When someone has any idea as to why the prop came off, please let us know.

Was it the safety wire? I can't imagine.
Crankshaft broke?
Crank flange cracked? To me, the most likely.
Prop broke?

Back in 2005, on a gear up landing, after inspection, my crank flange was found to have a 180° crack. However, this was not just a normal gear up. I landed. The landing felt hard. I took off again, came back around and landed a second time with the gear up. The plane climbed faster then usual with the Hartzell tips bent.

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Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,700 hrs, N31161, Y47, SE Michigan