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Old 02-03-2013, 01:30 PM   #1
Rjzac67
 
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Default 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!
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Old 02-03-2013, 02:55 PM   #2
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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.
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Old 02-03-2013, 09:50 PM   #3
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Default Picture of markings

Here is a picture if some of the markings on the propeller
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Old 02-03-2013, 09:53 PM   #4
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More markings
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Old 02-03-2013, 10:00 PM   #5
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A picture of the hub
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Old 02-03-2013, 10:03 PM   #6
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Pic of the whole prop
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Old 02-04-2013, 06:36 AM   #7
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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
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Old 02-04-2013, 08:52 AM   #8
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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?
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Old 02-04-2013, 06:24 PM   #9
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Dave,

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

Bob
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Old 02-04-2013, 08:50 PM   #10
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Quote:
Originally Posted by Bob Gardner View Post
Dave,

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

Bob
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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