Never seen this question before, talked to an old timer this evening that hasn't flown in about 20 years (well, maybe like once or twice a year each year since he was big into it 20 years ago) we were talking about balancing vs not balancing props, putting two prop nuts on four strokes (never heard that one before either, is that common?) and then came this new piece of advice, mount the prop to where it is coming up while the engine is approaching top dead center!? that is what he said that he remembered but wasn't sure if that was the way or not.. anyone know about this?

also the double prop nut came up when i told him about a mishap on monday where my prop came off of my .61 os on my yak mid flight! i had a safety nut on it, i guess that is what it is called, the thing that looks like a small aluminum nose cone? anyway that fell off and i had to basically dead stick it with the engine running, floated in really nice for such a hot flying plane! i have had so many mishaps with this yak it is one of the chinese made cy models or whatever you call them, but its not that big of a deal for what a good price i got it for, just a little more glue and some triangle stock and this thing is a superb plane. first the cowl cracked and fell into the prop and i almost lost it because of that, but the prop finally chewed it up enough for it to break and fall off and i flew it in fine, then the canopy came off and knocked one side of the elevator completely off! now that was a hard one to bring in! then the prop fell off, and today the firewall came unglued before i even got it in the air, thank the Lord that i noticed it while i was taxiing out onto the runway! other than a few small weak spots i have been very pleased with this plane! it is the same plane that nitroplanes sells but i got it cheaper at texasrcplanes.com! anyway, kinda chased a rabbit here talking about safety nuts and props falling off etc. i really would like to know what position to mount the prop in for optimal performance!