General Electric YJ101

The General Electric YJ101 was an afterburning turbojet in the 15,000 pounds-force class, designed for the Northrop P-530 Cobra but first applied to the Northrop YF-17 in the Lightweight Fighter competition. It was later developed into the widely used General Electric F404. Reliability, measured by the in-flight shutdown rate, and stall-free handling across the flight envelope were the two essential requirements. The engine bled air continuously from the compressor to cool the afterburner liner and nozzle, without mixing it into the turbine exhaust, so GE could call it a leaky turbojet for simplicity or the first self-cooled turbojet for advanced technology. It was a two-shaft design with a three-stage low pressure and a seven-stage high pressure axial compressor and a bypass ratio of 0.25 to 1.