Baekdong-Class Battleship [1888] (Seondok)

Baekdong-Class, Seondok County Ironclad Battleship laid down 1888

Displacement:
	9,230 t light; 9,750 t standard; 10,648 t normal; 11,366 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(334.65 ft / 328.08 ft) x 78.74 ft x (26.25 / 27.64 ft)
	(102.00 m / 100.00 m) x 24.00 m  x (8.00 / 8.43 m)

Armament:
      4 - 12.20" / 310 mm 38.0 cal guns - 843.27lbs / 382.50kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1886 Model
	  2 x Twin mounts on centreline, evenly spread
      10 - 6.10" / 155 mm 35.0 cal guns - 110.23lbs / 50.00kg shells, 120 per gun
	  Quick firing guns in casemate mounts, 1887 Model
	  10 x Single mounts on sides, evenly spread
      12 - 4.33" / 110 mm 35.0 cal guns - 35.72lbs / 16.20kg shells, 150 per gun
	  Quick firing guns in casemate mounts, 1882 Model
	  12 x Single mounts on sides, evenly spread
      16 - 2.00" / 50.8 mm 35.0 cal guns - 3.00lbs / 1.36kg shells, 400 per gun
	  Quick firing guns in deck mounts, 1886 Model
	  16 x Single mounts on sides, evenly spread
      Weight of broadside 4,952 lbs / 2,246 kg
      Main Torpedoes
      4 - 17.7" / 450 mm, 13.12 ft / 4.00 m torpedoes - 0.306 t each, 1.224 t total
	submerged bow & stern tubes
      2nd Torpedoes
      8 - 17.7" / 450 mm, 13.12 ft / 4.00 m torpedoes - 0.306 t each, 2.447 t total
	below water reloads

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.8" / 350 mm	196.85 ft / 60.00 m	10.66 ft / 3.25 m
	Ends:	1.97" / 50 mm	131.20 ft / 39.99 m	10.66 ft / 3.25 m
	Upper:	5.91" / 150 mm	196.85 ft / 60.00 m	8.01 ft / 2.44 m
	  Main Belt covers 92 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		1.97" / 50 mm	196.85 ft / 60.00 m	24.08 ft / 7.34 m
	Beam between torpedo bulkheads 65.62 ft / 20.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	11.0" / 280 mm	9.84" / 250 mm		13.0" / 330 mm
	2nd:	3.94" / 100 mm	1.97" / 50 mm		4.92" / 125 mm
	3rd:	1.97" / 50 mm	0.98" / 25 mm		1.97" / 50 mm
	4th:	0.49" / 13 mm	      -			      -

   - Armoured deck - multiple decks:
	For and Aft decks: 1.97" / 50 mm
	Forecastle: 1.57" / 40 mm  Quarter deck: 1.57" / 40 mm

   - Conning towers: Forward 11.81" / 300 mm, Aft 0.00" / 0 mm

Machinery:
	Coal fired boilers, complex reciprocating steam engines,
	Direct drive, 2 shafts, 8,062 ihp / 6,014 Kw = 16.00 kts
	Range 5,000nm at 10.00 kts
	Bunker at max displacement = 1,616 tons (100% coal)

Complement:
	523 - 681

Cost:
	£0.856 million / $3.425 million

Distribution of weights at normal displacement:
	Armament: 712 tons, 6.7 %
	   - Guns: 706 tons, 6.6 %
	   - Weapons: 6 tons, 0.1 %
	Armour: 3,953 tons, 37.1 %
	   - Belts: 1,945 tons, 18.3 %
	   - Torpedo bulkhead: 345 tons, 3.2 %
	   - Armament: 907 tons, 8.5 %
	   - Armour Deck: 632 tons, 5.9 %
	   - Conning Tower: 123 tons, 1.2 %
	Machinery: 1,520 tons, 14.3 %
	Hull, fittings & equipment: 2,945 tons, 27.7 %
	Fuel, ammunition & stores: 1,418 tons, 13.3 %
	Miscellaneous weights: 100 tons, 0.9 %
	   - Above deck: 100 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  13,333 lbs / 6,048 Kg = 15.1 x 12.2 " / 310 mm shells or 12.5 torpedoes
	Stability (Unstable if below 1.00): 1.48
	Metacentric height 6.8 ft / 2.1 m
	Roll period: 12.7 seconds
	Steadiness	- As gun platform (Average = 50 %): 78 %
			- Recoil effect (Restricted arc if above 1.00): 0.27
	Seaboat quality  (Average = 1.00): 1.57

Hull form characteristics:
	Hull has a flush deck,
	  a ram bow and a cruiser stern
	Block coefficient (normal/deep): 0.550 / 0.557
	Length to Beam Ratio: 4.17 : 1
	'Natural speed' for length: 18.11 kts
	Power going to wave formation at top speed: 49 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -10.00 degrees
	Stern overhang: -3.28 ft / -1.00 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	25.00 %,  15.58 ft / 4.75 m,  13.94 ft / 4.25 m
	   - Forward deck:	30.00 %,  13.94 ft / 4.25 m,  12.30 ft / 3.75 m
	   - Aft deck:	30.00 %,  12.30 ft / 3.75 m,  12.30 ft / 3.75 m
	   - Quarter deck:	15.00 %,  12.30 ft / 3.75 m,  12.30 ft / 3.75 m
	   - Average freeboard:		13.12 ft / 4.00 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 90.9 %
		- Above water (accommodation/working, high = better): 83.4 %
	Waterplane Area: 18,023 Square feet or 1,674 Square metres
	Displacement factor (Displacement / loading): 105 %
	Structure weight / hull surface area: 146 lbs/sq ft or 713 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.88
		- Longitudinal: 3.06
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Cramped 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