0richard4872 6 years ago ReplyUpvoteWe are using basically a belt driven modular gear reduction design utilizing the pulleys sets in our donor vehicle as an example for our wind turbine. We are mounting the alternator on a custom bracket parallel to the prop pulley and using a belt to feed the alternator. We ordered a set of power pulleys like they use for drag racing that allows for more rpm at alternator when the crank is at idle. What we like about the design is when the alternator eventually fails, which it will, instead of having to dismantle the prop assembly, we will simply remove the alternator from its mount, put the power pulley on the new one, and replace it. According to our calculations, when the prop is at 1800 rpm the alternator should be at 3000 rpm + or -. We are having the alternator custom wound out a local armature shop. It should produce 200 amp at 14.4 volts while turning at 3000 rpm. I will try to post pics and results as we proceed.