Tonky Frans is one of the Bonaire windsurfing freestyle superstars featured in the movie Children of the Wind. He is a cousin of the current world champion, Kiri Thode. I shot the video at right of him doing a chacho. First, at 0:24 he flips the board around and sails fin-first for a while. At 1:50 he starts pumping his small freestyle board up onto a plane. At 2:10 he launches the chacho. I followed this with a slow-motion repeat of the chacho, a move during which he entirely lets go of the boom for a full 0.2 seconds while everything is spinning around. (Be sure to enlarge the video to HD, full-screen.)
This is Bill vdB, sharing little vignettes of windsurfing on Sayers Lake, in Howard PA. and sometimes elsewhere.