The J58 engine was more than propulsion, it was a revolution. Capable of operating as both turbojet and ramjet, it delivered continuous afterburner thrust for hours. Pratt & Whitney’s engineers solved ...

Lockheed’s engineers built the J58 engine to do the impossible, operate as both a jet and a ramjet. At Mach 3 and 85,000 feet, it pushed the SR-71 through temperatures that melted titanium and tested ...