geron wrote:the front wing is smaller because the back wing produces lift as well and the lift of both ad to the total lift; is this unique to this foil? Do all the other directional foil's back wing produces negative lift?
The french hydrofoil Gong Elevator is also based on a lift / lift configuration , but with a standard big wing at front and smaller wing at back (both having positif Angle of Attack). It raised a lot of discussions on french forums and tests/users proved that it changes the foot pressure partition, helped the slow planning and low wind abilities, and was good for the first rides for beginners but was limited in speed. Skilled riders had to add an intermediate "wedge" piece to bring the rear stabilizer back to a negative AoA (so negative lift like on quite every standard foils) , to go faster.
That is the only one I know appart from earlier tests on custom hydrofoils years ago.
For this Zeeko great innovation, that I am also very curious about ( and trustfull a priori knowing zeeko experience), I don't know if the speed is similarly limited , knowing that for carving and surf ( which is its objective), speed is not the main requirement , and can even become an ennemy ...).