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Saturday, January 15, 2005

I thought I would try a German fast battleship from a sketch I had done way back

I have a sketch of a large, German fast battleship (30 knots) that I did way back. This is a ship with 9-18in and 20-5in guns. I had hoped to be able to do that on 50,000 tons, but with Springsharp, I had to go to 65,728 tons, normal displacement, to get a good ship. I had to guess at dimensions, as I don't see any on the drawing, itself. The ship has a vaguely Italian look with two funnels and a tower foremast with bridge structure around it. There is a pole foremast and a low pole mainmast.
Ger/BB/1921 Fast Battleship, Germany Battleship laid down 1921

Displacement:
	58,908 t light; 61,610 t standard; 65,728 t normal; 69,022 t full load

Dimensions: Length overall / water x beam x draught
	866.19 ft / 865.00 ft x 125.00 ft x 36.00 ft (normal load)
	264.01 m / 263.65 m x 38.10 m  x 10.97 m

Armament:
      9 - 18.00" / 457 mm guns (3x3 guns), 2,916.00lbs / 1,322.68kg shells, 1921 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      20 - 5.00" / 127 mm guns (2x10 guns), 62.50lbs / 28.35kg shells, 1921 Model
	  Quick firing guns in deck mounts with hoists
	  on side, evenly spread, all raised mounts
	Weight of broadside 27,494 lbs / 12,471 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	16.0" / 406 mm	562.00 ft / 171.30 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
		2.00" / 51 mm	562.00 ft / 171.30 m	31.00 ft / 9.45 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	16.0" / 406 mm	9.00" / 229 mm		14.0" / 356 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 5.00" / 127 mm, Conning tower: 12.00" / 305 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 170,613 shp / 127,278 Kw = 30.00 kts
	Range 9,600nm at 15.00 kts
	Bunker at max displacement = 7,413 tons

Complement:
	2,052 - 2,668

Cost:
	£14.690 million / $58.761 million

Distribution of weights at normal displacement:
	Armament: 3,437 tons, 5.2 %
	Armour: 21,199 tons, 32.3 %
	   - Belts: 6,629 tons, 10.1 %
	   - Torpedo bulkhead: 1,289 tons, 2.0 %
	   - Armament: 5,301 tons, 8.1 %
	   - Armour Deck: 7,558 tons, 11.5 %
	   - Conning Tower: 421 tons, 0.6 %
	Machinery: 5,875 tons, 8.9 %
	Hull, fittings & equipment: 28,397 tons, 43.2 %
	Fuel, ammunition & stores: 6,820 tons, 10.4 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  97,048 lbs / 44,020 Kg = 33.3 x 18.0 " / 457 mm shells or 14.7 torpedoes
	Stability (Unstable if below 1.00): 1.04
	Metacentric height 7.5 ft / 2.3 m
	Roll period: 19.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 62 %
			- Recoil effect (Restricted arc if above 1.00): 0.83
	Seaboat quality  (Average = 1.00): 1.23

Hull form characteristics:
	Hull has a flush deck
	  and transom stern
	Block coefficient: 0.591
	Length to Beam Ratio: 6.92 : 1
	'Natural speed' for length: 34.24 kts
	Power going to wave formation at top speed: 51 %
	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:		34.00 ft / 10.36 m
	   - Forecastle (20 %):	29.00 ft / 8.84 m
	   - Mid (0 %):		28.00 ft / 8.53 m
	   - Quarterdeck (15 %):	28.00 ft / 8.53 m
	   - Stern:		28.00 ft / 8.53 m
	   - Average freeboard:	28.50 ft / 8.69 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 81.5 %
		- Above water (accommodation/working, high = better): 211.2 %
	Waterplane Area: 81,713 Square feet or 7,591 Square metres
	Displacement factor (Displacement / loading): 109 %
	Structure weight / hull surface area: 257 lbs/sq ft or 1,253 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.52
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is excellent
	Room for accommodation and workspaces is excellent
	Good seaboat, rides out heavy weather easily

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