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Thursday, February 03, 2005

My Ger/BB/1907 with better SHP/ton

With a better SHP/ton for the machinery, I was almost able to match my hopes for the design from 1973. I had hoped for 30 knots, but I have settled for 29 knots (still faster than the original 1971 concept). The design carries 8-12in BLR and 12-4in QF guns. The belt is 13in with a 3.5in deck. The A/T bulkhead is 2 inches. This is the report:
Ger/BB/1907, Germany Battleship laid down 1907 (Engine 1914)

Displacement:
	26,745 t light; 27,721 t standard; 30,292 t normal; 32,349 t full load

Dimensions: Length overall / water x beam x draught
	620.00 ft / 620.00 ft x 105.00 ft x 34.00 ft (normal load)
	188.98 m / 188.98 m x 32.00 m  x 10.36 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1907 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1907 Model
	  Quick firing guns in deck mounts with hoists
	  on side, evenly spread, all raised mounts
	Weight of broadside 7,296 lbs / 3,309 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.0" / 330 mm	480.00 ft / 146.30 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 119 % of normal length

   - Torpedo Bulkhead:
		2.00" / 51 mm	480.00 ft / 146.30 m	24.00 ft / 7.32 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	11.0" / 279 mm	7.00" / 178 mm		12.0" / 305 mm
	2nd:	1.00" / 25 mm	      -			      -

   - Armour deck: 3.50" / 89 mm, Conning tower: 10.00" / 254 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 117,442 shp / 87,612 Kw = 29.00 kts
	Range 7,500nm at 15.00 kts
	Bunker at max displacement = 4,628 tons

Complement:
	1,147 - 1,492

Cost:
	£2.336 million / $9.342 million

Distribution of weights at normal displacement:
	Armament: 912 tons, 3.0 %
	Armour: 10,654 tons, 35.2 %
	   - Belts: 4,432 tons, 14.6 %
	   - Torpedo bulkhead: 852 tons, 2.8 %
	   - Armament: 2,404 tons, 7.9 %
	   - Armour Deck: 2,756 tons, 9.1 %
	   - Conning Tower: 209 tons, 0.7 %
	Machinery: 4,524 tons, 14.9 %
	Hull, fittings & equipment: 10,655 tons, 35.2 %
	Fuel, ammunition & stores: 3,547 tons, 11.7 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  37,415 lbs / 16,971 Kg = 43.3 x 12.0 " / 305 mm shells or 6.7 torpedoes
	Stability (Unstable if below 1.00): 1.05
	Metacentric height 6.0 ft / 1.8 m
	Roll period: 18.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 59 %
			- Recoil effect (Restricted arc if above 1.00): 0.30
	Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.479
	Length to Beam Ratio: 5.90 : 1
	'Natural speed' for length: 24.90 kts
	Power going to wave formation at top speed: 57 %
	Trim (Max stability = 0, Max steadiness = 100): 52
	Bow angle (Positive = bow angles forward): -1.00 degrees
	Stern overhang: -1.00 ft / -0.30 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		29.00 ft / 8.84 m
	   - Forecastle (67 %):	27.00 ft / 8.23 m
	   - Mid (67 %):		27.00 ft / 8.23 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:	24.57 ft / 7.49 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 88.4 %
		- Above water (accommodation/working, high = better): 127.2 %
	Waterplane Area: 42,565 Square feet or 3,954 Square metres
	Displacement factor (Displacement / loading): 112 %
	Structure weight / hull surface area: 170 lbs/sq ft or 832 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.92
		- Longitudinal: 2.04
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent

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