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Reynolds does not predict flight performance per se, but yes, you can lighten a human-powered aircraft enough to support its own weight and hang together at 3MPH. Models do it. Wings are often tested at 3,6 , and 9 million Re, and the data curves are quite similar. The forces scale strongly with speed, but the details just change enough to make it worth checking. It is mostly about how much the shape is getting padded out with sticky air.
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