68 and 32 markings. I picked this up off Craigslist several years ago and never researched it. I'm not an aviation guy so this will probably be sold to someone who is. The backstory is a lady was cleaning out her deceased husband's shop/barn and he was a former helicopter pilot. I'm in central SC. Thanks in advance
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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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