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Old 03-14-2020, 09:02 AM   #14
twistedtree
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City: Vermont
Join Date: Jan 2013
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What you are describing is a prop shaft generator. Google that and you will find a variety of solutions for sail boats looking to generate power off of a freewheeling shaft while under sail. Some are packaged products, and some are home brewed. But they have all addressed the gearing issue in one form or another.
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