We have seen several broken fin boxes on windsurf boards because of the lifting load from the foil. In general, boxes that have the fin box well connected to both the top and botton skins on your board are strong enough, however if you have any doubt we recommend to reinforce your fin box for foiling.
We tried to build learning wings that were slow and stable, however found that our race wings were just as easy to learn on. While there is a lot of debate out there, strong and stable foils seem to provide both ease of learning as well as predictable control and high performance. This technology is new enough that most of our riders have learned foiling on F4.
F4 is currently building foils to order with availability at 3-5 weeks. To place your order, a deposit of $500 USD will hold your place on the list. Once your foil is completed and ready to ship, the final invoice will be sent.
F4 windsurf and kite foils use standard deep tuttle boxes. The tuttle box system is the closest to a world wide standard in the industry and F4 believes to be superior to plate mounted foils.
Hydrofoils are relatively new for windsurf boards and are evolving rapidly. Foils are faster already in some conditions and are keeping up with formula boards around the race course. Sometimes foils are faster, especially in light wind and downwind. Certainly, the foils provide a uniquely smooth ride and awesome sensation!