This NACA High-Speed Flight Research Station photograph of the Republic XF-91 Thunderceptor, was taken in 1951 on the South Base ramp at Edwards Air Force Base. The Republic XF-91 Thunderceptor was a single-place fighter, powered by a General Electric J47-GE-17 turbojet engine. The wing had a sweep angle of 40 degrees at the 50-percent-chord line and had inverse taper and variable incidence. The root chord (airplane center line) had a dimension of 95 inches while the wing tip chord measured 154.5 inches. The wing incidence was variable in flight through a range from -2 degrees to 5.65 degrees.