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Saturday, January 08, 2005

My 1909 German scout design

My Ger/CS/1909 design was really a large destroyer, along the lines of what the Italians were doing. The ship had a good freeboard, three stacks, and 4-5in guns with 2-21in TT. I was able to make it work in Springsharp by reducing the speed to 31 knots and bloating the displacement considerably above 2400 tons. The ship was unarmored. It is only an good seaboat, when I reduced the speed (and machinery weight), which is somewhat disappointing.
Ger/CS/1909, Germany Scout laid down 1909 (Engine 1910)

Displacement:
	1,934 t light; 2,014 t standard; 2,261 t normal; 2,458 t full load

Dimensions: Length overall / water x beam x draught
	350.00 ft / 350.00 ft x 37.00 ft x 13.00 ft (normal load)
	106.68 m / 106.68 m x 11.28 m  x 3.96 m

Armament:
      4 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1909 Model
	  Quick firing guns in deck mounts 
	  on centreline, evenly spread, all raised mounts
	  Aft Main mounts separated by engine room
	Weight of broadside 250 lbs / 113 kg
	Shells per gun, main battery: 250
	2 - 21.0" / 533.4 mm above water torpedoes

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 2 shafts, 37,468 shp / 27,951 Kw = 31.00 kts
	Range 2,750nm at 15.00 kts
	Bunker at max displacement = 443 tons

Complement:
	163 - 213

Cost:
	£0.269 million / $1.075 million

Distribution of weights at normal displacement:
	Armament: 31 tons, 1.4 %
	Machinery: 1,249 tons, 55.2 %
	Hull, fittings & equipment: 654 tons, 28.9 %
	Fuel, ammunition & stores: 326 tons, 14.4 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  712 lbs / 323 Kg = 11.4 x 5.0 " / 127 mm shells or 0.3 torpedoes
	Stability (Unstable if below 1.00): 1.65
	Metacentric height 2.6 ft / 0.8 m
	Roll period: 9.6 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.13
	Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.470
	Length to Beam Ratio: 9.46 : 1
	'Natural speed' for length: 18.71 kts
	Power going to wave formation at top speed: 67 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -1.00 degrees
	Stern overhang: -2.00 ft / -0.61 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		22.00 ft / 6.71 m
	   - Forecastle (21 %):	21.00 ft / 6.40 m
	   - Mid (34 %):		20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
	   - Quarterdeck (12 %):	12.00 ft / 3.66 m
	   - Stern:		12.00 ft / 3.66 m
	   - Average freeboard:	15.08 ft / 4.60 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 189.5 %
		- Above water (accommodation/working, high = better): 119.7 %
	Waterplane Area: 8,401 Square feet or 780 Square metres
	Displacement factor (Displacement / loading): 68 %
	Structure weight / hull surface area: 42 lbs/sq ft or 204 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.64
		- Longitudinal: 1.92
		- Overall: 0.72
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is adequate

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