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Saturday, March 03, 2007

The GB/CA/1941 is a super ship that works well in Springsharp

I have this pencil drawing, dated from the 1980's of the GB/CB/1941, which has considerable specifications, as well as the pencil drawing. I implemented the ship in Springsharp 3.0b Beta, and the ship works very well. The cruiser is armed with 9-9.2in/50 guns and has a top speed of 35 knots. I will post the drawing quite soon, as it is memorable. The armour basis is 5in. This is the Springsharp report:
GB/CA/1941, Great Britain Armoured Cruiser laid down 1941

Displacement:
 18,490 t light; 19,179 t standard; 20,198 t normal; 21,012 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (723.93 ft / 720.00 ft) x 80.00 ft x (23.00 / 23.72 ft)
 (220.65 m / 219.46 m) x 24.38 m  x (7.01 / 7.23 m)

Armament:
      9 - 9.20" / 234 mm 50.0 cal guns - 412.17lbs / 186.96kg 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
   Aft Main mounts separated by engine room
      12 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts , 1941 Model
   6 x Twin mounts on sides, evenly spread
  6 raised mounts
      24 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 250 per gun
   Anti-air guns in deck mounts , 1941 Model
   2 x 2 row sextuple mounts on sides, evenly spread
  2 raised mounts
   2 x 2 row sextuple mounts on centreline, aft deck aft
  1 raised mount - superfiring
 Weight of broadside 4,141 lbs / 4,141 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 460.00 ft / 140.21 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 5.00" / 127 mm 460.00 ft / 140.21 m 8.00 ft / 2.44 m
   Main Belt covers 98 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  5.00" / 127 mm
 2nd: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm
 3rd: 1.00" / 25 mm 1.00" / 25 mm        -

   - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 178,891 shp / 133,453 Kw = 35.00 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 1,833 tons

Complement:
 846 - 1,101

Cost:
 £10.726 million / $42.906 million

Distribution of weights at normal displacement:
 Armament: 1,016 tons, 5.0 %
 Armour: 4,625 tons, 22.9 %
    - Belts: 1,553 tons, 7.7 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 779 tons, 3.9 %
    - Armour Deck: 2,197 tons, 10.9 %
    - Conning Tower: 96 tons, 0.5 %
 Machinery: 4,728 tons, 23.4 %
 Hull, fittings & equipment: 8,630 tons, 42.7 %
 Fuel, ammunition & stores: 1,708 tons, 8.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   28,034 lbs / 12,716 Kg = 72.0 x 9.2 " / 234 mm shells or 2.4 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 4.5 ft / 1.4 m
 Roll period: 15.9 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.51
 Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.534 / 0.538
 Length to Beam Ratio: 9.00 : 1
 'Natural speed' for length: 26.83 kts
 Power going to wave formation at top speed: 58 %
 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 %,  32.00 ft / 9.75 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  27.00 ft / 8.23 m
    - Aft deck: 35.00 %,  27.00 ft / 8.23 m,  25.00 ft / 7.62 m
    - Quarter deck: 15.00 %,  25.00 ft / 7.62 m,  23.00 ft / 7.01 m
    - Average freeboard:  27.14 ft / 8.27 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 95.4 %
  - Above water (accommodation/working, high = better): 240.0 %
 Waterplane Area: 39,587 Square feet or 3,678 Square metres
 Displacement factor (Displacement / loading): 111 %
 Structure weight / hull surface area: 140 lbs/sq ft or 683 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.58
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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