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U.S. 8”/55 Mark 9 Gun


Photograph of 8"/55 Mark 9 gun turret

National Archive #19-N-76911. Cropped by author.


Specifications:


Bore
8"
203.2mm
Ammunition
Bagged APC or HC shells
Weight of round 260 lbs
118 kg
Velocity 2800 feet per second
853 meters per second
Maximum elevation     
41 degrees
Range 31,860 yards
29,130 yards
Firing cycle 18 seconds


This gun was used on most U.S. heavy cruisers built before the war, as well as the Lexingtons.

By the time of the Okinawa campaign, the fire control systems of many heavy cruisers were modified to use a reduced propellant charge that yielded a nominal muzzle velocity of 2150 feet per second (655 m/s). This permitted more frequent use of plunging fire during shore bombardment while greatly reducing barrel wear.

References

Campbell (1985)

Morison (1959)



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