Although I spent some time overhauling 23E50 and 4HF props back in the sixties, and maintaining 23E50 props since, I have learnt more on many aspects of those props on this thread than I did in all that time.

I have a couple of questions for the multiple experts in the thread. 

Does anyone know what aircraft type(s) dH prop blade D40550A was fitted to?

The blade, less turning gear, is 76 inches long so adding the 2.8 inches distance from the centreline of the prop we end up with a prop 13’2″ diameter (+/- and inch as diameters are measured to the next full inch).

Secondly am I correct in assuming that the serial number of APR1941nnn indicates the nnnth dH blade manufactured in April of 1941?

Thank you