A go-kart was never meant to go this fast. Powered by a jet engine, this custom build reached an astonishing 143.7 miles per ...

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 ...