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Saturday, January 22, 2005

My latest attempt at the Ger/CL/1914 (a2)

I found my drawing of the Ger/CL/1914 from 2002, and decided to try again at using Springsharp. The ship is 430ft x 40ft x 17ft, and was intended to make 32 knots. The armament was 9-5in QF guns and 2-21in TT. The ship has a raised forecastle (at 35% of the length) and has three uncased funnels. The foremast and mainmast are both poles, with a crow's nest on the foremast. The aft 5in guns are superfiring on my drawing. There are 3-5in guns on each side with the rest on the centerline. The ship is relatively fast and a good seaboat. This is the report:
Ger/CL/1914, Germany Light Cruiser laid down 1914

Displacement:
	3,948 t light; 4,081 t standard; 4,286 t normal; 4,450 t full load

Dimensions: Length overall / water x beam x draught
	430.80 ft / 430.00 ft x 40.00 ft x 17.00 ft (normal load)
	131.31 m / 131.06 m x 12.19 m  x 5.18 m

Armament:
      9 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1914 Model
	  Breech loading guns in deck mounts 
	  on side ends, majority forward, all raised mounts - superfiring
	Weight of broadside 563 lbs / 255 kg
	Shells per gun, main battery: 150
	2 - 21.0" / 533.4 mm above water torpedoes

Armour:

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 50,376 shp / 37,580 Kw = 31.00 kts
	Range 2,950nm at 12.00 kts
	Bunker at max displacement = 368 tons

Complement:
	264 - 344

Cost:
	£0.590 million / $2.361 million

Distribution of weights at normal displacement:
	Armament: 70 tons, 1.6 %
	Armour: 452 tons, 10.5 %
	   - Belts: 0 tons, 0.0 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 0 tons, 0.0 %
	   - Armour Deck: 429 tons, 10.0 %
	   - Conning Tower: 23 tons, 0.5 %
	Machinery: 1,904 tons, 44.4 %
	Hull, fittings & equipment: 1,522 tons, 35.5 %
	Fuel, ammunition & stores: 337 tons, 7.9 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  2,259 lbs / 1,024 Kg = 36.1 x 5.0 " / 127 mm shells or 0.5 torpedoes
	Stability (Unstable if below 1.00): 1.32
	Metacentric height 2.1 ft / 0.6 m
	Roll period: 11.7 seconds
	Steadiness	- As gun platform (Average = 50 %): 61 %
			- Recoil effect (Restricted arc if above 1.00): 0.29
	Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.513
	Length to Beam Ratio: 10.75 : 1
	'Natural speed' for length: 20.74 kts
	Power going to wave formation at top speed: 62 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		23.00 ft / 7.01 m
	   - Forecastle (20 %):	20.00 ft / 6.10 m
	   - Mid (35 %):		20.00 ft / 6.10 m (15.00 ft / 4.57 m aft of break)
	   - Quarterdeck (15 %):	15.00 ft / 4.57 m
	   - Stern:		15.00 ft / 4.57 m
	   - Average freeboard:	16.99 ft / 5.18 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 156.2 %
		- Above water (accommodation/working, high = better): 124.3 %
	Waterplane Area: 11,597 Square feet or 1,077 Square metres
	Displacement factor (Displacement / loading): 88 %
	Structure weight / hull surface area: 66 lbs/sq ft or 323 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.90
		- Longitudinal: 2.40
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent
	Good seaboat, rides out heavy weather easily

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