This unusual approach to hydrofoils is a challenger for the world human-powered hydrofoil speed record. You can see more photos and video by visiting:
My personal observation is that apparently if you make submerged foils wide enough, the roll rate will be so slow that roll control will be easy enough. Furthermore, if the submerged foils are sized to a precise speed, pitch stability is manageable. At higher speeds difficulty in control, especially in pitch, might increase.
These observations are based on the belief that the pilot's hands are totally occupied with the paddles and his legs appear to be straight within the confines of the narrow hull. This observer concludes that there is no control input from the pilot (except perhaps by using his feet on pedals?) Hopefully contact can be made with the operators and these questions can be resolved.
Most of these album photos are from Flayak's published web site.
Posted by R V 5/29/2013
Also known as the Foil Kayak?