From the minds of Lockheed’s secretive “Skunk Works” team, they brought in engineers from Pratt & Whitney along with the Rolls-Royce team that developed the Harrier Jet (original fighter jet with vertical lift-off ability). The F-35 engine uses an after burning turbofan that can bend 90-degress down along with opening a front duct to produce a 50-50 split of 18,680lbs-ft of thrust for a total out-put of 3,290lbs-foot.