Ger/BB/1915 CDV, Germany Coast Defense Battleship laid down 1915 Displacement: 25,503 t light; 26,575 t standard; 28,000 t normal; 29,140 t full load Dimensions: Length overall / water x beam x draught 585.00 ft / 585.00 ft x 100.00 ft x 29.10 ft (normal load) 178.31 m / 178.31 m x 30.48 m x 8.87 m Armament: 4 - 18.00" / 457 mm guns (2x2 guns), 2,916.00lbs / 1,322.68kg shells, 1915 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread 20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1915 Model Quick firing guns in turrets (on barbettes) on side, all amidships, 4 raised mounts - superfiring Weight of broadside 12,914 lbs / 5,858 kg Shells per gun, main battery: 70 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 12.0" / 305 mm 400.00 ft / 121.92 m 17.00 ft / 5.18 m Ends: Unarmoured Main Belt covers 105 % of normal length - Torpedo Bulkhead: 3.00" / 76 mm 400.00 ft / 121.92 m 27.00 ft / 8.23 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 13.0" / 330 mm 8.00" / 203 mm 12.0" / 305 mm 2nd: 3.00" / 76 mm 3.00" / 76 mm 3.00" / 76 mm - Armour deck: 4.00" / 102 mm, Conning tower: 12.00" / 305 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 66,211 shp / 49,393 Kw = 25.00 kts Range 4,250nm at 15.00 kts Bunker at max displacement = 2,565 tons Complement: 1,081 - 1,406 Cost: £3.781 million / $15.126 million Distribution of weights at normal displacement: Armament: 1,614 tons, 5.8 % Armour: 10,282 tons, 36.7 % - Belts: 3,555 tons, 12.7 % - Torpedo bulkhead: 1,199 tons, 4.3 % - Armament: 2,194 tons, 7.8 % - Armour Deck: 3,095 tons, 11.1 % - Conning Tower: 238 tons, 0.9 % Machinery: 2,508 tons, 9.0 % Hull, fittings & equipment: 11,099 tons, 39.6 % Fuel, ammunition & stores: 2,497 tons, 8.9 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 40,419 lbs / 18,334 Kg = 13.9 x 18.0 " / 457 mm shells or 7.1 torpedoes Stability (Unstable if below 1.00): 1.15 Metacentric height 6.5 ft / 2.0 m Roll period: 16.5 seconds Steadiness - As gun platform (Average = 50 %): 64 % - Recoil effect (Restricted arc if above 1.00): 0.58 Seaboat quality (Average = 1.00): 1.28 Hull form characteristics: Hull has a flush deck Block coefficient: 0.576 Length to Beam Ratio: 5.85 : 1 'Natural speed' for length: 24.19 kts Power going to wave formation at top speed: 54 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 0.00 degrees Stern overhang: -1.00 ft / -0.30 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 25.00 ft / 7.62 m - Forecastle (20 %): 22.00 ft / 6.71 m - Mid (50 %): 22.00 ft / 6.71 m - Quarterdeck (15 %): 22.00 ft / 6.71 m - Stern: 22.00 ft / 6.71 m - Average freeboard: 22.24 ft / 6.78 m Ship tends to be wet forward Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 89.9 % - Above water (accommodation/working, high = better): 162.1 % Waterplane Area: 41,822 Square feet or 3,885 Square metres Displacement factor (Displacement / loading): 99 % Structure weight / hull surface area: 191 lbs/sq ft or 930 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.92 - Longitudinal: 2.07 - Overall: 1.00 Hull space for machinery, storage, compartmentation is adequate Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Saturday, June 25, 2005
Another look at the Ger/BB/1915 CDV
Back in 1971, we were very aware of the apparent uses of coast defense battleships. I had designed the Ger/BB/1915 CDV to be sort of a modern "pre-dreadnought". The original design was actually to conservative. The Springsharp design is actually more capable, although I suppose that part of the reason is that the protection is somewhat less than the original design weight of 14,970 tons. This is the Springsharp report:
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