1931 ROCN Rui Hai

Ruì Hǎi (瑞海), Republic of China Navy Heavy Cruiser laid down 1931

Displacement:
	8,077 t light; 8,480 t standard; 9,580 t normal; 10,460 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(618.48 ft / 606.96 ft) x 59.06 ft x (20.34 / 21.65 ft)
	(188.51 m / 185.00 m) x 18.00 m  x (6.20 / 6.60 m)

Armament:
      8 - 7.99" / 203 mm 55.0 cal guns - 260.00lbs / 117.93kg shells, 100 per gun
	  Breech loading guns in deck and hoist mounts, 1933 Model
	  2 x 2-gun mounts on centreline, aft evenly spread
		1 raised mount aft
	  2 x 2-gun mounts on centreline, forward evenly spread
		1 raised mount
      8 - 5.00" / 127 mm 25.0 cal guns - 54.00lbs / 24.49kg shells, 300 per gun
	  Anti-air guns in deck mounts, 1921 Model
	  8 x Single mounts on sides, evenly spread
      16 - 1.10" / 28.0 mm 75.0 cal guns - 0.93lbs / 0.42kg shells, 3,000 per gun
	  Anti-air guns in deck mounts, 1929 Model
	  6 x Twin mounts on sides, evenly spread
		6 raised mounts
	  2 x Twin mounts on centreline, evenly spread
		2 raised mounts
      Weight of broadside 2,527 lbs / 1,146 kg
      Main Torpedoes
      4 - 21.0" / 533 mm, 22.58 ft / 6.88 m torpedoes - 1.498 t each, 5.990 t total
	In 1 sets of deck mounted centre rotating tubes
      2nd Torpedoes
      8 - 21.0" / 533 mm, 22.58 ft / 6.88 m torpedoes - 1.498 t each, 11.981 t total
	In 2 sets of deck mounted reloads

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	4.13" / 105 mm	394.52 ft / 120.25 m	11.15 ft / 3.40 m
	Ends:	Unarmoured
	  Main Belt covers 100 % of normal length
	  Main Belt inclined -10.00 degrees (positive = in)

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		1.97" / 50 mm	394.52 ft / 120.25 m	20.34 ft / 6.20 m
	Beam between torpedo bulkheads 55.77 ft / 17.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	7.99" / 203 mm	0.98" / 25 mm		2.95" / 75 mm
	2nd:	0.98" / 25 mm	0.24" / 6 mm		      -

   - Armoured deck - multiple decks:
	For and Aft decks: 2.56" / 65 mm

   - Conning towers: Forward 2.01" / 51 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 67,330 shp / 50,228 Kw = 31.25 kts
	Range 10,000nm at 14.00 kts
	Bunker at max displacement = 1,979 tons

Complement:
	483 - 629

Cost:
	£3.626 million / $14.504 million

Distribution of weights at normal displacement:
	Armament: 781 tons, 8.1 %
	   - Guns: 754 tons, 7.9 %
	   - Weapons: 27 tons, 0.3 %
	Armour: 2,366 tons, 24.7 %
	   - Belts: 743 tons, 7.8 %
	   - Torpedo bulkhead: 585 tons, 6.1 %
	   - Armament: 102 tons, 1.1 %
	   - Armour Deck: 916 tons, 9.6 %
	   - Conning Tower: 20 tons, 0.2 %
	Machinery: 2,013 tons, 21.0 %
	Hull, fittings & equipment: 2,802 tons, 29.2 %
	Fuel, ammunition & stores: 1,503 tons, 15.7 %
	Miscellaneous weights: 115 tons, 1.2 %
	   - On freeboard deck: 70 tons
	   - Above deck: 45 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  11,401 lbs / 5,171 Kg = 44.7 x 8.0 " / 203 mm shells or 1.7 torpedoes
	Stability (Unstable if below 1.00): 1.22
	Metacentric height 3.3 ft / 1.0 m
	Roll period: 13.7 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.53
	Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
	Hull has a flush deck,
	  a normal bow and small transom stern
	Block coefficient (normal/deep): 0.460 / 0.472
	Length to Beam Ratio: 10.28 : 1
	'Natural speed' for length: 26.47 kts
	Power going to wave formation at top speed: 52 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 20.00 degrees
	Stern overhang: 3.28 ft / 1.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	20.00 %,  22.64 ft / 6.90 m,  14.76 ft / 4.50 m
	   - Forward deck:	30.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
	   - Aft deck:	35.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
	   - Quarter deck:	15.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
	   - Average freeboard:		15.39 ft / 4.69 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 99.6 %
		- Above water (accommodation/working, high = better): 125.5 %
	Waterplane Area: 23,591 Square feet or 2,192 Square metres
	Displacement factor (Displacement / loading): 106 %
	Structure weight / hull surface area: 107 lbs/sq ft or 524 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.99
		- Longitudinal: 1.08
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room

8480 ton cruiser

Aviation facilities:
20t above deck, rotating GP catapult
25t above deck, heavy crane
40t on deck, two Vought O3U-1 floatplanes
30t on deck, one floatplane hangar

Armament:
Main Battery: 8"/55 Mark 9
Secondary Battery: 5"/25 Mark 13
Anti-Aircraft Battery: 1.1"/75 Mark 2
Torpedoes: 21" Mark 12