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Old 02-24-2011, 05:37 PM   #1
princefritzfirst
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Default BIG prop and a huge mistery - PLEASE HELP!!!

Sirs,

I'm writing you with a question and asking for a huge favor/advice.

I recently purchased the propeller pictured below and can't in any way figure out what it is and where it might come from - absolutely nothing! If possible at all, I would like to ask for your expertise in trying to figure out what this might be. As you can see from the pictures it has no markings on it what so ever, the finish is very worn out as if it sat in the sun for a very long time - it was purchased in Los Angeles, and that might be a clue to that part.... Other than it looking very nice and worn out it tells me nothing. Would you be able to help me out and determine, from the pictures and dimensions, what this might be?

I really appreciate any help/advice you can give me.

Thank you very much and I look forward to hearing from you.

Regards,
David

- screws 9/16" or 14mm.
Attached Images
File Type: jpg prop 1.jpg (19.5 KB, 34 views)
File Type: jpg prop 2.jpg (73.7 KB, 16 views)
File Type: jpg IMG_2815.jpg (53.3 KB, 23 views)
File Type: jpg IMG_2820.jpg (64.9 KB, 20 views)
File Type: jpg IMG_2818.jpg (76.1 KB, 22 views)
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Old 02-24-2011, 05:52 PM   #2
Dave
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It looks similar, but not necessarily identical, to the "toothpick" style propellers used on the OX5 powered aircraft in the late teens and twenties, such as the JN4 and the Standard J1 (also powered by the Hall Scott engine). The next step is to carefully measure the hub dimensions and compare it to the chart referenced on that page.

It's nice that the metal hub is intact. It might be reasonably valuable if it's an original OX5 hub, although I'm not sure how much those are worth.
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Old 02-24-2011, 06:48 PM   #3
princefritzfirst
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Dear Dave,

Thank you so much for the reply.
I've just done the math and it does point to the Curtiss OX5 measurements except for the center bore, if I'm doing it right, which comes out to 2" not to 2.690". Is the center bore measured on the outside? If yes then it's 2".

So, from all the other numbers given below it seems like it's the OX5 - what do you think? What can you recommend I do to be 100% certain? (I wouldn't want to disassamble the hub if you think that might ruin something or make it less valuable historically....??)
As you can see the finish is completely sun burned...

Thank you very much for your help!!!


- hub thickness: 4"
- hub dia.: 6"
- bolt size: .375
- bolt circle: 5.250

Regards,
David
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Old 02-24-2011, 07:06 PM   #4
Dave
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If you're measuring the diameter of the metal hub it won't reflect the charted measurement of the center hole in the wood. My guess is that's the correct diameter for an OX5 engine and that the prop was used on something powered by that engine, possibly a Jenny.

Personally, I'd leave the hub where it is and not try to improve the finish except perhaps by waxing it. You can only decrease its value by making attempts to improve its appearance.
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Old 02-24-2011, 07:09 PM   #5
princefritzfirst
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Thank you so much!
I've read the "restore" post so no. I would not want to do anything to harm the way it looks now.
Can you recommend any waxes?
What value would you personally put on this propeller?

Thanks!
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Old 02-24-2011, 07:20 PM   #6
Dave
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It's hard to know value in the present marketplace, and I have no idea what the metal hub might be worth, but something in the $1000 range wouldn't be surprising, despite its rather rough condition. Just a wild guess at this point, however. The market is not very large.
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