When I broke a blade one day, the tip of the blade put a small hole in the side of the cutter. I had to beat it back into shape.
I hope I don't do this for a while... My RC2072 is brand new and I already put a sizable dent in it. 10-15 acres of my property has rocks by the thousands sitting right on the surface. I got a rock bucket coming to make a dent but it will take a while.
I can't imagine what a broken blade flying at mach 2 would be like... Good reminder of safety for me.