Chojun-Seo-Class Armored Corvette [1870] (Seondok)

Chojun-Seo-Class, Seondok County Armored Corvette laid down 1870
Armoured Corvette (Central battery ironclad)

Displacement:
	2,401 t light; 2,550 t standard; 2,791 t normal; 2,984 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(308.40 ft / 295.28 ft) x 45.93 ft x (13.12 / 13.84 ft)
	(94.00 m / 90.00 m) x 14.00 m  x (4.00 / 4.22 m)

Armament:
      6 - 9.84" / 250 mm 15.0 cal guns - 352.74lbs / 160.00kg shells, 70 per gun
	  Breech loading guns in broadside mounts, 1870 Model
	  6 x Single mounts on sides, evenly spread
      12 - 3.15" / 80.0 mm 21.0 cal guns - 11.02lbs / 5.00kg shells, 150 per gun
	  Breech loading guns in broadside mounts, 1866 Model
	  12 x Single mounts on sides, evenly spread
      40 - 0.24" / 6.0 mm 200.0 cal guns - 0.01lbs / 0.00kg shells, 150 per gun
	  Muzzle loading guns in deck mounts, 1870 Model
	  4 x 2 row decuple mounts on sides, evenly spread
      Weight of broadside 2,249 lbs / 1,020 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	9.84" / 250 mm	118.11 ft / 36.00 m	8.14 ft / 2.48 m
	Ends:	2.17" / 55 mm	177.13 ft / 53.99 m	8.14 ft / 2.48 m
	  Main Belt covers 62 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		0.79" / 20 mm	118.11 ft / 36.00 m	12.04 ft / 3.67 m
	Beam between torpedo bulkheads 45.93 ft / 14.00 m

Machinery:
	Coal fired boilers, simple reciprocating steam engines,
	Direct drive, 2 shafts, 1,473 ihp / 1,099 Kw = 12.00 kts
	Range 1,000nm at 12.00 kts
	Bunker at max displacement = 434 tons (100% coal)

Complement:
	191 - 249

Cost:
	£0.172 million / $0.690 million

Distribution of weights at normal displacement:
	Armament: 105 tons, 3.8 %
	   - Guns: 105 tons, 3.8 %
	Armour: 622 tons, 22.3 %
	   - Belts: 581 tons, 20.8 %
	   - Torpedo bulkhead: 41 tons, 1.5 %
	Machinery: 361 tons, 12.9 %
	Hull, fittings & equipment: 1,313 tons, 47.0 %
	Fuel, ammunition & stores: 390 tons, 14.0 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  4,431 lbs / 2,010 Kg = 13.3 x 9.8 " / 250 mm shells or 1.8 torpedoes
	Stability (Unstable if below 1.00): 1.48
	Metacentric height 3.0 ft / 0.9 m
	Roll period: 11.1 seconds
	Steadiness	- As gun platform (Average = 50 %): 89 %
			- Recoil effect (Restricted arc if above 1.00): 0.57
	Seaboat quality  (Average = 1.00): 1.78

Hull form characteristics:
	Hull has a flush deck,
	  a ram bow and a cruiser stern
	Block coefficient (normal/deep): 0.549 / 0.556
	Length to Beam Ratio: 6.43 : 1
	'Natural speed' for length: 17.18 kts
	Power going to wave formation at top speed: 30 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -8.00 degrees
	Stern overhang: -3.28 ft / -1.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	30.00 %,  14.76 ft / 4.50 m,  13.12 ft / 4.00 m
	   - Forward deck:	30.00 %,  13.12 ft / 4.00 m,  11.48 ft / 3.50 m
	   - Aft deck:	10.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
	   - Quarter deck:	30.00 %,  11.48 ft / 3.50 m,  11.48 ft / 3.50 m
	   - Average freeboard:		12.42 ft / 3.79 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 58.0 %
		- Above water (accommodation/working, high = better): 114.1 %
	Waterplane Area: 9,456 Square feet or 879 Square metres
	Displacement factor (Displacement / loading): 164 %
	Structure weight / hull surface area: 103 lbs/sq ft or 502 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.92
		- Longitudinal: 2.01
		- Overall: 1.00
	Excellent 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