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Wednesday, January 05, 2005

The GB/DD/1906 destroyer design

Cliff's destroyer design, which he intended to mass-produce, works pretty well in Springsharp, except for being a bad seaboat. I'm not sure what to do, without some pretty drastic action. The "Performance" tab characterizes the design as "Design well balanced for a light fast combatant". This is the report:
GB/DD/1906, Great Britain Destroyer laid down 1906 (Engine 1908)

Displacement:
	774 t light; 795 t standard; 868 t normal; 927 t full load

Dimensions: Length overall / water x beam x draught
	266.66 ft / 265.00 ft x 27.00 ft x 9.00 ft (normal load)
	81.28 m / 80.77 m x 8.23 m  x 2.74 m

Armament:
      2 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1906 Model
	  Quick firing guns in deck mounts 
	  on centreline ends, evenly spread, all raised mounts
	Weight of broadside 42 lbs / 19 kg
	Shells per gun, main battery: 150
	2 - 21.0" / 533.4 mm above water torpedoes

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 2 shafts, 27,577 shp / 20,572 Kw = 32.00 kts
	Range 1,250nm at 15.00 kts
	Bunker at max displacement = 132 tons
	  Caution: Delicate, lightweight machinery

Complement:
	79 - 103

Cost:
	£0.105 million / $0.420 million

Distribution of weights at normal displacement:
	Armament: 5 tons, 0.6 %
	Machinery: 525 tons, 60.5 %
	Hull, fittings & equipment: 244 tons, 28.1 %
	Fuel, ammunition & stores: 94 tons, 10.9 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  208 lbs / 94 Kg = 10.0 x 3.5 " / 88 mm shells or 0.2 torpedoes
	Stability (Unstable if below 1.00): 1.53
	Metacentric height 1.4 ft / 0.4 m
	Roll period: 9.4 seconds
	Steadiness	- As gun platform (Average = 50 %): 45 %
			- Recoil effect (Restricted arc if above 1.00): 0.07
	Seaboat quality  (Average = 1.00): 0.82

Hull form characteristics:
	Hull has a flush deck
	Block coefficient: 0.472
	Length to Beam Ratio: 9.81 : 1
	'Natural speed' for length: 16.28 kts
	Power going to wave formation at top speed: 73 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 1.00 ft / 0.30 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		19.00 ft / 5.79 m
	   - Forecastle (20 %):	18.00 ft / 5.49 m
	   - Mid (30 %):		12.00 ft / 3.66 m
	   - Quarterdeck (15 %):	12.00 ft / 3.66 m
	   - Stern:		12.00 ft / 3.66 m
	   - Average freeboard:	13.58 ft / 4.14 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 199.6 %
		- Above water (accommodation/working, high = better): 112.8 %
	Waterplane Area: 4,650 Square feet or 432 Square metres
	Displacement factor (Displacement / loading): 31 %
	Structure weight / hull surface area: 24 lbs/sq ft or 116 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.44
		- Longitudinal: 2.93
		- Overall: 0.53
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is adequate
	Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

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