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Friday, February 04, 2005

Yet another run at the Ger/DD/1905 design

So, by going to higher power output machinery, I can make my F-class like design for a German destroyer for 1905 work. The ship was intended to make 32 knots and have 2-4in QF and 2-18in TT. That should be a pretty conservative design, only marginally edgy on speed.
Ger/DD/1905, Germany Destroyer laid down 1905 (Engine 1933)

Displacement:
	711 t light; 736 t standard; 797 t normal; 846 t full load

Dimensions: Length overall / water x beam x draught
	270.33 ft / 270.00 ft x 28.00 ft x 10.00 ft (normal load)
	82.40 m / 82.30 m x 8.53 m  x 3.05 m

Armament:
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
	  Quick firing guns in deck mounts with hoists
	  on centreline ends, evenly spread, all raised mounts
	Weight of broadside 64 lbs / 29 kg
	Shells per gun, main battery: 250
	2 - 18.0" / 457.2 mm above water torpedoes

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 2 shafts, 23,972 shp / 17,883 Kw = 32.00 kts
	Range 3,600nm at 12.00 kts
	Bunker at max displacement = 110 tons

Complement:
	74 - 97

Cost:
	£0.090 million / $0.361 million

Distribution of weights at normal displacement:
	Armament: 8 tons, 1.0 %
	Machinery: 420 tons, 52.7 %
	Hull, fittings & equipment: 283 tons, 35.5 %
	Fuel, ammunition & stores: 86 tons, 10.8 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  233 lbs / 106 Kg = 7.3 x 4.0 " / 102 mm shells or 0.2 torpedoes
	Stability (Unstable if below 1.00): 1.24
	Metacentric height 1.1 ft / 0.3 m
	Roll period: 11.2 seconds
	Steadiness	- As gun platform (Average = 50 %): 63 %
			- Recoil effect (Restricted arc if above 1.00): 0.25
	Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.369
	Length to Beam Ratio: 9.64 : 1
	'Natural speed' for length: 16.43 kts
	Power going to wave formation at top speed: 70 %
	Trim (Max stability = 0, Max steadiness = 100): 62
	Bow angle (Positive = bow angles forward): 1.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		19.00 ft / 5.79 m
	   - Forecastle (31 %):	18.00 ft / 5.49 m
	   - Mid (31 %):		18.00 ft / 5.49 m (11.00 ft / 3.35 m aft of break)
	   - Quarterdeck (15 %):	11.00 ft / 3.35 m
	   - Stern:		11.00 ft / 3.35 m
	   - Average freeboard:	13.29 ft / 4.05 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 178.2 %
		- Above water (accommodation/working, high = better): 112.7 %
	Waterplane Area: 4,594 Square feet or 427 Square metres
	Displacement factor (Displacement / loading): 55 %
	Structure weight / hull surface area: 29 lbs/sq ft or 140 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.49
		- Longitudinal: 3.28
		- Overall: 0.59
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is adequate

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