The ailerons and flaps have a fair bit of gap. The supports are mounted under the wing. This is how the original plane was designed and it takes a bit of time to make sure that everything is lined up. After reading several owner reviews I also maxed out the aileron throws. Its about 1" both up and down! It turns as quick as a sport plane but the rolls are still quite slow. I have a TH75 on mine and it flys much faster than I expected at throttle and then will land at a walk. Fun airplane to fly and that big unique wing shape has to be seen to be appreciated.