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To the best of my knowledge there was not a production Hamilton Standard 4 bladed counterweight type propeller.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.
Hi Larry,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.
OK, thanks. In the files on my computer I renamed the those 2 pictures; one is now called Hub counterweight end, the other Hub engine end. But I don't see a way to rename a posted photo (or remove one once posted). If someone will tell me how to do that I will rename or exchange the 2 I already posted.
So there is agreement that this prop hub is basically an H-S design, but likely a variant built by a licensee. DeHaviland, and a Japanese company (???) were licensed to build Hamilton-Standard propellers. What attribute would tell us who actually made it? From there, perhaps we could make it to the museum end goal, which is to know what aircraft it was used on. I know that numbers would be a big help. Where on the hub would numbers most likely be placed? Where did H-S put them on the props they built themselves?
Thanks,
Larry
It is too many years to be certain but my memory is there are numbers stamped on the rear face of the spider but I cannot remember where on the hubs halves.
I would suggestMichael Hope is the best source for this information as he can almost certainly provide you with photographs of where these markings are on HS (and probably dH) hubs and spiders.
Once you have a working area I would suggest MINOR cleaning with something like hand held scotchbrite and if that shows nothing then I would suggest you talk to your local police. They have the means to find serial numbers that have been ground off guns, engines, etc, and might accept the challenge when next doing training.
Ham Std are still around and maybe you could send their Customer Service people the photos and ask if they ever made 4 blade CW props and if not do they know of any other manufacture that did.
I doubt that these will need such extreme automotive type methods. I have stripped many engines and prop parts upto 85 odd years old in the ground and often, larger bolt threads survive well after disassembly. However, each relic has its own condition. Sometimes, complete bolts will have disappeared, it all depends on the materials and the type of environment the parts have been in. Although the steel hub is quite corroded in this case, some of the bolts look fair and I would expect some good threads survive in there.Or a nut buster. Sacrifice the nut to see the threads.
Or a nut buster. Sacrifice the nut to see the threads.