funny, there are films, of elaborite demonsrations of foils in a flowing fluid, where they can inject die in nice neat parallel bands accross the flow, and they detach at the foil accelerat and deform on the top, and reatch at the trailing edge saw them over on homebuiltairplanes.com, where there is a bunch of top shelf engineers, who hold court, and the perenial topic of lift is disccused and joked about, ie: lift is caused by money... films are old black and white...mit or bell labs, maybe naca....old....well done