I had been considering using an Arduino to make an electric Axe controller with a couple of modes, switched between using the AUX 1 on the transmitter. Mode 1, you use the rudder stick to manually fire back and forth. Mode 2, you use the throttle stick to control the speed the axe fires automatically back and forth. I was going to use some small switches near shaft to act as limit switches so the axe knows where it is. However I am not sure its actually that simple, but I will give it a try regardless, I am sure you can come up with something better.