I built a little biplane that flys with a cox .020 and it had undercambered wings. I used monokote on it and stuck it to the underside and it worked out fine for me. The way I did it though was using the monokote iron I made sure it was stuck down to the inner most rib, then I pulled the monokote taught (not increadibly tight, just enough to get the major wrinkles out) then I stuck it down to the next rib and did that all the way out to then wing tip. Once it is all done, I took the iron and ran it over the open bays just a little to slightly shrink up the monokote. It has been stuck on for several years now and I did not use any kind of glue on the balsa either. If I had to do it over again, I would have just made that plane a flat bottom though.


David