GB/CB/1907, Great Britain Battlecruiser laid down 1907 (Engine 1914) Displacement: 23,503 t light; 24,248 t standard; 25,780 t normal; 27,005 t full load Dimensions: Length overall / water x beam x draught 770.00 ft / 770.00 ft x 90.00 ft x 28.00 ft (normal load) 234.70 m / 234.70 m x 27.43 m x 8.53 m Armament: 4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1907 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, 1907 Model Quick firing guns in deck mounts with hoists on side, all aft, all raised mounts - superfiring Weight of broadside 4,428 lbs / 2,009 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 17.00 ft / 5.18 m Ends: Unarmoured Main Belt covers 93 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.50" / 38 mm 465.00 ft / 141.73 m 25.00 ft / 7.62 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 9.00" / 229 mm 6.00" / 152 mm 9.00" / 229 mm 2nd: 2.00" / 51 mm - - - Armour deck: 3.00" / 76 mm, Conning tower: 7.00" / 178 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 155,110 shp / 115,712 Kw = 33.00 kts Range 7,500nm at 12.00 kts Bunker at max displacement = 2,757 tons Complement: 1,016 - 1,322 Cost: £2.124 million / $8.496 million Distribution of weights at normal displacement: Armament: 554 tons, 2.1 % Armour: 6,371 tons, 24.7 % - Belts: 2,024 tons, 7.9 % - Torpedo bulkhead: 645 tons, 2.5 % - Armament: 1,085 tons, 4.2 % - Armour Deck: 2,484 tons, 9.6 % - Conning Tower: 132 tons, 0.5 % Machinery: 5,975 tons, 23.2 % Hull, fittings & equipment: 10,604 tons, 41.1 % Fuel, ammunition & stores: 2,277 tons, 8.8 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 31,393 lbs / 14,240 Kg = 36.3 x 12.0 " / 305 mm shells or 4.2 torpedoes Stability (Unstable if below 1.00): 1.14 Metacentric height 5.5 ft / 1.7 m Roll period: 16.2 seconds Steadiness - As gun platform (Average = 50 %): 72 % - Recoil effect (Restricted arc if above 1.00): 0.38 Seaboat quality (Average = 1.00): 1.45 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.465 Length to Beam Ratio: 8.56 : 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: 33.00 ft / 10.06 m - Forecastle (72 %): 30.00 ft / 9.14 m - Mid (72 %): 30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break) - Quarterdeck (15 %): 22.00 ft / 6.71 m - Stern: 22.00 ft / 6.71 m - Average freeboard: 28.62 ft / 8.72 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 117.9 % - Above water (accommodation/working, high = better): 184.6 % Waterplane Area: 44,763 Square feet or 4,159 Square metres Displacement factor (Displacement / loading): 113 % Structure weight / hull surface area: 151 lbs/sq ft or 735 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - 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 Good seaboat, rides out heavy weather easily
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Wednesday, February 16, 2005
I don't understand why this is so "good": GB/CB/1907
I really don't understand why this design is so "good" in Springsharp, or why it was so easy to optimize. This is the 12in/50 gunned version of the basic light British battlecruiser type that my friend Cliff designed in 1971. The original two ships were to have 4-12in/45 guns while the follow-on ships were to have 12in/50 guns. I had assumed that they would be larger and could have had better protection.
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