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
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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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