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Wednesday, May 02, 2007

A 17in-gunned version of the Ger/CB/1937 family

I had not originally specified the gun caliber for the next larger sized Ger/CB/1937 design. I decided that for the size, the gun caliber should be no larger than 17in. The armour basis really exceeds battlecruiser protection at 15in. The protection is really robust, if you examine the Springsharp report. From my perspective, this is a very good ship. This is the Springsharp report:
Ger/CB/1937  17in guns, Germany Battlecruiser laid down 1937

Displacement:
 58,409 t light; 61,830 t standard; 65,759 t normal; 68,902 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (889.80 ft / 880.00 ft) x 121.00 ft x (33.00 / 34.34 ft)
 (271.21 m / 268.22 m) x 36.88 m  x (10.06 / 10.47 m)

Armament:
      9 - 17.00" / 432 mm 50.0 cal guns - 2,600.00lbs / 1,179.34kg shells, 150 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 55.0 cal guns - 116.57lbs / 52.88kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts , 1937 Model
   6 x Single mounts on sides, forward deck aft
      12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Anti-air guns in deck mount , 1937 Model
   1 x Single mount on sides amidships
      48 - 1.46" / 37.0 mm 60.0 cal guns - 1.69lbs / 0.77kg shells, 150 per gun
   Anti-air guns in deck mounts , 1937 Model
   24 x Twin mounts on sides, evenly spread
  16 raised mounts
 Weight of broadside 25,267 lbs / 25,267 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 15.0" / 381 mm 575.00 ft / 175.26 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 12.0" / 305 mm 575.00 ft / 175.26 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  6.00" / 152 mm 575.00 ft / 175.26 m 33.00 ft / 10.06 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 15.0" / 381 mm 11.0" / 279 mm  15.0" / 381 mm
 2nd: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 15.00" / 381 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 200,801 shp / 149,797 Kw = 30.00 kts
 Range 10,000nm at 15.00 kts
 Bunker at max displacement = 7,072 tons

Complement:
 2,052 - 2,669

Cost:
 £29.641 million / $118.565 million

Distribution of weights at normal displacement:
 Armament: 4,702 tons, 7.2 %
 Armour: 24,384 tons, 37.1 %
    - Belts: 5,369 tons, 8.2 %
    - Torpedo bulkhead: 4,212 tons, 6.4 %
    - Armament: 5,180 tons, 7.9 %
    - Armour Deck: 9,096 tons, 13.8 %
    - Conning Tower: 526 tons, 0.8 %
 Machinery: 5,565 tons, 8.5 %
 Hull, fittings & equipment: 25,352 tons, 38.6 %
 Fuel, ammunition & stores: 7,350 tons, 11.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   108,642 lbs / 49,279 Kg = 44.2 x 17.0 " / 432 mm shells or 21.3 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 9.2 ft / 2.8 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.26

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.655 / 0.659
 Length to Beam Ratio: 7.27 : 1
 'Natural speed' for length: 29.66 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 11.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  35.00 ft / 10.67 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  26.00 ft / 7.92 m
    - Aft deck: 30.00 %,  26.00 ft / 7.92 m,  27.00 ft / 8.23 m
    - Quarter deck: 20.00 %,  27.00 ft / 8.23 m,  28.00 ft / 8.53 m
    - Average freeboard:  27.98 ft / 8.53 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 77.5 %
  - Above water (accommodation/working, high = better): 205.4 %
 Waterplane Area: 81,944 Square feet or 7,613 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 227 lbs/sq ft or 1,108 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.27
  - 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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