http://www.gizmag.com/go/4038/
http://www.pumpabike.com/Site1/
video here
http://video.google.ca/videosearch?h...8&sa=N&tab=wv#
May 16, 2005 To look at the Pump-a-bike, you’d swear it would sink the moment it hit the water. Not so, indeed, with a bit of practice, the human powered hydrofoil is capable of nearly 20 miles per hour – not that much shy of the world record for human powered watercraft . To make it work, all you need to do is jump up and down. Given some time to coordinate the movements and gain a degree of mastery, the Pump-a-bike can even be used in surf to ride waves.