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Saturday, January 15, 2005

By trimming armor, I got my 1927 fast battleship (GB/BB/1927) to work

I had to trim armor and balloon displacement, but I was able to get 32 knots from my Vanguard-like design. It is like a Hood with better deck and side protection. The armor deck is 5in while the belt is 13in. I am pleased, as I had envisioned the full load displacement as 45,500 tons, anyway. I am trying to keep dimensions and speed, and make other compromises to achieve them, while having a good seaboat.
GB/BB/1927, Great Britain Battleship laid down 1927

Displacement:
	42,433 t light; 44,100 t standard; 46,570 t normal; 48,545 t full load

Dimensions: Length overall / water x beam x draught
	801.15 ft / 800.00 ft x 108.00 ft x 35.00 ft (normal load)
	244.19 m / 243.84 m x 32.92 m  x 10.67 m

Armament:
      8 - 15.00" / 381 mm guns (4x2 guns), 1,687.50lbs / 765.44kg shells, 1927 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      16 - 5.00" / 127 mm guns (8x2 guns), 62.50lbs / 28.35kg shells, 1927 Model
	  Quick firing guns in deck mounts with hoists
	  on side, evenly spread, 4 raised mounts
	Weight of broadside 14,500 lbs / 6,577 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.0" / 330 mm	475.00 ft / 144.78 m	17.00 ft / 5.18 m
	Ends:	6.00" / 152 mm	240.00 ft / 73.15 m	16.00 ft / 4.88 m
	  85.00 ft / 25.91 m Unarmoured ends
	  Main Belt covers 91 % of normal length

   - Torpedo Bulkhead:
		2.00" / 51 mm	475.00 ft / 144.78 m	27.00 ft / 8.23 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	13.0" / 330 mm	8.00" / 203 mm		13.0" / 330 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 5.00" / 127 mm, Conning tower: 9.00" / 229 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 175,507 shp / 130,928 Kw = 32.00 kts
	Range 7,500nm at 15.00 kts
	Bunker at max displacement = 4,446 tons

Complement:
	1,584 - 2,060

Cost:
	£13.757 million / $55.029 million

Distribution of weights at normal displacement:
	Armament: 1,813 tons, 3.9 %
	Armour: 16,426 tons, 35.3 %
	   - Belts: 5,441 tons, 11.7 %
	   - Torpedo bulkhead: 949 tons, 2.0 %
	   - Armament: 4,039 tons, 8.7 %
	   - Armour Deck: 5,746 tons, 12.3 %
	   - Conning Tower: 251 tons, 0.5 %
	Machinery: 5,540 tons, 11.9 %
	Hull, fittings & equipment: 18,655 tons, 40.1 %
	Fuel, ammunition & stores: 4,136 tons, 8.9 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  68,956 lbs / 31,278 Kg = 40.9 x 15.0 " / 381 mm shells or 10.0 torpedoes
	Stability (Unstable if below 1.00): 1.00
	Metacentric height 5.6 ft / 1.7 m
	Roll period: 19.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 54 %
			- Recoil effect (Restricted arc if above 1.00): 0.72
	Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
	Hull has a flush deck
	  and transom stern
	Block coefficient: 0.539
	Length to Beam Ratio: 7.41 : 1
	'Natural speed' for length: 32.93 kts
	Power going to wave formation at top speed: 55 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		33.00 ft / 10.06 m
	   - Forecastle (20 %):	28.00 ft / 8.53 m
	   - Mid (0 %):		27.00 ft / 8.23 m
	   - Quarterdeck (15 %):	27.00 ft / 8.23 m
	   - Stern:		27.00 ft / 8.23 m
	   - Average freeboard:	27.50 ft / 8.38 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 83.8 %
		- Above water (accommodation/working, high = better): 200.5 %
	Waterplane Area: 62,117 Square feet or 5,771 Square metres
	Displacement factor (Displacement / loading): 111 %
	Structure weight / hull surface area: 209 lbs/sq ft or 1,019 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.50
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent

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