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Old 07-30-2017, 04:42 PM   #10
Join Date: Jun 2017
Posts: 6

I heard back from the National Air and Space museum curator and he couldn't track the whole numbers and identification of the propeller but with the lead plate and balancing pieces, repair mark on one and the brass plate covers and the nail scratching of "Eng Side" he said he was very sure that these were used as propellers but redirected me back to this web page because of not having the resources to go through their archives.

I found another marking but it is hard to make out. It is a circular stamp and says USP or USA(it's slightly damaged) and below it looks like three numbers but I can only make out what I think is an 8. I've attached a rubbing of the numbers and stamp as they are together on the prop. Any idea where I might start doing some research on left hand pitch props? Still curious to do some more digging on these.
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Last edited by Mike; 07-30-2017 at 04:57 PM.
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