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 ...

If you’ve ever watched or been on an aircraft sitting on the runway, you might notice the engines begin to hum and spin just before the plane moves. This process is called spooling up, and it’s a ...