OSK Osmondagi - 1931 Oltrin Battleship

OSK Osmondagi, Oltrin State Celestial-class Battleship laid down 1931

Displacement:
	39,114 t light; 41,318 t standard; 44,501 t normal; 47,048 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(751.66 ft / 734.00 ft) x 108.00 ft x (32.00 / 33.52 ft)
	(229.11 m / 223.72 m) x 32.92 m  x (9.75 / 10.22 m)

Armament:
      9 - 16.00" / 406 mm 45.0 cal guns - 2,170.01lbs / 984.30kg shells, 100 per gun
	  Breech loading guns in turret on barbette mounts, 1930 Model
	  2 x 3-gun mounts on centreline, forward deck forward
		1 raised mount - superfiring
	  1 x 3-gun mount on centreline, aft deck aft
      9 - 5.50" / 140 mm 53.0 cal guns - 85.01lbs / 38.56kg shells, 200 per gun
	  Quick firing guns in turret on barbette mounts, 1924 Model
	  2 x 3-gun mounts on sides, aft deck forward
	  1 x Single mount on centreline, aft deck aft
		1 raised mount
      12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 500 per gun
	  Dual purpose guns in deck mounts, 1921 Model
	  6 x Twin mounts on sides, evenly spread
		2 raised mounts
      16 - 1.57" / 40.0 mm 39.0 cal guns - 2.01lbs / 0.91kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1930 Model
	  4 x Quad mounts on sides, evenly spread
		4 raised mounts
      Weight of broadside 20,715 lbs / 9,396 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	12.3" / 311 mm	460.00 ft / 140.21 m	18.00 ft / 5.49 m
	Ends:	9.60" / 244 mm	  98.80 ft / 30.11 m	18.00 ft / 5.49 m
	  175.20 ft / 53.40 m Unarmoured ends
	  Main Belt covers 96% of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		3.60" / 91 mm	460.00 ft / 140.21 m	32.00 ft / 9.75 m
	Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	17.0" / 432 mm	9.80" / 249 mm		10.5" / 267 mm
	2nd:	6.00" / 152 mm	3.00" / 76 mm		6.00" / 152 mm
	3rd:	2.00" / 51 mm	2.00" / 51 mm		      -

   - Armoured deck - multiple decks:
	For and Aft decks: 6.60" / 168 mm
	Forecastle: 2.00" / 51 mm  Quarter deck: 3.50" / 89 mm

   - Conning towers: Forward 18.00" / 457 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 109,656 shp / 81,803 Kw = 27.00 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 5,730 tons

Complement:
	1,531 - 1,991

Cost:
	£16.017 million / $64.070 million

Distribution of weights at normal displacement:
	Armament: 4,013 tons, 9.0%
	   - Guns: 4,013 tons, 9.0%
	Armour: 16,958 tons, 38.1%
	   - Belts: 5,067 tons, 11.4%
	   - Torpedo bulkhead: 1,961 tons, 4.4%
	   - Armament: 3,059 tons, 6.9%
	   - Armour Deck: 6,384 tons, 14.3%
	   - Conning Tower: 487 tons, 1.1%
	Machinery: 3,279 tons, 7.4%
	Hull, fittings & equipment: 14,629 tons, 32.9%
	Fuel, ammunition & stores: 5,387 tons, 12.1%
	Miscellaneous weights: 235 tons, 0.5%
	   - On freeboard deck: 100 tons
	   - Above deck: 135 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  65,510 lbs / 29,715 Kg = 32.0 x 16.0 " / 406 mm shells or 12.3 torpedoes
	Stability (Unstable if below 1.00): 1.21
	Metacentric height 8.0 ft / 2.4 m
	Roll period: 16.0 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.49
	Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
	Hull has a flush deck,
	  an extended bulbous bow and a round stern
	Block coefficient (normal/deep): 0.614 / 0.620
	Length to Beam Ratio: 6.80 : 1
	'Natural speed' for length: 27.09 kts
	Power going to wave formation at top speed: 51 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 25.00 degrees
	Stern overhang: 6.00 ft / 1.83 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	18.70%,  25.00 ft / 7.62 m,  20.00 ft / 6.10 m
	   - Forward deck:	28.00%,  20.00 ft / 6.10 m,  17.00 ft / 5.18 m
	   - Aft deck:	34.60%,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
	   - Quarter deck:	18.70%,  17.00 ft / 5.18 m,  20.00 ft / 6.10 m
	   - Average freeboard:		18.64 ft / 5.68 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 96.2%
		- Above water (accommodation/working, high = better): 129.1%
	Waterplane Area: 58,740 Square feet or 5,457 Square metres
	Displacement factor (Displacement / loading): 108%
	Structure weight / hull surface area: 211 lbs/sq ft or 1,030 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.98
		- Longitudinal: 1.19
		- Overall: 1.00
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room

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Misc Weight:
Flag Facilitiess: 100 tons On Deck
x1 Gunpowder Catapult: 20 tons Above Deck
x1 Heavy Duty Crane: 25 tons Above Deck
x3 Floatplane: 90 tons Above Deck

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Taper on Uniform Belt
Main Belt Thickness: 13.5"
Main Belt Height: 12ft

Taper Bottom Thickness: 6"
Taper Height: 6ft

Average Thickness: 12.25"
Total Height: 18ft

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Strake Rudimentary Calc
40% of end = 98.8ft
2/3rds belt = 9" + 0.6" = 9.6"

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