View Full Version : Stone Propeller (I think) found in my garage possibly an unairworthy one

10-09-2017, 06:03 PM

I found what I think is a stone propeller from the 1940's. I think it might be one of the ones that were made to not be airworthy, on the back by the hub it is stamped letters THY. Assuming this may be part of the not airworthy designation.

I'd like to find out and details about this propeller and also what it might be worth if I sell it

Any input would be most appreciated

10-10-2017, 07:59 AM
I think you're right about the non-airworthy stamping, which was there but then got removed with the routing out of the hub for a clock or similar display item. I doubt that it was intended to be unairworthy, but more likely got rejected in the manufacturing process or on return to the manufacturer for repair. (If the rear of the hub shows "witness marks" created by indentation of the metal hub then it's a sign that it was mounted and used at one point in its history.)

It's a very "typical" low horsepower prop potentially used on a variety of aircraft that were powered by a Continental A 65 (or similar) engine.

To a collector it's nearly worthless due to the highly visible hub alteration. To someone who has a clock that would fit in that space and who likes a clock display it's worth a little more, but it's not particularly valuable. (Personally, I'd just put it on eBay with no reserve and see what you get. At least the blades are in good shape.)

10-11-2017, 09:15 AM
HI, I may be interested in purchasing your propeller. I can be reached at msprior02@gmail.com
Thanks, Scott