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-   -   I need help identifying a WWI prop (http://woodenpropeller.com/forumvB/showthread.php?t=2505)

Rjzac67 02-03-2013 12:30 PM

I need help identifying a WWI prop
I have a wooden propeller that I have been told is from WWI.
There are some markings on it. I will post pics of the prop. The markings are
6 65, F.C.R., 9 -6"x 5 0 0, P.P ___ R.H., TYPE 91-H

Any help would be much appreciated!

Dave 02-03-2013 01:55 PM

The "P.P." probably refers to "Paragon Propeller" and the number that follows should be the design number.

Is the hub notched?

Pictures should help, but there are LOTS of possibilities.

Rjzac67 02-03-2013 08:50 PM

Picture of markings
1 Attachment(s)
Here is a picture if some of the markings on the propeller

Rjzac67 02-03-2013 08:53 PM

1 Attachment(s)
More markings

Rjzac67 02-03-2013 09:00 PM

1 Attachment(s)
A picture of the hub

Rjzac67 02-03-2013 09:03 PM

1 Attachment(s)
Pic of the whole prop

Bob Gardner 02-04-2013 05:36 AM

I can't identify it. I'm sure our American experts will be able to. My speciality is British and German props, not American props but there are two distinctive aspects to your prop. The diameter of 9ft 6ins with a pitch of 5ft 0ins is towards the outer limit of prop design and suggests quite a powerful engine in a comparatively slow moving aircraft; perhaps a bomber; possibly a dirigible.

The angular shape suggests a prop designed by Dashwood Lang, which hints at a prop used by the USN.

But you shouldn't pay too much attention to my view. I'm rather going out on a limb.

With kind regards,

Bob Gardner

Dave 02-04-2013 07:52 AM

Your next step is to go to this page for information about hub dimensions, then go to the linked page listing dimensions of various hubs. Many propellers with that size and shape were used on a Liberty 450 HP engine, which looks like yours would fit but you should check and be sure that they are not consistent with something else.

I am not familiar with an aircraft type of "91 H", but I'll see if I have any listings of the "P.P." drawings at home.

Is the rear of the hub notched, or is it flat like the front shown in your photo?

Bob Gardner 02-04-2013 05:24 PM


Do you think the device on the top right of the post dated 0153am might be a USN anchor?


Dave 02-04-2013 07:50 PM


Originally Posted by Bob Gardner (Post 9852)

Do you think the device on the top right of the post dated 0153am might be a USN anchor?


Yes, I do, but also you'll love this. I think it's stamped "H 16". Notice how the "1" itself looks upside down . . . Not unlike some other props we've seen, the guy hired to do the stamping got it a little wrong. ;)

For the OP, I think yours is a variant of this prop produced by Matthews Brothers, but yours was manufactured by the American Propeller Company (Paragon).

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