Ger/CB/1906 Coal-fired boilers, Germany Battlecruiser laid down 1906 (Engine 1919) Displacement: 24,890 t light; 25,828 t standard; 28,400 t normal; 30,458 t full load Dimensions: Length overall / water x beam x draught 800.00 ft / 800.00 ft x 85.00 ft x 25.60 ft (normal load) 243.84 m / 243.84 m x 25.91 m x 7.80 m Armament: 8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1906 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, 2 raised mounts - superfiring 12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1906 Model Quick firing guns in deck mounts with hoists on side, evenly spread Weight of broadside 7,296 lbs / 3,309 kg Shells per gun, main battery: 90 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 4.00" / 102 mm 425.00 ft / 129.54 m 16.00 ft / 4.88 m Ends: Unarmoured Main Belt covers 82 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.50" / 38 mm 425.00 ft / 129.54 m 25.00 ft / 7.62 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 6.00" / 152 mm 4.00" / 102 mm 6.00" / 152 mm 2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm Machinery: Coal fired boilers, steam turbines, Direct drive, 4 shafts, 168,506 shp / 125,706 Kw = 33.00 kts Range 6,500nm at 15.00 kts Bunker at max displacement = 4,630 tons (100% coal) Complement: 1,093 - 1,422 Cost: £2.559 million / $10.235 million Distribution of weights at normal displacement: Armament: 912 tons, 3.2 % Armour: 5,914 tons, 20.8 % - Belts: 1,181 tons, 4.2 % - Torpedo bulkhead: 590 tons, 2.1 % - Armament: 1,337 tons, 4.7 % - Armour Deck: 2,686 tons, 9.5 % - Conning Tower: 120 tons, 0.4 % Machinery: 6,582 tons, 23.2 % Hull, fittings & equipment: 11,481 tons, 40.4 % Fuel, ammunition & stores: 3,510 tons, 12.4 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 35,355 lbs / 16,037 Kg = 40.9 x 12.0 " / 305 mm shells or 3.9 torpedoes Stability (Unstable if below 1.00): 1.19 Metacentric height 5.4 ft / 1.6 m Roll period: 15.4 seconds Steadiness - As gun platform (Average = 50 %): 60 % - Recoil effect (Restricted arc if above 1.00): 0.66 Seaboat quality (Average = 1.00): 1.21 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.571 Length to Beam Ratio: 9.41 : 1 'Natural speed' for length: 28.28 kts Power going to wave formation at top speed: 53 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): -2.00 degrees Stern overhang: -2.00 ft / -0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 32.00 ft / 9.75 m - Forecastle (20 %): 28.00 ft / 8.53 m - Mid (69 %): 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: 25.84 ft / 7.88 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 129.9 % - Above water (accommodation/working, high = better): 219.6 % Waterplane Area: 48,401 Square feet or 4,497 Square metres Displacement factor (Displacement / loading): 108 % Structure weight / hull surface area: 157 lbs/sq ft or 769 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.99 - Longitudinal: 1.13 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Friday, September 29, 2006
The Ger/CB/1906 design comes out heavy
The Ger/CB/1906 design is very agressive. The design does a lot to shorten the armoured citadel, and to achieve a very high speed for a large ship laid down in 1906. The side armour is thin, 4in, but the deck is a rather thick 3in. The turret faces and barbettes are 6in. The ship is trying to carry 8-12in guns at 33 knots. The ship is an all-around better ship than its opponent, the GB/CB/1905 design. Optimistically, I had hoped for an overload speed of 36 knots, in 1971. This is the Springsharp report, for the version with coal-fired boilers:
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