About 10% but it's like Minn said. I have one plane I have it mixed into but it's just a big old Bipe I used to fly at IMAA events. I have been known to forget to turn it off but 10% is so little I never noticed it doing any stunts or landing. I got into the habit of using my rudder in turns so that mix is just one I never bother with anymore. It does work though!!