USS Michigan, BB-73, Revision 4

USS Michigan, USN Ohio-class Battleship laid down 1945

Displacement:
	78,029 t light; 83,271 t standard; 87,957 t normal; 91,706 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(964.02 ft / 935.00 ft) x 130.00 ft x (43.00 / 44.43 ft)
	(293.83 m / 284.99 m) x 39.62 m  x (13.11 / 13.54 m)

Armament:
      9 - 18.00" / 457 mm 48.0 cal guns - 3,850.00lbs / 1,746.33kg shells, 130 per gun
	  Breech loading guns in turret on barbette mounts, 1945 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
      20 - 6.00" / 152 mm 47.0 cal guns - 130.01lbs / 58.97kg shells, 403 per gun
	  Dual purpose guns in deck and hoist mounts, 1945 Model
	  6 x Twin mounts on sides, forward deck aft
		2 raised mounts - superfiring
	  4 x Twin mounts on sides, aft deck forward
		2 raised mounts - superfiring
      28 - 3.00" / 76.2 mm 50.0 cal guns - 13.01lbs / 5.90kg shells, 1,500 per gun
	  Dual purpose guns in deck and hoist mounts, 1945 Model
	  12 x Twin mounts on sides, evenly spread
		6 raised mounts
	  2 x Twin mounts on centreline ends, evenly spread
		2 double raised mounts
      40 - 1.57" / 40.0 mm 56.3 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun
	  Anti-air guns in deck mounts, 1945 Model
	  6 x Quad mounts on sides, forward evenly spread
		2 raised mounts
	  4 x Quad mounts on sides, aft evenly spread
		2 raised mounts
      Weight of broadside 37,699 lbs / 17,100 kg

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	16.1" / 409 mm	467.50 ft / 142.49 m	13.68 ft / 4.17 m
	Ends:	0.25" / 6 mm	467.48 ft / 142.49 m	13.68 ft / 4.17 m
	Upper:	0.25" / 6 mm	467.50 ft / 142.49 m	8.00 ft / 2.44 m
	  Main Belt covers 77 % of normal length
	  Main Belt inclined -15.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
		11.0" / 279 mm	467.50 ft / 142.49 m	40.35 ft / 12.30 m
	Beam between torpedo bulkheads 110.00 ft / 33.53 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	22.5" / 572 mm	9.58" / 243 mm		21.3" / 541 mm
	2nd:	4.00" / 102 mm	1.50" / 38 mm		4.00" / 102 mm

   - Armoured deck - multiple decks:
	For and Aft decks: 8.00" / 203 mm
	Forecastle: 0.25" / 6 mm  Quarter deck: 0.25" / 6 mm

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

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 4 shafts, 284,444 shp / 212,195 Kw = 33.00 kts
	Range 10,000nm at 15.00 kts
	Bunker at max displacement = 8,435 tons

Complement:
	2,552 - 3,319

Cost:
	£46.576 million / $186.303 million

Distribution of weights at normal displacement:
	Armament: 6,167 tons, 7.0 %
	   - Guns: 6,167 tons, 7.0 %
	Armour: 31,603 tons, 35.9 %
	   - Belts: 4,805 tons, 5.5 %
	   - Torpedo bulkhead: 7,677 tons, 8.7 %
	   - Armament: 8,008 tons, 9.1 %
	   - Armour Deck: 9,579 tons, 10.9 %
	   - Conning Towers: 1,534 tons, 1.7 %
	Machinery: 7,183 tons, 8.2 %
	Hull, fittings & equipment: 32,777 tons, 37.3 %
	Fuel, ammunition & stores: 9,928 tons, 11.3 %
	Miscellaneous weights: 300 tons, 0.3 %
	   - Hull above water: 60 tons
	   - Above deck: 240 tons

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  158,189 lbs / 71,753 Kg = 54.2 x 18.0 " / 457 mm shells or 35.2 torpedoes
	Stability (Unstable if below 1.00): 1.09
	Metacentric height 8.8 ft / 2.7 m
	Roll period: 18.5 seconds
	Steadiness	- As gun platform (Average = 50 %): 68 %
			- Recoil effect (Restricted arc if above 1.00): 1.00
	Seaboat quality  (Average = 1.00): 1.41

Hull form characteristics:
	Hull has a flush deck,
	  an extended bulbous bow and large transom stern
	Block coefficient (normal/deep): 0.589 / 0.594
	Length to Beam Ratio: 7.19 : 1
	'Natural speed' for length: 35.49 kts
	Power going to wave formation at top speed: 54 %
	Trim (Max stability = 0, Max steadiness = 100): 48
	Bow angle (Positive = bow angles forward): 30.00 degrees
	Stern overhang: 6.50 ft / 1.98 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	25.00 %,  39.00 ft / 11.89 m,  36.00 ft / 10.97 m
	   - Forward deck:	25.00 %,  36.00 ft / 10.97 m,  36.00 ft / 10.97 m
	   - Aft deck:	25.00 %,  36.00 ft / 10.97 m,  36.00 ft / 10.97 m
	   - Quarter deck:	25.00 %,  36.00 ft / 10.97 m,  36.00 ft / 10.97 m
	   - Average freeboard:		36.30 ft / 11.06 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 71.1 %
		- Above water (accommodation/working, high = better): 246.3 %
	Waterplane Area: 91,683 Square feet or 8,518 Square metres
	Displacement factor (Displacement / loading): 117 %
	Structure weight / hull surface area: 265 lbs/sq ft or 1,291 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.92
		- Longitudinal: 2.11
		- Overall: 1.00
	Excellent machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Good seaboat, rides out heavy weather easily

Aviation Facilities:
-2 rotating compressed air catapults on quarter deck
-Internal hangar with room for 2 OS2U Kingfisher seaplanes.

One of 4 Ohio-class battleships constructed by the United States of America at the end of World War II. Served with distinction in the Korean War, the Vietnam War, World War III, the American Intervention in the Lebanese Civil War, and the Gulf War.