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Old 03-07-2019, 03:29 PM   #2
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Join Date: Nov 2008
Posts: 1,065

The numbers almost certainly refer to the diameter (68 inches) and the pitch (32 inches) but they don't identify the use.

In order for it to be used on a certificated airplane (one approved by the FAA) it would have markings indicating a design number or a Type Certificate number. I suspect that it may have been designed for an ultralight of some similar non-certified aircraft or airboat.
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