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Sunday, January 30, 2005

The "Super Lion" design

This is my latest attempt at the "Super Lion" design mentioned in Winston Churchill's The World Crisis, Volume I. Admiral Fisher liked the concept: 10-15 guns and a speed of 30 knots. It was his perfect capital ship for 1912. Of course, it wasn't built, as it was too "edgy", at a time when the decision makers were conservatives if not reactionaries.
Super Lion, Great Britain Battlecruiser laid down 1912

Displacement:
	35,421 t light; 37,173 t standard; 41,040 t normal; 44,133 t full load

Dimensions: Length overall / water x beam x draught
	750.00 ft / 750.00 ft x 95.00 ft x 32.00 ft (normal load)
	228.60 m / 228.60 m x 28.96 m  x 9.75 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 ends, majority forward, all raised mounts - superfiring
      14 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
	  Quick firing guns in casemate mounts 
	  on side, evenly spread
	  14 guns in hull casemates - Limited use in heavy seas
	Weight of broadside 18,387 lbs / 8,340 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	9.00" / 229 mm	560.00 ft / 170.69 m	17.00 ft / 5.18 m
	Ends:	4.00" / 102 mm	190.00 ft / 57.91 m	17.00 ft / 5.18 m
	  Main Belt covers 115 % of normal length

   - Torpedo Bulkhead:
		1.50" / 38 mm	560.00 ft / 170.69 m	28.00 ft / 8.53 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	9.00" / 229 mm	6.00" / 152 mm		9.00" / 229 mm
	2nd:	4.00" / 102 mm	      -			      -

   - Armour deck: 3.00" / 76 mm, Conning tower: 7.00" / 178 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 154,565 shp / 115,305 Kw = 30.00 kts
	Range 8,500nm at 15.00 kts
	Bunker at max displacement = 6,960 tons

Complement:
	1,441 - 1,874

Cost:
	£4.033 million / $16.133 million

Distribution of weights at normal displacement:
	Armament: 2,298 tons, 5.6 %
	Armour: 11,390 tons, 27.8 %
	   - Belts: 4,056 tons, 9.9 %
	   - Torpedo bulkhead: 870 tons, 2.1 %
	   - Armament: 3,310 tons, 8.1 %
	   - Armour Deck: 2,974 tons, 7.2 %
	   - Conning Tower: 179 tons, 0.4 %
	Machinery: 6,163 tons, 15.0 %
	Hull, fittings & equipment: 15,569 tons, 37.9 %
	Fuel, ammunition & stores: 5,619 tons, 13.7 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  39,456 lbs / 17,897 Kg = 23.4 x 15.0 " / 381 mm shells or 5.0 torpedoes
	Stability (Unstable if below 1.00): 1.01
	Metacentric height 4.7 ft / 1.4 m
	Roll period: 18.4 seconds
	Steadiness	- As gun platform (Average = 50 %): 53 %
			- Recoil effect (Restricted arc if above 1.00): 0.98
	Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.630
	Length to Beam Ratio: 7.89 : 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): -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 (67 %):	29.00 ft / 8.84 m
	   - Mid (67 %):		29.00 ft / 8.84 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:	26.57 ft / 8.10 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 114.8 %
		- Above water (accommodation/working, high = better): 141.7 %
	Waterplane Area: 53,585 Square feet or 4,978 Square metres
	Displacement factor (Displacement / loading): 97 %
	Structure weight / hull surface area: 195 lbs/sq ft or 951 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.31
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent

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