> Stu points out that the aileron gap serves to > increase drag on the down wing, thereby > reducing or eliminating adverse yaw. However, > I also read an article about how important gap > seals are for increasing climb performance. So Gaps seal?
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Gap seals are generally used to eliminate airflow from bottom to top or top to bottom of a control surface. The 6 foot piano hinge does that quite effectively on the KR aileron. Whether the considerable gap between the trail edge of the wing and lead edge of the aileron on the bottom of the wing has any ill effect is questionable. I did not seal that opening on the bottom of the wing and I get a very good climb rate. Others have professed that it helps the climb rate. All else being equal, I question that claim. As to adverse yaw, if built to plans ( aileron travel - 20 degrees up and 10 degrees down) on a wing eliminates adverse yaw in the KR. I can roll in to a 30 degree bank with my feet flat on the floor and the ball stays perfectly centered. The up aileron on the down wing creates more drag than the down aileron on the up wing or at least neutralizes it. The 3 degree washout on the wing called for in the plans also allows the ailerons to be fully effective through a straight ahead power off stall without any need for rudder input. I have tufted wing video to validate that. Any changes made to the above criteria will surely have some adverse affect and , as always, your results may differ. There is a wealth of info on the web. Just "google" aileron, differential aileron, frise aileron, etc. Larry Flesner
