May 30, 2011
A HUMAN-POWERED HELICOPTER TAKES FLIGHT.
Related: Jetpack soars to 5000 feet. Of course, a human-powered helicopter that soared to 5,000 feet would really be news!
A HUMAN-POWERED HELICOPTER TAKES FLIGHT.
Related: Jetpack soars to 5000 feet. Of course, a human-powered helicopter that soared to 5,000 feet would really be news!