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Saturday, January 29, 2005

The Ger/CL/1927 design

I have a 1927 design for the Germans, and it works quite nicely, except for the size. Again, the SHP/ton is the problem.
Ger/CL/1927, Germany Light Cruiser laid down 1927

Displacement:
	8,667 t light; 8,983 t standard; 9,937 t normal; 10,701 t full load

Dimensions: Length overall / water x beam x draught
	590.94 ft / 590.00 ft x 58.00 ft x 22.00 ft (normal load)
	180.12 m / 179.83 m x 17.68 m  x 6.71 m

Armament:
      9 - 5.91" / 150 mm guns (3x3 guns), 102.98lbs / 46.71kg shells, 1927 Model
	  Quick firing guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      10 - 4.13" / 105 mm guns (5x2 guns), 35.32lbs / 16.02kg shells, 1927 Model
	  Dual purpose guns in deck mounts with hoists
	  on side ends, majority aft, all raised mounts - superfiring
      18 - 1.46" / 37.0 mm guns (9x2 guns), 1.55lbs / 0.70kg shells, 1927 Model
	  Dual purpose guns in deck mounts 
	  on side ends, majority forward
	Weight of broadside 1,308 lbs / 593 kg
	Shells per gun, main battery: 150
	12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	3.00" / 76 mm	465.00 ft / 141.73 m	12.00 ft / 3.66 m
	Ends:	Unarmoured
	  Main Belt covers 121 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		1.00" / 25 mm	465.00 ft / 141.73 m	16.00 ft / 4.88 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	3.00" / 76 mm	2.00" / 51 mm		3.00" / 76 mm
	2nd:	2.00" / 51 mm	2.00" / 51 mm		2.00" / 51 mm

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

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 80,944 shp / 60,384 Kw = 33.00 kts
	Range 7,500nm at 15.00 kts
	Bunker at max displacement = 1,718 tons

Complement:
	496 - 646

Cost:
	£2.903 million / $11.613 million

Distribution of weights at normal displacement:
	Armament: 163 tons, 1.6 %
	Armour: 2,115 tons, 21.3 %
	   - Belts: 675 tons, 6.8 %
	   - Torpedo bulkhead: 275 tons, 2.8 %
	   - Armament: 288 tons, 2.9 %
	   - Armour Deck: 848 tons, 8.5 %
	   - Conning Tower: 30 tons, 0.3 %
	Machinery: 2,555 tons, 25.7 %
	Hull, fittings & equipment: 3,833 tons, 38.6 %
	Fuel, ammunition & stores: 1,271 tons, 12.8 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  12,066 lbs / 5,473 Kg = 117.2 x 5.9 " / 150 mm shells or 1.9 torpedoes
	Stability (Unstable if below 1.00): 1.17
	Metacentric height 2.9 ft / 0.9 m
	Roll period: 14.2 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.39
	Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
	Hull has rise forward of midbreak
	  and transom stern
	Block coefficient: 0.462
	Length to Beam Ratio: 10.17 : 1
	'Natural speed' for length: 27.81 kts
	Power going to wave formation at top speed: 56 %
	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:		27.00 ft / 8.23 m
	   - Forecastle (30 %):	23.00 ft / 7.01 m
	   - Mid (50 %):		23.00 ft / 7.01 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:	19.48 ft / 5.94 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 147.5 %
		- Above water (accommodation/working, high = better): 119.5 %
	Waterplane Area: 22,908 Square feet or 2,128 Square metres
	Displacement factor (Displacement / loading): 116 %
	Structure weight / hull surface area: 102 lbs/sq ft or 499 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.35
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is adequate

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