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Monday, January 31, 2005

My latest attempt at the Ger/CL/1914 design

The Ger/CL/1914 design is essentially a 3rd Class protected cruiser, whose sole protection is a 2in deck. That does some interesting things. For one, hull strength is easier to achieve. My current strategy for increasing hull strength while having a good seakeeping ability is to increase the draft. That will increase the composite strength by some amount. From there, I reduce the displacement to reduce the composite strength back to 1.0. That should increase the seakeeping ability. I keep doing that until I have a seakeeping ability above 1.0 along with adequate composite strength. As you can see, I increased the date on the engine, to get a better SHP/ton of machinery (to 34.32 SHP/ton). Real ships in 1914 actually were better than that. This is an issue with Springsharp that we can hope will be corrected.
Ger/CL/1914, Germany Light Cruiser laid down 1914 (Engine 1933)

Displacement:
	3,820 t light; 3,957 t standard; 4,307 t normal; 4,588 t full load

Dimensions: Length overall / water x beam x draught
	437.80 ft / 435.00 ft x 43.00 ft x 20.00 ft (normal load)
	133.44 m / 132.59 m x 13.11 m  x 6.10 m

Armament:
      9 - 5.12" / 130 mm guns in single mounts, 67.03lbs / 30.41kg shells, 1914 Model
	  Breech loading guns in deck mounts with hoists
	  on side ends, majority forward, all raised mounts - superfiring
	Weight of broadside 603 lbs / 274 kg
	Shells per gun, main battery: 150
	4 - 23.6" / 600.0001 mm above water torpedoes

Armour:
   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	2.00" / 51 mm	      -			      -

   - Armour deck: 2.00" / 51 mm, Conning tower: 3.00" / 76 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 54,846 shp / 40,915 Kw = 32.00 kts
	Range 4,500nm at 15.00 kts
	Bunker at max displacement = 632 tons

Complement:
	265 - 345

Cost:
	£0.536 million / $2.142 million

Distribution of weights at normal displacement:
	Armament: 75 tons, 1.8 %
	Armour: 496 tons, 11.5 %
	   - Belts: 0 tons, 0.0 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 52 tons, 1.2 %
	   - Armour Deck: 427 tons, 9.9 %
	   - Conning Tower: 17 tons, 0.4 %
	Machinery: 1,598 tons, 37.1 %
	Hull, fittings & equipment: 1,651 tons, 38.3 %
	Fuel, ammunition & stores: 487 tons, 11.3 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  2,605 lbs / 1,182 Kg = 38.9 x 5.1 " / 130 mm shells or 0.7 torpedoes
	Stability (Unstable if below 1.00): 1.18
	Metacentric height 1.9 ft / 0.6 m
	Roll period: 13.0 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.42
	Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.403
	Length to Beam Ratio: 10.12 : 1
	'Natural speed' for length: 20.86 kts
	Power going to wave formation at top speed: 60 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 2.00 ft / 0.61 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		23.00 ft / 7.01 m
	   - Forecastle (32 %):	21.00 ft / 6.40 m
	   - Mid (32 %):		21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break)
	   - Quarterdeck (15 %):	13.00 ft / 3.96 m
	   - Stern:		13.00 ft / 3.96 m
	   - Average freeboard:	15.82 ft / 4.82 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 133.7 %
		- Above water (accommodation/working, high = better): 87.7 %
	Waterplane Area: 11,534 Square feet or 1,072 Square metres
	Displacement factor (Displacement / loading): 100 %
	Structure weight / hull surface area: 75 lbs/sq ft or 368 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.92
		- Longitudinal: 2.14
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is cramped

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