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 ...

The notion of putting jet engines in cars in one that won't go away. For literally decades, major automakers have played around with the concept. Most recently, Elon Musk teased that the long-awaited ...