.5 % - Armour Deck: 2,604 tons, 13.4 % - Conning Tower: 93 tons, 0.5 % Machinery: 4,383 tons, 22.5 % Hull, fittings & equipment: 7,396 tons, 38.0 % Fuel, ammunition & stores: 2,238 tons, 11.5 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 24,658 lbs / 11,185 Kg = 96.3 x 8.0 " / 203 mm shells or 3.0 torpedoes Stability (Unstable if below 1.00): 1.09 Metacentric height 3.3 ft / 1.0 m Roll period: 15.7 seconds Steadiness - As gun platform (Average = 50 %): 51 % - Recoil effect (Restricted arc if above 1.00): 0.69 Seaboat quality (Average = 1.00): 1.02 Hull form characteristics: Hull has a flush deck and transom stern Block coefficient: 0.577 Length to Beam Ratio: 10.21 : 1 'Natural speed' for length: 29.78 kts Power going to wave formation at top speed: 59 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 0.00 degrees Stern overhang: 0.00 ft / 0.00 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 31.00 ft / 9.45 m - Forecastle (20 %): 24.00 ft / 7.32 m - Mid (50 %): 24.00 ft / 7.32 m - Quarterdeck (15 %): 24.00 ft / 7.32 m - Stern: 24.00 ft / 7.32 m - Average freeboard: 24.56 ft / 7.49 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 130.8 % - Above water (accommodation/working, high = better): 149.8 % Waterplane Area: 35,189 Square feet or 3,269 Square metres Displacement factor (Displacement / loading): 111 % Structure weight / hull surface area: 129 lbs/sq ft or 628 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.97 - 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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Tuesday, December 20, 2005
The GB/CA/1935 design
The GB/CA/1935 design consolidates the progress made up to the previous design. The armour basis is now 5in and the range is 8,500nm at 15 knots. The maximum speed of 35 knots is competitive with the Japanese ships and probably is better, in that a larger ship with a higher freeboard will maintain its speed better in a seaway. This design can also hit harder than the Japanese, except for the torpedo situation. At least this design is said to be good for 3 torpedo hits, although perhaps of the 21in sort. This is the Springsharp report:
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