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Friday, February 04, 2005

There has been discussion about rebuilding the Tiger in the 1920's

At the NavWarGames Yahoo group, there has been a lot of dicussion about rebuilding the Tiger and upgunning to 8-15in guns in the process. I experimented in Springsharp with a 1927 Tiger-like battlecruiser. I was impressed with what could be done:
GB/CB/1927 Tiger style, Great Britain Enter ship type laid down 1927

Displacement:
	31,191 t light; 32,662 t standard; 35,091 t normal; 37,033 t full load

Dimensions: Length overall / water x beam x draught
	714.00 ft / 714.00 ft x 102.00 ft x 31.00 ft (normal load)
	217.63 m / 217.63 m x 31.09 m  x 9.45 m

Armament:
      8 - 15.00" / 381 mm guns (4x2 guns), 1,687.50lbs / 765.44kg shells, 1927 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1927 Model
	  Quick firing guns in casemate mounts 
	  on side, evenly spread
	  12 guns in hull casemates - Limited use in heavy seas
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1927 Model
	  Anti-aircraft guns in deck mounts with hoists
	  on side ends, evenly spread, all raised mounts - superfiring
	Weight of broadside 15,107 lbs / 6,853 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	8.00" / 203 mm	570.00 ft / 173.74 m	18.00 ft / 5.49 m
	Ends:	5.00" / 127 mm	140.00 ft / 42.67 m	18.00 ft / 5.49 m
	  4.00 ft / 1.22 m Unarmoured ends
	  Main Belt covers 123 % of normal length

   - Torpedo Bulkhead:
		1.50" / 38 mm	570.00 ft / 173.74 m	28.00 ft / 8.53 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	11.0" / 279 mm	7.00" / 178 mm		9.00" / 229 mm
	2nd:	6.00" / 152 mm	3.00" / 76 mm		3.00" / 76 mm

   - Armour deck: 3.50" / 89 mm, Conning tower: 9.00" / 229 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 122,686 shp / 91,524 Kw = 29.00 kts
	Range 8,500nm at 15.00 kts
	Bunker at max displacement = 4,371 tons

Complement:
	1,281 - 1,666

Cost:
	£11.710 million / $46.838 million

Distribution of weights at normal displacement:
	Armament: 1,888 tons, 5.4 %
	Armour: 11,065 tons, 31.5 %
	   - Belts: 3,860 tons, 11.0 %
	   - Torpedo bulkhead: 886 tons, 2.5 %
	   - Armament: 2,839 tons, 8.1 %
	   - Armour Deck: 3,273 tons, 9.3 %
	   - Conning Tower: 208 tons, 0.6 %
	Machinery: 3,873 tons, 11.0 %
	Hull, fittings & equipment: 14,365 tons, 40.9 %
	Fuel, ammunition & stores: 3,900 tons, 11.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  41,829 lbs / 18,973 Kg = 24.8 x 15.0 " / 381 mm shells or 6.6 torpedoes
	Stability (Unstable if below 1.00): 1.04
	Metacentric height 5.6 ft / 1.7 m
	Roll period: 18.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 60 %
			- Recoil effect (Restricted arc if above 1.00): 0.65
	Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.544
	Length to Beam Ratio: 7.00 : 1
	'Natural speed' for length: 26.72 kts
	Power going to wave formation at top speed: 53 %
	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:		32.00 ft / 9.75 m
	   - Forecastle (67 %):	27.00 ft / 8.23 m
	   - Mid (67 %):		27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
	   - Quarterdeck (15 %):	19.00 ft / 5.79 m
	   - Stern:		19.00 ft / 5.79 m
	   - Average freeboard:	25.70 ft / 7.83 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 94.9 %
		- Above water (accommodation/working, high = better): 142.8 %
	Waterplane Area: 50,541 Square feet or 4,695 Square metres
	Displacement factor (Displacement / loading): 103 %
	Structure weight / hull surface area: 196 lbs/sq ft or 955 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.56
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent

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