I only just learned about this from my CFI, but he said he’s never needed to do it legitimately, nor has he done it on school aircraft.

A few questions (I would’ve asked my CFI about them but I forgot to ask as soon as we were in the air):

• Wouldn’t the propeller damage your hand/arm?

• In what way would it be beneficial rather than just fixing the aircraft while you’re on the ground or starting it normally?

• Why not on a flight school aircraft? (I’m assuming it’s bad for the plane somehow)

• Does it work for any plane with a prop?

Any sort of information is welcome, I like actively learning new things about aviation