[rotorwrench]

I have several aircraft engine starters that were broken apart due to engine kick back. The aircraft have a starting aid that allows for retarded ignition timing of one or both magnetos for starting but now and then the starting aid or aids will die and cause kick back.

The term Ford fracture was coined from people who didn't retard the timing for one reason or another and the hand crank will give them the jolt of a lifetime if they aren't taking precautions against possible kick back.