I always "reasoned" that on should be toward the rear in case you hit a bird it wouldn't turn the switch off. "Reasoned" ?? Like after hitting a bird with a model airplane you would still have something left to fly. I once saw a guy hit a turkey vulture with a small 20 size low wing sport plane, nothing but balsa pieces floating to the ground and the turkey vulture flew over to a nearby tree to lick his wounds. Score....bird 1, plane 0. I do agree with doing all of your planes the same so you don't mess up turning the plane on before and off after a flight.