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Saturday, April 21, 2007

The Ger/CB/1937 15in guns version

The 15in-gunned version of the Ger/CB/1937 has a quick-and-dirty photo to go with the design:

This is in the family of designs contructed around the Ger/CB/1937 drawing and specifications, dating from February 1999. My opinion of the design is that the dimensions are too small, for what I am trying to do with the design, especially since I am trying for a higher speed than the original 28 knots. This is probably a much better ship than anything that the British or Germans were able to complete during World War II. I must admit that they would have added light AA guns and additional equipment:
Ger/CB/1937 a1 15in guns, Germany Battlecruiser laid down 1937 (Engine 1941)

Displacement:
 40,547 t light; 42,408 t standard; 45,377 t normal; 47,751 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (791.30 ft / 785.00 ft) x 107.00 ft x (29.00 / 30.29 ft)
 (241.19 m / 239.27 m) x 32.61 m  x (8.84 / 9.23 m)

Armament:
      9 - 15.00" / 381 mm 50.0 cal guns - 1,790.00lbs / 811.93kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1937 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      12 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts , 1937 Model
   6 x Twin mounts on sides, forward deck aft
      12 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts , 1937 Model
   6 x Twin mounts on sides, forward deck aft
  6 raised mounts
 Weight of broadside 17,889 lbs / 17,889 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 515.00 ft / 156.97 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 515.00 ft / 156.97 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 515.00 ft / 156.97 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  12.0" / 305 mm
 2nd: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm
 3rd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 166,426 shp / 124,154 Kw = 30.00 kts
 Range 8,500nm at 16.00 kts
 Bunker at max displacement = 5,343 tons

Complement:
 1,553 - 2,020

Cost:
 £21.208 million / $84.831 million

Distribution of weights at normal displacement:
 Armament: 3,412 tons, 7.5 %
 Armour: 15,831 tons, 34.9 %
    - Belts: 3,733 tons, 8.2 %
    - Torpedo bulkhead: 1,105 tons, 2.4 %
    - Armament: 3,508 tons, 7.7 %
    - Armour Deck: 7,155 tons, 15.8 %
    - Conning Tower: 329 tons, 0.7 %
 Machinery: 4,398 tons, 9.7 %
 Hull, fittings & equipment: 18,112 tons, 39.9 %
 Fuel, ammunition & stores: 4,829 tons, 10.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   72,906 lbs / 33,069 Kg = 43.2 x 15.0 " / 381 mm shells or 10.9 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 7.3 ft / 2.2 m
 Roll period: 16.6 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.66
 Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.652 / 0.657
 Length to Beam Ratio: 7.34 : 1
 'Natural speed' for length: 28.02 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 7.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  35.00 ft / 10.67 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  28.00 ft / 8.53 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:  26.61 ft / 8.11 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 84.1 %
  - Above water (accommodation/working, high = better): 203.1 %
 Waterplane Area: 64,463 Square feet or 5,989 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 203 lbs/sq ft or 992 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.36
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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