More Requa-Gibson information

[chuckpee]

Thank you for helping identify our early Requa-Gibson propeller. I would appreciate more information, such as the meaning of each item in Line 2 (P17 D70 P80 c). It measures 7 feet (84"), so may I assume D70 means 7.0 feet? Which of the “Ps” is pitch…and the other? The small “c”? Regarding the metal “sleeve” insert (pic). Is this normal?
I want to display it, but there is some tip damage. After reading Bob's message about restoring, I should refrain from any serious “restoration” - but what about a light cleaning and maybe gluing the split?
Thanks in advance...

[Dbahnson]

Generally, on most propellers the diameter is listed first, followed by the pitch, but that's not to say that it was as standard early on when this one was presumably manufactured. A pitch of 80 inches would be very coarse, while a pitch of 17 inches would make the blade almost flat when looking at the angle of pitch. I don't know the method to calculate it mathematically, but assuming that one of those "P"s refers to pitch then if you post a photo of the blade as seen from the side, we should be able to tell "coarse" from "fine" I think.

I don't know about the small "c", nor the metal sleeve. Neither is common.

I definitely would not glue the split, but a light cleaning is OK as long as you aren't too aggressive. Bob recommends high quality beeswax, which should help protect the surface.

[chuckpee]

Thank you for the advice. Hopefully these pictures will better show the pitch. Let me know if you need more.