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This an image of Hamilton Standard pitch change cams for a 23E50 type propeller, taken from the Hamilton Standard Illustrated Parts Catalog 143. The cams in the original post do not show have the required hole for the cotter pin to keep the cam nut locked in place. Plus the Hamilton Standard cams have more lightening holes to reduce weight. Also the outer cam has a different dome shelf with a different hole arrangement. This is why I believe that these would be a copy of the Hamilton Standard Hydromatic type not a genuine item.
The appear to be the cams from a Hydromatic type propeller. I do not think they are Hamilton Standard
The candle holders are probably from an HS prop, but they look smaller than the 23E50, of which the diagram is from.
The 22D30 and 22D40 Cams had a row of ball bearings holding the cams together so these are not those, so no threads.They look D shaft to me also but I cannot think of a reversing D shaft HS installation and I am fairly sure that cam profile is feathering and reversing. With no dimensions tho we are both guessing unfortunately.
Off the top of my head the only D shaft feathering prop I can think of is the 22D30 on the Beech 18/C-45 series. Unless the Volpar conversion had reversing props I doubt any of that series had them.
Thanks. I thought the DC-4M would have used 23EX spiders and hubs like the Canadian Hurricane and Lanc and I was surprised they used D hubs.The 22D30 and 22D40 Cams had a row of ball bearings holding the cams together so these are not those, so no threads.
The D shank propellers did have reversing features, in the 43D50 and 43D60 series propellers series. The size of the cams was the same as the domes were the same size, so the cams were the same size. Aircraft in Canada that did use them were the DHC-4 Cariboo, and the Canadair DC-4M and C-5.