Had minor nose in with Multiplex Mentor and bent the prop shaft so I replaced it. Went out to do a run up test on the prop and at 1/2 throttle, I get a heavy vibration that shakes the whole plane.
The prop is spinning true. When the prop stopped, I grabbed the spinner and was able to wiggle it up and down maybe a 1000 th of an inch. Should there be any slop in there?
I was thinking that maybe a bearing got damaged because I am starting to hear the beginnings of a grinding noise at certain points of the prop rotation when spinning it by hand.