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Sunday, January 23, 2005

Super-destroyer leader: US/DL/1936

To go with the rest, I have my super-destroyer leader. I couldn't resist having an odd gun, the 5.5in DP, of which I included 8, along with 16-40mm AA and 10-21in TT. The speed is the hoped-for 36 knots, but only a 3,500 nm range.
US/DL/1936, United States Destroyer Leader laid down 1936

Displacement:
	5,847 t light; 6,071 t standard; 6,414 t normal; 6,689 t full load

Dimensions: Length overall / water x beam x draught
	518.08 ft / 498.00 ft x 49.00 ft x 20.00 ft (normal load)
	157.91 m / 151.79 m x 14.94 m  x 6.10 m

Armament:
      8 - 5.50" / 140 mm guns (4x2 guns), 83.19lbs / 37.73kg shells, 1936 Model
	  Dual purpose guns in deck mounts with hoists
	  on centreline ends, evenly spread, all raised mounts - superfiring
      16 - 1.57" / 40.0 mm guns (4x4 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 697 lbs / 316 kg
	Shells per gun, main battery: 240
	10 - 21.0" / 533.4 mm above water torpedoes

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 2 shafts, 110,620 shp / 82,523 Kw = 36.00 kts
	Range 3,500nm at 15.00 kts
	Bunker at max displacement = 618 tons

Complement:
	357 - 465

Cost:
	£3.756 million / $15.024 million

Distribution of weights at normal displacement:
	Armament: 87 tons, 1.4 %
	Machinery: 3,104 tons, 48.4 %
	Hull, fittings & equipment: 2,656 tons, 41.4 %
	Fuel, ammunition & stores: 567 tons, 8.8 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  3,061 lbs / 1,389 Kg = 36.8 x 5.5 " / 140 mm shells or 0.6 torpedoes
	Stability (Unstable if below 1.00): 1.32
	Metacentric height 2.8 ft / 0.9 m
	Roll period: 12.3 seconds
	Steadiness	- As gun platform (Average = 50 %): 50 %
			- Recoil effect (Restricted arc if above 1.00): 0.37
	Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
	Hull has a flush deck
	Block coefficient: 0.460
	Length to Beam Ratio: 10.16 : 1
	'Natural speed' for length: 22.32 kts
	Power going to wave formation at top speed: 65 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 19.00 ft / 5.79 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		31.00 ft / 9.45 m
	   - Forecastle (20 %):	19.00 ft / 5.79 m
	   - Mid (50 %):		19.00 ft / 5.79 m
	   - Quarterdeck (15 %):	19.00 ft / 5.79 m
	   - Stern:		19.00 ft / 5.79 m
	   - Average freeboard:	19.96 ft / 6.08 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 167.4 %
		- Above water (accommodation/working, high = better): 114.2 %
	Waterplane Area: 15,695 Square feet or 1,458 Square metres
	Displacement factor (Displacement / loading): 93 %
	Structure weight / hull surface area: 87 lbs/sq ft or 426 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.90
		- Longitudinal: 2.61
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is adequate

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