The Aquaskipper is a clever little water toy that allows a user to skim the surface of a body of water. Here's how it works:
Every time you jump, the force of your weight compresses the fiberglass spring, causing the back foil to change its angle. From the same impact of your jump, the angled back foil is pushed downward to generate the propulsion.
The front foil is locked to a constant height in the water by the skimmer, which planes on the surface of the water.
You have to keep going at least 5 MPH or the craft will sink. There's a video of people using it at the link. Product Link -via CrunchGear | Photo: Gadgets and Gear