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Sunday, April 29, 2007

An alternative design for a 16in-gunned Ger/BB/1935

There are many alternatives in the Ger/BB/1935 family of designs. One is for a narrower 16-in gunned ship. Otherwise, the ship is similar to the other, but has a somewhat longer belt that offers better coverage. This family of designs is more complete, since I have included the light AA guns. This is the Springsharp report:
Ger/CB/1935  16in guns-Alternative, Germany Battlecruiser laid down 1935

Displacement:
 43,829 t light; 46,597 t standard; 49,467 t normal; 51,763 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (829.41 ft / 820.00 ft) x 115.00 ft x (30.00 / 31.15 ft)
 (252.81 m / 249.94 m) x 35.05 m  x (9.14 / 9.50 m)

Armament:
      9 - 16.00" / 406 mm 50.0 cal guns - 2,170.00lbs / 984.30kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts , 1935 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      12 - 6.00" / 152 mm 55.0 cal guns - 115.00lbs / 52.16kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1935 Model
   12 x Single mounts on sides, evenly spread
      12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Anti-air guns in deck mount , 1935 Model
   1 x Single mount on sides amidships
      32 - 1.46" / 37.0 mm 60.0 cal guns - 1.69lbs / 0.77kg shells, 150 per gun
   Anti-air guns in deck mounts , 1935 Model
   8 x Single mounts on sides, evenly spread
  7 raised mounts
 Weight of broadside 21,351 lbs / 21,351 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 11.0" / 279 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 540.00 ft / 164.59 m 30.00 ft / 9.14 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 10.0" / 254 mm  14.0" / 356 mm
 2nd: 4.00" / 102 mm 1.00" / 25 mm  4.00" / 102 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 14.00" / 356 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 149,341 shp / 111,409 Kw = 29.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 5,166 tons

Complement:
 1,658 - 2,156

Cost:
 £22.063 million / $88.252 million

Distribution of weights at normal displacement:
 Armament: 4,060 tons, 8.2 %
 Armour: 16,433 tons, 33.2 %
    - Belts: 4,661 tons, 9.4 %
    - Torpedo bulkhead: 2,398 tons, 4.8 %
    - Armament: 3,806 tons, 7.7 %
    - Armour Deck: 5,161 tons, 10.4 %
    - Conning Tower: 406 tons, 0.8 %
 Machinery: 4,243 tons, 8.6 %
 Hull, fittings & equipment: 20,527 tons, 41.5 %
 Fuel, ammunition & stores: 5,638 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   77,822 lbs / 35,300 Kg = 38.0 x 16.0 " / 406 mm shells or 13.6 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 8.6 ft / 2.6 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.612 / 0.617
 Length to Beam Ratio: 7.13 : 1
 'Natural speed' for length: 28.64 kts
 Power going to wave formation at top speed: 50 %
 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 %,  33.00 ft / 10.06 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  24.00 ft / 7.32 m
    - Aft deck: 30.00 %,  24.00 ft / 7.32 m,  25.00 ft / 7.62 m
    - Quarter deck: 20.00 %,  25.00 ft / 7.62 m,  26.00 ft / 7.92 m
    - Average freeboard:  25.98 ft / 7.92 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 84.1 %
  - Above water (accommodation/working, high = better): 200.3 %
 Waterplane Area: 69,746 Square feet or 6,480 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 217 lbs/sq ft or 1,060 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.30
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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