The other day I was out flying my Hangar 9 Alpha 40 and got it landed fine but coming down the runway (from the far end) I hit a dip or hole and it nosed my plane over and pushed the prop into the ground. It broke a blade off of the 3-bladed prop and the vibrations caused some damage before I could shut it off. The biggest trouble I having fixing this is the prop. When I put on the new (or old; tried them both) prop and all the other stuff (according to the "prop intallation" sheet I have) and tighten the nut on the end, it locks everything up to where the crankshaft doesn't turn. The flywheel ([link=http://www.horizonhobby.com/Shop/ByCategory/Product/Default.aspx?ProdID=EVO100219A]http://www.horizonhobby.com/Shop/ByCategory/Product/Default.aspx?ProdID=EVO100219A)[/link] is rubing against the crankcase and locking everything up. What could cause this? It looks like the olny thing that could have happened would be that the aluminum piece inside the steel flywheel (pic in link) could have been pushed in. Do you think that is the problem? Also, I noticed that the engine is not setting on the mounts straight. I never noticed this before. Is anyone familiar with how the engine is suppossed to set on the mounts in this particular plane? The engine is just hold in with a clamp type mount, rather than screws going through the case, so i though it could have shifted. Thanks a lot. I will call Horizon about it later today and see what they say about it.