Development and Design
The Northrop Gamma 2F was an attack bomber derivative of the Northrop Gamma transport aircraft, developed in parallel with the Northrop Gamma 2C, (of which one was built), designated the YA-13 and XA-16. The Gamma 2F had a revised tail, cockpit canopy and wing flaps compared with the Gamma 2C, and was fitted with a new semi-retractable undercarriage. It was delivered to the United States Army Air Corps for tests on 6 October 1934, and after modification, including fitting with a conventional fixed undercarriage, was accepted by the Air Corps. A total of 110 aircraft were ordered as the A-17 in 1935.
The resulting A-17 was equipped with perforated flaps, had fixed landing gear with partial fairing. It was fitted with an internal fuselage bomb bay that carried fragmentation bombs and well as external bomb racks.
Northrop developed a new undercarriage, this time completely retractable, producing the A-17A variant. This version was again purchased by the Army Air Corps, who placed orders for 129 aircraft. By the time these were delivered, the Northrop Corporation had been taken over by Douglas Aircraft Company, export models being known as the Douglas Model 8.
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