John and I punched a few buttons, and the 1, 900-pound-thrust Williams-Rolls turbofans spooled up.

FORBES: Jet Pilot for a Day

By 2007, Peter imagines 10 X-Racers launching side-by-side with the help of 1, 800-pound-thrust, kerosene hungry engines.

ENGADGET: Rocket Racing coming in 2007