GB/CB/1905 design study B1, Great Britain Battlecruiser laid down 1905 Displacement: 29,113 t light; 30,087 t standard; 34,666 t normal; 38,329 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, all raised mounts - superfiring 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 6,156 lbs / 2,792 kg Shells per gun, main battery: 80 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 6.00" / 152 mm 500.00 ft / 152.40 m 16.00 ft / 4.88 m Ends: Unarmoured Main Belt covers 100 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.50" / 38 mm 500.00 ft / 152.40 m 23.00 ft / 7.01 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 10.0" / 254 mm 4.00" / 102 mm 8.00" / 203 mm 2nd: 2.00" / 51 mm - - - Armour deck: 2.50" / 64 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 123,075 shp / 91,814 Kw = 29.00 kts Range 7,500nm at 15.00 kts Bunker at max displacement = 8,242 tons Complement: 1,269 - 1,651 Cost: £2.971 million / $11.883 million Distribution of weights at normal displacement: Armament: 770 tons, 2.2 % Armour: 6,654 tons, 19.2 % - Belts: 2,033 tons, 5.9 % - Torpedo bulkhead: 638 tons, 1.8 % - Armament: 1,528 tons, 4.4 % - Armour Deck: 2,454 tons, 7.1 % - Conning Tower: 0 tons, 0.0 % Machinery: 9,324 tons, 26.9 % Hull, fittings & equipment: 12,366 tons, 35.7 % Fuel, ammunition & stores: 5,553 tons, 16.0 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 40,932 lbs / 18,566 Kg = 47.4 x 12.0 " / 305 mm shells or 4.0 torpedoes Stability (Unstable if below 1.00): 1.19 Metacentric height 5.4 ft / 1.7 m Roll period: 15.3 seconds Steadiness - As gun platform (Average = 50 %): 83 % - Recoil effect (Restricted arc if above 1.00): 0.79 Seaboat quality (Average = 1.00): 1.66 Hull form characteristics: Hull has raised forecastle, rise forward of midbreak Block coefficient: 0.713 Length to Beam Ratio: 9.06 : 1 'Natural speed' for length: 27.75 kts Power going to wave formation at top speed: 51 % 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: 37.00 ft / 11.28 m - Forecastle (20 %): 34.00 ft / 10.36 m (33.00 ft / 10.06 m aft of break) - Mid (73 %): 32.00 ft / 9.75 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: 30.21 ft / 9.21 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 135.9 % - Above water (accommodation/working, high = better): 243.4 % Waterplane Area: 53,069 Square feet or 4,930 Square metres Displacement factor (Displacement / loading): 110 % Structure weight / hull surface area: 151 lbs/sq ft or 738 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.97 - Longitudinal: 1.36 - 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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Saturday, January 15, 2005
I was just looking at my alternate design for the GB/CB/1905 battlecruises
I was looking at what I had proposed to my friend Cliff for the GB/CB/1905 battlecruisers. This is a ship that would be more acceptable to Frank Fox and D.K. Brown than what Cliff wanted to have. This ship has 6-12in/45 guns with the same 9-6in/50 QF guns mounted on deck. The armor, in this case, is a 6in belt, 16ft high, a 2.5in deck, and 10in turret faces and 8in barbettes for the 12in guns. I was only able to achieve 29 knots in Springsharp, but that is still not too bad for 1905. When you realize that the Invincibles also had a 6 gun broadside, this looks pretty good, except that the cost would have been unacceptable. The size ballooned all out of proportion, but the resulting ship is a good seaboat and has good stability. I realized that the belt was too short, so that grew to 500 ft long. Springsharp is still complaining, but I am happy, as the light and standard displacement aren't so out of line. Mostly, the range I specified is driving up the normal and maximum displacements.
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