The Allison J35 was originally developed by the General Electric Company in parallel with the Whittle-based centrifugal-flow J33, and was the Air Force's first axial-flow (straight-through airflow) compressor engine. The J35 was fairly simple, consisting of an eleven-stage axial-flow compressor and a single-stage turbine. With the afterburner, which most models carried, it produced 7,400 lbf.