A German battlecruiser design study that is really a fast battleship

I realized that this design study that I did, probably in the early 1970's, was similar to a fast battleship. The ship is from about 1905, with 11in side armor and a 2.5in deck. The armament is 8-12in and 12-6in guns. The speed was intended to be 28.6 knots (or even more), but all I could reasonably get from Springsharp was 27 knots. That is still an interesting ship. That is because the length is only 600 feet. That is much better than my British battlecruiser with a 9in armor basis and 31 knots, which ballooned to something like 45,000 tons. Hopefully there are no data entry problems distorting the result!

Germany, Ger/CB/1905 design study D1 Battlecruiser laid down 1905

Displacement:
	25,967 t light; 26,930 t standard; 29,423 t normal; 31,418 t full load

Dimensions: Length overall / water x beam x draught
	600.00 ft / 600.00 ft x 95.00 ft x 29.00 ft (normal load)
	182.88 m / 182.88 m x 28.96 m  x 8.84 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1905 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, 1905 Model
	  Quick firing guns in casemate mounts 
	  on side, evenly spread
	  12 guns in hull casemates - Limited use in heavy seas
	Weight of broadside 8,208 lbs / 3,723 kg
	Shells per gun, main battery: 80

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	11.0" / 279 mm	370.00 ft / 112.78 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 95 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		1.50" / 38 mm	370.00 ft / 112.78 m	24.00 ft / 7.32 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	11.0" / 279 mm	6.00" / 152 mm		9.00" / 229 mm
	2nd:	5.00" / 127 mm	3.00" / 76 mm		2.00" / 51 mm

   - Armour deck: 2.50" / 64 mm, Conning tower: 11.00" / 279 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 92,993 shp / 69,373 Kw = 27.00 kts
	Range 4,500nm at 15.00 kts
	Bunker at max displacement = 4,488 tons

Complement:
	1,123 - 1,460

Cost:
	£2.757 million / $11.028 million

Distribution of weights at normal displacement:
	Armament: 1,026 tons, 3.5 %
	Armour: 7,893 tons, 26.8 %
	   - Belts: 3,075 tons, 10.5 %
	   - Torpedo bulkhead: 493 tons, 1.7 %
	   - Armament: 2,129 tons, 7.2 %
	   - Armour Deck: 1,970 tons, 6.7 %
	   - Conning Tower: 226 tons, 0.8 %
	Machinery: 7,045 tons, 23.9 %
	Hull, fittings & equipment: 10,003 tons, 34.0 %
	Fuel, ammunition & stores: 3,456 tons, 11.7 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  28,887 lbs / 13,103 Kg = 33.4 x 12.0 " / 305 mm shells or 3.6 torpedoes
	Stability (Unstable if below 1.00): 1.17
	Metacentric height 6.2 ft / 1.9 m
	Roll period: 16.0 seconds
	Steadiness	- As gun platform (Average = 50 %): 53 %
			- Recoil effect (Restricted arc if above 1.00): 0.46
	Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.623
	Length to Beam Ratio: 6.32 : 1
	'Natural speed' for length: 24.49 kts
	Power going to wave formation at top speed: 57 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	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:		26.00 ft / 7.92 m
	   - Forecastle (20 %):	25.00 ft / 7.62 m
	   - Mid (70 %):		25.00 ft / 7.62 m (16.00 ft / 4.88 m aft of break)
	   - Quarterdeck (15 %):	16.00 ft / 4.88 m
	   - Stern:		16.00 ft / 4.88 m
	   - Average freeboard:	22.38 ft / 6.82 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 131.3 %
		- Above water (accommodation/working, high = better): 165.6 %
	Waterplane Area: 42,591 Square feet or 3,957 Square metres
	Displacement factor (Displacement / loading): 97 %
	Structure weight / hull surface area: 167 lbs/sq ft or 813 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.59
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent