Ger/CB/1915, Germany Battlecruiser laid down 1915 (Engine 1937) Displacement: 38,850 t light; 40,455 t standard; 42,750 t normal; 44,586 t full load Dimensions: Length overall / water x beam x draught 901.73 ft / 900.00 ft x 100.00 ft x 30.00 ft (normal load) 274.85 m / 274.32 m x 30.48 m x 9.14 m Armament: 6 - 16.50" / 419 mm guns (2x3 guns), 2,246.06lbs / 1,018.80kg shells, 1915 Model Breech loading guns in turrets (on barbettes) on centreline, all forward, 1 raised mount - superfiring 12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1915 Model Quick firing guns in turrets (on barbettes) on side, all aft Weight of broadside 14,772 lbs / 6,701 kg Shells per gun, main battery: 90 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 9.00" / 229 mm 420.00 ft / 128.02 m 17.00 ft / 5.18 m Ends: Unarmoured Main Belt covers 72 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 3.00" / 76 mm 420.00 ft / 128.02 m 29.00 ft / 8.84 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: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armour deck: 3.00" / 76 mm, Conning tower: 9.00" / 229 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 292,831 shp / 218,452 Kw = 36.00 kts Range 7,500nm at 15.00 kts Bunker at max displacement = 4,132 tons Complement: 1,486 - 1,932 Cost: £5.887 million / $23.547 million Distribution of weights at normal displacement: Armament: 1,847 tons, 4.3 % Armour: 10,159 tons, 23.8 % - Belts: 2,877 tons, 6.7 % - Torpedo bulkhead: 1,352 tons, 3.2 % - Armament: 2,194 tons, 5.1 % - Armour Deck: 3,500 tons, 8.2 % - Conning Tower: 237 tons, 0.6 % Machinery: 8,116 tons, 19.0 % Hull, fittings & equipment: 18,728 tons, 43.8 % Fuel, ammunition & stores: 3,900 tons, 9.1 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 52,051 lbs / 23,610 Kg = 23.2 x 16.5 " / 419 mm shells or 6.2 torpedoes Stability (Unstable if below 1.00): 1.16 Metacentric height 6.6 ft / 2.0 m Roll period: 16.3 seconds Steadiness - As gun platform (Average = 50 %): 52 % - Recoil effect (Restricted arc if above 1.00): 0.70 Seaboat quality (Average = 1.00): 1.04 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.554 Length to Beam Ratio: 9.00 : 1 'Natural speed' for length: 30.00 kts Power going to wave formation at top speed: 55 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 3.00 degrees Stern overhang: 0.00 ft / 0.00 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 33.00 ft / 10.06 m - Forecastle (20 %): 28.00 ft / 8.53 m - Mid (74 %): 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: 26.32 ft / 8.02 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 117.5 % - Above water (accommodation/working, high = better): 215.4 % Waterplane Area: 63,056 Square feet or 5,858 Square metres Displacement factor (Displacement / loading): 104 % Structure weight / hull surface area: 203 lbs/sq ft or 993 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.98 - Longitudinal: 1.21 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Tuesday, May 30, 2006
The Ger/CB/1915 lives up to expectations
I am sure that the intent for the Ger/CB/1915, when I designed it, in the early 1970's, was to achieve a high speed. The main armament is grouped forward and the armoured citadel is short. The one deviation is that I am sure that the originally envisioned displacement was much lower than 40,455 tons standard. The armament is 6-16.5in BLR and 12-6in QF guns. The armour basis is 9in with a 3in deck and torpedo bulkhead. The speed is a nice 36 knots. This is the Springsharp report:
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