Cora class frigate

Cora, Antaran heavy frigate laid down 1941

Displacement:
	1?133 t light; 1?203 t standard; 1?467 t normal; 1?679 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(333.12 ft / 331.36 ft) x 39.37 ft x (13.12 / 14.07 ft)
	(101.53 m / 101.00 m) x 12.00 m  x (4.00 / 4.29 m)

Armament:
      4 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 180 per gun
	  Dual purpose guns in deck mounts, 1941 Model
	  1 x Twin mount on centreline, forward deck forward
	  1 x Twin mount on centreline, aft deck aft
      6 - 1.57" / 40.0 mm 70.0 cal guns - 2.19lbs / 0.99kg shells, 2?000 per gun
	  Anti-air guns in deck mounts, 1941 Model
	  2 x Triple mounts on centreline, evenly spread
      Weight of broadside 265 lbs / 120 kg
      Main Torpedoes
      3 - 24.0" / 610 mm, 26.25 ft / 8.00 m torpedoes - 2.234 t each, 6.703 t total
	In 1 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	1.97" / 50 mm	0.98" / 25 mm		      -
	2nd:	0.98" / 25 mm	      -			      -

   - Box over machinery & magazines:
	0.91" / 23 mm

   - Conning towers: Forward 2.99" / 76 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Electric cruising motors plus geared drives, 2 shafts, 10?151 shp / 7?573 Kw = 25.00 kts
	Range 8?000nm at 14.00 kts
	Bunker at max displacement = 477 tons

Complement:
	118 - 154

Cost:
	￡0.560 million / $2.238 million

Distribution of weights at normal displacement:
	Armament: 57 tons, 3.9%
	   - Guns: 43 tons, 2.9%
	   - Weapons: 13 tons, 0.9%
	Armour: 158 tons, 10.8%
	   - Armament: 17 tons, 1.1%
	   - Armour Deck: 133 tons, 9.1%
	   - Conning Tower: 8 tons, 0.6%
	Machinery: 268 tons, 18.3%
	Hull, fittings & equipment: 649 tons, 44.2%
	Fuel, ammunition & stores: 334 tons, 22.8%
	Miscellaneous weights: 7 tons, 0.5%
	   - On freeboard deck: 7 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  2?867 lbs / 1?301 Kg = 45.9 x 5.0 " / 127 mm shells or 0.7 torpedoes
	Stability (Unstable if below 1.00): 1.00
	Metacentric height 1.2 ft / 0.4 m
	Roll period: 14.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 100 %
			- Recoil effect (Restricted arc if above 1.00): 0.21
	Seaboat quality  (Average = 1.00): 1.55

Hull form characteristics:
	Hull has a flush deck,
	  a normal bow and small transom stern
	Block coefficient (normal/deep): 0.300 / 0.320
	Length to Beam Ratio: 8.42 : 1
	'Natural speed' for length: 20.10 kts
	Power going to wave formation at top speed: 50 %
	Trim (Max stability = 0, Max steadiness = 100): 91
	Bow angle (Positive = bow angles forward): 5.00 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%,  20.01 ft / 6.10 m,  14.76 ft / 4.50 m
	   - Forward deck:	30.00%,  14.76 ft / 4.50 m,  11.15 ft / 3.40 m
	   - Aft deck:	32.00%,  11.15 ft / 3.40 m,  9.84 ft / 3.00 m
	   - Quarter deck:	18.00%,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
	   - Average freeboard:		12.39 ft / 3.78 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 70.7%
		- Above water (accommodation/working, high = better): 127.9%
	Waterplane Area: 7?846 Square feet or 729 Square metres
	Displacement factor (Displacement / loading): 177%
	Structure weight / hull surface area: 55 lbs/sq ft or 270 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.91
		- Longitudinal: 2.29
		- Overall: 1.00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Ship has slow, easy roll, a good, steady gun platform
	Excellent seaboat, comfortable, can fire her guns in the heaviest weather