CRNS Iridia - Heavy Cruiser 1920

CRNS Iridia, Calder Republic Heavy Cruiser laid down 1920 (Engine 1921)

Displacement:
	9,893 t light; 10,278 t standard; 10,822 t normal; 11,257 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(579.82 ft / 570.87 ft) x 56.43 ft x (21.65 / 22.31 ft)
	(176.73 m / 174.00 m) x 17.20 m  x (6.60 / 6.80 m)

Armament:
      8 - 8.07" / 205 mm 50.0 cal guns - 278.28lbs / 126.22kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1917 Model
	  4 x Twin mounts on centreline, evenly spread
		2 raised mounts
      4 - 3.94" / 100 mm 50.0 cal guns - 30.77lbs / 13.96kg shells, 300 per gun
	  Quick firing guns in deck and hoist mounts, 1915 Model
	  4 x Single mounts on sides, evenly spread
      8 - 2.95" / 75.0 mm 50.0 cal guns - 13.63lbs / 6.18kg shells, 400 per gun
	  Breech loading guns in deck mounts, 1914 Model
	  8 x Single mounts on sides, evenly spread
      4 - 0.50" / 12.7 mm 60.0 cal guns - 0.07lbs / 0.03kg shells, 600 per gun
	  Machine guns in deck mounts, 1912 Model
	  4 x Single mounts on side ends, evenly spread
      Weight of broadside 2,459 lbs / 1,115 kg
      Main Torpedoes
      8 - 21.0" / 533 mm, 23.10 ft / 7.04 m torpedoes - 1.486 t each, 11.888 t total
	In 2 sets of deck mounted side rotating tubes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	4.53" / 115 mm	366.11 ft / 111.59 m	9.02 ft / 2.75 m
	Ends:	1.57" / 40 mm	204.76 ft / 62.41 m	9.02 ft / 2.75 m
	  Main Belt covers 99 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	0.98" / 25 mm	0.98" / 25 mm		0.98" / 25 mm

   - Box over machinery & magazines:
	3.94" / 100 mm
	Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 4.72" / 120 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Direct drive, 4 shafts, 74,841 shp / 55,831 Kw = 31.50 kts
	Range 8,000nm at 10.00 kts
	Bunker at max displacement = 979 tons

Complement:
	529 - 689

Cost:
	£2.267 million / $9.068 million

Distribution of weights at normal displacement:
	Armament: 638 tons, 5.9 %
	   - Guns: 615 tons, 5.7 %
	   - Weapons: 24 tons, 0.2 %
	Armour: 2,577 tons, 23.8 %
	   - Belts: 725 tons, 6.7 %
	   - Armament: 121 tons, 1.1 %
	   - Armour Deck: 1,682 tons, 15.5 %
	   - Conning Tower: 50 tons, 0.5 %
	Machinery: 2,577 tons, 23.8 %
	Hull, fittings & equipment: 4,100 tons, 37.9 %
	Fuel, ammunition & stores: 929 tons, 8.6 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  13,927 lbs / 6,317 Kg = 53.0 x 8.1 " / 205 mm shells or 1.4 torpedoes
	Stability (Unstable if below 1.00): 1.10
	Metacentric height 2.5 ft / 0.8 m
	Roll period: 14.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 56 %
			- Recoil effect (Restricted arc if above 1.00): 0.98
	Seaboat quality  (Average = 1.00): 1.44

Hull form characteristics:
	Hull has rise forward of midbreak,
	  a normal bow and large transom stern
	Block coefficient (normal/deep): 0.543 / 0.548
	Length to Beam Ratio: 10.12 : 1
	'Natural speed' for length: 27.11 kts
	Power going to wave formation at top speed: 58 %
	Trim (Max stability = 0, Max steadiness = 100): 39
	Bow angle (Positive = bow angles forward): 18.00 degrees
	Stern overhang: -3.28 ft / -1.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	21.00 %,  27.56 ft / 8.40 m,  24.93 ft / 7.60 m
	   - Forward deck:	36.00 %,  24.93 ft / 7.60 m,  24.93 ft / 7.60 m
	   - Aft deck:	25.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
	   - Quarter deck:	18.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
	   - Average freeboard:		23.46 ft / 7.15 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 98.7 %
		- Above water (accommodation/working, high = better): 190.4 %
	Waterplane Area: 23,249 Square feet or 2,160 Square metres
	Displacement factor (Displacement / loading): 107 %
	Structure weight / hull surface area: 104 lbs/sq ft or 507 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.90
		- Longitudinal: 2.47
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Good seaboat, rides out heavy weather easily