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Sunday, April 15, 2007

I tried the 12in version of the Ger/CB/1937 in Springsharp 3.0b1 Beta

I have several families of designs that use the same freehand drawing that I did in early 1999. One is what I am calling, for lack of a better name, the Ger/CB/1937. This is the 12in gunned version of that family. I made a Springsharp 3.0b1 Beta design. This is the drawing:

This is the Springsharp report:
Ger/CB/1937 a1 12in guns, Germany Battlecruiser laid down 1937 (Engine 1941)

Displacement:
 29,049 t light; 30,246 t standard; 31,840 t normal; 33,115 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (721.05 ft / 715.00 ft) x 98.00 ft x (28.00 / 28.90 ft)
 (219.78 m / 217.93 m) x 29.87 m  x (8.53 / 8.81 m)

Armament:
      9 - 12.00" / 305 mm 50.0 cal guns - 915.00lbs / 415.04kg 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 10,014 lbs / 10,014 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.0" / 279 mm 470.00 ft / 143.26 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 470.00 ft / 143.26 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 470.00 ft / 143.26 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 11.0" / 279 mm 7.00" / 178 mm  11.0" / 279 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: 5.00" / 127 mm, Conning tower: 11.00" / 279 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 152,164 shp / 113,514 Kw = 31.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,870 tons

Complement:
 1,191 - 1,549

Cost:
 £14.297 million / $57.190 million

Distribution of weights at normal displacement:
 Armament: 2,073 tons, 6.5 %
 Armour: 11,287 tons, 35.4 %
    - Belts: 3,067 tons, 9.6 %
    - Torpedo bulkhead: 974 tons, 3.1 %
    - Armament: 2,407 tons, 7.6 %
    - Armour Deck: 4,600 tons, 14.4 %
    - Conning Tower: 238 tons, 0.7 %
 Machinery: 4,021 tons, 12.6 %
 Hull, fittings & equipment: 12,501 tons, 39.3 %
 Fuel, ammunition & stores: 2,791 tons, 8.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   49,978 lbs / 22,670 Kg = 57.8 x 12.0 " / 305 mm shells or 7.7 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 6.5 ft / 2.0 m
 Roll period: 16.2 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.48
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.568 / 0.572
 Length to Beam Ratio: 7.30 : 1
 'Natural speed' for length: 26.74 kts
 Power going to wave formation at top speed: 56 %
 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 %,  33.00 ft / 10.06 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  23.00 ft / 7.01 m
    - Aft deck: 35.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Average freeboard:  24.61 ft / 7.50 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 89.0 %
  - Above water (accommodation/working, high = better): 188.4 %
 Waterplane Area: 49,734 Square feet or 4,620 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 176 lbs/sq ft or 861 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.46
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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