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B-17 Upper Machine Gun Turret (Type A-1A)

DAYTON, Ohio -- B-17 Upper Machine Gun Turret (Type A-1A) in the World War II Gallery at the National Museum of the U.S. Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- B-17 Upper Machine Gun Turret (Type A-1A) in the World War II Gallery at the National Museum of the U.S. Air Force. (U.S. Air Force photo)

This turret was one of the first fully-powered machine gun turret designs used to equip American aircraft and was used initially on the B-17E Flying Fortress. It is operated by an electro-hydraulic system, which powers both elevation and traverse of the turret's two .50-cal. M2 Browning machine guns, and has a rate of fire of 1,400-1,600 rounds per minute. Turrets of this and later types gradually replaced manually-operated machine guns introduced for bomber defense during the First World War, and so made the bomber and more formidable opponent to attacking fighters. This turret was manufactured by the Emerson Manufacturing Co. to a Sperry Gyroscope Co. design and was donated to the museum by the Hobart Corp. of Troy, Ohio.

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Mask Policy:
In accordance with the updated guidance released by the Center for Disease Control and Prevention (CDC), the Department of Defense (DoD) and Wright-Patterson Air Force Base, the National Museum of the U.S. Air Force will require all visitors to wear face masks indoors effective July 30, 2021 until further notice.

Visitors ages three and up will be required to wear masks while indoors at the museum. This policy applies to all visitors, staff and volunteers regardless of vaccination status. Visitors may wear their own masks or a free paper mask will be provided. Cloth masks will also be available for purchase in the Museum Store.
Additional information available here.

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