I don't consider myself lucky when my elevator linkage doesn't come loose or the rudder or ailerons. See what I mean? Luck doesn't usually play a part when you install everything correctly. I do however use a choke servo on my big gas engines. It's there mostly to make it easy to choke the engine for starting but it can be used to stop the engine in an emergency. I routinely stop my engines by using the trottle kill function on my radio. Been doing it that way for years and it hasn't failed yet.