I would have to agree as well, a positive way to shut down the engine is a must have. I've had the throttle linkage fail while one of my nitro boats was running, resulting in having to run in circles until the tank was empty. Had it happened on a plane, there's no telling where it would have ended up as it took over 5 minutes of doing donuts in the middle of the pond before it finally quit and that was after running a mile(5 laps) race plus the prerace warm up and jockeying with other boats.