I,m currently installing foils on my 1995 Cadillac Deville Concourse--should increase mpg by a substantial amount ;]

Funny --I recall the 12 meter A C races when winglets on the bottom of the keel was the design breakthrough ---suddenly you saw winglet keels everywhere --so --we need to be a little carefull about getting caught up in the current designs --but it seems foiling and higher sailing speeds are here to stay.It looks like great fun too .