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Old 02-07-2018, 11:37 PM   #4
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Join Date: Nov 2008
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I'm guessing from the hub appearance that it fits a Liberty engine, and it's a left hand thread so may have been used on a pusher aircraft of some kind.

If the bolt hole circle has a diameter of 8 inches (i.e. 8 inches from the center of one hole across the middle to the center of the opposite hole) and the center hole is 3 1/16" that would match the Liberty engine. Liberty engines were commonly used by the Navy in its flying boat development in the late teens and early twenties, and many of them were sold off as surplus when they became obsolete not long after that.
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