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Saturday, September 22, 2007

Another try at the Red Book version of the Super Lion

I have this inboard profile of the Super Lion, as I drew it in the early 1970's in the Jane's Fighting Ship style, with different armour thicknesses in different textures. The specification was grossly over-optimistic:
Super Lion

Displacement = 27,000 tons Standard       10-15in/45 (97 ton)
               28,500 tons normal load    16-5in/50 (5 ton)
               31,500 tons deep load

Speed = 32 knots normal     Cost = £2.43 million 
        35.6 knots max

There are no dimensions in the specification, although the inboard profile is to scale at 1 inch = 100 feet. A much larger ship with the lightest machinery is necessary to implement the specification, such as it is.
GB/CB/1912 Super Lion (Red Book), Great Britain Battlecruiser laid down 1912 (Engine 1950)

Displacement:
 37,947 t light; 40,531 t standard; 43,660 t normal; 46,163 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (799.00 ft / 794.00 ft) x 108.00 ft x (27.50 / 28.84 ft)
 (243.54 m / 242.01 m) x 32.92 m  x (8.38 / 8.79 m)

Armament:
      10 - 15.00" / 381 mm 45.0 cal guns - 1,950.00lbs / 884.51kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1912 Model
   5 x Twin mounts on centreline ends, majority forward
  4 raised mounts - superfiring
      16 - 5.00" / 127 mm 50.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1912 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 20,540 lbs / 9,317 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 500.00 ft / 152.40 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 200.00 ft / 60.96 m 16.00 ft / 4.88 m
   94.00 ft / 28.65 m Unarmoured ends
   Main Belt covers 97 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 500.00 ft / 152.40 m 27.50 ft / 8.38 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 5.00" / 127 mm  9.00" / 229 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 9.00" / 229 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 210,216 shp / 156,821 Kw = 32.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 5,632 tons

Complement:
 1,509 - 1,963

Cost:
 £3.675 million / $14.699 million

Distribution of weights at normal displacement:
 Armament: 3,029 tons, 6.9 %
 Armour: 11,084 tons, 25.4 %
    - Belts: 2,900 tons, 6.6 %
    - Torpedo bulkhead: 1,018 tons, 2.3 %
    - Armament: 3,262 tons, 7.5 %
    - Armour Deck: 3,665 tons, 8.4 %
    - Conning Tower: 240 tons, 0.6 %
 Machinery: 5,029 tons, 11.5 %
 Hull, fittings & equipment: 18,805 tons, 43.1 %
 Fuel, ammunition & stores: 5,714 tons, 13.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   71,802 lbs / 32,569 Kg = 42.5 x 15.0 " / 381 mm shells or 10.0 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 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.92
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.648 / 0.653
 Length to Beam Ratio: 7.35 : 1
 'Natural speed' for length: 28.18 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 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: 35.00 %,  33.00 ft / 10.06 m,  31.00 ft / 9.45 m
    - Forward deck: 40.00 %,  31.00 ft / 9.45 m,  31.00 ft / 9.45 m
    - Aft deck: 10.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Average freeboard:  29.28 ft / 8.92 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 90.3 %
  - Above water (accommodation/working, high = better): 243.3 %
 Waterplane Area: 65,571 Square feet or 6,092 Square metres
 Displacement factor (Displacement / loading): 119 %
 Structure weight / hull surface area: 217 lbs/sq ft or 1,062 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.47
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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