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Wednesday, February 02, 2005

My answer to the GB/BB/1914: the Ger/BB/1916

I would have built these in numbers to contest the North Sea and Channel against what the British were building. This is the original concept, with 9-18in BLR and 24-5in QF guns. It has the thick armor, as in the original, but higher speed. I wanted a good mix of stability, hull strength, and seakeeping ability, and this is what resulted (from my 1971 notes):
Ger/BB/1916, Germany Battleship laid down 1916 (Engine 1927)

Displacement:
	61,391 t light; 64,163 t standard; 68,510 t normal; 71,987 t full load

Dimensions: Length overall / water x beam x draught
	763.01 ft / 760.00 ft x 132.00 ft x 37.00 ft (normal load)
	232.57 m / 231.65 m x 40.23 m  x 11.28 m

Armament:
      9 - 18.00" / 457 mm guns (3x3 guns), 2,916.00lbs / 1,322.68kg shells, 1916 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      24 - 5.00" / 127 mm guns (12x2 guns), 62.50lbs / 28.35kg shells, 1916 Model
	  Quick firing guns in deck mounts with hoists
	  on side, evenly spread, all raised mounts
	Weight of broadside 27,744 lbs / 12,584 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	18.0" / 457 mm	575.00 ft / 175.26 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 116 % of normal length

   - Torpedo Bulkhead:
		3.00" / 76 mm	575.00 ft / 175.26 m	34.00 ft / 10.36 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	18.0" / 457 mm	10.0" / 254 mm		18.0" / 457 mm
	2nd:	2.00" / 51 mm	      -			      -

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

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 146,312 shp / 109,149 Kw = 27.00 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 7,824 tons

Complement:
	2,116 - 2,752

Cost:
	£9.341 million / $37.364 million

Distribution of weights at normal displacement:
	Armament: 3,468 tons, 5.1 %
	Armour: 27,475 tons, 40.1 %
	   - Belts: 7,532 tons, 11.0 %
	   - Torpedo bulkhead: 2,170 tons, 3.2 %
	   - Armament: 6,007 tons, 8.8 %
	   - Armour Deck: 11,332 tons, 16.5 %
	   - Conning Tower: 433 tons, 0.6 %
	Machinery: 4,618 tons, 6.7 %
	Hull, fittings & equipment: 25,830 tons, 37.7 %
	Fuel, ammunition & stores: 7,119 tons, 10.4 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  105,427 lbs / 47,821 Kg = 36.2 x 18.0 " / 457 mm shells or 20.6 torpedoes
	Stability (Unstable if below 1.00): 1.06
	Metacentric height 8.6 ft / 2.6 m
	Roll period: 18.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 56 %
			- Recoil effect (Restricted arc if above 1.00): 0.59
	Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
	Hull has a flush deck
	Block coefficient: 0.646
	Length to Beam Ratio: 5.76 : 1
	'Natural speed' for length: 27.57 kts
	Power going to wave formation at top speed: 53 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 2.00 ft / 0.61 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		29.00 ft / 8.84 m
	   - Forecastle (0 %):	25.00 ft / 7.62 m
	   - Mid (0 %):		25.00 ft / 7.62 m
	   - Quarterdeck (15 %):	25.00 ft / 7.62 m
	   - Stern:		25.00 ft / 7.62 m
	   - Average freeboard:	25.00 ft / 7.62 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 71.0 %
		- Above water (accommodation/working, high = better): 172.3 %
	Waterplane Area: 76,569 Square feet or 7,114 Square metres
	Displacement factor (Displacement / loading): 106 %
	Structure weight / hull surface area: 255 lbs/sq ft or 1,243 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.62
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is excellent
	Room for accommodation and workspaces is excellent

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