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Wednesday, April 04, 2007

A Super Lion battlecruiser design with Springsharp 3.0b1 Beta

I tried a Super Lion design with Springsharp 3.0b1 Beta, and was pleased with the result. A purist might complain that I am going too large for the date, but I think that a 30-knot ship with 10-15in guns needs to be large. I went with Admiral Fisher's "limited armour", as well. For those not familiar with the Super Lion, Winston Churchill discusses Admiral Fisher's concept in Vol.I of The World Crisis. This is my favorite photograph of a Super Lion:

This is the Springsharp report:
GB/CB/1912 Super Lion, Great Britain Battlecruiser laid down 1912

Displacement:
 33,912 t light; 35,772 t standard; 39,169 t normal; 41,886 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (792.00 ft / 785.00 ft) x 97.00 ft x (28.00 / 29.64 ft)
 (241.40 m / 239.27 m) x 29.57 m  x (8.53 / 9.03 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,920.00lbs / 870.90kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1912 Model
   4 x Twin mounts on centreline ends, majority forward
  2 raised mounts - superfiring
   1 x Twin mount on centreline, aft deck forward
      14 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in casemate mounts , 1912 Model
   14 x Single mounts on sides, evenly spread
  14 hull mounts in casemates- Limited use in heavy seas
 Weight of broadside 20,600 lbs / 20,600 kg
 4 - 21.0" / 533 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 490.00 ft / 149.35 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 6.00" / 152 mm 490.00 ft / 149.35 m 8.00 ft / 2.44 m
   Main Belt covers 96 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 490.00 ft / 149.35 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  8.00" / 203 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 149,032 shp / 111,178 Kw = 30.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 6,114 tons

Complement:
 1,391 - 1,809

Cost:
 £3.515 million / $14.059 million

Distribution of weights at normal displacement:
 Armament: 2,794 tons, 7.1 %
 Armour: 9,743 tons, 24.9 %
    - Belts: 2,363 tons, 6.0 %
    - Torpedo bulkhead: 1,015 tons, 2.6 %
    - Armament: 2,949 tons, 7.5 %
    - Armour Deck: 3,217 tons, 8.2 %
    - Conning Tower: 199 tons, 0.5 %
 Machinery: 5,942 tons, 15.2 %
 Hull, fittings & equipment: 16,446 tons, 42.0 %
 Fuel, ammunition & stores: 5,257 tons, 13.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   54,691 lbs / 24,808 Kg = 32.4 x 15.0 " / 381 mm shells or 6.8 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.99
 Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.643 / 0.650
 Length to Beam Ratio: 8.09 : 1
 'Natural speed' for length: 28.02 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 44
 Bow angle (Positive = bow angles forward): -2.00 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 %,  31.00 ft / 9.45 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Aft deck: 17.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Quarter deck: 33.00 %,  19.00 ft / 5.79 m,  20.00 ft / 6.10 m
    - Average freeboard:  24.85 ft / 7.57 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 106.4 %
  - Above water (accommodation/working, high = better): 206.5 %
 Waterplane Area: 57,958 Square feet or 5,384 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 201 lbs/sq ft or 981 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.26
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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