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Friday, January 07, 2005

The "Super Lion"

I just took another try at the "Super Lion" battlecruiser described in The World Crisis, Vol.1. This is rather speculative, but I think it captures Admiral Fisher's intent. The size is much greater than he would have liked (36,420 tons normal). Nonetheless, I am pleased with the result.
GB/CB/Super Lion, Great Britain Battlecruiser laid down 1912

Displacement:
	34,788 t light; 36,420 t standard; 36,420 t normal; 36,420 t full load

Dimensions: Length overall / water x beam x draught
	795.00 ft / 795.00 ft x 95.00 ft x 29.00 ft (normal load)
	242.32 m / 242.32 m x 28.96 m  x 8.84 m

Armament:
      10 - 15.00" / 381 mm guns (5x2 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline, evenly spread, all raised mounts
	  Main guns limited to end-on fire
      16 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1912 Model
	  Quick firing guns in casemate mounts 
	  on side ends, evenly spread, all raised mounts - superfiring
	Weight of broadside 17,875 lbs / 8,108 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	9.00" / 229 mm	  0.00 ft / 0.00 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 0 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	9.00" / 229 mm	6.00" / 152 mm		9.00" / 229 mm
	2nd:	3.00" / 76 mm	3.00" / 76 mm		2.00" / 51 mm

   - Armour deck: 3.00" / 76 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 177,449 shp / 132,377 Kw = 32.00 kts
	Range 6,500nm at 0.00 kts
	Bunker at max displacement = 0 tons

Complement:
	1,317 - 1,713

Cost:
	£4.085 million / $16.340 million

Distribution of weights at normal displacement:
	Armament: 2,234 tons, 6.1 %
	Armour: 7,420 tons, 20.4 %
	   - Belts: 506 tons, 1.4 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 3,899 tons, 10.7 %
	   - Armour Deck: 3,014 tons, 8.3 %
	   - Conning Tower: 0 tons, 0.0 %
	Machinery: 7,075 tons, 19.4 %
	Hull, fittings & equipment: 18,059 tons, 49.6 %
	Fuel, ammunition & stores: 1,632 tons, 4.5 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  27,212 lbs / 12,343 Kg = 16.1 x 15.0 " / 381 mm shells or 1.9 torpedoes
	Stability (Unstable if below 1.00): 0.94
	Metacentric height 4.0 ft / 1.2 m
	Roll period: 19.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 54 %
			- Recoil effect (Restricted arc if above 1.00): 1.68
	Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.582
	Length to Beam Ratio: 8.37 : 1
	'Natural speed' for length: 28.20 kts
	Power going to wave formation at top speed: 54 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -1.00 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 (18 %):	30.00 ft / 9.14 m
	   - Mid (85 %):		30.00 ft / 9.14 m (20.00 ft / 6.10 m aft of break)
	   - Quarterdeck (18 %):	20.00 ft / 6.10 m
	   - Stern:		20.00 ft / 6.10 m
	   - Average freeboard:	28.57 ft / 8.71 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 108.5 %
		- Above water (accommodation/working, high = better): 238.7 %
	Waterplane Area: 54,315 Square feet or 5,046 Square metres
	Displacement factor (Displacement / loading): 92 %
	Structure weight / hull surface area: 221 lbs/sq ft or 1,080 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.41
		- Overall: 1.00
	Caution: Poor stability - excessive risk of capsizing
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent

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