General Electric/Rolls-Royce F136

The General Electric/Rolls-Royce F136 was an afterburning turbofan developed by General Electric, the Allison Engine Company and Rolls-Royce as an alternative powerplant to the Pratt and Whitney F135 for the Lockheed Martin F-35 Lightning II. It derived from the General Electric YF120, with hot section development by Allison and fan development by Rolls-Royce, and the GE Rolls-Royce Fighter Engine Team formed in 2002 split the work 60 percent General Electric and 40 percent Rolls-Royce. Full engine runs began on 21 July 2004, and the engine produced 28,000 lbf (125 kN) dry and 43,000 lbf (191 kN) with afterburner. The partners stopped work in December 2011 after failing to gather Pentagon support for further development.