Hydrofoils? yes but only in half scale models for testing, I decided many years ago that true hydrofoils were fraught with a few very difficult excentricities that made for design difficulties that are still as pertinent today as when they were avidly experimenting with in the 1950's. There have been some very great innovations in recent years, but the draw backs that are present still leave a lot to be desired for a craft to "put out" for general sailing purposes. To put it in another way, the con's, as far as I am concerned, still outway the pro's
I have designed a variation on the "foil borne" sailing craft though, that has passed all testing with flying colors, BUT, although we have sailed a full scale 4.3 test version of it, it has the appearance and out right performance that I feel would completely inhibit it from proving a commercial success at this point in time, and I am afraid that I am a little past the stage in life of producing some thing just to "prove" a point and satisfy my own ego. Still who knows, if interest moves in that direction we may just produce them.
As opposed to "sailing craft" or "hydrofoils" I call this an "Aqu Glider".