The first flight I ever had rolled out nicely, then snapped and just as I got the plane under control and climbing out, the prop came off. It made a nice silhoutte and went it's merry way. Now I use a teflon lock nut and I've never had one back off or loosen up since (although it's not a long time compared to some of you...). You can find 'em in the right thread if you look.

Ed