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Tuesday, May 06, 2008

GB/CB/1914: my first Springsharp 3.0 3rd Beta design

I finally downloaded the third Springsharp 3.0 3rd Beta version. I decided to try the large, fast battlecruiser with 12in armour: the GB/CB/1914. This is a design that is more archaic looking than the Hood, but a stronger and more heavily armed ship:
GB/CB/1914, Great Britain Battlecruiser laid down 1914 (Engine 1921)

Displacement:
 40,459 t light; 42,785 t standard; 45,940 t normal; 48,465 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (821.00 ft / 814.00 ft) x 108.00 ft x (31.00 / 32.39 ft)
 (250.24 m / 248.11 m) x 32.92 m  x (9.45 / 9.87 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,920.01lbs / 870.90kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1914 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, forward deck aft
      14 - 6.00" / 152 mm 45.0 cal guns - 108.93lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1914 Model
   14 x Single mounts on sides, evenly spread
  14 hull mounts in casemates- Limited use in heavy seas
      Weight of broadside 20,725 lbs / 9,401 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 570.00 ft / 173.74 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 570.00 ft / 173.74 m 8.00 ft / 2.44 m
   Main Belt covers 108 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 570.00 ft / 173.74 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 86.00 ft / 26.21 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 160,033 shp / 119,385 Kw = 30.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 5,680 tons

Complement:
 1,568 - 2,039

Cost:
 £4.688 million / $18.752 million

Distribution of weights at normal displacement:
 Armament: 2,794 tons, 6.1 %
    - Guns: 2,794 tons, 6.1 %
 Armour: 14,133 tons, 30.8 %
    - Belts: 4,307 tons, 9.4 %
    - Torpedo bulkhead: 1,308 tons, 2.8 %
    - Armament: 4,380 tons, 9.5 %
    - Armour Deck: 3,557 tons, 7.7 %
    - Conning Towers: 580 tons, 1.3 %
 Machinery: 5,511 tons, 12.0 %
 Hull, fittings & equipment: 18,021 tons, 39.2 %
 Fuel, ammunition & stores: 5,481 tons, 11.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   74,422 lbs / 33,757 Kg = 44.1 x 15.0 " / 381 mm shells or 11.0 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.84
 Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.590 / 0.596
 Length to Beam Ratio: 7.54 : 1
 'Natural speed' for length: 28.53 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  31.00 ft / 9.45 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  28.00 ft / 8.53 m
    - Aft deck: 14.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Quarter deck: 31.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  26.12 ft / 7.96 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 88.0 %
  - Above water (accommodation/working, high = better): 219.3 %
 Waterplane Area: 63,699 Square feet or 5,918 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 212 lbs/sq ft or 1,036 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.37
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

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