The XF3J had elliptical fabric covered wings which gave it the appearance of a butterfly. The fuselage was semimonocoque metallic with an aluminum skin. The undercarriage was fixed, and would be the last biplane fighter without a retractable gear that the U.S. Navy would test. The aircraft performed satisfactorily in testing, but more promising aircraft had been developed and, in September 1935, the program was terminated.[1]