 The XSBC-2 won and a contract for this aircraft was signed in April 1935 and it made its first flight on 9 December 1935.The Wright XR-1510-12 engine in the XSBC-2 proved to be mechanically unreliable.In March 1936, this aircraft was re-engined with a 700 hp (522 kW) Pratt & Whitney R-1535-82 fourteen-cylinder, twin-row, air-cooled engine driving a three-blade propeller and redesignated XSBC-3.