Chungdi-Class Battleship [1906] (Seondok)

Chungdi-Class, Seondok County Battleship laid down 1906

Displacement:
	14,690 t light; 15,650 t standard; 17,183 t normal; 18,409 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(488.85 ft / 475.72 ft) x 85.30 ft x (26.25 / 27.74 ft)
	(149.00 m / 145.00 m) x 26.00 m  x (8.00 / 8.46 m)

Armament:
      4 - 12.20" / 310 mm 42.0 cal guns - 881.44lbs / 399.81kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1896 Model
	  2 x Twin mounts on centreline, evenly spread
      12 - 7.87" / 200 mm 50.0 cal guns - 258.40lbs / 117.21kg shells, 175 per gun
	  Breech loading guns in turret on barbette mounts, 1904 Model
	  6 x Twin mounts on sides, evenly spread
      24 - 3.44" / 87.5 mm 40.0 cal guns - 19.60lbs / 8.89kg shells, 450 per gun
	  Quick firing guns in casemate mounts, 1894 Model
	  24 x Single mounts on sides, evenly spread
		12 raised mounts
		12 hull mounts in casemates- Limited use in all but light seas
      20 - 0.98" / 25.0 mm 55.0 cal guns - 0.51lbs / 0.23kg shells, 300 per gun
	  Quick firing guns in casemate mounts, 1901 Model
	  20 x Single mounts on centreline, evenly spread
		20 double raised mounts
      Weight of broadside 7,107 lbs / 3,224 kg
      Main Torpedoes
      4 - 21.7" / 550 mm, 32.81 ft / 10.00 m torpedoes - 2.048 t each, 8.191 t total
	submerged bow & stern tubes
      2nd Torpedoes
      8 - 21.7" / 550 mm, 32.81 ft / 10.00 m torpedoes - 2.048 t each, 16.382 t total
	below water reloads

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	12.2" / 310 mm	314.96 ft / 96.00 m	11.09 ft / 3.38 m
	Ends:	3.94" / 100 mm	160.73 ft / 48.99 m	11.09 ft / 3.38 m
	Upper:	6.10" / 155 mm	314.96 ft / 96.00 m	8.01 ft / 2.44 m
	  Main Belt covers 102 % of normal length
	  Main Belt inclined 5.00 degrees (positive = in)

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		2.95" / 75 mm	314.96 ft / 96.00 m	24.31 ft / 7.41 m
	Beam between torpedo bulkheads 59.06 ft / 18.00 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	12.2" / 310 mm	7.87" / 200 mm		9.84" / 250 mm
	2nd:	7.87" / 200 mm	5.91" / 150 mm		6.89" / 175 mm
	3rd:	2.95" / 75 mm	0.98" / 25 mm		      -
	4th:	0.98" / 25 mm	      -			      -

   - Armoured deck - multiple decks:
	For and Aft decks: 2.95" / 75 mm
	Forecastle: 2.95" / 75 mm  Quarter deck: 2.95" / 75 mm

   - Conning towers: Forward 12.20" / 310 mm, Aft 0.00" / 0 mm

Machinery:
	Coal fired boilers, steam turbines,
	Direct drive, 4 shafts, 24,109 shp / 17,985 Kw = 20.50 kts
	Range 7,500nm at 10.00 kts
	Bunker at max displacement = 2,760 tons (100% coal)

Complement:
	749 - 975

Cost:
	£1.407 million / $5.629 million

Distribution of weights at normal displacement:
	Armament: 1,472 tons, 8.6 %
	   - Guns: 1,435 tons, 8.4 %
	   - Weapons: 37 tons, 0.2 %
	Armour: 7,059 tons, 41.1 %
	   - Belts: 2,829 tons, 16.5 %
	   - Torpedo bulkhead: 837 tons, 4.9 %
	   - Armament: 1,637 tons, 9.5 %
	   - Armour Deck: 1,581 tons, 9.2 %
	   - Conning Tower: 175 tons, 1.0 %
	Machinery: 1,722 tons, 10.0 %
	Hull, fittings & equipment: 4,287 tons, 24.9 %
	Fuel, ammunition & stores: 2,493 tons, 14.5 %
	Miscellaneous weights: 150 tons, 0.9 %
	   - On freeboard deck: 50 tons
	   - Above deck: 100 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  24,153 lbs / 10,956 Kg = 26.6 x 12.2 " / 310 mm shells or 3.0 torpedoes
	Stability (Unstable if below 1.00): 1.31
	Metacentric height 6.4 ft / 1.9 m
	Roll period: 14.2 seconds
	Steadiness	- As gun platform (Average = 50 %): 66 %
			- Recoil effect (Restricted arc if above 1.00): 0.35
	Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
	Hull has a flush deck,
	  a ram bow and a cruiser stern
	Block coefficient (normal/deep): 0.565 / 0.572
	Length to Beam Ratio: 5.58 : 1
	'Natural speed' for length: 21.81 kts
	Power going to wave formation at top speed: 49 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -4.00 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 %,  19.69 ft / 6.00 m,  16.40 ft / 5.00 m
	   - Forward deck:	30.00 %,  16.40 ft / 5.00 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:		15.60 ft / 4.76 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 101.1 %
		- Above water (accommodation/working, high = better): 110.6 %
	Waterplane Area: 28,712 Square feet or 2,667 Square metres
	Displacement factor (Displacement / loading): 102 %
	Structure weight / hull surface area: 148 lbs/sq ft or 721 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.69
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Adequate accommodation and workspace room
	Good seaboat, rides out heavy weather easily