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Saturday, January 15, 2005

Frank Fox had argued for a armament of 8-12in guns

I just tried out an 8-12in gunned GB/CB/1905 with a 6in belt. The best speed I could get was 28 knots. The size is 35,293, normal displacement. By adjusting dimensions, I could probably do better. Hull strength is the issue. I am sure that my friend Cliff would really enjoy trying out Springsharp.
GB/CB/1905 design study C1, Great Britain Battlecruiser laid down 1905

Displacement:
	29,611 t light; 30,692 t standard; 35,293 t normal; 38,973 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:
      8 - 12.00" / 305 mm guns (3 mounts), 864.00lbs / 391.90kg shells, 1905 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
	  Main guns limited to end-on fire
      12 - 6.00" / 152 mm guns (9 mounts), 108.00lbs / 48.99kg shells, 1905 Model
	  Quick firing guns in deck mounts 
	  on side, evenly spread, all raised mounts
	Weight of broadside 8,208 lbs / 3,723 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, 107,644 shp / 80,303 Kw = 28.00 kts
	Range 7,500nm at 15.00 kts
	Bunker at max displacement = 8,282 tons

Complement:
	1,286 - 1,673

Cost:
	£3.040 million / $12.160 million

Distribution of weights at normal displacement:
	Armament: 1,026 tons, 2.9 %
	Armour: 7,132 tons, 20.2 %
	   - Belts: 2,032 tons, 5.8 %
	   - Torpedo bulkhead: 638 tons, 1.8 %
	   - Armament: 2,038 tons, 5.8 %
	   - Armour Deck: 2,424 tons, 6.9 %
	   - Conning Tower: 0 tons, 0.0 %
	Machinery: 8,155 tons, 23.1 %
	Hull, fittings & equipment: 13,299 tons, 37.7 %
	Fuel, ammunition & stores: 5,681 tons, 16.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  44,112 lbs / 20,009 Kg = 51.1 x 12.0 " / 305 mm shells or 4.4 torpedoes
	Stability (Unstable if below 1.00): 1.11
	Metacentric height 4.8 ft / 1.5 m
	Roll period: 16.3 seconds
	Steadiness	- As gun platform (Average = 50 %): 86 %
			- Recoil effect (Restricted arc if above 1.00): 1.16
	Seaboat quality  (Average = 1.00): 1.72

Hull form characteristics:
	Hull has raised forecastle, rise forward of midbreak
	Block coefficient: 0.699
	Length to Beam Ratio: 9.06 : 1
	'Natural speed' for length: 27.75 kts
	Power going to wave formation at top speed: 49 %
	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): 126.6 %
		- Above water (accommodation/working, high = better): 237.3 %
	Waterplane Area: 52,413 Square feet or 4,869 Square metres
	Displacement factor (Displacement / loading): 112 %
	Structure weight / hull surface area: 163 lbs/sq ft or 794 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.42
		- 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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