For all of those that like to stand in front or besides your propellers when you do a run up should seriously consider discontinuing that practice.

The other day I was out testing props and a new smoke oil home brew. During this testing the third prop completely exploded, pieces went right, left, up, forward and down. I was standing behind the plane and had just advanced the throttle when the sh$t hit the fan. It was a brand new prop that was balanced and only had a couple of flights on it.

I was using the center retaining nut on this particular 116 cc engine, so no prop bolts or drilling could have lead to this mis-hap. The prop ended up in many little long dagger like pieces.

After the prop let loose that engine sounded like a cox .049 leaned and screaming.

Luckily no one was at the field at that time and I was not in the direction of this flying shrapnel. This only reinforces the reason I never run an engine up in front or besides the propeller.