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Thursday, January 13, 2005

The bloated, reduced capability "Super Fast Battlecruiser"

In order to get acceptable seakeeping ability, I had to greatly lengthen the "Super Fast Battlecruiser", give it greater beam, and reduce speed to 37 knots (still quite fast, but not like I wanted). I also increased the freeboard, and slightly lengthed the forecastle.
GB/CB/SuperFast A2, Great Britain Battlecruiser laid down 1921

Displacement:
	37,159 t light; 38,389 t standard; 39,712 t normal; 40,770 t full load

Dimensions: Length overall / water x beam x draught
	930.65 ft / 930.00 ft x 112.00 ft x 32.00 ft (normal load)
	283.66 m / 283.46 m x 34.14 m  x 9.75 m

Armament:
      4 - 17.00" / 432 mm guns in single mounts, 2,456.50lbs / 1,114.25kg shells, 1921 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1921 Model
	  Quick firing guns in deck mounts 
	  on side ends, evenly spread, all raised mounts - superfiring
	Weight of broadside 10,338 lbs / 4,689 kg
	Shells per gun, main battery: 75

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	4.00" / 102 mm	425.00 ft / 129.54 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 70 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		1.00" / 25 mm	425.00 ft / 129.54 m	27.00 ft / 8.23 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	8.00" / 203 mm	5.00" / 127 mm		8.00" / 203 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 1.50" / 38 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 6 shafts, 324,033 shp / 241,728 Kw = 38.00 kts
	Range 3,600nm at 15.00 kts
	Bunker at max displacement = 2,381 tons

Complement:
	1,406 - 1,828

Cost:
	£10.050 million / $40.200 million

Distribution of weights at normal displacement:
	Armament: 1,292 tons, 3.3 %
	Armour: 5,342 tons, 13.5 %
	   - Belts: 1,229 tons, 3.1 %
	   - Torpedo bulkhead: 425 tons, 1.1 %
	   - Armament: 1,890 tons, 4.8 %
	   - Armour Deck: 1,798 tons, 4.5 %
	   - Conning Tower: 0 tons, 0.0 %
	Machinery: 11,158 tons, 28.1 %
	Hull, fittings & equipment: 19,367 tons, 48.8 %
	Fuel, ammunition & stores: 2,553 tons, 6.4 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  38,780 lbs / 17,590 Kg = 15.8 x 17.0 " / 432 mm shells or 4.2 torpedoes
	Stability (Unstable if below 1.00): 1.15
	Metacentric height 7.7 ft / 2.4 m
	Roll period: 16.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 62 %
			- Recoil effect (Restricted arc if above 1.00): 0.49
	Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.417
	Length to Beam Ratio: 8.30 : 1
	'Natural speed' for length: 30.50 kts
	Power going to wave formation at top speed: 53 %
	Trim (Max stability = 0, Max steadiness = 100): 55
	Bow angle (Positive = bow angles forward): 1.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		37.00 ft / 11.28 m
	   - Forecastle (20 %):	35.00 ft / 10.67 m
	   - Mid (47 %):		35.00 ft / 10.67 m (27.00 ft / 8.23 m aft of break)
	   - Quarterdeck (15 %):	27.00 ft / 8.23 m
	   - Stern:		0.00 ft / 0.00 m
	   - Average freeboard:	28.90 ft / 8.81 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 140.2 %
		- Above water (accommodation/working, high = better): 266.2 %
	Waterplane Area: 64,803 Square feet or 6,020 Square metres
	Displacement factor (Displacement / loading): 105 %
	Structure weight / hull surface area: 204 lbs/sq ft or 996 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.97
		- Longitudinal: 1.32
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent

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