GB/BB/1912 a2, Great Britain Battleship laid down 1912 (Engine 1917) Displacement: 37,282 t light; 38,970 t standard; 42,620 t normal; 45,539 t full load Dimensions: Length overall / water x beam x draught 700.00 ft / 700.00 ft x 105.00 ft x 33.00 ft (normal load) 213.36 m / 213.36 m x 32.00 m x 10.06 m Armament: 9 - 15.00" / 381 mm guns (3x3 guns), 1,687.50lbs / 765.44kg shells, 1912 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, all raised mounts - superfiring 12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model Quick firing guns in deck mounts with hoists on side, evenly spread, all raised mounts Weight of broadside 16,484 lbs / 7,477 kg Shells per gun, main battery: 90 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 14.0" / 356 mm 460.00 ft / 140.21 m 16.00 ft / 4.88 m Ends: Unarmoured Main Belt covers 101 % of normal length - Torpedo Bulkhead: 2.00" / 51 mm 460.00 ft / 140.21 m 27.00 ft / 8.23 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 14.0" / 356 mm 8.00" / 203 mm 13.0" / 330 mm 2nd: 2.00" / 51 mm - - - Armour deck: 7.00" / 178 mm, Conning tower: 9.00" / 229 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 80,283 shp / 59,891 Kw = 25.00 kts Range 9,600nm at 15.00 kts Bunker at max displacement = 6,569 tons Complement: 1,483 - 1,928 Cost: £3.448 million / $13.791 million Distribution of weights at normal displacement: Armament: 2,060 tons, 4.8 % Armour: 16,317 tons, 38.3 % - Belts: 4,483 tons, 10.5 % - Torpedo bulkhead: 919 tons, 2.2 % - Armament: 3,619 tons, 8.5 % - Armour Deck: 7,060 tons, 16.6 % - Conning Tower: 237 tons, 0.6 % Machinery: 2,943 tons, 6.9 % Hull, fittings & equipment: 15,963 tons, 37.5 % Fuel, ammunition & stores: 5,337 tons, 12.5 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 63,315 lbs / 28,719 Kg = 37.5 x 15.0 " / 381 mm shells or 10.8 torpedoes Stability (Unstable if below 1.00): 1.03 Metacentric height 5.7 ft / 1.7 m Roll period: 18.4 seconds Steadiness - As gun platform (Average = 50 %): 70 % - Recoil effect (Restricted arc if above 1.00): 0.74 Seaboat quality (Average = 1.00): 1.55 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.615 Length to Beam Ratio: 6.67 : 1 'Natural speed' for length: 26.46 kts Power going to wave formation at top speed: 48 % Trim (Max stability = 0, Max steadiness = 100): 45 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: 31.00 ft / 9.45 m - Forecastle (67 %): 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: 26.16 ft / 7.97 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 73.1 % - Above water (accommodation/working, high = better): 140.0 % Waterplane Area: 54,514 Square feet or 5,064 Square metres Displacement factor (Displacement / loading): 110 % Structure weight / hull surface area: 204 lbs/sq ft or 994 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.94 - Longitudinal: 1.73 - Overall: 1.00 Hull space for machinery, storage, compartmentation is excellent 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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Monday, February 28, 2005
I reconsidered the GB/BB/1912 design
I would like to think that it would be fair game to allow for a higher speed for the GB/BB/1912 design, while the nominal speed is 22 knots, to allow for 25 knots. The "natural speed", according to Springsharp, is 26.46 knots, so 25 knots is still "underperforming". I also have been vascillating about my reading of the sketch records from 1971, and decided that my original estimate of the secondary armament as 12-6in QF guns was more likely to be correct, and that the one spot where there was a 14/6 reference, that it was Belt/Deck armor. Eventually, the deck armor was 7in, as my cross sectional drawing indicates. This is the revised Springsharp report:
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