O.K., this video has my curiosity up. The boat is a one design SL33, designed by Morrelli & Melvin and built by Hakes Marine . The video shows it foiling nicely, but it looks like it has a curved foil on port (windward hull) and "possibly" a L foil on starboard. Can't tell what the rudders are. Here are some pics of the SL33 foiling with a soft rig. Looks like it might be an S foil on the windward hull. Any body have any knowledge here?