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Wednesday, July 20, 2005

Another "Super Lion" design

I have a design for a rather Small Super Lion design that attempts to implement Admiral Fisher's concept on a 750ft ship. The problem with this version is that the displacement increased dramatically to 37,500 tons. It still is a 30-knot ship with 10=15in guns. In this case, the armor basis is 8in, although is simply because that is what I chose, as the drawing is non-specific. I guess that my protection is heavier than 6,000 tons is the reason for the size increase. To do 6,000 tons would imply at most a 6in belt. This is the Springsharp report:
Super Lion, Great Britain Battlecruiser laid down 1912

Displacement:
 33,476 t light; 35,007 t standard; 37,500 t normal; 39,494 t full load

Dimensions: Length overall / water x beam x draught
 752.00 ft / 750.00 ft x 100.00 ft x 28.90 ft (normal load)
 229.21 m / 228.60 m x 30.48 m  x 8.81 m

Armament:
      8 - 15.00" / 381 mm guns (4x2 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      2 - 15.00" / 381 mm guns (1x2 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
   Breech loading guns in a turret (on a barbette)
   on centreline amidships
      12 - 4.00" / 102 mm guns (6x2 guns), 32.00lbs / 14.51kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side, all forward, 2 raised mounts - superfiring
 Weight of broadside 17,259 lbs / 7,829 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 540.00 ft / 164.59 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 5.00" / 127 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m
   Main Belt covers 111 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 580.00 ft / 176.78 m 27.00 ft / 8.23 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: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

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

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 146,626 shp / 109,383 Kw = 30.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 4,487 tons

Complement:
 1,346 - 1,751

Cost:
 £3.802 million / $15.209 million

Distribution of weights at normal displacement:
 Armament: 2,157 tons, 5.8 %
 Armour: 9,199 tons, 24.5 %
    - Belts: 2,550 tons, 6.8 %
    - Torpedo bulkhead: 1,159 tons, 3.1 %
    - Armament: 2,237 tons, 6.0 %
    - Armour Deck: 3,060 tons, 8.2 %
    - Conning Tower: 193 tons, 0.5 %
 Machinery: 5,846 tons, 15.6 %
 Hull, fittings & equipment: 16,273 tons, 43.4 %
 Fuel, ammunition & stores: 4,024 tons, 10.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   44,417 lbs / 20,147 Kg = 26.3 x 15.0 " / 381 mm shells or 5.7 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 6.2 ft / 1.9 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.88
 Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.606
 Length to Beam Ratio: 7.50 : 1
 'Natural speed' for length: 27.39 kts
 Power going to wave formation at top speed: 54 %
 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 (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (67 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 25.60 ft / 7.80 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 116.6 %
  - Above water (accommodation/working, high = better): 201.2 %
 Waterplane Area: 55,138 Square feet or 5,122 Square metres
 Displacement factor (Displacement / loading): 98 %
 Structure weight / hull surface area: 207 lbs/sq ft or 1,012 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.45
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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