Mark

Tim has mentioned several times in this thread that the plane will twist and contort all over the place...but he said he has never had one fail in flight do to this. If it's not effecting the maneuvers you are doing don't worry about it...and just enjoy the show! Others have added extra spars and things to stiffen up the airframe more. But in Tim's opinion (and mine) you would just be adding unneeded weight. So get back out there and keep doing those rolling circles until the cows come home...these little planes luv'em!