GB/BB/1941, Great Britain Battleship laid down 1941 Displacement: 59,031 t light; 62,186 t standard; 65,325 t normal; 67,836 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (920.54 ft / 915.00 ft) x 120.00 ft x (33.00 / 34.02 ft) (280.58 m / 278.89 m) x 36.58 m x (10.06 / 10.37 m) Armament: 9 - 18.00" / 457 mm 45.0 cal guns - 2,940.86lbs / 1,333.95kg shells, 120 per gun Breech loading guns in turret on barbette mounts , 1941 Model 3 x Triple mounts on centreline ends, majority forward 1 raised mount - superfiring 20 - 4.50" / 114 mm 45.0 cal guns - 45.95lbs / 20.84kg shells, 150 per gun Dual purpose guns in turret on barbette mounts , 1941 Model 6 x Twin mounts on sides, forward evenly spread 6 raised mounts 4 x Twin mounts on sides, aft evenly spread 4 raised mounts 42 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 150 per gun Anti-air guns in deck mounts , 1941 Model 3 x 2 row sextuple mounts on centreline ends, majority aft 2 raised mounts - superfiring 4 x 2 row sextuple mounts on sides, evenly spread 4 raised mounts Weight of broadside 27,469 lbs / 27,469 kg Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 15.0" / 381 mm 570.00 ft / 173.74 m 16.00 ft / 4.88 m Ends: Unarmoured Main Belt covers 96 % of normal length - Torpedo Bulkhead: 4.00" / 102 mm 570.00 ft / 173.74 m 35.00 ft / 10.67 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 16.0" / 406 mm 12.0" / 305 mm 15.0" / 381 mm 2nd: 3.00" / 76 mm 2.00" / 51 mm 3.00" / 76 mm 3rd: 1.00" / 25 mm - - - Armour deck: 7.00" / 178 mm, Conning tower: 12.00" / 305 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 132,552 shp / 98,884 Kw = 28.00 kts Range 8,500nm at 15.00 kts Bunker at max displacement = 5,650 tons Complement: 2,042 - 2,655 Cost: £31.625 million / $126.499 million Distribution of weights at normal displacement: Armament: 4,343 tons, 6.6 % Armour: 25,973 tons, 39.8 % - Belts: 5,932 tons, 9.1 % - Torpedo bulkhead: 2,953 tons, 4.5 % - Armament: 5,507 tons, 8.4 % - Armour Deck: 11,163 tons, 17.1 % - Conning Tower: 419 tons, 0.6 % Machinery: 3,503 tons, 5.4 % Hull, fittings & equipment: 26,508 tons, 40.6 % Fuel, ammunition & stores: 6,294 tons, 9.6 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 127,372 lbs / 57,775 Kg = 43.7 x 18.0 " / 457 mm shells or 26.1 torpedoes Stability (Unstable if below 1.00): 1.14 Metacentric height 8.5 ft / 2.6 m Roll period: 17.3 seconds Steadiness - As gun platform (Average = 50 %): 74 % - Recoil effect (Restricted arc if above 1.00): 0.77 Seaboat quality (Average = 1.00): 1.48 Hull form characteristics: Hull has a flush deck, a normal bow and small transom stern Block coefficient (normal/deep): 0.631 / 0.636 Length to Beam Ratio: 7.63 : 1 'Natural speed' for length: 34.78 kts Power going to wave formation at top speed: 45 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 9.00 degrees Stern overhang: 0.00 ft / 0.00 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 22.00 %, 35.00 ft / 10.67 m, 29.00 ft / 8.84 m - Forward deck: 30.00 %, 29.00 ft / 8.84 m, 25.00 ft / 7.62 m - Aft deck: 33.00 %, 25.00 ft / 7.62 m, 25.00 ft / 7.62 m - Quarter deck: 15.00 %, 25.00 ft / 7.62 m, 25.00 ft / 7.62 m - Average freeboard: 27.01 ft / 8.23 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 64.8 % - Above water (accommodation/working, high = better): 208.7 % Waterplane Area: 86,200 Square feet or 8,008 Square metres Displacement factor (Displacement / loading): 114 % Structure weight / hull surface area: 232 lbs/sq ft or 1,131 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.97 - Longitudinal: 1.22 - 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 Good seaboat, rides out heavy weather easily
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Monday, March 12, 2007
I severely underestimated the displacement needed for the GB/BB/1941 design
While the battlecruiser worked well, I found that I had severely underestimated the displacment needed for a battleship with 9-18in guns and a speed of 28 knots. Unlike the battlecruiser, I included a light AA armament of sextuple 40mm guns. The belt is 15in and the deck is 7in, so the ship is reasonably well-protected. This is the Springsharp report:
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