Bob Maddox’s stage name, Crazy Rocketman, is a misnomer. Maddox doesn’t build rockets. He builds pulse-jet engines. There’s a difference. As for the crazy part—that may be true. Maddox is the world’s ...

In the late 1940s, GE introduced the J-47 gas turbine engine, which became the most-produced jet engine of the early jet age, ...