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Monday, January 03, 2005

This is what I could make work as a scout cruiser

I was disappointed at what I could make work in Springsharp as a 1905 scout cruiser that was very destroyer-like. I had to drastically reduce the speed in order for the design to be viable. I would be interested to see if at a later date, it would work as intended. Note that this was based on the concept for Churchill's "Super Swift" from 1912, including the 2in side armor:
Ger/CS/1905, Germany scout cruiser laid down 1906 (Engine 1908)

Displacement:
	2,354 t light; 2,430 t standard; 2,679 t normal; 2,879 t full load

Dimensions: Length overall / water x beam x draught
	372.27 ft / 370.00 ft x 38.00 ft x 13.50 ft (normal load)
	113.47 m / 112.78 m x 11.58 m  x 4.11 m

Armament:
      5 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1906 Model
	  Quick firing guns in deck mounts 
	  on centreline ends, majority forward, all raised mounts - superfiring
	Weight of broadside 160 lbs / 73 kg
	Shells per gun, main battery: 250
	2 - 18.0" / 457.2 mm above water torpedoes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	2.00" / 51 mm	165.00 ft / 50.29 m	8.00 ft / 2.44 m
	Ends:	Unarmoured
	  Main Belt covers 69 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 40,816 shp / 30,449 Kw = 31.00 kts
	Range 2,250nm at 15.00 kts
	Bunker at max displacement = 449 tons

Complement:
	186 - 242

Cost:
	£0.328 million / $1.314 million

Distribution of weights at normal displacement:
	Armament: 20 tons, 0.7 %
	Armour: 118 tons, 4.4 %
	   - Belts: 118 tons, 4.4 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 0 tons, 0.0 %
	   - Armour Deck: 0 tons, 0.0 %
	   - Conning Tower: 0 tons, 0.0 %
	Machinery: 1,637 tons, 61.1 %
	Hull, fittings & equipment: 579 tons, 21.6 %
	Fuel, ammunition & stores: 325 tons, 12.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  585 lbs / 265 Kg = 18.3 x 4.0 " / 102 mm shells or 0.3 torpedoes
	Stability (Unstable if below 1.00): 1.83
	Metacentric height 3.1 ft / 0.9 m
	Roll period: 9.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 56 %
			- Recoil effect (Restricted arc if above 1.00): 0.07
	Seaboat quality  (Average = 1.00): 1.26

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.494
	Length to Beam Ratio: 9.74 : 1
	'Natural speed' for length: 19.24 kts
	Power going to wave formation at top speed: 66 %
	Trim (Max stability = 0, Max steadiness = 100): 45
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 1.50 ft / 0.46 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		22.00 ft / 6.71 m
	   - Forecastle (34 %):	21.00 ft / 6.40 m
	   - Mid (34 %):		20.00 ft / 6.10 m (14.00 ft / 4.27 m aft of break)
	   - Quarterdeck (13 %):	14.00 ft / 4.27 m
	   - Stern:		15.00 ft / 4.57 m
	   - Average freeboard:	16.58 ft / 5.05 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 203.1 %
		- Above water (accommodation/working, high = better): 124.0 %
	Waterplane Area: 9,317 Square feet or 866 Square metres
	Displacement factor (Displacement / loading): 61 %
	Structure weight / hull surface area: 32 lbs/sq ft or 155 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.49
		- Longitudinal: 1.65
		- Overall: 0.56
	Hull space for machinery, storage, compartmentation is extremely poor
	Room for accommodation and workspaces is excellent
	Good seaboat, rides out heavy weather easily

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