Hello,

I have a vibration problem on my 4-star 40 (magnum 46) when my throttle is 1/3-1/2 throttle. It occurs both in the air and ground. I have held onto all of my control surfaces to see if it was some sort of flutter and it is not. It is noticeably loud, and I can see the muffler vibrating (it visually gets fuzzy).

What are the possibilities, and how should I test for them?