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Wednesday, July 26, 2006

The Ger/CB/1909 design

The Ger/CB/1909 design is pretty amazing to me, as it is very close to the original concept and weights. The ship is rather odd, in that the armament is 6-12in guns in triple turrets and 8-6.7in BLR guns in twin turrets. The armour basis is 5in, although turrets and barbettes are 8in. The ship is laid down in 1909 and has 1909 machinery. The power generated is more than I had originally allowed for the weight, so the ship can reach 32.5 knots. This is the Springsharp report:
Ger/CB/1909, Germany Battlecruiser laid down 1909

Displacement:
 26,249 t light; 27,187 t standard; 30,500 t normal; 33,150 t full load

Dimensions: Length overall / water x beam x draught
 730.00 ft / 730.00 ft x 90.00 ft x 27.00 ft (normal load)
 222.50 m / 222.50 m x 27.43 m  x 8.23 m

Armament:
      6 - 12.00" / 305 mm guns (2x3 guns), 864.00lbs / 391.90kg shells, 1909 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      8 - 6.69" / 170 mm guns (4x2 guns), 149.90lbs / 68.00kg shells, 1909 Model
   Breech loading guns in turrets (on barbettes)
   on side, evenly spread
 Weight of broadside 6,383 lbs / 2,895 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 475.00 ft / 144.78 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 475.00 ft / 144.78 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  8.00" / 203 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 177,795 shp / 132,635 Kw = 32.50 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 5,964 tons

Complement:
 1,153 - 1,500

Cost:
 £2.720 million / $10.881 million

Distribution of weights at normal displacement:
 Armament: 798 tons, 2.6 %
 Armour: 5,905 tons, 19.4 %
    - Belts: 1,621 tons, 5.3 %
    - Torpedo bulkhead: 949 tons, 3.1 %
    - Armament: 1,386 tons, 4.5 %
    - Armour Deck: 1,781 tons, 5.8 %
    - Conning Tower: 168 tons, 0.6 %
 Machinery: 8,082 tons, 26.5 %
 Hull, fittings & equipment: 11,464 tons, 37.6 %
 Fuel, ammunition & stores: 4,251 tons, 13.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   33,538 lbs / 15,213 Kg = 38.8 x 12.0 " / 305 mm shells or 3.9 torpedoes
 Stability (Unstable if below 1.00): 1.32
 Metacentric height 7.0 ft / 2.1 m
 Roll period: 14.3 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.35
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.602
 Length to Beam Ratio: 8.11 : 1
 'Natural speed' for length: 27.02 kts
 Power going to wave formation at top speed: 58 %
 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 (62 %):  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: 25.28 ft / 7.71 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 135.8 %
  - Above water (accommodation/working, high = better): 200.1 %
 Waterplane Area: 48,132 Square feet or 4,472 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 162 lbs/sq ft or 793 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.02
  - Longitudinal: 1.37
  - Overall: 1.05
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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