OK, now that we have that sorted out, let's start talking about Vortex Generators... <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />

And Bill, all top level competition aerobatic aircraft use completely symetrical wings now, they fly just as well upside down as right-side up, same as Ben's Wing has to be symetrical for use on each tack. The difference is Ben has a slotted flap that he uses to change the camber to asymetric, on each tack. The competition acro planes do not use flaps. (Google up a good picture of a Sukoi 31 wing)