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sanger22 08-28-2019 01:33 PM

Propeller Identification help
 
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Hello I am curious if anyone can tell me anything about a propeller I have. It’s is a little over 9 feet long and it has curved blades. It was taken out of a barn and looks to be untouched with original finish. There are 6 mounting bolt holes. There are also brass tip covers arhat are held on with many flat nails. The only markings are D9 P7 and NO 175. There are a few pieces missing on the edges of the blade.I posted a couple pictures. Hopefully they came through. I’m not sure of age because of the 6 holes. Thanks for your help. The only thing I was told is that they thought it came off of a very early biplane. After reading the forum the 6 bolts look like it might be made more recently. Thank you

Dbahnson 08-28-2019 06:38 PM

There were not many 6 bolt hubs on “early” propellers, but that primarily refers to WW1 propellers. Prior to that there were some “earlier” props that had fewer bolt holes, even as few as five or four. Yours really has an early look, so don't assume much just yet. I'll try to see if I can find more information.

sanger22 08-28-2019 09:22 PM

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Thank you, if you need any additional photos please let me know

sanger22 08-28-2019 09:30 PM

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A few other photos. Thank you

Mtskull 08-29-2019 11:11 AM

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Does this photo help? Number of bolt holes correct but also the holes on the mounting plate appear to be consistent with the witness marks on the propeller in question.
The photo is of the Shuttleworth Collection’s 1909 Bleriot IX and, although the propeller in question is, at 9 feet diameter, probably too big to be from this type, might it be from a different aircraft using the Anzani engine? Airship perhaps?
Andy

Dbahnson 08-29-2019 12:25 PM

That's certainly a good possibility. I don't know enough about Anzani hubs to say, but the metal hub similarity is certainly suggestive of an Anzani engine. I measured the center bore of this propeller at just about 1 3/4 inches, which looks consistent with this one.

This propeller is for a 125 HP Anzani and obviously uses a different hub, with 8 bolt holes.

Hopefully PMdec will see this and offer an opinion. I get the feeling that it is an early and perhaps rare model.

sanger22 08-29-2019 06:32 PM

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The center hole diameter is 2 inches. The hub thickness is 5 3/8 inches. The hub diameter is 8 1/16. The bolt hole diameter is 3/8 of an inch although difficult to accurately measure. The distance from The middle of opposite bolt holes is 6 1/2 inches.

Dbahnson 08-29-2019 08:17 PM

The best way to measure a bolt hole is to use a drill (or a dowel) and see what size fits best.

Mtskull 08-30-2019 02:57 AM

Quote:

Originally Posted by sanger22 (Post 16770)
The center hole diameter is 2 inches. The hub thickness is 5 3/8 inches. The hub diameter is 8 1/16. The bolt hole diameter is 3/8 of an inch although difficult to accurately measure. The distance from The middle of opposite bolt holes is 6 1/2 inches.

I can’t find a definitive dimension for the hub bolt circle of the 3 cylinder Anzani engine but I have found a drawing which shows the distance between the upper pair of crankcase bolts as 140mm, i.e. a little over 5 1/2 inches. The distance between opposite hub bolt centres is clearly smaller than this, which would appear to rule out my suggestion that this engine may have been the application for this propeller.

sanger22 08-30-2019 06:23 AM

Thank you I will try using a dowel to measure the diameter of the hole.

I appreciate your efforts trying to determine the propeller application. I looked the propeller over really well and I could not find any other markings. I can’t even find where there may have been decals that may have worn off. There are not even any remnants or variations in the wood where the were at one time. Should there have been decals on it when it was new? I appreciate everyone’s knowledge and assistance.


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