\GB/BB/1906, Great Britain Battlecruiser laid down 1906 (Engine 1911) Displacement: 20,854 t light; 21,808 t standard; 26,192 t normal; 29,700 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (645.00 ft / 638.00 ft) x 82.00 ft x (27.00 / 30.07 ft) (196.60 m / 194.46 m) x 24.99 m x (8.23 / 9.16 m) Armament: 8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 100 per gun Breech loading guns in turret on barbette mounts, 1906 Model 4 x Twin mounts on centreline ends, evenly spread 2 raised mounts - superfiring 16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun Quick firing guns in casemate mounts, 1906 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: 8.00" / 203 mm 430.00 ft / 131.06 m 9.00 ft / 2.74 m Ends: Unarmoured Upper: 6.00" / 152 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m Main Belt covers 104 % of normal length - Torpedo Bulkhead - Additional damage containing bulkheads: 2.00" / 51 mm 430.00 ft / 131.06 m 27.00 ft / 8.23 m Beam between torpedo bulkheads 56.00 ft / 17.07 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 10.0" / 254 mm 8.00" / 203 mm 10.0" / 254 mm 2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armoured deck - multiple decks: For and Aft decks: 2.00" / 51 mm Forecastle: 2.00" / 51 mm Quarter deck: 2.00" / 51 mm - Conning towers: Forward 11.00" / 279 mm, Aft 8.00" / 203 mm Machinery: Coal fired boilers, steam turbines, Direct drive, 4 shafts, 82,731 shp / 61,717 Kw = 27.00 kts Range 7,500nm at 16.00 kts Bunker at max displacement = 7,891 tons (100% coal) Complement: 1,029 - 1,338 Cost: £1.923 million / $7.691 million Distribution of weights at normal displacement: Armament: 1,331 tons, 5.1 % - Guns: 1,331 tons, 5.1 % Armour: 7,070 tons, 27.0 % - Belts: 2,188 tons, 8.4 % - Torpedo bulkhead: 859 tons, 3.3 % - Armament: 2,171 tons, 8.3 % - Armour Deck: 1,491 tons, 5.7 % - Conning Towers: 361 tons, 1.4 % Machinery: 3,693 tons, 14.1 % Hull, fittings & equipment: 8,759 tons, 33.4 % Fuel, ammunition & stores: 5,338 tons, 20.4 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 42,557 lbs / 19,303 Kg = 49.3 x 12.0 " / 305 mm shells or 6.1 torpedoes Stability (Unstable if below 1.00): 1.12 Metacentric height 4.6 ft / 1.4 m Roll period: 16.0 seconds Steadiness - As gun platform (Average = 50 %): 65 % - Recoil effect (Restricted arc if above 1.00): 0.82 Seaboat quality (Average = 1.00): 1.29 Hull form characteristics: Hull has low quarterdeck , a ram bow and a cruiser stern Block coefficient (normal/deep): 0.649 / 0.661 Length to Beam Ratio: 7.78 : 1 'Natural speed' for length: 25.26 kts Power going to wave formation at top speed: 53 % 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 (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 25.00 %, 29.00 ft / 8.84 m, 27.00 ft / 8.23 m - Forward deck: 30.00 %, 27.00 ft / 8.23 m, 26.00 ft / 7.92 m - Aft deck: 14.00 %, 26.00 ft / 7.92 m, 26.00 ft / 7.92 m - Quarter deck: 31.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m - Average freeboard: 24.12 ft / 7.35 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 102.2 % - Above water (accommodation/working, high = better): 195.2 % Waterplane Area: 40,040 Square feet or 3,720 Square metres Displacement factor (Displacement / loading): 125 % Structure weight / hull surface area: 155 lbs/sq ft or 758 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.95 - Longitudinal: 1.52 - Overall: 1.00 Adequate machinery, storage, compartmentation space Excellent accommodation and workspace room Good seaboat, rides out heavy weather easily
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Saturday, May 10, 2008
The battlecruiser analog of the GB/BB/1906: the GB/CB/1906
The battlecruiser version of the GB/BB/1906 naturally has lighter armour and higher speed. The lower belt is still 8in thick, so it is not another Invincible. The speed is also higher at 27 knots (although I had heard that an invincible might be able to make higher speed). The ships have 8-12in/45 and 16-4in QF guns. This is the Springsharp report:
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