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Saturday, January 15, 2005

Another one of these "stubby" battleships: Ger/BB/1915 Design Study E1

I have this drawing, which I was amazed to see was to scale, for a 680ft battleship with 12-16in/45 and 20-5in QF guns. I had optimistically hoped for an 18in armor basis, but I had to settle for a 16in basis, which wasn't too bad. As usual, I almost was forced to go to a higher speed, to increase low weights to improve stability. The ship is flush-decked with a single, large funnel. There is the tower mast with surrounding bridgework, so the ship looks somewhat Italian to my eye. The bow is raked, and there are polemasts, with the formast being tall, and the mainmast being very short.
Ger/BB/1915 Design Study E1, Germany Battleship laid down 1915

Displacement:
	49,519 t light; 51,936 t standard; 55,647 t normal; 58,615 t full load

Dimensions: Length overall / water x beam x draught
	681.94 ft / 680.00 ft x 120.00 ft x 36.00 ft (normal load)
	207.86 m / 207.26 m x 36.58 m  x 10.97 m

Armament:
      12 - 16.00" / 406 mm guns (4x3 guns), 2,048.00lbs / 928.96kg shells, 1915 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1915 Model
	  Quick firing guns in deck mounts with hoists
	  on side, evenly spread
	Weight of broadside 25,826 lbs / 11,714 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	16.0" / 406 mm	390.00 ft / 118.87 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 88 % of normal length

   - Torpedo Bulkhead:
		3.00" / 76 mm	390.00 ft / 118.87 m	32.00 ft / 9.75 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	12.0" / 305 mm	8.00" / 203 mm		16.0" / 406 mm
	2nd:	2.00" / 51 mm	1.00" / 25 mm		1.00" / 25 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 12.00" / 305 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 99,307 shp / 74,083 Kw = 25.00 kts
	Range 7,500nm at 15.00 kts
	Bunker at max displacement = 6,680 tons

Complement:
	1,811 - 2,355

Cost:
	£7.231 million / $28.925 million

Distribution of weights at normal displacement:
	Armament: 3,228 tons, 5.8 %
	Armour: 21,733 tons, 39.1 %
	   - Belts: 4,888 tons, 8.8 %
	   - Torpedo bulkhead: 1,385 tons, 2.5 %
	   - Armament: 5,721 tons, 10.3 %
	   - Armour Deck: 9,362 tons, 16.8 %
	   - Conning Tower: 377 tons, 0.7 %
	Machinery: 3,762 tons, 6.8 %
	Hull, fittings & equipment: 20,796 tons, 37.4 %
	Fuel, ammunition & stores: 6,128 tons, 11.0 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  75,652 lbs / 34,315 Kg = 36.9 x 16.0 " / 406 mm shells or 12.9 torpedoes
	Stability (Unstable if below 1.00): 1.01
	Metacentric height 6.7 ft / 2.0 m
	Roll period: 19.5 seconds
	Steadiness	- As gun platform (Average = 50 %): 57 %
			- Recoil effect (Restricted arc if above 1.00): 0.80
	Seaboat quality  (Average = 1.00): 1.18

Hull form characteristics:
	Hull has a flush deck
	Block coefficient: 0.663
	Length to Beam Ratio: 5.67 : 1
	'Natural speed' for length: 26.08 kts
	Power going to wave formation at top speed: 53 %
	Trim (Max stability = 0, Max steadiness = 100): 48
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 1.00 ft / 0.30 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		27.00 ft / 8.23 m
	   - Forecastle (20 %):	24.00 ft / 7.32 m
	   - Mid (0 %):		24.00 ft / 7.32 m
	   - Quarterdeck (15 %):	24.00 ft / 7.32 m
	   - Stern:		24.00 ft / 7.32 m
	   - Average freeboard:	24.24 ft / 7.39 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 78.8 %
		- Above water (accommodation/working, high = better): 159.7 %
	Waterplane Area: 63,257 Square feet or 5,877 Square metres
	Displacement factor (Displacement / loading): 101 %
	Structure weight / hull surface area: 243 lbs/sq ft or 1,185 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.78
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is excellent
	Room for accommodation and workspaces is excellent

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