Another design study: Ger/CB/1915b1

By somewhat inflating my early 1970's design study for a 1915 German battlecruiser, I was able to achieve something good. The original intent was for a normal displacement of 37,500 tons. I can only guess at the protection, but I seem to have less than my original study. I had to settle for 32 knots rather than 36 knots, as well. My drawing is of a ship with three stacks and a tripod foremast with a large top, and a platform for a director. The mainmast is also a tripod.

Ger/CB/1915b1, Germany Battlecruiser laid down 1915

Displacement:
	35,643 t light; 37,371 t standard; 40,398 t normal; 42,820 t full load

Dimensions: Length overall / water x beam x draught
	787.50 ft / 787.50 ft x 98.00 ft x 31.00 ft (normal load)
	240.03 m / 240.03 m x 29.87 m  x 9.45 m

Armament:
      6 - 16.00" / 406 mm guns (3x2 guns), 2,048.00lbs / 928.96kg shells, 1915 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline, evenly spread, all raised mounts
	  Aft Main mounts separated by engine room
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1915 Model
	  Quick firing guns in deck mounts 
	  on side, all forward, all raised mounts - superfiring
	Weight of broadside 13,584 lbs / 6,162 kg
	Shells per gun, main battery: 120

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	9.00" / 229 mm	450.00 ft / 137.16 m	10.00 ft / 3.05 m
	Ends:	4.00" / 102 mm	265.00 ft / 80.77 m	10.00 ft / 3.05 m
	  72.50 ft / 22.10 m Unarmoured ends
	Upper:	6.00" / 152 mm	450.00 ft / 137.16 m	8.00 ft / 2.44 m
	  Main Belt covers 88 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	10.0" / 254 mm	8.00" / 203 mm		10.0" / 254 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 3.50" / 89 mm, Conning tower: 12.00" / 305 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 191,368 shp / 142,760 Kw = 32.00 kts
	Range 7,500nm at 15.00 kts
	Bunker at max displacement = 5,449 tons

Complement:
	1,424 - 1,852

Cost:
	£5.365 million / $21.461 million

Distribution of weights at normal displacement:
	Armament: 1,698 tons, 4.2 %
	Armour: 9,809 tons, 24.3 %
	   - Belts: 3,108 tons, 7.7 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 2,772 tons, 6.9 %
	   - Armour Deck: 3,624 tons, 9.0 %
	   - Conning Tower: 304 tons, 0.8 %
	Machinery: 7,249 tons, 17.9 %
	Hull, fittings & equipment: 16,887 tons, 41.8 %
	Fuel, ammunition & stores: 4,755 tons, 11.8 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  48,894 lbs / 22,178 Kg = 23.9 x 16.0 " / 406 mm shells or 3.3 torpedoes
	Stability (Unstable if below 1.00): 1.04
	Metacentric height 5.2 ft / 1.6 m
	Roll period: 18.0 seconds
	Steadiness	- As gun platform (Average = 50 %): 56 %
			- Recoil effect (Restricted arc if above 1.00): 0.98
	Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.591
	Length to Beam Ratio: 8.04 : 1
	'Natural speed' for length: 28.06 kts
	Power going to wave formation at top speed: 55 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -1.00 degrees
	Stern overhang: -2.00 ft / -0.61 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		32.00 ft / 9.75 m
	   - Forecastle (18 %):	30.00 ft / 9.14 m
	   - Mid (76 %):		30.00 ft / 9.14 m (20.00 ft / 6.10 m aft of break)
	   - Quarterdeck (18 %):	20.00 ft / 6.10 m
	   - Stern:		20.00 ft / 6.10 m
	   - Average freeboard:	27.74 ft / 8.46 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 90.4 %
		- Above water (accommodation/working, high = better): 217.1 %
	Waterplane Area: 55,971 Square feet or 5,200 Square metres
	Displacement factor (Displacement / loading): 107 %
	Structure weight / hull surface area: 203 lbs/sq ft or 989 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.54
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent