Hi, Cheli

Yeah, the 4 cycle engines shake, all you can do is make sure the prop is balanced, and if you have a Saito, or O.S. check the muffler nuts to make sure they are tight. I actually detest the Saito muffler arrangement.

I have also heard the gear plate in the ARF's is very weak, but guess I've been lucky so far I have over a hundred flights on my Twist and no problems. What I do now with the ARFs is to buy a Dubro composite gear and attach it with substitute 10-32 nylon screws for the metal ones.