GB/CB/1909, Great Britain Battlecruiser laid down 1909 Displacement: 24,493 t light; 25,541 t standard; 29,100 t normal; 31,947 t full load Dimensions: Length overall / water x beam x draught 670.00 ft / 670.00 ft x 87.00 ft x 28.00 ft (normal load) 204.22 m / 204.22 m x 26.52 m x 8.53 m Armament: 8 - 13.50" / 343 mm guns (4x2 guns), 1,230.19lbs / 558.00kg shells, 1909 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, 1 raised mount aft - superfiring 16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1909 Model Quick firing guns in casemate mounts on side, evenly spread, 6 raised mounts Weight of broadside 10,354 lbs / 4,696 kg Shells per gun, main battery: 80 4 - 21.0" / 533.4 mm submerged torpedo tubes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 11.0" / 279 mm 450.00 ft / 137.16 m 8.00 ft / 2.44 m Ends: Unarmoured Upper: 8.00" / 203 mm 450.00 ft / 137.16 m 8.00 ft / 2.44 m Main Belt covers 103 % of normal length - Torpedo Bulkhead: 2.00" / 51 mm 450.00 ft / 137.16 m 27.00 ft / 8.23 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 11.0" / 279 mm 8.00" / 203 mm 11.0" / 279 mm 2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armour deck: 3.00" / 76 mm, Conning tower: 11.00" / 279 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 86,024 shp / 64,174 Kw = 27.00 kts Range 5,400nm at 18.00 kts Bunker at max displacement = 6,406 tons Complement: 1,113 - 1,448 Cost: £2.492 million / $9.967 million Distribution of weights at normal displacement: Armament: 1,294 tons, 4.4 % Armour: 8,832 tons, 30.3 % - Belts: 2,919 tons, 10.0 % - Torpedo bulkhead: 899 tons, 3.1 % - Armament: 2,370 tons, 8.1 % - Armour Deck: 2,420 tons, 8.3 % - Conning Tower: 224 tons, 0.8 % Machinery: 3,910 tons, 13.4 % Hull, fittings & equipment: 10,457 tons, 35.9 % Fuel, ammunition & stores: 4,607 tons, 15.8 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 38,281 lbs / 17,364 Kg = 31.1 x 13.5 " / 343 mm shells or 5.4 torpedoes Stability (Unstable if below 1.00): 1.12 Metacentric height 5.0 ft / 1.5 m Roll period: 16.4 seconds Steadiness - As gun platform (Average = 50 %): 63 % - Recoil effect (Restricted arc if above 1.00): 0.75 Seaboat quality (Average = 1.00): 1.26 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.624 Length to Beam Ratio: 7.70 : 1 'Natural speed' for length: 25.88 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: 29.00 ft / 8.84 m - Forecastle (20 %): 25.00 ft / 7.62 m - Mid (67 %): 25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break) - Quarterdeck (15 %): 17.00 ft / 5.18 m - Stern: 17.00 ft / 5.18 m - Average freeboard: 22.68 ft / 6.91 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 102.9 % - Above water (accommodation/working, high = better): 170.0 % Waterplane Area: 43,597 Square feet or 4,050 Square metres Displacement factor (Displacement / loading): 108 % Structure weight / hull surface area: 165 lbs/sq ft or 804 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.97 - Longitudinal: 1.36 - Overall: 1.00 Hull space for machinery, storage, compartmentation is adequate Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Monday, November 28, 2005
A GB/CB/1909 battlecruiser with 11in armour
Perhaps using oil-fired boilers on a British capital ship in 1909 is "cheating", but having them allows for a very potent ship. This is a small-dimension battlecruiser with 8-13.5 guns with the superfiring guns aft. The lower belt, barbettes, and turret faces are 11in thick. The deck is 3in with a 2in torpedo bulkhead. This design is much more capable than the Lion class, but probably only is due to the oil-fired boilers. I also omit armour at the ends, as the unarmoured length is relatively small. This is the Springsharp report:
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