GreaTOne 65,

I tune with them running as well but there's no way I can in good conscience advise others to do so. I've hand propped full scale planes but I won't advise others to do so. My point is that because you and I get away with it does not mean others will, and should an accident happen we are part of the liability chain if we advised to tune with the engine running. Therefore I do not and will not ever recommend or suggest that an engine be tuned with the engine running. The ONLY safe way is with the engine shut down.

More work, more time, absolutely, but you cannot get hurt that way. If you're in the U.S. you will not escape the liability apportionment in a civil injury trial had you given advice promoting the tuning of a running engine. Just because you said it over the internet does not relieve you of civil liabilty and believe that you will be found regardless of you internet name. In over 25 years I'm surprised that you have never learned how responsibility, liability and litigation works.

No, I'm not a trial attorney or para legal but I've been closely associated with legal professionals (civil and criminal trial attorneys, DA's, Sheriffs, and cops) and I've payed a little attention along the way. Because you are not aware of your liability is not an excuse when the judge's gavel hits the table. There's too much to lose if somebody is stupid and places a part of their body or other object into the path of a powered propeller. This is why I say what I do and will never advise tuning a running propeller driven engine.

Think on this for awhile and consider what you might want to do.