Hulls

The more surface area of a hull "rubbing" against water, the greater the resistance. The hydrofoil concept reduces this wetted area to a fraction, by utilizing the wing-effect. Once the rider works the speed up to roughly 10 KMH (6 MPH), the Flyak is ready for take-off. Theoretically, the Flyak can achieve speeds nearly twice as fast as conventional championship-level racing kayaks.

However, you can not go very long distances on foils because it takes intense energy for the paddler to keep up on the foils.