Tigger:

You are more than welcome to copy it and send it to whomever you would like; it is not copy righted.

I think it is also a lot simpler than the method published in MAN (or RCM) a few months ago.

I fly almost exclusively three blade props, had to learn how to balance them in self defense. And self protection. Vibration problems can be a lot worse with twin engines. And yes, I am a member of the real modeling elite - the totally insane who scratch build twins. The folks who scratch four-engined monsters are, if possible, even more insane. Please note that I did not say build from plans.

Just another plane when built from plans,
. But when scratch built it's no other man's.

Bill.