"Bashir Salamati" wrote in message

Take wood dowl, an aluminum rod, and a piece of carbon fiber/epoxy
composite.
Suspend from a string. Tap each with a small hammer. See which one rings
longest.


Hmmm...a very interesting thought experiment.

It is obvious that the aluminum would ring like a bell, the composite might
ring a little, but not much, and the wood would go "thunk". I had not
thought of it like that. I'm not sure how much of this result would apply to
the propeller situation but on the surface at least you seem to have a
point.

I'm going to have to think about that...