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Tuesday, January 11, 2005

This is another odd result: the Ger/BB/1907 Design Study A1

I have this Italian-looking German battleship design. I'm calling it the Ger/BB/1907 Design Study A1. The ship has 15-11in/45 guns (43 tons). That is the main feature of the ship. I had only allowed for 20 knots, but in Springsharp, I got 25 knots on a smaller displacement. Not only that, it is a good seaboat:
Ger/BB/1907 Design Study A1, Germany Battleship laid down 1907

Displacement:
	24,685 t light; 25,871 t standard; 27,398 t normal; 28,618 t full load

Dimensions: Length overall / water x beam x draught
	580.00 ft / 580.00 ft x 100.00 ft x 33.00 ft (normal load)
	176.78 m / 176.78 m x 30.48 m  x 10.06 m

Armament:
      15 - 11.00" / 279 mm guns (5 mounts), 665.50lbs / 301.87kg shells, 1907 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline, evenly spread, 11 raised guns
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1907 Model
	  Quick firing guns in casemate mounts 
	  on side, evenly spread, 6 raised mounts
	  6 guns in hull casemates - Limited use in heavy seas
	Weight of broadside 11,279 lbs / 5,116 kg
	Shells per gun, main battery: 100

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	12.0" / 305 mm	376.00 ft / 114.60 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 100 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		2.00" / 51 mm	375.00 ft / 114.30 m	28.00 ft / 8.53 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	11.0" / 279 mm	6.00" / 152 mm		10.0" / 254 mm
	2nd:	6.00" / 152 mm	4.00" / 102 mm		4.00" / 102 mm

   - Armour deck: 2.50" / 64 mm, Conning tower: 9.00" / 229 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 63,228 shp / 47,168 Kw = 25.00 kts
	Range 5,400nm at 12.00 kts
	Bunker at max displacement = 2,747 tons

Complement:
	1,064 - 1,384

Cost:
	£2.551 million / $10.205 million

Distribution of weights at normal displacement:
	Armament: 1,410 tons, 5.1 %
	Armour: 8,942 tons, 32.6 %
	   - Belts: 3,167 tons, 11.6 %
	   - Torpedo bulkhead: 777 tons, 2.8 %
	   - Armament: 3,032 tons, 11.1 %
	   - Armour Deck: 1,789 tons, 6.5 %
	   - Conning Tower: 176 tons, 0.6 %
	Machinery: 3,593 tons, 13.1 %
	Hull, fittings & equipment: 10,741 tons, 39.2 %
	Fuel, ammunition & stores: 2,713 tons, 9.9 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  32,510 lbs / 14,746 Kg = 48.9 x 11.0 " / 279 mm shells or 5.2 torpedoes
	Stability (Unstable if below 1.00): 1.01
	Metacentric height 5.1 ft / 1.6 m
	Roll period: 18.5 seconds
	Steadiness	- As gun platform (Average = 50 %): 67 %
			- Recoil effect (Restricted arc if above 1.00): 0.69
	Seaboat quality  (Average = 1.00): 1.34

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.501
	Length to Beam Ratio: 5.80 : 1
	'Natural speed' for length: 24.08 kts
	Power going to wave formation at top speed: 52 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 0.00 degrees
	Stern overhang: -2.00 ft / -0.61 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		28.00 ft / 8.53 m
	   - Forecastle (20 %):	28.00 ft / 8.53 m
	   - Mid (43 %):		28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
	   - Quarterdeck (15 %):	20.00 ft / 6.10 m
	   - Stern:		20.00 ft / 6.10 m
	   - Average freeboard:	23.44 ft / 7.14 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 101.9 %
		- Above water (accommodation/working, high = better): 158.1 %
	Waterplane Area: 38,679 Square feet or 3,593 Square metres
	Displacement factor (Displacement / loading): 100 %
	Structure weight / hull surface area: 189 lbs/sq ft or 922 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.92
		- Longitudinal: 2.21
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent
	Good seaboat, rides out heavy weather easily

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