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Old 02-18-2017, 10:08 AM   #2
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Join Date: Nov 2008
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I think it's a Sensenich propeller, even though it doesn't show up on their model listing page, but I also think it's an oddball of sorts. Out of all of the Sensenich models only 2 of them are 83 inches. The "ATC586" is the Type Certificate number, which appears on quite a few of the Sensenich props, but does also appear on the only 83 inch model.

The suffix number (indicates pitch) must be 66 since the type certificate range begins with 67" and goes down to 58". A pitch of 66" would be considered "coarse" for that model and more likely used in a cruise (vs. climb) type of performance.

See the attached page at the bottom, where it shows an 83AA model. I notice that the hub dimensions are similar to the other TC586 models except that it is 5 1/4 inches thick. The #3 footnote indicates that the approval expired in 1956, but the serial number is consistent with a manufacture date between 1932 and 1942.

So my opinion is that it was manufactured by Sensenich but that it was made in very low numbers, perhaps for some special usage. I doubt that you can identify it further, but you might try contacting Sensenich directly.
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File Type: pdf Sensenich.pdf (801.2 KB, 3 views)
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