An odd design: GB/BB/1912 CDV design study

My friend Cliff conceived of a flush-decked ship, in the period before the outbreak of war, that would function as a coast defense vessel. The salient feature was that there were two triple turrets, giving a total of 6-12/50 guns and a secondary battery of 8-6in QF guns in casemates. The armor basis was 14 inches. I actually was able to tweak the design, by raising the freeboard a couple of feet, to get a good ship, although Springsharp doesn't like the fact that the composite strength is so great (1.76).

GB/BB/1912 CDV Design Study, Great Britain Battleship laid down 1912

Displacement:
	26,980 t light; 27,904 t standard; 29,000 t normal; 29,876 t full load

Dimensions: Length overall / water x beam x draught
	620.00 ft / 620.00 ft x 100.00 ft x 27.70 ft (normal load)
	188.98 m / 188.98 m x 30.48 m  x 8.44 m

Armament:
      6 - 12.00" / 305 mm guns (2x3 guns), 864.00lbs / 391.90kg shells, 1912 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
	  Quick firing guns in casemate mounts 
	  on side ends, evenly spread, all raised mounts - superfiring
	Weight of broadside 6,048 lbs / 2,743 kg
	Shells per gun, main battery: 100

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	14.0" / 356 mm	325.00 ft / 99.06 m	17.00 ft / 5.18 m
	Ends:	Unarmoured
	  Main Belt covers 81 % of normal length

   - Torpedo Bulkhead:
		2.00" / 51 mm	325.00 ft / 99.06 m	26.00 ft / 7.92 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	14.0" / 356 mm	9.00" / 229 mm		14.0" / 356 mm
	2nd:	4.00" / 102 mm	2.00" / 51 mm		2.00" / 51 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 14.00" / 356 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 40,477 shp / 30,196 Kw = 22.00 kts
	Range 4,500nm at 12.00 kts
	Bunker at max displacement = 1,971 tons

Complement:
	1,110 - 1,444

Cost:
	£1.805 million / $7.221 million

Distribution of weights at normal displacement:
	Armament: 756 tons, 2.6 %
	Armour: 9,632 tons, 33.2 %
	   - Belts: 3,581 tons, 12.3 %
	   - Torpedo bulkhead: 625 tons, 2.2 %
	   - Armament: 1,813 tons, 6.3 %
	   - Armour Deck: 3,327 tons, 11.5 %
	   - Conning Tower: 285 tons, 1.0 %
	Machinery: 1,614 tons, 5.6 %
	Hull, fittings & equipment: 14,979 tons, 51.7 %
	Fuel, ammunition & stores: 2,019 tons, 7.0 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  56,363 lbs / 25,566 Kg = 65.2 x 12.0 " / 305 mm shells or 14.4 torpedoes
	Stability (Unstable if below 1.00): 1.22
	Metacentric height 7.2 ft / 2.2 m
	Roll period: 15.6 seconds
	Steadiness	- As gun platform (Average = 50 %): 54 %
			- Recoil effect (Restricted arc if above 1.00): 0.11
	Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.591
	Length to Beam Ratio: 6.20 : 1
	'Natural speed' for length: 24.90 kts
	Power going to wave formation at top speed: 44 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 0.00 degrees
	Stern overhang: -2.00 ft / -0.61 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		25.00 ft / 7.62 m
	   - Forecastle (20 %):	24.00 ft / 7.32 m
	   - Mid (0 %):		24.00 ft / 7.32 m (0.00 ft / 0.00 m aft of break)
	   - Quarterdeck (15 %):	24.00 ft / 7.32 m
	   - Stern:		24.00 ft / 7.32 m
	   - Average freeboard:	13.88 ft / 4.23 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 48.6 %
		- Above water (accommodation/working, high = better): 64.1 %
	Waterplane Area: 44,966 Square feet or 4,177 Square metres
	Displacement factor (Displacement / loading): 153 %
	Structure weight / hull surface area: 262 lbs/sq ft or 1,280 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 1.80
		- Longitudinal: 1.75
		- Overall: 1.76
	Hull space for machinery, storage, compartmentation is excellent
	Room for accommodation and workspaces is cramped