If you have seperate servos on your ailerons & a computer radio, program in roughly 2-4 degrees so BOTH ailerons will move UP at the flip of a switch. That will kill your lift and it will push the plane down at a controllable rate. Start out with 2 degrees first and increase the degrees as necessary. This will still allow both ailerons to work for roll control. I use this on my large models to stop imediately after landing. I deploy them once on the ground, & my ailerons both deflect to 30 degrees. The plane acts like it has brakes. Hope this helps....Gene