Amazon Ad

Sunday, January 23, 2005

Now, the extremely large American battlecruiser: US/CB/1936

The counterpart to the very large battleship is the very large (if not extremely large) battlecruiser. For whatever reason (perhaps a faulty calculation), the ship can reach 36 knots. I really did not have to do much to make this ship "work". One feature is that it is not so well protected against torpedoes. This is the Springsharp report for the US/CB/1936:
US/CB/1936, United States Enter ship type laid down 1936

Displacement:
	116,905 t light; 121,965 t standard; 131,180 t normal; 138,551 t full load

Dimensions: Length overall / water x beam x draught
	1,353.57 ft / 1,350.00 ft x 150.00 ft x 41.00 ft (normal load)
	412.57 m / 411.48 m x 45.72 m  x 12.50 m

Armament:
      9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1936 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      12 - 6.00" / 152 mm guns (6x2 guns), 108.00lbs / 48.99kg shells, 1936 Model
	  Quick firing guns in turrets (on barbettes)
	  on side, evenly spread, all raised mounts
      12 - 4.00" / 102 mm guns (6x2 guns), 32.00lbs / 14.51kg shells, 1936 Model
	  Anti-aircraft guns in deck mounts with hoists
	  on side, evenly spread, all raised mounts
      56 - 1.57" / 40.0 mm guns (14x4 guns), 1.95lbs / 0.89kg shells, 1936 Model
	  Anti-aircraft guns in deck mounts 
	  on side ends, evenly spread, all raised mounts - superfiring
	Weight of broadside 43,464 lbs / 19,715 kg
	Shells per gun, main battery: 100

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	15.0" / 381 mm	730.00 ft / 222.50 m	20.00 ft / 6.10 m
	Ends:	Unarmoured
	  Main Belt covers 83 % of normal length

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	17.0" / 432 mm	10.0" / 254 mm		15.0" / 381 mm
	2nd:	4.00" / 102 mm	3.00" / 76 mm		4.00" / 102 mm
	3rd:	1.00" / 25 mm	      -			      -

   - Armour deck: 7.00" / 178 mm, Conning tower: 12.00" / 305 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 8 shafts, 510,151 shp / 380,572 Kw = 36.00 kts
	Range 15,000nm at 15.00 kts
	Bunker at max displacement = 16,587 tons

Complement:
	3,446 - 4,480

Cost:
	£56.204 million / $224.815 million

Distribution of weights at normal displacement:
	Armament: 5,433 tons, 4.1 %
	Armour: 37,627 tons, 28.7 %
	   - Belts: 9,527 tons, 7.3 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 9,079 tons, 6.9 %
	   - Armour Deck: 18,353 tons, 14.0 %
	   - Conning Tower: 667 tons, 0.5 %
	Machinery: 14,314 tons, 10.9 %
	Hull, fittings & equipment: 59,532 tons, 45.4 %
	Fuel, ammunition & stores: 14,274 tons, 10.9 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  217,022 lbs / 98,439 Kg = 46.9 x 21.0 " / 533 mm shells or 9.1 torpedoes
	Stability (Unstable if below 1.00): 1.08
	Metacentric height 10.6 ft / 3.2 m
	Roll period: 19.3 seconds
	Steadiness	- As gun platform (Average = 50 %): 75 %
			- Recoil effect (Restricted arc if above 1.00): 0.85
	Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
	Hull has a flush deck
	Block coefficient: 0.553
	Length to Beam Ratio: 9.00 : 1
	'Natural speed' for length: 36.74 kts
	Power going to wave formation at top speed: 44 %
	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:		45.00 ft / 13.72 m
	   - Forecastle (20 %):	37.00 ft / 11.28 m
	   - Mid (50 %):		37.00 ft / 11.28 m
	   - Quarterdeck (15 %):	37.00 ft / 11.28 m
	   - Stern:		38.00 ft / 11.58 m
	   - Average freeboard:	37.72 ft / 11.50 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 67.1 %
		- Above water (accommodation/working, high = better): 289.8 %
	Waterplane Area: 141,721 Square feet or 13,166 Square metres
	Displacement factor (Displacement / loading): 120 %
	Structure weight / hull surface area: 297 lbs/sq ft or 1,448 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.99
		- Longitudinal: 1.06
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is excellent
	Room for accommodation and workspaces is excellent
	Ship has slow, easy roll, a good, steady gun platform
	Good seaboat, rides out heavy weather easily

No comments:

Amazon Context Links