1937 HMS Implacable

HMS Implacable, UK Battlecruiser laid down 1937

Displacement:
	33,478 t light; 35,000 t standard; 38,000 t normal; 40,400 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(888.00 ft / 870.00 ft) x 65.00 ft (Bulges 85.00 ft) x (31.00 / 32.99 ft)
	(270.66 m / 265.18 m) x 19.81 m (Bulges 25.91 m)  x (9.45 / 10.05 m)

Armament:
      6 - 14.00" / 356 mm 45.0 cal guns - 1,590.00lbs / 721.21kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1937 Model
	  3 x 2-gun mounts on centreline, forward evenly spread
		1 raised mount
      10 - 5.25" / 133 mm 50.0 cal guns - 80.01lbs / 36.29kg shells, 400 per gun
	  Dual purpose guns in deck and hoist mounts, 1935 Model
	  4 x Twin mounts on centreline, aft evenly spread
		2 raised mounts
	  1 x Twin mount on centreline, aft deck centre
		1 double raised mount
      32 - 1.57" / 40.0 mm 39.0 cal guns - 2.01lbs / 0.91kg shells, 1,500 per gun
	  Anti-air guns in deck mounts, 1930 Model
	  2 x 2 row octuple mounts on sides, forward deck aft
	  2 x 2 row octuple mounts on centreline ends, evenly spread
      Weight of broadside 10,404 lbs / 4,719 kg
      Main Torpedoes
      16 - 24.5" / 622 mm, 26.57 ft / 8.10 m torpedoes - 2.325 t each, 37.204 t total
	In 4 sets of deck mounted side rotating tubes
      2nd Torpedoes
      8 - 24.5" / 622 mm, 26.57 ft / 8.10 m torpedoes - 2.325 t each, 18.602 t total
	In 4 sets of deck mounted reloads

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	10.0" / 254 mm	606.00 ft / 184.71 m	7.00 ft / 2.13 m
	Ends:	Unarmoured
	Upper:	16.0" / 406 mm	606.00 ft / 184.71 m	9.00 ft / 2.74 m
	  Main Belt covers 107 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		1.75" / 44 mm	740.00 ft / 225.55 m	24.00 ft / 7.32 m
	Beam between torpedo bulkheads 52.00 ft / 15.85 m

   - Hull Bulges:
		0.75" / 19 mm	740.00 ft / 225.55 m	21.00 ft / 6.40 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	18.0" / 457 mm	7.00" / 178 mm		13.8" / 350 mm
	3rd:	2.00" / 51 mm	1.00" / 25 mm		2.00" / 51 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 5.00" / 127 mm
	Forecastle: 0.00" / 0 mm  Quarter deck: 6.00" / 152 mm

   - Conning towers: Forward 18.00" / 457 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 267,652 shp / 199,669 Kw = 37.00 kts
	Range 12,020nm at 14.00 kts
	Bunker at max displacement = 5,401 tons

Complement:
	1,360 - 1,769

Cost:
	£16.738 million / $66.952 million

Distribution of weights at normal displacement:
	Armament: 2,032 tons, 5.3 %
	   - Guns: 1,934 tons, 5.1 %
	   - Weapons: 98 tons, 0.3 %
	Armour: 12,649 tons, 33.3 %
	   - Belts: 5,179 tons, 13.6 %
	   - Torpedo bulkhead: 1,150 tons, 3.0 %
	   - Bulges: 431 tons, 1.2 %
	   - Armament: 1,807 tons, 4.8 %
	   - Armour Deck: 3,643 tons, 9.6 %
	   - Conning Tower: 438 tons, 1.2 %
	Machinery: 7,418 tons, 19.5 %
	Hull, fittings & equipment: 11,080 tons, 29.2 %
	Fuel, ammunition & stores: 4,522 tons, 11.9 %
	Miscellaneous weights: 300 tons, 0.8 %
	   - On freeboard deck: 250 tons
	   - Above deck: 50 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  38,030 lbs / 17,250 Kg = 27.7 x 14.0 " / 356 mm shells or 2.8 torpedoes
	Stability (Unstable if below 1.00): 1.04
	Metacentric height 2.8 ft / 0.9 m
	Roll period: 21.2 seconds
	Steadiness	- As gun platform (Average = 50 %): 44 %
			- Recoil effect (Restricted arc if above 1.00): 0.72
	Seaboat quality  (Average = 1.00): 0.78

Hull form characteristics:
	Hull has a flush deck,
	  a normal bow and large transom stern
	Block coefficient (normal/deep): 0.580 / 0.580
	Length to Beam Ratio: 10.24 : 1
	'Natural speed' for length: 33.32 kts
	Power going to wave formation at top speed: 57 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 10.00 degrees
	Stern overhang: 12.18 ft / 3.71 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	20.00 %,  33.00 ft / 10.06 m,  18.00 ft / 5.49 m
	   - Forward deck:	24.00 %,  18.00 ft / 5.49 m,  16.00 ft / 4.88 m
	   - Aft deck:	46.00 %,  16.00 ft / 4.88 m,  30.00 ft / 9.14 m
	   - Quarter deck:	10.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
	   - Average freeboard:		22.46 ft / 6.85 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 106.1 %
		- Above water (accommodation/working, high = better): 119.5 %
	Waterplane Area: 42,295 Square feet or 3,929 Square metres
	Displacement factor (Displacement / loading): 106 %
	Structure weight / hull surface area: 172 lbs/sq ft or 838 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 1.02
		- Longitudinal: 1.00
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Adequate accommodation and workspace room
	Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

14"/45 Mark VII
5.25"/50 QF Mark I
2-pdr/39 QF Mark VIII

External vertical main belt is 13ft in height and 185.5m long. Upper part 13ft in height is 406mm thick, Lower part, 2.5m in height, is 406-102mm (average 254mm) thick.

Turret faces are 457mm. Turret sides are 224mm, rears are 174mm, roof is 152mm. (average 174mm) Thickness of barbettes above armoured deck is 432mm at sides, 356mm to amidships, 406mm to ship ends. (average 406mm)

Inner longitudinal bulkhead is 44mm thick, underwater protection is 4.5m deep.

Ship has one cross-deck catapult, two heavy-duty cranes, and a seaplane hangar containing four seaplanes.