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Saturday, February 05, 2005

Another try at my Ger/DL/1914 design

The design of the Ger/DL/1914 was inspired by the German ships, some built for Russia, that had three stacks and 4-4.1in guns, with 6-TT. By taking care of the SHP/ton issue, the design works well. A drawback of the basic concept is that it is low-volume, above and below the waterline.
Ger/DL/1914, Germany Destroyer Leader laid down 1914 (Engine 1933)

Displacement:
	1,214 t light; 1,262 t standard; 1,404 t normal; 1,518 t full load

Dimensions: Length overall / water x beam x draught
	322.73 ft / 320.00 ft x 32.00 ft x 12.00 ft (normal load)
	98.37 m / 97.54 m x 9.75 m  x 3.66 m

Armament:
      4 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1914 Model
	  Quick firing guns in deck mounts with hoists
	  on centreline ends, evenly spread, all raised mounts - superfiring
	Weight of broadside 141 lbs / 64 kg
	Shells per gun, main battery: 250
	6 - 23.6" / 600.0001 mm above water torpedoes

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 2 shafts, 31,614 shp / 23,584 Kw = 32.00 kts
	Range 3,600nm at 15.00 kts
	Bunker at max displacement = 256 tons

Complement:
	114 - 149

Cost:
	£0.201 million / $0.804 million

Distribution of weights at normal displacement:
	Armament: 18 tons, 1.3 %
	Machinery: 719 tons, 51.2 %
	Hull, fittings & equipment: 478 tons, 34.0 %
	Fuel, ammunition & stores: 190 tons, 13.5 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  463 lbs / 210 Kg = 13.1 x 4.1 " / 105 mm shells or 0.3 torpedoes
	Stability (Unstable if below 1.00): 1.34
	Metacentric height 1.5 ft / 0.5 m
	Roll period: 10.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 52 %
			- Recoil effect (Restricted arc if above 1.00): 0.31
	Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
	Hull has raised forecastle, rise forward of midbreak
	Block coefficient: 0.400
	Length to Beam Ratio: 10.00 : 1
	'Natural speed' for length: 17.89 kts
	Power going to wave formation at top speed: 67 %
	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:		21.00 ft / 6.40 m
	   - Forecastle (20 %):	20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
	   - Mid (35 %):		19.00 ft / 5.79 m (12.00 ft / 3.66 m aft of break)
	   - Quarterdeck (15 %):	12.00 ft / 3.66 m
	   - Stern:		12.00 ft / 3.66 m
	   - Average freeboard:	14.21 ft / 4.33 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 175.5 %
		- Above water (accommodation/working, high = better): 66.0 %
	Waterplane Area: 6,303 Square feet or 586 Square metres
	Displacement factor (Displacement / loading): 71 %
	Structure weight / hull surface area: 37 lbs/sq ft or 180 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.57
		- Longitudinal: 2.52
		- Overall: 0.66
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is cramped

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