RE: centering aileron electronically
That's all there is to it--plug the ailerons into the Rx, (with a battery) and turn your Tx on, The servos will go to neutral, or their center. Make sure your Tx trims are also at center. This allows you to set your aileron linkages so the ailerons are even and neutral also, then once you fly it, you can adjust the trims on your radio for proper flight performance. You'll also do this with your elevator and rudder servos.