The
XA-8 won a competition against the
General Aviation/Fokker XA-7, after which 13 service test aircraft were ordered (five as
YA-8s and eight as
Y1A-8s). After the completion of testing, 11 of these aircraft were redesignated
A-8. The A-8 was the first Curtiss machine of all-metal low-wing monoplane configuration with advanced features such as automatic
leading edge slats and trailing-edge
flaps. Four forward-firing
machine guns were mounted in the wheel fairings, and an additional weapon of the same calibre was fitted in the observer's
cockpit for rear defense. The standard bomb load was four bombs. One
YA-8 was fitted with a
radial engine and designated
YA-10, while another was used for testing of the Curtiss
V-1570 Conqueror engine as the
Y1A-8A. This aircraft was redesignated
A-8 upon the completion of testing. 46 aircraft were ordered as
A-8Bs, however the order was changed to the
Model 60 A-12s before production began. ==Operational history==