Prop Parts at FAAM

Michael Hope · Feb 13, 2025

Engineman said:
Hi Michael,

Certainly looking that it is a 4-blade H-S CW type hub. Can you tell us any more about that 4-blade type prop or copies?

Cheers

Eng

To the best of my knowledge there was not a production Hamilton Standard 4 bladed counterweight type propeller.

Hamilton Standard did license the build of their design to de Havilland.

The Japanese also had an early license to build copies of counterweight propellers.

Engineman · Feb 13, 2025

Michael Hope said:
To the best of my knowledge there was not a production Hamilton Standard 4 bladed counterweight type propeller.

Hamilton Standard did license the build of their design to de Havilland.

The Japanese also had an early license to build copies of counterweight propellers.

Thanks Micheal,

I guess the Jury is still out on this.

Cheers

Eng

Larrythepilot · Mar 12, 2025

I'm back. Sorry for the delay. I was in Florida for a couple of weeks. I'm having trouble getting caught up.

I asked the two guys working on the prop hub and spider to clean them some more, and look again for some sort of markings or numbers. They did the cleaning, but no markings or numbers have been revealed. They took some more pictures; this time with a measuring tape held near the items. Now you can tell relative, and (approximate) absolute size. They also sent along the information that the 4 nuts on the bolts that hold the halves of the hub together are 1-1/2 inches across the flats. Someone in the thread asked if the spider came out of the hub. We don't know. The spider was not in the hub when we discovered the parts in our "dig room". I guess we can't be certain that the hub & spider are a set, but we have always thought they are.

Michael Hope · Mar 12, 2025

In my opinion, these parts belong together. In the images below that I copied from above, I have marked the location of what I believe to be grease fittings, and the corresponding holes in the barrel halves. The sizes do sort of match. As I have previously said I do not know of a production propeller from North America that matches this propeller.

Engineman · Mar 12, 2025

Larrythepilot said:
I'm back. Sorry for the delay. I was in Florida for a couple of weeks. I'm having trouble getting caught up.
I asked the two guys working on the prop hub and spider to clean them some more, and look again for some sort of markings or numbers. They did the cleaning, but no markings or numbers have been revealed. They took some more pictures; this time with a measuring tape held near the items. Now you can tell relative, and (approximate) absolute size. They also sent along the information that the 4 nuts on the bolts that hold the halves of the hub together are 1-1/2 inches across the flats. Someone in the thread asked if the spider came out of the hub. We don't know. The spider was not in the hub when we discovered the parts in our "dig room". I guess we can't be certain that the hub & spider are a set, but we have always thought they are.

Hi Larry,

Good to see progress. Unfortunately I have no good info on this, other than having looked around about it. It strikes me that this is a HS style "Bracket" prop hub, comparing it with the info about the 3-blade type and copy's! However, if HS did not make a 4-blader, could this be a Japanese development?

Cheers

Eng

MiTasol · Mar 12, 2025

Or German? Or Russian?

I doubt German tho because so much data is available on the German material so it is less likely that no one on this forum has ever heard of it.

Prop Parts at FAAM

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Michael Hope

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Engineman

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Larrythepilot

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Michael Hope

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Engineman

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MiTasol

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