Not sure what you mean by "windmilling" but suspect you're talking about the wagon wheel effect Archived Message
Posted by sashimi on March 17, 2023, 8:51 am, in reply to "Re: Simplicius: SITREP 16 March 2023: Reaper Developments And Major Advances"
That's an optical illusion where the apparent rotation of the spoked object appears to rotate differently (speed and direction) from the reality. The rolling shutter causes skewing of objects. It can be seen in car/bike races where vertical structures (stands, flagpoles) appear as diagonals.
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