Note: This engine is located in the Research & Development Gallery on a controlled-access portion of Wright-Patterson Air Force Base. The gallery will close until further notice beginning May 1, 2013, as part of budget reduction requirements due to sequestration.
General Electric designed the YJ93 engine to power a planned supersonic interceptor, the F-108, and a bomber, the North American XB-70, at speeds of 2,000 mph and at altitudes about 70,000 feet. The high-pressure variable-stator engine ran on special high-temperature JP-6 fuel and had a thrust-to-weight ratio above 5:1. The Air Force cancelled the F-108 program and only built two XB-70s. The engine was not used in any military or commercial aircraft other than the XB-70.