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
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
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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