Ger/CB/1906, Germany Battlecruiser laid down 1906 (Engine 1917)
Displacement:
22,547 t light; 23,394 t standard; 25,000 t normal; 26,285 t full load
Dimensions: Length overall / water x beam x draught
801.00 ft / 800.00 ft x 85.00 ft x 27.00 ft (normal load)
244.14 m / 243.84 m x 25.91 m x 8.23 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 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1906 Model
Quick firing guns in casemate mounts
on side, all amidships
Weight of broadside 7,662 lbs / 3,475 kg
Shells per gun, main battery: 80
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.00" / 102 mm 425.00 ft / 129.54 m 17.00 ft / 5.18 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 26.00 ft / 7.92 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: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 149,293 shp / 111,373 Kw = 33.00 kts
Range 5,600nm at 15.00 kts
Bunker at max displacement = 2,891 tons
Complement:
993 - 1,292
Cost:
£2.360 million / $9.439 million
Distribution of weights at normal displacement:
Armament: 958 tons, 3.8 %
Armour: 4,942 tons, 19.8 %
- Belts: 1,250 tons, 5.0 %
- Torpedo bulkhead: 613 tons, 2.5 %
- Armament: 1,327 tons, 5.3 %
- Armour Deck: 1,642 tons, 6.6 %
- Conning Tower: 111 tons, 0.4 %
Machinery: 5,473 tons, 21.9 %
Hull, fittings & equipment: 11,174 tons, 44.7 %
Fuel, ammunition & stores: 2,453 tons, 9.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
31,016 lbs / 14,068 Kg = 35.9 x 12.0 " / 305 mm shells or 3.6 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 5.1 ft / 1.5 m
Roll period: 15.9 seconds
Steadiness - As gun platform (Average = 50 %): 66 %
- Recoil effect (Restricted arc if above 1.00): 0.73
Seaboat quality (Average = 1.00): 1.33
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.477
Length to Beam Ratio: 9.41 : 1
'Natural speed' for length: 28.28 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -2.00 degrees
Stern overhang: 1.00 ft / 0.30 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (20 %): 28.00 ft / 8.53 m
- Mid (67 %): 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: 25.60 ft / 7.80 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 130.2 %
- Above water (accommodation/working, high = better): 219.4 %
Waterplane Area: 44,367 Square feet or 4,122 Square metres
Displacement factor (Displacement / loading): 106 %
Structure weight / hull surface area: 162 lbs/sq ft or 791 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.29
- 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 16, 2005
The September 8, 2001 version of the Ger/CB/1906 design
The oddest thing about the Ger/CB/1906 design is that due to its lightweight machinery, the design works well (except for having a belt that is too short, according to Springsharp). I used the armored citadel length from the 2001 drawing for the calculations. When I entered the design, originally with 1917 machinery, it had too much hull strength, so I changed the machinery date to 1914. I had to change it back, as it turns out that I had forgotten to enter the anti-torpedo bulkhead. After I entered the torpedo bulkhead, I had to reduce the range to 5,600 nm to reach the magic 1.00 composite strength. The dimensions used are 800ft x 85ft x 27ft, with a normal displacement of 25,000 tons. The speed is 33 knots. The armament is 8-12in/45 and 12-4in QF guns. The armor is a legacy of my thinking in 1971, where the belt was only 4in thick, in exchange for a 33 knot speed. This is the Springsharp report:
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