GB/CB/1905 design study, Great Britain Battlecruiser laid down 1905 (Engine 1909) Displacement: 23,431 t light; 24,289 t standard; 27,400 t normal; 29,889 t full load Dimensions: Length overall / water x beam x draught 770.00 ft / 770.00 ft x 85.00 ft x 26.00 ft (normal load) 234.70 m / 234.70 m x 25.91 m x 7.92 m Armament: 6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring 8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model Quick firing guns in deck mounts with hoists on side, evenly spread Weight of broadside 6,048 lbs / 2,743 kg Shells per gun, main battery: 90 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 6.00" / 152 mm 465.00 ft / 141.73 m 8.00 ft / 2.44 m Ends: Unarmoured Upper: 4.00" / 102 mm 465.00 ft / 141.73 m 8.00 ft / 2.44 m Main Belt covers 93 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 2.00" / 51 mm 465.00 ft / 141.73 m 26.00 ft / 7.92 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 10.0" / 254 mm 6.00" / 152 mm 8.00" / 203 mm 2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 139,103 shp / 103,771 Kw = 31.50 kts Range 7,500nm at 15.00 kts Bunker at max displacement = 5,600 tons Complement: 1,064 - 1,384 Cost: £2.340 million / $9.361 million Distribution of weights at normal displacement: Armament: 756 tons, 2.8 % Armour: 5,731 tons, 20.9 % - Belts: 1,586 tons, 5.8 % - Torpedo bulkhead: 895 tons, 3.3 % - Armament: 1,421 tons, 5.2 % - Armour Deck: 1,712 tons, 6.2 % - Conning Tower: 117 tons, 0.4 % Machinery: 6,323 tons, 23.1 % Hull, fittings & equipment: 10,622 tons, 38.8 % Fuel, ammunition & stores: 3,969 tons, 14.5 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 35,342 lbs / 16,031 Kg = 40.9 x 12.0 " / 305 mm shells or 4.2 torpedoes Stability (Unstable if below 1.00): 1.21 Metacentric height 5.6 ft / 1.7 m Roll period: 15.1 seconds Steadiness - As gun platform (Average = 50 %): 66 % - Recoil effect (Restricted arc if above 1.00): 0.53 Seaboat quality (Average = 1.00): 1.32 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.564 Length to Beam Ratio: 9.06 : 1 'Natural speed' for length: 27.75 kts Power going to wave formation at top speed: 52 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): -2.00 degrees Stern overhang: -2.00 ft / -0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 32.00 ft / 9.75 m - Forecastle (20 %): 28.00 ft / 8.53 m - Mid (67 %): 28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break) - Quarterdeck (15 %): 20.00 ft / 6.10 m - Stern: 20.00 ft / 6.10 m - Average freeboard: 25.68 ft / 7.83 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 125.2 % - Above water (accommodation/working, high = better): 213.5 % Waterplane Area: 46,261 Square feet or 4,298 Square metres Displacement factor (Displacement / loading): 112 % Structure weight / hull surface area: 152 lbs/sq ft or 741 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.98 - Longitudinal: 1.20 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Thursday, July 27, 2006
The GB/CB/1905 design study
This is a design study proposed by my friend Cliff for the GB/CB/1905 design. It is really a better ship than what he decided to use. His design study had a 6in belt, 6-12in and 8-6in guns, and a 31 knot speed (he actually hoped to achieve 31.2 knots). When I used his armouring scheme, the weight exceeded what he had planned for the protection weight. This is the Springsharp report:
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