Heo Sa-Class Protected Cruiser [1890] (Seondok)

Heo Sa-Class, Seondok County Protected Cruiser laid down 1890

Displacement:
	6,792 t light; 7,075 t standard; 7,795 t normal; 8,371 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(433.07 ft / 426.51 ft) x 59.06 ft x (19.69 / 20.83 ft)
	(132.00 m / 130.00 m) x 18.00 m  x (6.00 / 6.35 m)

Armament:
      4 - 8.07" / 205 mm 35.0 cal guns - 242.51lbs / 110.00kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1885 Model
	  2 x Twin mounts on centreline, evenly spread
      4 - 6.10" / 155 mm 40.0 cal guns - 108.90lbs / 49.39kg shells, 150 per gun
	  Quick firing guns in casemate mounts, 1890 Model
	  4 x Single mounts on sides, evenly spread
      12 - 3.70" / 94.0 mm 35.0 cal guns - 23.76lbs / 10.78kg shells, 200 per gun
	  Quick firing guns in casemate mounts, 1890 Model
	  12 x Single mounts on sides, evenly spread
      4 - 2.13" / 54.0 mm 15.0 cal guns - 4.16lbs / 1.89kg shells, 500 per gun
	  Quick firing guns in deck mounts, 1887 Model
	  4 x Single mounts on sides, evenly spread
		4 raised mounts
      Weight of broadside 1,707 lbs / 774 kg
      Main Torpedoes
      4 - 19.7" / 500 mm, 9.84 ft / 3.00 m torpedoes - 0.304 t each, 1.218 t total
	In 4 sets of deck mounted carriage/fixed tubes
      2nd Torpedoes
      4 - 19.7" / 500 mm, 9.84 ft / 3.00 m torpedoes - 0.304 t each, 1.218 t total
	below water reloads

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Ends:	Unarmoured

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		0.98" / 25 mm	426.51 ft / 130.00 m	18.08 ft / 5.51 m
	Beam between torpedo bulkheads 55.77 ft / 17.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	7.87" / 200 mm	3.94" / 100 mm		7.09" / 180 mm
	2nd:	2.95" / 75 mm	0.98" / 25 mm		2.95" / 75 mm
	3rd:	0.98" / 25 mm	      -			      -

   - Protected deck - single deck:
	For and Aft decks: 1.97" / 50 mm
	Forecastle: 1.97" / 50 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 8.66" / 220 mm, Aft 4.72" / 120 mm

Machinery:
	Coal fired boilers, complex reciprocating steam engines,
	Direct drive, 2 shafts, 16,338 ihp / 12,188 Kw = 21.00 kts
	Range 5,000nm at 10.00 kts
	Bunker at max displacement = 1,297 tons (100% coal)

Complement:
	414 - 539

Cost:
	£0.760 million / $3.039 million

Distribution of weights at normal displacement:
	Armament: 276 tons, 3.5 %
	   - Guns: 272 tons, 3.5 %
	   - Weapons: 3 tons, 0.0 %
	Armour: 1,324 tons, 17.0 %
	   - Torpedo bulkhead: 281 tons, 3.6 %
	   - Armament: 284 tons, 3.6 %
	   - Armour Deck: 646 tons, 8.3 %
	   - Conning Towers: 113 tons, 1.5 %
	Machinery: 3,026 tons, 38.8 %
	Hull, fittings & equipment: 2,168 tons, 27.8 %
	Fuel, ammunition & stores: 1,003 tons, 12.9 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  4,841 lbs / 2,196 Kg = 18.4 x 8.1 " / 205 mm shells or 4.2 torpedoes
	Stability (Unstable if below 1.00): 1.61
	Metacentric height 5.0 ft / 1.5 m
	Roll period: 11.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 75 %
			- Recoil effect (Restricted arc if above 1.00): 0.23
	Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
	Hull has a flush deck,
	  a ram bow and a cruiser stern
	Block coefficient (normal/deep): 0.550 / 0.558
	Length to Beam Ratio: 7.22 : 1
	'Natural speed' for length: 20.65 kts
	Power going to wave formation at top speed: 48 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -15.00 degrees
	Stern overhang: -6.56 ft / -2.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	20.00 %,  17.22 ft / 5.25 m,  14.76 ft / 4.50 m
	   - Forward deck:	30.00 %,  14.76 ft / 4.50 m,  13.12 ft / 4.00 m
	   - Aft deck:	35.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
	   - Quarter deck:	15.00 %,  13.12 ft / 4.00 m,  13.12 ft / 4.00 m
	   - Average freeboard:		13.89 ft / 4.24 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 146.3 %
		- Above water (accommodation/working, high = better): 108.8 %
	Waterplane Area: 17,582 Square feet or 1,633 Square metres
	Displacement factor (Displacement / loading): 94 %
	Structure weight / hull surface area: 101 lbs/sq ft or 495 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.96
		- Longitudinal: 1.43
		- Overall: 1.00
	Cramped machinery, storage, compartmentation space
	Adequate accommodation and workspace room
	Ship has slow, easy roll, a good, steady gun platform
	Good seaboat, rides out heavy weather easily