Ger/CB/1937 17in guns, Germany Battlecruiser laid down 1937 Displacement: 58,409 t light; 61,830 t standard; 65,759 t normal; 68,902 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (889.80 ft / 880.00 ft) x 121.00 ft x (33.00 / 34.34 ft) (271.21 m / 268.22 m) x 36.88 m x (10.06 / 10.47 m) Armament: 9 - 17.00" / 432 mm 50.0 cal guns - 2,600.00lbs / 1,179.34kg shells, 150 per gun Breech loading guns in turret on barbette mounts , 1937 Model 3 x Triple mounts on centreline ends, majority forward 1 raised mount - superfiring 12 - 6.00" / 152 mm 55.0 cal guns - 116.57lbs / 52.88kg shells, 150 per gun Quick firing guns in turret on barbette mounts , 1937 Model 6 x Single mounts on sides, forward deck aft 12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun Anti-air guns in deck mount , 1937 Model 1 x Single mount on sides amidships 48 - 1.46" / 37.0 mm 60.0 cal guns - 1.69lbs / 0.77kg shells, 150 per gun Anti-air guns in deck mounts , 1937 Model 24 x Twin mounts on sides, evenly spread 16 raised mounts Weight of broadside 25,267 lbs / 25,267 kg Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 15.0" / 381 mm 575.00 ft / 175.26 m 8.00 ft / 2.44 m Ends: Unarmoured Upper: 12.0" / 305 mm 575.00 ft / 175.26 m 8.00 ft / 2.44 m Main Belt covers 101 % of normal length - Torpedo Bulkhead: 6.00" / 152 mm 575.00 ft / 175.26 m 33.00 ft / 10.06 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 15.0" / 381 mm 11.0" / 279 mm 15.0" / 381 mm 2nd: 5.00" / 127 mm 3.00" / 76 mm 5.00" / 127 mm - Armour deck: 6.00" / 152 mm, Conning tower: 15.00" / 381 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 200,801 shp / 149,797 Kw = 30.00 kts Range 10,000nm at 15.00 kts Bunker at max displacement = 7,072 tons Complement: 2,052 - 2,669 Cost: £29.641 million / $118.565 million Distribution of weights at normal displacement: Armament: 4,702 tons, 7.2 % Armour: 24,384 tons, 37.1 % - Belts: 5,369 tons, 8.2 % - Torpedo bulkhead: 4,212 tons, 6.4 % - Armament: 5,180 tons, 7.9 % - Armour Deck: 9,096 tons, 13.8 % - Conning Tower: 526 tons, 0.8 % Machinery: 5,565 tons, 8.5 % Hull, fittings & equipment: 25,352 tons, 38.6 % Fuel, ammunition & stores: 7,350 tons, 11.2 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 108,642 lbs / 49,279 Kg = 44.2 x 17.0 " / 432 mm shells or 21.3 torpedoes Stability (Unstable if below 1.00): 1.19 Metacentric height 9.2 ft / 2.8 m Roll period: 16.8 seconds Steadiness - As gun platform (Average = 50 %): 63 % - Recoil effect (Restricted arc if above 1.00): 0.61 Seaboat quality (Average = 1.00): 1.26 Hull form characteristics: Hull has a flush deck, a normal bow and a cruiser stern Block coefficient (normal/deep): 0.655 / 0.659 Length to Beam Ratio: 7.27 : 1 'Natural speed' for length: 29.66 kts Power going to wave formation at top speed: 51 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 11.00 degrees Stern overhang: 3.00 ft / 0.91 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 20.00 %, 35.00 ft / 10.67 m, 29.00 ft / 8.84 m - Forward deck: 30.00 %, 29.00 ft / 8.84 m, 26.00 ft / 7.92 m - Aft deck: 30.00 %, 26.00 ft / 7.92 m, 27.00 ft / 8.23 m - Quarter deck: 20.00 %, 27.00 ft / 8.23 m, 28.00 ft / 8.53 m - Average freeboard: 27.98 ft / 8.53 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 77.5 % - Above water (accommodation/working, high = better): 205.4 % Waterplane Area: 81,944 Square feet or 7,613 Square metres Displacement factor (Displacement / loading): 109 % Structure weight / hull surface area: 227 lbs/sq ft or 1,108 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.98 - Longitudinal: 1.27 - 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, May 02, 2007
A 17in-gunned version of the Ger/CB/1937 family
I had not originally specified the gun caliber for the next larger sized Ger/CB/1937 design. I decided that for the size, the gun caliber should be no larger than 17in. The armour basis really exceeds battlecruiser protection at 15in. The protection is really robust, if you examine the Springsharp report. From my perspective, this is a very good ship. This is the Springsharp report:
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