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Saturday, January 15, 2005

I had to accept less speed for my fast German light cruiser Ger/CL/1921

I just tried the Ger/CL/1921 very fast light cruiser. I had to accept a speed of 35 knots, but for that I got a good ship. The design has always been almost unprotected. There are just a few patched os 1/2in or 1in armor. The ship is trying to be like an Italian light cruiser from the 1920's or early 1930's, and is like a large destroyer, but better armed and with more seakeeping ability. I am started to insist on good seakeeping ability in what I do, despite the cost.
Ger/CL/1921 Fast A1, Germany Light Cruiser laid down 1921

Displacement:
	6,660 t light; 6,909 t standard; 7,331 t normal; 7,669 t full load

Dimensions: Length overall / water x beam x draught
	555.00 ft / 555.00 ft x 55.00 ft x 18.00 ft (normal load)
	169.16 m / 169.16 m x 16.76 m  x 5.49 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1921 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1921 Model
	  Quick firing guns in deck mounts 
	  on side, evenly spread, all raised mounts
	Weight of broadside 992 lbs / 450 kg
	Shells per gun, main battery: 180
	4 - 23.6" / 599.44 mm above water torpedoes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	1.00" / 25 mm	120.00 ft / 36.58 m	8.00 ft / 2.44 m
	Ends:	Unarmoured
	  Main Belt covers 33 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	1.00" / 25 mm	0.50" / 13 mm		0.50" / 13 mm
	2nd:	1.00" / 25 mm	      -			      -

   - Armour deck: 0.50" / 13 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 86,889 shp / 64,819 Kw = 35.00 kts
	Range 3,600nm at 15.00 kts
	Bunker at max displacement = 759 tons

Complement:
	395 - 514

Cost:
	£1.925 million / $7.699 million

Distribution of weights at normal displacement:
	Armament: 124 tons, 1.7 %
	Armour: 302 tons, 4.1 %
	   - Belts: 51 tons, 0.7 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 62 tons, 0.8 %
	   - Armour Deck: 190 tons, 2.6 %
	   - Conning Tower: 0 tons, 0.0 %
	Machinery: 2,992 tons, 40.8 %
	Hull, fittings & equipment: 3,242 tons, 44.2 %
	Fuel, ammunition & stores: 671 tons, 9.2 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  5,070 lbs / 2,300 Kg = 46.9 x 6.0 " / 152 mm shells or 0.8 torpedoes
	Stability (Unstable if below 1.00): 1.27
	Metacentric height 3.1 ft / 1.0 m
	Roll period: 13.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 56 %
			- Recoil effect (Restricted arc if above 1.00): 0.39
	Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
	Hull has rise forward of midbreak
	  and transom stern
	Block coefficient: 0.467
	Length to Beam Ratio: 10.09 : 1
	'Natural speed' for length: 26.97 kts
	Power going to wave formation at top speed: 61 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 0.00 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 (20 %):	26.00 ft / 7.92 m
	   - Mid (37 %):		26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
	   - Quarterdeck (15 %):	18.00 ft / 5.49 m
	   - Stern:		18.00 ft / 5.49 m
	   - Average freeboard:	21.04 ft / 6.41 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 145.4 %
		- Above water (accommodation/working, high = better): 176.2 %
	Waterplane Area: 20,524 Square feet or 1,907 Square metres
	Displacement factor (Displacement / loading): 101 %
	Structure weight / hull surface area: 92 lbs/sq ft or 451 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.92
		- Longitudinal: 1.96
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent

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