Thanks for your comments. It seems to be a question of not if, but how. As I understand it the monohull sailors are primarily using t-foils to promote early planing whilst in your boats you are using them to prevent nose diving/pitch poling, which is the problem on the Vortex. What I would like to know is how long are the fins which you use on the F16 ie from centre line of foil to end of fin, and what is the chord length at the base of the fin? Are the fins set up to give zero angle of attack during normal upwind sailing and are they symmetrical or assymetric? Ive seen the photos you have posted here but its very difficult to get an idea of scale from them. Any help gratefully received.