With the release of the CG fin, which sounds like a real breakthrough, it got me thinking of some of the other ideas that came and went. Off the top of my head, I think of things like the side force enhancer (SFE) or the micro wings ( additional small wing added to the fin) that people were initially excited about. I am old enough to remember an articulating wing that moved by a rod that reacted to heel pressure in the front boot to act as an active brake. that one was deemed illegal. So folks, what other gimmicks came and went over the years?