Good point, but I still think that the OP is seeing an optical illusion.

Bob

wrote in message
...
Bob Gardner wrote:
I think what you are seeing is an optical illusion. The prop speed
doesn't
change because of the air it is penetrating.

It may be an optical illusion, but engine RPM for a fixed throttle/mixture
setting will most definitely change because of the air, otherwise there
would be no reason to have a mixture control.


--
Jim Pennino

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