While interesting, I'm not convinced that is 35 knots. The boat does not seem as fast as it should be in those conditions. Last in the video, they pass some Sunfish type boats. If you look at how far they are not heeled over, it just doesn't look like the wind is all that strong. Yes, they are going down wind, but if one assumes the sails are trimmed correct on the camera boat, then the Sunfish type boat is on a broad reach, which means it should have some heel. Its sailing flat which means something doesn't add up.