What happened yesturday with my engine was I landed the plane and the wind pushed it off of the landing strip. We have about a 6 to 9 inch enbankment on our new field and since it was all the way at the end of the runway, I thought I could just run the plane up the embankment and I should be good to go. Well, I gave it the nuts and it went up the embankment, taking a bunch of gravel with it. I then proceded to take the plane off again, once it was in the air I new instantly that there was something wrong with it. I brought it down and shut it off and noticed the propeller. So I didn't think anything of it, went to the LHS and picked up a couple propellers. Put one on it last night to run out the fuel and the vibration was still there. No I haven't taken anything apart, I have just taken the engine off of the model to take a better look at it. If I can't see anything wrong with the crank, I'll check the prop. I don't have a prop balancer yet so I'll have to figure something out.

Any other suggestions would be great. Before I took the engine off the plane I didn't check to make sure all the straps holding it on were still tight, that could most definatley been an issue after hitting the gravel like I did. So before I take the engine apart, I'll check all the things mentioned and see if it is simply a out of balance prop, engine not tight on mount, or bent crank.

Thanks all!