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Sunday, January 09, 2005

I took another run at the Ger/CB/1915 design

I found a nice drawing (inboard profile and cross section of the hull, amidships, with armor thicknesses labeled. I couldn't ignore that, so I tried a 35 knot version. Except for being large, I like how it turned out. The ship has a tower foremast and three funnels. There are two triple 16.5in turrets forward (one superfiring), and four triple 6in turrets aft.
Ger/CB/1915 D1, Germany Enter ship type laid down 1915

Displacement:
	46,288 t light; 48,180 t standard; 52,997 t normal; 56,850 t full load

Dimensions: Length overall / water x beam x draught
	901.89 ft / 900.00 ft x 100.00 ft x 30.00 ft (normal load)
	274.90 m / 274.32 m x 30.48 m  x 9.14 m

Armament:
      6 - 16.50" / 419 mm guns (2x3 guns), 2,246.06lbs / 1,018.80kg shells, 1915 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline, all forward, all raised mounts - superfiring
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1915 Model
	  Quick firing guns in turrets (on barbettes)
	  on side, all aft, all raised mounts - superfiring
	Weight of broadside 14,772 lbs / 6,701 kg
	Shells per gun, main battery: 100

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	8.00" / 203 mm	420.00 ft / 128.02 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 72 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		1.00" / 25 mm	420.00 ft / 128.02 m	28.00 ft / 8.53 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	8.00" / 203 mm	6.00" / 152 mm		8.00" / 203 mm
	2nd:	4.00" / 102 mm	3.00" / 76 mm		4.00" / 102 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 8.00" / 203 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 6 shafts, 316,605 shp / 236,187 Kw = 35.00 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 8,670 tons

Complement:
	1,746 - 2,270

Cost:
	£7.055 million / $28.219 million

Distribution of weights at normal displacement:
	Armament: 1,847 tons, 3.5 %
	Armour: 10,889 tons, 20.5 %
	   - Belts: 2,417 tons, 4.6 %
	   - Torpedo bulkhead: 435 tons, 0.8 %
	   - Armament: 2,517 tons, 4.8 %
	   - Armour Deck: 5,276 tons, 10.0 %
	   - Conning Tower: 243 tons, 0.5 %
	Machinery: 11,993 tons, 22.6 %
	Hull, fittings & equipment: 21,560 tons, 40.7 %
	Fuel, ammunition & stores: 6,709 tons, 12.7 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  62,316 lbs / 28,266 Kg = 27.7 x 16.5 " / 419 mm shells or 5.5 torpedoes
	Stability (Unstable if below 1.00): 1.12
	Metacentric height 6.2 ft / 1.9 m
	Roll period: 16.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 55 %
			- Recoil effect (Restricted arc if above 1.00): 0.94
	Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.687
	Length to Beam Ratio: 9.00 : 1
	'Natural speed' for length: 30.00 kts
	Power going to wave formation at top speed: 57 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 3.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		36.00 ft / 10.97 m
	   - Forecastle (20 %):	33.00 ft / 10.06 m
	   - Mid (74 %):		33.00 ft / 10.06 m (25.00 ft / 7.62 m aft of break)
	   - Quarterdeck (15 %):	25.00 ft / 7.62 m
	   - Stern:		25.00 ft / 7.62 m
	   - Average freeboard:	31.16 ft / 9.50 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 124.7 %
		- Above water (accommodation/working, high = better): 246.2 %
	Waterplane Area: 71,302 Square feet or 6,624 Square metres
	Displacement factor (Displacement / loading): 107 %
	Structure weight / hull surface area: 205 lbs/sq ft or 1,003 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.97
		- Longitudinal: 1.32
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent

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