Jim, I'm in the right boat. I have had all three method's plus an appropriate throttle set-up plus fail safe. And have never used anything other than throttle trim to shut down after landing. You took that the wrong way. It was meant as sarcasm. On nitro we don't have any mean's outside of failsafe, if turned on and only under certain circumstances. And such larger engine's as with the radial's the issue's are compareable (prop wise) to gas. Of course the little one's can do as much damage when not handled safely.  Point is only a throttle servo is required to operate an engine, you know what I mean by only. Everything else is an option.