Hi,

I have a little problem with my rv4 prom GP. On half throttle it tends to shake in the air. I know its not flutter so it must be something with the engine. The prop is still the same one I used one my previous plane and that didn't give any problems , so it must be the spinner I am using. It's a metal one that I had to cut out so that the prop would fit, my question is how do I balance it?

THX