"Doug Palmer" wrote in message


I would look at how the video camera compensates for the lower light
level in the cloud. If it changes its scan/shutter rate it would
cause the apparent change in relative movement of
the propeller. ... What you are witnessing is the sync of the prop
with the shutter and any variation in either can cause the illusion of
movement.

That's my guess, as well.

--
John T
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