I’ve got 2 -18” props. When the motors aren’t on I’m regenerating. I also have brushless motors which are low drag and direct drive to the shaft, no belts or other stuff adding to the drag. With that said, yes there is a loss, an average of about 1 knot. “Very much” is relevant to your speed. I do a little over 50% of wind speed and admit I have a lot to learn about sail trim. However the regeneration of power while sailing makes it worth while. As to larger than a 12” prop I would think drag would be slightly more to negligible. The thing I never understood, because it’s an argument against e-drives, if you got a prop in the water on a diesel it creates the same drag if not more do to the sail drive so why would that figure into the equation?
Steve in Solomons MD
Does a larger prop create more drag when the e motor is not on? And will this slow down a sailboat very much?
JC
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