Skycycle X-2 was a steam-powered rocket. An earlier prototype, the Skycycle X-1 designed by Doug Malewicki, and former U.S. Navy engineer Robert Truax superficially resembled a motorcycle. The Skycycle X-2 was designed by Bob Truax, and ridden by Evel Knievel in his attempt to jump the Snake River Canyon near Twin Falls, Idaho on September 8, 1974. The parachute deployed during the launch, causing the stunt to fail.[1] A later analysis showed that a design flaw in a mechanical parachute retention cover, which didn't properly take base drag into account, caused the premature parachute deployment, though Truax blamed Knievel for the failure and vice versa. Later Truax accepted full responsibility for the failure.[2] In 2007 a Skycycle X-2 was offered for sale for $5,000,000.[3]