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Saturday, January 15, 2005

I was just looking at my alternate design for the GB/CB/1905 battlecruises

I was looking at what I had proposed to my friend Cliff for the GB/CB/1905 battlecruisers. This is a ship that would be more acceptable to Frank Fox and D.K. Brown than what Cliff wanted to have. This ship has 6-12in/45 guns with the same 9-6in/50 QF guns mounted on deck. The armor, in this case, is a 6in belt, 16ft high, a 2.5in deck, and 10in turret faces and 8in barbettes for the 12in guns. I was only able to achieve 29 knots in Springsharp, but that is still not too bad for 1905. When you realize that the Invincibles also had a 6 gun broadside, this looks pretty good, except that the cost would have been unacceptable. The size ballooned all out of proportion, but the resulting ship is a good seaboat and has good stability. I realized that the belt was too short, so that grew to 500 ft long. Springsharp is still complaining, but I am happy, as the light and standard displacement aren't so out of line. Mostly, the range I specified is driving up the normal and maximum displacements.
GB/CB/1905 design study B1, Great Britain Battlecruiser laid down 1905

Displacement:
	29,113 t light; 30,087 t standard; 34,666 t normal; 38,329 t full load

Dimensions: Length overall / water x beam x draught
	770.00 ft / 770.00 ft x 85.00 ft x 26.00 ft (normal load)
	234.70 m / 234.70 m x 25.91 m  x 7.92 m

Armament:
      6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      9 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
	  Quick firing guns in deck mounts 
	  on side, evenly spread, all raised mounts
	Weight of broadside 6,156 lbs / 2,792 kg
	Shells per gun, main battery: 80

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	6.00" / 152 mm	500.00 ft / 152.40 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 100 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		1.50" / 38 mm	500.00 ft / 152.40 m	23.00 ft / 7.01 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	10.0" / 254 mm	4.00" / 102 mm		8.00" / 203 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 2.50" / 64 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 123,075 shp / 91,814 Kw = 29.00 kts
	Range 7,500nm at 15.00 kts
	Bunker at max displacement = 8,242 tons

Complement:
	1,269 - 1,651

Cost:
	£2.971 million / $11.883 million

Distribution of weights at normal displacement:
	Armament: 770 tons, 2.2 %
	Armour: 6,654 tons, 19.2 %
	   - Belts: 2,033 tons, 5.9 %
	   - Torpedo bulkhead: 638 tons, 1.8 %
	   - Armament: 1,528 tons, 4.4 %
	   - Armour Deck: 2,454 tons, 7.1 %
	   - Conning Tower: 0 tons, 0.0 %
	Machinery: 9,324 tons, 26.9 %
	Hull, fittings & equipment: 12,366 tons, 35.7 %
	Fuel, ammunition & stores: 5,553 tons, 16.0 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  40,932 lbs / 18,566 Kg = 47.4 x 12.0 " / 305 mm shells or 4.0 torpedoes
	Stability (Unstable if below 1.00): 1.19
	Metacentric height 5.4 ft / 1.7 m
	Roll period: 15.3 seconds
	Steadiness	- As gun platform (Average = 50 %): 83 %
			- Recoil effect (Restricted arc if above 1.00): 0.79
	Seaboat quality  (Average = 1.00): 1.66

Hull form characteristics:
	Hull has raised forecastle, rise forward of midbreak
	Block coefficient: 0.713
	Length to Beam Ratio: 9.06 : 1
	'Natural speed' for length: 27.75 kts
	Power going to wave formation at top speed: 51 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -2.00 degrees
	Stern overhang: -2.00 ft / -0.61 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		37.00 ft / 11.28 m
	   - Forecastle (20 %):	34.00 ft / 10.36 m (33.00 ft / 10.06 m aft of break)
	   - Mid (73 %):		32.00 ft / 9.75 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:	30.21 ft / 9.21 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 135.9 %
		- Above water (accommodation/working, high = better): 243.4 %
	Waterplane Area: 53,069 Square feet or 4,930 Square metres
	Displacement factor (Displacement / loading): 110 %
	Structure weight / hull surface area: 151 lbs/sq ft or 738 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.97
		- Longitudinal: 1.36
		- 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
	Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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