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 an effort to create a simpler, more affordable form of jet propulsion, University of Maryland spinoff Wave Engine Corporation has developed a digitally controlled modern-day pulsejet engine for ...