they do, but the battery life isn't really long enough for what I'd like to do. A big enough battery is weight prohibitive. I'd like to be able to keep this thing in the air several hours for endurance flying. You get to the point where a battery that big weighs the same as a magneto. The ideal solution would be no ignition system, and low fuel consumption, and low overall weight. It sounds like I would more than offset the weight savings of no ignition with extra fuel.