GB/BB/1905, Great Britain Dreadnought Cruiser laid down 1905 (Engine 1917) Displacement: 20,213 t light; 21,073 t standard; 23,413 t normal; 25,286 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (625.00 ft / 618.00 ft) x 85.00 ft x (26.00 / 27.71 ft) (190.50 m / 188.37 m) x 25.91 m x (7.92 / 8.44 m) Armament: 8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 90 per gun Breech loading guns in turret on barbette mounts, 1905 Model 3 x Twin mounts on centreline ends, evenly spread 1 raised mount aft - superfiring 1 x Twin mount on centreline, forward deck aft 16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun Quick firing guns in casemate mounts, 1905 Model 16 x Single mounts on sides, evenly spread 8 raised mounts Weight of broadside 7,487 lbs / 3,396 kg Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 10.0" / 254 mm 405.00 ft / 123.44 m 9.00 ft / 2.74 m Ends: 4.00" / 102 mm 170.00 ft / 51.82 m 12.00 ft / 3.66 m 43.00 ft / 13.11 m Unarmoured ends Upper: 7.00" / 178 mm 405.00 ft / 123.44 m 8.00 ft / 2.44 m Main Belt covers 101 % of normal length - Torpedo Bulkhead: 2.00" / 51 mm 395.00 ft / 120.40 m 26.00 ft / 7.92 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 10.0" / 254 mm 7.00" / 178 mm 10.0" / 254 mm 2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks Forecastle: 3.00" / 76 mm Quarter deck: 3.00" / 76 mm - Conning towers: Forward 10.00" / 254 mm, Aft 0.00" / 0 mm Machinery: Coal fired boilers, steam turbines, Direct drive, 4 shafts, 66,702 shp / 49,760 Kw = 26.00 kts Range 5,400nm at 16.00 kts Bunker at max displacement = 4,213 tons (100% coal) Complement: 946 - 1,230 Cost: £1.760 million / $7.039 million Distribution of weights at normal displacement: Armament: 1,331 tons, 5.7 % Armour: 7,921 tons, 33.8 % - Belts: 2,836 tons, 12.1 % - Torpedo bulkhead: 760 tons, 3.2 % - Armament: 2,004 tons, 8.6 % - Armour Deck: 2,145 tons, 9.2 % - Conning Tower: 176 tons, 0.8 % Machinery: 2,690 tons, 11.5 % Hull, fittings & equipment: 8,271 tons, 35.3 % Fuel, ammunition & stores: 3,200 tons, 13.7 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 43,692 lbs / 19,818 Kg = 50.6 x 12.0 " / 305 mm shells or 6.9 torpedoes Stability (Unstable if below 1.00): 1.16 Metacentric height 5.2 ft / 1.6 m Roll period: 15.7 seconds Steadiness - As gun platform (Average = 50 %): 71 % - Recoil effect (Restricted arc if above 1.00): 0.72 Seaboat quality (Average = 1.00): 1.41 Hull form characteristics: Hull has low quarterdeck , a ram bow and a cruiser stern Block coefficient (normal/deep): 0.600 / 0.608 Length to Beam Ratio: 7.27 : 1 'Natural speed' for length: 24.86 kts Power going to wave formation at top speed: 52 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): -3.00 degrees Stern overhang: -3.00 ft / -0.91 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 27.00 %, 28.00 ft / 8.53 m, 26.00 ft / 7.92 m - Forward deck: 30.00 %, 26.00 ft / 7.92 m, 26.00 ft / 7.92 m - Aft deck: 10.00 %, 26.00 ft / 7.92 m, 26.00 ft / 7.92 m - Quarter deck: 33.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m - Average freeboard: 23.58 ft / 7.19 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 83.6 % - Above water (accommodation/working, high = better): 201.1 % Waterplane Area: 38,420 Square feet or 3,569 Square metres Displacement factor (Displacement / loading): 119 % Structure weight / hull surface area: 156 lbs/sq ft or 761 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.95 - Longitudinal: 1.64 - Overall: 1.00 Hull space for machinery, storage, compartmentation is adequate Room for accommodation and workspaces is excellent Ship has slow, easy roll, a good, steady gun platform Good seaboat, rides out heavy weather easily
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Monday, January 14, 2008
A big British dreadnought cruiser: the GB/CB/1905
This is the cruiser variant of the battleship-cruiser design. The side armour is thinner and the speed is raised to 26 knots. The armament is 8-12in/45 on the centerline, with a super-firing turret aft. The secondary armament is the same 16-4in QF guns in casemates. The belt is 10in on the waterline. The design depends on lightweight machinery. This is the Springsharp report:
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