1929 HMS Implacable

HMS Implacable, Britain Large Armoured Ram laid down 1929

Displacement:
	25,186 t light; 25,996 t standard; 27,291 t normal; 28,327 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(1,017.06 ft / 984.25 ft) x 65.62 ft x (30.18 / 31.03 ft)
	(310.00 m / 300.00 m) x 20.00 m  x (9.20 / 9.46 m)

Armament:
      22 - 5.98" / 152 mm 45.0 cal guns - 108.07lbs / 49.02kg shells, 150 per gun
	  Dual purpose guns in deck and hoist mounts, 1929 Model
	  11 x 2-gun mounts on centreline, evenly spread
		4 raised mounts
      80 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 750 per gun
	  Anti-air guns in deck mounts, 1929 Model
	  10 x 2 row octuple mounts on sides, evenly spread
		4 raised mounts
      Weight of broadside 2,535 lbs / 1,150 kg
      Main Torpedoes
      64 - 21.0" / 533 mm, 26.25 ft / 8.00 m torpedoes - 1.730 t each, 110.720 t total
	In 16 sets of deck mounted side rotating tubes
      2nd Torpedoes
      8 - 21.0" / 533 mm, 26.25 ft / 8.00 m torpedoes - 1.730 t each, 13.840 t total
	submerged bow tubes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	5.98" / 152 mm	925.20 ft / 282.00 m	9.48 ft / 2.89 m
	Ends:	Unarmoured
	  Main Belt covers 145 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		2.99" / 76 mm	984.25 ft / 300.00 m	25.98 ft / 7.92 m
	Beam between torpedo bulkheads 59.06 ft / 18.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	5.98" / 152 mm	2.01" / 51 mm		4.02" / 102 mm

   - Armoured deck - single deck:
	For and Aft decks: 2.99" / 76 mm

   - Conning towers: Forward 7.99" / 203 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 6 shafts, 329,274 shp / 245,639 Kw = 41.00 kts
	Range 5,500nm at 14.00 kts
	Bunker at max displacement = 2,331 tons

Complement:
	1,061 - 1,380

Cost:
	£10.127 million / $40.510 million

Distribution of weights at normal displacement:
	Armament: 963 tons, 3.5 %
	   - Guns: 714 tons, 2.6 %
	   - Weapons: 249 tons, 0.9 %
	Armour: 7,080 tons, 25.9 %
	   - Belts: 1,995 tons, 7.3 %
	   - Torpedo bulkhead: 2,831 tons, 10.4 %
	   - Armament: 270 tons, 1.0 %
	   - Armour Deck: 1,827 tons, 6.7 %
	   - Conning Tower: 156 tons, 0.6 %
	Machinery: 10,113 tons, 37.1 %
	Hull, fittings & equipment: 6,761 tons, 24.8 %
	Fuel, ammunition & stores: 2,105 tons, 7.7 %
	Miscellaneous weights: 270 tons, 1.0 %
	   - On freeboard deck: 150 tons
	   - Above deck: 120 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  17,483 lbs / 7,930 Kg = 163.2 x 6.0 " / 152 mm shells or 1.5 torpedoes
	Stability (Unstable if below 1.00): 1.14
	Metacentric height 3.4 ft / 1.0 m
	Roll period: 14.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 65 %
			- Recoil effect (Restricted arc if above 1.00): 0.46
	Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
	Hull has a flush deck,
	  a ram bow and a cruiser stern
	Block coefficient (normal/deep): 0.490 / 0.495
	Length to Beam Ratio: 15.00 : 1
	'Natural speed' for length: 31.37 kts
	Power going to wave formation at top speed: 50 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -30.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	20.00 %,  34.51 ft / 10.52 m,  28.25 ft / 8.61 m
	   - Forward deck:	20.00 %,  28.25 ft / 8.61 m,  21.95 ft / 6.69 m
	   - Aft deck:	40.00 %,  21.95 ft / 6.69 m,  21.95 ft / 6.69 m
	   - Quarter deck:	20.00 %,  21.95 ft / 6.69 m,  21.95 ft / 6.69 m
	   - Average freeboard:		24.34 ft / 7.42 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 144.5 %
		- Above water (accommodation/working, high = better): 173.1 %
	Waterplane Area: 42,643 Square feet or 3,962 Square metres
	Displacement factor (Displacement / loading): 92 %
	Structure weight / hull surface area: 126 lbs/sq ft or 616 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 1.05
		- Longitudinal: 0.99
		- Overall: 1.00
	Cramped machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Good seaboat, rides out heavy weather easily