GB/CB/1921 48,000 tons, Great Britain Battlecruiser laid down 1921 (Engine 1937) Displacement: 43,640 t light; 45,621 t standard; 49,250 t normal; 52,153 t full load Dimensions: Length overall / water x beam x draught 856.57 ft / 855.00 ft x 105.00 ft x 33.30 ft (normal load) 261.08 m / 260.60 m x 32.00 m x 10.15 m Armament: 9 - 16.00" / 406 mm guns (3x3 guns), 2,048.00lbs / 928.96kg shells, 1921 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring 20 - 5.00" / 127 mm guns (10x2 guns), 62.00lbs / 28.12kg shells, 1921 Model Quick firing guns in turrets (on barbettes) on side, all amidships, 4 raised mounts - superfiring Weight of broadside 19,672 lbs / 8,923 kg Shells per gun, main battery: 90 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 14.0" / 356 mm 555.00 ft / 169.16 m 17.00 ft / 5.18 m Ends: Unarmoured Main Belt covers 100 % of normal length - Torpedo Bulkhead: 2.00" / 51 mm 555.00 ft / 169.16 m 29.00 ft / 8.84 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 14.0" / 356 mm 9.00" / 229 mm 14.0" / 356 mm 2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armour deck: 5.00" / 127 mm, Conning tower: 12.00" / 305 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 161,252 shp / 120,294 Kw = 30.00 kts Range 7,500nm at 18.00 kts Bunker at max displacement = 6,532 tons Complement: 1,652 - 2,148 Cost: £10.741 million / $42.964 million Distribution of weights at normal displacement: Armament: 2,460 tons, 5.0 % Armour: 17,357 tons, 35.2 % - Belts: 5,627 tons, 11.4 % - Torpedo bulkhead: 1,191 tons, 2.4 % - Armament: 4,250 tons, 8.6 % - Armour Deck: 5,942 tons, 12.1 % - Conning Tower: 347 tons, 0.7 % Machinery: 4,469 tons, 9.1 % Hull, fittings & equipment: 19,353 tons, 39.3 % Fuel, ammunition & stores: 5,610 tons, 11.4 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 71,719 lbs / 32,531 Kg = 35.0 x 16.0 " / 406 mm shells or 10.6 torpedoes Stability (Unstable if below 1.00): 1.08 Metacentric height 6.2 ft / 1.9 m Roll period: 17.7 seconds Steadiness - As gun platform (Average = 50 %): 62 % - Recoil effect (Restricted arc if above 1.00): 0.78 Seaboat quality (Average = 1.00): 1.24 Hull form characteristics: Hull has a flush deck Block coefficient: 0.577 Length to Beam Ratio: 8.14 : 1 'Natural speed' for length: 29.24 kts Power going to wave formation at top speed: 49 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 3.00 degrees Stern overhang: -2.00 ft / -0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 30.00 ft / 9.14 m - Forecastle (20 %): 24.00 ft / 7.32 m - Mid (50 %): 24.00 ft / 7.32 m - Quarterdeck (15 %): 24.00 ft / 7.32 m - Stern: 24.00 ft / 7.32 m - Average freeboard: 24.48 ft / 7.46 m Ship tends to be wet forward Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 83.1 % - Above water (accommodation/working, high = better): 177.8 % Waterplane Area: 64,237 Square feet or 5,968 Square metres Displacement factor (Displacement / loading): 107 % Structure weight / hull surface area: 210 lbs/sq ft or 1,026 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.98 - Longitudinal: 1.20 - Overall: 1.00 Hull space for machinery, storage, compartmentation is excellent Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Wednesday, June 22, 2005
A rework of my "48,000 ton battlecruiser" design
Well, this is only nominally a 48,000 ton ship, as my Springsharp design came out heavier, due to structural strength needs. The design is for a ship of 855ft x 105ft x 33.3ft with a speed of 30 knots. The armament is 9-16in/45 BLR and 20-5in QF guns. The armor basis is 14inches. This is the Springsharp report:
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