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Sunday, March 11, 2007

The GB/CB/1941 design

I tried the GB/CB/1941 design, dating from work I did in the 1980's and the ship worked extremely well in Springsharp 3.0b1 Beta. This is a photograph of my original drawing:

The ship is a 35 knot battlecruiser with 9-16in/50 and 20-4.5in DP guns. The belt is 11in. This is the Springsharp report:
GB/CB/1941, Great Britain Battlecruiser laid down 1941

Displacement:
 58,733 t light; 61,433 t standard; 66,120 t normal; 69,870 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (1,007.92 ft / 1,000.00 ft) x 120.00 ft x (35.00 / 36.50 ft)
 (307.21 m / 304.80 m) x 36.58 m  x (10.67 / 11.13 m)

Armament:
      9 - 16.00" / 406 mm 50.0 cal guns - 2,168.09lbs / 983.43kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts , 1941 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      20 - 4.50" / 114 mm 45.0 cal guns - 45.95lbs / 20.84kg shells, 150 per gun
   Dual purpose guns in turret on barbette mounts , 1941 Model
   6 x Twin mounts on sides, forward evenly spread
  6 raised mounts
   4 x Twin mounts on sides, aft evenly spread
  4 raised mounts
 Weight of broadside 20,432 lbs / 20,432 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.0" / 279 mm 575.00 ft / 175.26 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 88 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 575.00 ft / 175.26 m 35.00 ft / 10.67 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 15.0" / 381 mm 10.0" / 254 mm  12.0" / 305 mm
 2nd: 3.00" / 76 mm 2.00" / 51 mm  3.00" / 76 mm

   - Armour deck: 5.00" / 127 mm, Conning tower: 10.00" / 254 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 289,659 shp / 216,086 Kw = 35.00 kts
 Range 13,000nm at 15.00 kts
 Bunker at max displacement = 8,437 tons

Complement:
 2,061 - 2,680

Cost:
 £32.369 million / $129.477 million

Distribution of weights at normal displacement:
 Armament: 3,744 tons, 5.7 %
 Armour: 20,347 tons, 30.8 %
    - Belts: 4,393 tons, 6.6 %
    - Torpedo bulkhead: 2,979 tons, 4.5 %
    - Armament: 4,551 tons, 6.9 %
    - Armour Deck: 8,073 tons, 12.2 %
    - Conning Tower: 352 tons, 0.5 %
 Machinery: 7,655 tons, 11.6 %
 Hull, fittings & equipment: 28,220 tons, 42.7 %
 Fuel, ammunition & stores: 7,387 tons, 11.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   117,863 lbs / 53,462 Kg = 57.6 x 16.0 " / 406 mm shells or 19.4 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 8.1 ft / 2.5 m
 Roll period: 17.7 seconds
 Steadiness - As gun platform (Average = 50 %): 71 %
   - Recoil effect (Restricted arc if above 1.00): 0.71
 Seaboat quality  (Average = 1.00): 1.43

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and small transom stern
 Block coefficient (normal/deep): 0.551 / 0.558
 Length to Beam Ratio: 8.33 : 1
 'Natural speed' for length: 36.40 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 22.00 %,  50.00 ft / 15.24 m,  35.00 ft / 10.67 m
    - Forward deck: 30.00 %,  35.00 ft / 10.67 m,  33.00 ft / 10.06 m
    - Aft deck: 33.00 %,  33.00 ft / 10.06 m,  33.00 ft / 10.06 m
    - Quarter deck: 15.00 %,  33.00 ft / 10.06 m,  33.00 ft / 10.06 m
    - Average freeboard:  35.06 ft / 10.69 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 80.6 %
  - Above water (accommodation/working, high = better): 270.0 %
 Waterplane Area: 87,272 Square feet or 8,108 Square metres
 Displacement factor (Displacement / loading): 119 %
 Structure weight / hull surface area: 223 lbs/sq ft or 1,091 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.47
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

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