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Tuesday, February 01, 2005

If you allow for higher output machinery, the GB/CB/1905 is a supership

I adjusted the machinery date in Springsharp, so as to get a higher SHP/ton reading, and with that, the GB/CB/1905 works really well. I was actually able to add armor, and go with my revised speed of 33 knots. Frank Fox's advice was to have more and smaller caliber guns. David K. Brown had a similar comment, as well as suggesting that the belt be increased to 6in. I have posted on this subject before, but this is the first time that I have achieved a satisfactory design (essentially by cheating on power, but not unreasonably: 26.84 SHP/ton).
GB/CB/1905, Great Britain Battlecruiser laid down 1905 (Engine 1916)

Displacement:
	22,071 t light; 22,832 t standard; 25,295 t normal; 27,267 t full load

Dimensions: Length overall / water x beam x draught
	770.00 ft / 770.00 ft x 85.00 ft x 27.00 ft (normal load)
	234.70 m / 234.70 m x 25.91 m  x 8.23 m

Armament:
      4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts
      9 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
	  Quick firing guns in deck mounts with hoists
	  on side ends, majority aft, all raised mounts - superfiring
	Weight of broadside 4,428 lbs / 2,009 kg
	Shells per gun, main battery: 100

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	4.00" / 102 mm	510.00 ft / 155.45 m	21.00 ft / 6.40 m
	Ends:	Unarmoured
	  Main Belt covers 102 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		1.50" / 38 mm	510.00 ft / 155.45 m	25.00 ft / 7.62 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	9.00" / 229 mm	5.00" / 127 mm		8.00" / 203 mm
	2nd:	1.00" / 25 mm	      -			      -

   - Armour deck: 2.50" / 64 mm, Conning tower: 9.00" / 229 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 154,764 shp / 115,454 Kw = 33.00 kts
	Range 8,500nm at 15.00 kts
	Bunker at max displacement = 4,435 tons

Complement:
	1,002 - 1,303

Cost:
	£2.045 million / $8.179 million

Distribution of weights at normal displacement:
	Armament: 554 tons, 2.2 %
	Armour: 5,629 tons, 22.3 %
	   - Belts: 1,793 tons, 7.1 %
	   - Torpedo bulkhead: 708 tons, 2.8 %
	   - Armament: 943 tons, 3.7 %
	   - Armour Deck: 2,019 tons, 8.0 %
	   - Conning Tower: 167 tons, 0.7 %
	Machinery: 5,766 tons, 22.8 %
	Hull, fittings & equipment: 10,122 tons, 40.0 %
	Fuel, ammunition & stores: 3,225 tons, 12.7 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  31,134 lbs / 14,122 Kg = 36.0 x 12.0 " / 305 mm shells or 4.1 torpedoes
	Stability (Unstable if below 1.00): 1.15
	Metacentric height 5.1 ft / 1.6 m
	Roll period: 15.8 seconds
	Steadiness	- As gun platform (Average = 50 %): 70 %
			- Recoil effect (Restricted arc if above 1.00): 0.44
	Seaboat quality  (Average = 1.00): 1.40

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.501
	Length to Beam Ratio: 9.06 : 1
	'Natural speed' for length: 27.75 kts
	Power going to wave formation at top speed: 53 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -2.00 degrees
	Stern overhang: -1.00 ft / -0.30 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		33.00 ft / 10.06 m
	   - Forecastle (67 %):	30.00 ft / 9.14 m
	   - Mid (67 %):		30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
	   - Quarterdeck (15 %):	22.00 ft / 6.71 m
	   - Stern:		22.00 ft / 6.71 m
	   - Average freeboard:	28.16 ft / 8.58 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 118.8 %
		- Above water (accommodation/working, high = better): 182.5 %
	Waterplane Area: 43,647 Square feet or 4,055 Square metres
	Displacement factor (Displacement / loading): 117 %
	Structure weight / hull surface area: 146 lbs/sq ft or 713 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.97
		- Longitudinal: 1.43
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent
	Ship has slow, easy roll, a good, steady gun platform
	Good seaboat, rides out heavy weather easily

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