From the beginning my extra has been quirky in the air. I had a flying buddy fly my plane - maybe he can tell me what he thinks. He said during vertical the plane wants to pull to the left. Even with Right Rudder he had difficulty maintaining straight climb. Also, at the end of the loop the plane wants to drop its right wing. And this happens everytime. During level flight the plane tracks straight both upright and inverted. Since the plane favors to pull to the left on a climb it does a nice hammer head to the left. It struggles to the right. He brought the plane back down and inspected it. All moving surfaces are ok. The elevator he said is a tad off. the right is 1/8" higher at full up elevator and 1/8" lower during down elevator. but he didn't have an explanation why the plane was behaving as it was . He looked at it from the tail and he said the vertical stab is right on. Wings are all straight. He looked at my servo's. he suggested maybe I should swap the elevator servo's and see what happens.

After he told me all that - I took the plane up again. sure enough - during vertical the plane pulls to the left. I thought it was the wind all this time. When I enter a loop the plane tracks nicely. going over to the top and she goes nicely. coming back down and she is tracking nicely. right at the bottom I give it a tad bit more elevator to complete the loop and right at the bottom the Right Wing drops. I'm thinking perhaps at the end of the loop I dropped airspeed and that wing stalled momentarily. My loops are generally big and round - usually flat at the top - And I try to maintain the same airspeed all the way around.

what do you guys think?