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Monday, August 13, 2007

A Hood-like Super Lion

If we were building Super Lion battlecruiser, then our emergency war program for 1915 should include such a ship, albeit one that is Hood-like. I wanted 10-15in/42, 16-5.5in QF, an 8 inch belt, and 33 knots of speed. This is such a ship:
GB/CB/1915 Super Lion, Great Britain Battlecruiser laid down 1915 (Engine 1919)

Displacement:
 42,088 t light; 44,118 t standard; 47,086 t normal; 49,460 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (860.06 ft / 855.00 ft) x 105.00 ft x (29.00 / 30.23 ft)
 (262.15 m / 260.60 m) x 32.00 m  x (8.84 / 9.21 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,950.00lbs / 884.51kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1915 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, aft deck forward
      16 - 5.50" / 140 mm 50.0 cal guns - 85.00lbs / 38.56kg shells, 150 per gun
   Quick firing guns in deck and hoist mount, 1915 Model
   1 x Single mount on sides amidships
  4 raised mounts
      Weight of broadside 20,860 lbs / 9,462 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 535.00 ft / 163.07 m 9.00 ft / 2.74 m
 Ends: 4.00" / 102 mm 320.00 ft / 97.54 m 12.00 ft / 3.66 m
 Upper: 5.00" / 127 mm 535.00 ft / 163.07 m 9.00 ft / 2.74 m
   Main Belt covers 96 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 535.00 ft / 163.07 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 7.00" / 178 mm  10.0" / 254 mm
 2nd: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm

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

   - Conning towers: Forward 10.00" / 254 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 235,775 shp / 175,888 Kw = 33.00 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 5,341 tons

Complement:
 1,597 - 2,077

Cost:
 £6.135 million / $24.539 million

Distribution of weights at normal displacement:
 Armament: 2,953 tons, 6.3 %
 Armour: 11,629 tons, 24.7 %
    - Belts: 3,234 tons, 6.9 %
    - Torpedo bulkhead: 1,148 tons, 2.4 %
    - Armament: 3,181 tons, 6.8 %
    - Armour Deck: 3,785 tons, 8.0 %
    - Conning Tower: 281 tons, 0.6 %
 Machinery: 8,373 tons, 17.8 %
 Hull, fittings & equipment: 19,133 tons, 40.6 %
 Fuel, ammunition & stores: 4,998 tons, 10.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   61,615 lbs / 27,948 Kg = 36.5 x 15.0 " / 381 mm shells or 7.5 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 7.0 ft / 2.1 m
 Roll period: 16.6 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.89
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.633 / 0.638
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 kts
 Power going to wave formation at top speed: 55 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  36.00 ft / 10.97 m,  30.00 ft / 9.14 m
    - Forward deck: 42.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Aft deck: 13.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Quarter deck: 15.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Average freeboard:  28.48 ft / 8.68 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 109.2 %
  - Above water (accommodation/working, high = better): 227.0 %
 Waterplane Area: 67,705 Square feet or 6,290 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 210 lbs/sq ft or 1,026 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.24
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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