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Old 11-21-2020, 09:54 PM   #1
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Question A family gift from John Macready....

Hello! Someone in my family has a propeller that was gifted to my great grandpa by John Macready. They were friends/acquaintances. (Iím not sure). The friendship and the gift are certain but family lore said it was from the 1st transcontinental flight. However, after only a teensy bit of research, itís clear it is not. So, I want to know what anyone can tell me about a prop made before 1924 (the year it was gifted). Made of a deep brown wood with no paint or fabric. It does have a flush wide copper(?) edging in a lovely scoop shape on the tips. I believe Functional, not decorative. (Not thin and not far down the blades). It does have numbers imprinted on it. They appear to be C195 or C135 and then either 19 or 13 pressed beneath it. We have no interest in selling it. We just want to know what itís story might be. Thank you in advance for your time and knowledge!
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Old 11-22-2020, 03:39 AM   #2
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Sounds interesting....

Realistically, to have any chance at all of identifying or even narrowing down the possibilities as to the origin of your propeller, some more information is needed, the more the better.

Some photographs would be very useful, ideally showing:
-Full length (front & back)
-Any markings, decals or unique detail
-Close up of front & back and top & bottom of hub.

Also, a series of accurate measurements of:
Length
Hub thickness
Hub diameter
Bolt hole size
Bolt circle diameter
Centre bore diameter

Rgds,

Andy
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Old 11-22-2020, 03:21 PM   #3
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Thank you Andy! I will collect all of that info and post it back here as soon as I go there. Probably next week. I appreciate your answering!
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Old 11-22-2020, 10:43 PM   #4
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Here’s what I found out “The prop is 8’ long by 7 5/8” at the widest part of the blade the hub is 2 1/4” with 8 bolt holes the copper sheathing I believe was done professionally at some later point to be a repair on the crack at the left side (longer and more visible from the back side )“.

first letter is c with a tail on the upper part of the c then a blurred 1? Then95 with 19 underneath and possibly another in the bolt hole?
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Old 11-22-2020, 10:47 PM   #5
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Here are the photos back in the 20s and current day.
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Old 11-23-2020, 03:52 AM   #6
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What the photos tell us so far is that the propeller has definitely been mounted on an aircraft (this may seem like stating the obvious but a lot of propellers were disposed of, unused, in the aftermath of WW1). The hub it was bolted to has left a witness mark in the form of the circle just outside of the bolt circle.
This is useful in that it can tell us the size of the metal hub, which will help determine engine type. If you could provide the measurement of the diameter of this circle then that would be very helpful.

Metal sheathing was a common addition to propellers of this era; it is likely that it was fitted at the factory.

Which part of the hub does your measurement of two and a quarter inches refer to? -In order to progress this further I need the dimensions of:

-Metal hub diameter (as described above)
-Bolt circle diameter (i.e. the distance between centres of opposite bolt holes)
-Hub thickness (distance between the flat faces of the hub)
-Bolt hole size (best measured by trying bolts of a known size in the holes)
-Centre bore diameter.
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Old 11-23-2020, 11:53 AM   #7
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Neat!!! I’ll be there Wed to take them if I don’t get them sooner.
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Old 11-23-2020, 12:59 PM   #8
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All but 2 measurements... others coming. 😁
Attached Images
File Type: jpg 1E7B0FF5-325A-4800-A719-6F9B87083C2F.jpg (91.3 KB, 5 views)
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Old 11-23-2020, 01:01 PM   #9
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Getting hub depth and bolt gauge...
Did you notice it doesn’t have the copper in the pics with the kids? I think the cracks confirm it’s the same propeller though...
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Old 11-23-2020, 01:49 PM   #10
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Looks like 4” hub depth and 3/8” holes but possibly metric on all
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