the second prototype sev-3 was completed as a two-seat fighter derivative, the sev-2xp. it was powered by a 735 hp (548 kw) wright r-1820 radial engine, had fixed landing gear in aerodynamic spats and was armed with one .50 in (12.7 mm) and one .30 in (7.62 mm) forward-firing machine guns plus an additional .30 in (7.62 mm) gun for rear defence.