I have the Modeltech Formula 3D and I noticed yesturday during a small flight that the elevator was shacking real bad so I had to back way off on the throttle . I have elevator supports and this obviously didnt help that issue at all , can anyone else give me advice on this issue ? OH to let you know , Its not the elevator parts that move , its the structure of the plane thats doing the shaking from what I can tell .

Thanks