Dirtybird, be sure to tell your doctor that you fly RC and use an engine that requires a spark. There have been several guys in my club that had to give up ignition engines because it was interfering with their pacemaker and they felt it. Not having one I don’t know what the symptoms were but they avoid the gasoline engines now whenever there is one running nearby. By the way, they also had to bring their transmitter in to the doctor’s office to have it on while the pacemaker was being monitored. No problem there.Dan.