GB/CB/1905a2, Great Britain Battlecruiser laid down 1905 (Engine 1906) Displacement: 26,518 t light; 27,124 t standard; 30,290 t normal; 32,823 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: 4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1905 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, all raised mounts 9 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model Quick firing guns in deck mounts on side, evenly spread, all raised mounts Weight of broadside 4,428 lbs / 2,009 kg Shells per gun, main battery: 0 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 4.00" / 102 mm 460.00 ft / 140.21 m 20.00 ft / 6.10 m Ends: Unarmoured Main Belt covers 92 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.50" / 38 mm 460.00 ft / 140.21 m 25.00 ft / 7.62 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: 2.00" / 51 mm - - - Armour deck: 2.00" / 51 mm, Conning tower: 10.00" / 254 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 142,369 shp / 106,207 Kw = 31.00 kts Range 6,000nm at 15.00 kts Bunker at max displacement = 5,700 tons Complement: 1,147 - 1,492 Cost: £2.687 million / $10.749 million Distribution of weights at normal displacement: Armament: 554 tons, 1.8 % Armour: 5,256 tons, 17.4 % - Belts: 1,576 tons, 5.2 % - Torpedo bulkhead: 638 tons, 2.1 % - Armament: 1,023 tons, 3.4 % - Armour Deck: 1,809 tons, 6.0 % - Conning Tower: 209 tons, 0.7 % Machinery: 9,245 tons, 30.5 % Hull, fittings & equipment: 11,463 tons, 37.8 % Fuel, ammunition & stores: 3,772 tons, 12.5 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 32,682 lbs / 14,824 Kg = 37.8 x 12.0 " / 305 mm shells or 3.3 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 %): 81 % - Recoil effect (Restricted arc if above 1.00): 0.59 Seaboat quality (Average = 1.00): 1.62 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.623 Length to Beam Ratio: 9.06 : 1 'Natural speed' for length: 27.75 kts Power going to wave formation at top speed: 53 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): -1.00 degrees Stern overhang: -2.00 ft / -0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 35.00 ft / 10.67 m - Forecastle (20 %): 33.00 ft / 10.06 m - Mid (81 %): 32.00 ft / 9.75 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: 30.39 ft / 9.26 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 146.4 % - Above water (accommodation/working, high = better): 257.7 % Waterplane Area: 48,905 Square feet or 4,543 Square metres Displacement factor (Displacement / loading): 108 % Structure weight / hull surface area: 148 lbs/sq ft or 721 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.95 - Longitudinal: 1.53 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent Ship has slow, easy roll, a good, steady gun platform Excellent seaboat, comfortable, can fire her guns in the heaviest weather
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Wednesday, January 05, 2005
To get the GB/CB/1905 up to the originally intended speed, the design had to be greatly inflated
I decided to see what it would take to get the GB/CB/1905 battlecruiser design up to at least 31 knots. The goal was to get the coveted "Design well balanced for a battleship or cruiser" rating. To do that, I had to inflate the displacement to 30,290 tons normal displacement. The standard displacement doesn't look so bad: 27,124 tons. This is the report, which has all the relevant details:
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