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Old 07-22-2016, 12:52 PM   #1
RickJ
 
Join Date: Jul 2016
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Default Early propeller I'm looking to ID

Hey everybody,
I joined in hopes to get some information on a prop that I've waited 20 years to buy. I could not find a make on it and some of the information is not very legible. Obviously I'm not going to take any type of cleaning products to the finish of this prop to read the information. I hope somebody can help me out with the information I can provide. Any help as to what make it is and what aircraft it possibly went on would be greatly appreciated!

Overall length 104-1/4"
The center bore is smaller in the back at 3-1/8" diameter and 1-1/2" deep. It measures 4-1/8" diameter by 2" deep at the front and it looks to be hand chiseled. The back is not round but squared off, I'm thinking it locks into something or a second propeller maybe?
Bolt centers 8"
The prop itself reads:
SE364-380
CP67662LH
The parts that are barely legible look like they read:
275-7
H9X 88
There's a set of numbers under the H9X but I cannot read them.
Please see attached photos. I can only upload one at a time so I will have to make a couple more posts.

Thanks again for any help!
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Old 07-22-2016, 12:55 PM   #2
RickJ
 
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Back side of prop with squared center.
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Old 07-22-2016, 12:57 PM   #3
RickJ
 
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Close up of some information.
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Old 07-22-2016, 01:03 PM   #4
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I have more pictures if needed.
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Old 07-22-2016, 04:14 PM   #5
Dbahnson
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It's half of a 4 bladed combination most likely for a Liberty engine, hence the notching as you surmised. The "SE" prefix stands for "Steam Engineering", the Navy department that was responsible for procuring propellers for their flying boats during the late teens and early twenties. The "CP" prefix stands for "Curtiss Propeller" as was assigned to the company by the Navy, I believe, or possibly some other governmental agency.

The hub has been chiseled out, presumably for a clock or barometer.

A close up of the markings would be the most useful thing to have at this point. Sometimes they need to be deciphered if they are hard to read.
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Old 07-22-2016, 07:28 PM   #6
RickJ
 
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Thank you for the info! I went out to the barn and took my flashlight to it for some pictures and I believe this is what the markings say:
P6556
88 X5H or 88 X5II
There is one other small marking I will attach as well.
Thanks again
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Old 07-22-2016, 07:30 PM   #7
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Small symbol under id.
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Old 07-22-2016, 09:29 PM   #8
Dbahnson
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Quote:
Originally Posted by RickJ View Post
Small symbol under id.
That's "Curtiss Propeller", followed by a design number, followed by "Left Hand" ("LH"), which indicates the direction rotation to provide forward thrust. In this case it likely points to a pusher (rather than tractor) configuration.

I might be able to track down the CP number when I get home and can look through some reference materials. No promises . . .
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Old 07-22-2016, 11:28 PM   #9
RickJ
 
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Thank you for the info you've given me so far. Is the SE364-380 a serial number?
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Old 07-23-2016, 07:30 AM   #10
Dbahnson
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That's most likely a "drawing" number, referring to the blueprint from which it is manufactured. So it's really more like a model number.
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