I've thrown props. Luckie I was to standing a little bit behind and to the side and didn't go WOT.
Never that less the props and spiner still took off.
As a matter of fact it was the third tank of trying to break in an engine.
As a matter of fact i think it was a wooden zinger.

It's was bascailly from the electric starter torquing it loose.
I think I might had flooded the engine too, before hand.
New engines are tight at TDC