Jo Sung-Ma-Class Armored Cruiser [1903] (Seondok)

Jo Sung-Ma-Class, Seondok County Armored Cruiser laid down 1903

Displacement:
	11,276 t light; 12,000 t standard; 12,794 t normal; 13,429 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(498.69 ft / 492.13 ft) x 72.18 ft x (26.25 / 27.20 ft)
	(152.00 m / 150.00 m) x 22.00 m  x (8.00 / 8.29 m)

Armament:
      4 - 7.87" / 200 mm 50.0 cal guns - 258.41lbs / 117.21kg shells, 175 per gun
	  Breech loading guns in turret on barbette mounts, 1900 Model
	  2 x Twin mounts on centreline, evenly spread
      8 - 7.87" / 200 mm 50.0 cal guns - 258.41lbs / 117.21kg shells, 175 per gun
	  Breech loading guns in casemate mounts, 1900 Model
	  8 x Single mounts on sides, evenly spread
      8 - 5.71" / 145 mm 45.0 cal guns - 93.81lbs / 42.55kg shells, 250 per gun
	  Quick firing guns in casemate mounts, 1898 Model
	  8 x Single mounts on sides, evenly spread
      14 - 3.44" / 87.5 mm 40.0 cal guns - 19.59lbs / 8.89kg shells, 400 per gun
	  Quick firing guns in deck mounts, 1894 Model
	  14 x Single mounts on sides, evenly spread
		14 raised mounts
      16 - 0.98" / 25.0 mm 55.0 cal guns - 0.51lbs / 0.23kg shells, 500 per gun
	  Quick firing guns in deck mounts, 1901 Model
	  16 x Single mounts on centreline, evenly spread
		16 double raised mounts
      Weight of broadside 4,134 lbs / 1,875 kg
      Main Torpedoes
      4 - 21.7" / 550 mm, 32.81 ft / 10.00 m torpedoes - 1.831 t each, 7.322 t total
	In 4 sets of deck mounted carriage/fixed tubes
      2nd Torpedoes
      4 - 21.7" / 550 mm, 32.81 ft / 10.00 m torpedoes - 1.831 t each, 7.322 t total
	In 1 sets of deck mounted carriage/fixed tubes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	7.87" / 200 mm	393.70 ft / 120.00 m	10.20 ft / 3.11 m
	Ends:	3.94" / 100 mm	  98.39 ft / 29.99 m	10.20 ft / 3.11 m
	Upper:	5.91" / 150 mm	393.70 ft / 120.00 m	8.01 ft / 2.44 m
	  Main Belt covers 123 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		1.97" / 50 mm	393.70 ft / 120.00 m	22.54 ft / 6.87 m
	Beam between torpedo bulkheads 59.06 ft / 18.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	7.87" / 200 mm	5.91" / 150 mm		8.86" / 225 mm
	2nd:	5.91" / 150 mm	3.94" / 100 mm		5.91" / 150 mm
	3rd:	2.95" / 75 mm	0.98" / 25 mm		2.95" / 75 mm
	4th:	2.95" / 75 mm	0.98" / 25 mm		      -

   - Armoured deck - multiple decks:
	For and Aft decks: 1.97" / 50 mm
	Forecastle: 1.97" / 50 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 7.87" / 200 mm, Aft 0.00" / 0 mm

Machinery:
	Coal fired boilers, complex reciprocating steam engines,
	Direct drive, 2 shafts, 20,774 ihp / 15,498 Kw = 21.00 kts
	Range 5,000nm at 10.00 kts
	Bunker at max displacement = 1,428 tons (100% coal)

Complement:
	600 - 781

Cost:
	£1.093 million / $4.371 million

Distribution of weights at normal displacement:
	Armament: 786 tons, 6.1 %
	   - Guns: 767 tons, 6.0 %
	   - Weapons: 18 tons, 0.1 %
	Armour: 4,491 tons, 35.1 %
	   - Belts: 2,201 tons, 17.2 %
	   - Torpedo bulkhead: 646 tons, 5.1 %
	   - Armament: 697 tons, 5.4 %
	   - Armour Deck: 854 tons, 6.7 %
	   - Conning Tower: 93 tons, 0.7 %
	Machinery: 3,101 tons, 24.2 %
	Hull, fittings & equipment: 2,798 tons, 21.9 %
	Fuel, ammunition & stores: 1,518 tons, 11.9 %
	Miscellaneous weights: 100 tons, 0.8 %
	   - Above deck: 100 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  13,698 lbs / 6,213 Kg = 56.1 x 7.9 " / 200 mm shells or 1.6 torpedoes
	Stability (Unstable if below 1.00): 1.43
	Metacentric height 5.7 ft / 1.7 m
	Roll period: 12.7 seconds
	Steadiness	- As gun platform (Average = 50 %): 83 %
			- Recoil effect (Restricted arc if above 1.00): 0.30
	Seaboat quality  (Average = 1.00): 1.66

Hull form characteristics:
	Hull has a flush deck,
	  a ram bow and a cruiser stern
	Block coefficient (normal/deep): 0.480 / 0.486
	Length to Beam Ratio: 6.82 : 1
	'Natural speed' for length: 22.18 kts
	Power going to wave formation at top speed: 44 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -4.00 degrees
	Stern overhang: -6.56 ft / -2.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	10.00 %,  19.69 ft / 6.00 m,  18.04 ft / 5.50 m
	   - Forward deck:	30.00 %,  18.04 ft / 5.50 m,  14.76 ft / 4.50 m
	   - Aft deck:	50.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
	   - Quarter deck:	10.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
	   - Average freeboard:		15.65 ft / 4.77 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 122.3 %
		- Above water (accommodation/working, high = better): 111.2 %
	Waterplane Area: 23,252 Square feet or 2,160 Square metres
	Displacement factor (Displacement / loading): 96 %
	Structure weight / hull surface area: 112 lbs/sq ft or 549 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.67
		- Overall: 1.00
	Cramped machinery, storage, compartmentation space
	Adequate 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