Bob White wrote:

With a gear reduction,
it would be that much harder for the prop to turn the engine, so you
probably won't get a windmillng prop, which would be worse.
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I ran glide test on my RV6A with a fixed pitch Sensenich metal prop. Could not measure any difference in glide with the prop stopped or windmilling. There is a difference with the engine at idle, but not as much as I thought. It is a big function of your idle speed and prop pitch. With the big pitch on RV's it is hard to get idle low enough. I understand it is really a deal on 9's with the higher aspect ratio wings.

Bernie