While my Dad and I were testing his new supertigre .46 engine on his home made engine test stand (a piece of 2x6 with a hole cut out for an engine clamed on to a workmate) the engine along with the 2x6 vibrated loose and shot forward in our garage. The prop and spinner got busted into many pieces and the prop nut and washer flew off. Luckily we were standing outside of the garage and no one got hurt. Only half of the backplate was left on and the engine was still going. Oh yeah also the screw right next to the carberator flew off to. we managed to find every thing after a bit of looking. pics were taken after we found every thing.