This talk about flat bottomed wings and inverted flying reminded me of the time RCM had a construction article on the RCM Funster. For those of you who don't know, the Funster was a 70 or 72" low winger, a big slow flying sport plane, but it had flaps, and the article said "the Funster can be flow inverted all day long with those flaps down, or up if its inverted." I thought they were just having fun with us, but a years later I ordered a Funster kit from Hobby Lobby and when I unrolled the plans there they were, flaps! I built the wing as designed, flaps and all, and guess what, the first time I pushed out of a loop half way up the danged thing flew out of it inverted just as easy as if it had a semi-symetrical or full semi airfoil! I didn't have to struggle to maintain level flight with it either. They were right, I could fly inverted all day if I wanted too. Matter of fact I'm still flying the wing, although on another plane, a sort of semi-scale Crop-Duster. The Funster really lived up to it's name alright. I still have the plans and may someday build another one. "Famous often heard words!"