What is this?
 

Does anyone know what kind of propeller this is and, more importantly, how one would go about determining approximate airworthiness?

That's not a prop, it's a ceiling fan. And you're supposed to install it on the ceiling, not the floor. :)

It looks a little like an aeromatic prop?? Not exactly - maybe something similar.

See
www.aeromatic.com


Thomas
-8 ailerons

The hub looks a little funny (maybe an old design) but it looks all the world like a GT propeller. It'sa little'a company in'a Italy (I'm Italian so I'm can poke fun :)

If no one chimes in over here with a better guess, give these guys a try:

http://www.gt-propellers.com

I'm probably totally wrong, so good luck.

Personaly, I'd turn it into a clock and advertise it on e-bay as:
"Authentic Propeller Wall Clock, Not XBox 360"