Ger/BB/1915, Germany Battleship laid down 1915 (Engine 1941)
Displacement:
56,211 t light; 59,010 t standard; 61,470 t normal; 63,437 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(758.84 ft / 750.00 ft) x 130.00 ft x (34.00 / 34.92 ft)
(231.30 m / 228.60 m) x 39.62 m x (10.36 / 10.64 m)
Armament:
9 - 18.00" / 457 mm 45.0 cal guns - 3,200.00lbs / 1,451.50kg shells, 90 per gun
Breech loading guns in turret on barbette mounts, 1915 Model
3 x Triple mounts on centreline ends, majority forward
1 raised mount - superfiring
24 - 5.00" / 127 mm 50.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
Quick firing guns in turret on barbette mounts, 1915 Model
12 x Twin mounts on sides, forward deck aft
Weight of broadside 30,360 lbs / 13,771 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 18.0" / 457 mm 400.00 ft / 121.92 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 82 % of normal length
- Torpedo Bulkhead:
8.00" / 203 mm 400.00 ft / 121.92 m 34.00 ft / 10.36 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 12.0" / 305 mm 18.0" / 457 mm
2nd: 5.00" / 127 mm 3.00" / 76 mm 5.00" / 127 mm
- Armoured deck - multiple decks: 6.00" / 152 mm For and Aft decks
Forecastle: 6.00" / 152 mm Quarter deck: 6.00" / 152 mm
- Conning towers: Forward 18.00" / 457 mm, Aft 0.00" / 0 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 119,142 shp / 88,880 Kw = 26.00 kts
Range 6,500nm at 15.00 kts
Bunker at max displacement = 4,427 tons
Complement:
1,951 - 2,537
Cost:
£7.334 million / $29.337 million
Distribution of weights at normal displacement:
Armament: 4,501 tons, 7.3 %
Armour: 25,361 tons, 41.3 %
- Belts: 5,760 tons, 9.4 %
- Torpedo bulkhead: 4,026 tons, 6.5 %
- Armament: 6,622 tons, 10.8 %
- Armour Deck: 8,350 tons, 13.6 %
- Conning Tower: 604 tons, 1.0 %
Machinery: 3,149 tons, 5.1 %
Hull, fittings & equipment: 23,200 tons, 37.7 %
Fuel, ammunition & stores: 5,259 tons, 8.6 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
115,696 lbs / 52,479 Kg = 39.7 x 18.0 " / 457 mm shells or 27.5 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 10.8 ft / 3.3 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 68 %
- Recoil effect (Restricted arc if above 1.00): 0.59
Seaboat quality (Average = 1.00): 1.35
Hull form characteristics:
Hull has a flush deck,
an extended bulbous bow and a cruiser stern
Block coefficient (normal/deep): 0.649 / 0.652
Length to Beam Ratio: 5.77 : 1
'Natural speed' for length: 27.39 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 33.00 ft / 10.06 m, 29.00 ft / 8.84 m
- Forward deck: 30.00 %, 29.00 ft / 8.84 m, 25.00 ft / 7.62 m
- Aft deck: 35.00 %, 25.00 ft / 7.62 m, 25.00 ft / 7.62 m
- Quarter deck: 15.00 %, 25.00 ft / 7.62 m, 25.00 ft / 7.62 m
- Average freeboard: 26.72 ft / 8.14 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.1 %
- Above water (accommodation/working, high = better): 188.9 %
Waterplane Area: 74,622 Square feet or 6,933 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 249 lbs/sq ft or 1,214 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.77
- 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
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.
Wednesday, November 07, 2007
The Ger/BB/1915 design
The Ger/BB/1915 design is one where I greatly underestimated the speed that was possible with the specified power. This is a 750ft long ship of about 60,000 tons. The armament is 9-18 and 24-5in guns. The power was specified as 120,000 SHP, but the 26 knots is what Springsharp says is the top speed for that power. I had thought it would only make 20 knots. This is a much better ship than I had thought possible:
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