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Sunday, January 23, 2005

The big, fast 6in-gun light cruiser: US/CL/1936

The next step is to have a big, fast 6in gun light cruiser to fit in with the rest of the extreme ships. This design is the US/CL/1936a1, as I hope to do another light cruiser which is AA-oriented. This ship has 15-6in QF guns and 12-5in DP guns, along with 36-40mm AA. The speed is extreme: 36 knots and the range pretty extreme for what I have been doing: 12,000 nm. The armor basis is 4in, and I included 12-21in TT, as well, as this is tryining to be a US Mogami (except larger).
US/CL/1936, United States Light Cruiser laid down 1936

Displacement:
	16,262 t light; 17,011 t standard; 19,149 t normal; 20,860 t full load

Dimensions: Length overall / water x beam x draught
	673.15 ft / 672.00 ft x 70.00 ft x 26.00 ft (normal load)
	205.18 m / 204.83 m x 21.34 m  x 7.92 m

Armament:
      15 - 6.00" / 152 mm guns (5x3 guns), 108.00lbs / 48.99kg shells, 1936 Model
	  Quick firing guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1936 Model
	  Dual purpose guns in turrets (on barbettes)
	  on side ends, evenly spread, all raised mounts - superfiring
      36 - 1.57" / 40.0 mm guns (9x4 guns), 1.95lbs / 0.89kg shells, 1936 Model
	  Anti-aircraft guns in deck mounts 
	  on side ends, majority forward, all raised mounts - superfiring
	Weight of broadside 2,440 lbs / 1,107 kg
	Shells per gun, main battery: 250
	12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	4.00" / 102 mm	450.00 ft / 137.16 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 103 % of normal length

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	5.00" / 127 mm	3.00" / 76 mm		4.00" / 102 mm
	2nd:	2.00" / 51 mm	2.00" / 51 mm		2.00" / 51 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 4.00" / 102 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 177,218 shp / 132,204 Kw = 35.00 kts
	Range 12,000nm at 15.00 kts
	Bunker at max displacement = 3,849 tons

Complement:
	813 - 1,058

Cost:
	£8.023 million / $32.091 million

Distribution of weights at normal displacement:
	Armament: 305 tons, 1.6 %
	Armour: 3,960 tons, 20.7 %
	   - Belts: 1,200 tons, 6.3 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 880 tons, 4.6 %
	   - Armour Deck: 1,819 tons, 9.5 %
	   - Conning Tower: 62 tons, 0.3 %
	Machinery: 4,972 tons, 26.0 %
	Hull, fittings & equipment: 7,024 tons, 36.7 %
	Fuel, ammunition & stores: 2,888 tons, 15.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  22,812 lbs / 10,347 Kg = 211.2 x 6.0 " / 152 mm shells or 2.0 torpedoes
	Stability (Unstable if below 1.00): 1.10
	Metacentric height 3.5 ft / 1.1 m
	Roll period: 15.7 seconds
	Steadiness	- As gun platform (Average = 50 %): 55 %
			- Recoil effect (Restricted arc if above 1.00): 0.51
	Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
	Hull has a flush deck
	Block coefficient: 0.548
	Length to Beam Ratio: 9.60 : 1
	'Natural speed' for length: 25.92 kts
	Power going to wave formation at top speed: 60 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		33.00 ft / 10.06 m
	   - Forecastle (20 %):	25.00 ft / 7.62 m
	   - Mid (50 %):		25.00 ft / 7.62 m
	   - Quarterdeck (15 %):	25.00 ft / 7.62 m
	   - Stern:		25.00 ft / 7.62 m
	   - Average freeboard:	25.64 ft / 7.82 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 97.9 %
		- Above water (accommodation/working, high = better): 158.2 %
	Waterplane Area: 32,767 Square feet or 3,044 Square metres
	Displacement factor (Displacement / loading): 117 %
	Structure weight / hull surface area: 125 lbs/sq ft or 609 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.70
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent

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