The Motenergy 12kw ME1306 is good. It is an updated version of the ME0913 which I have used. A very robust motor that tolerates up to 96v but chugs along cheerfully at 48v too. There are a lot of vendors that handle this motor. Just pick one. Eenie Meanie Miney Moe. Or price compare. I got my 0913 used on Fleabay. You COULD use a 5kw motor such as the ME0907 or ME0201014201 motor but that's really a bit small for any displacement sailboat hull over about 26 foot. Baldor makes some nice little cast iron enclosed reduction gearboxes and I think I got mine from https://www.electricmotorsport.com/. A belt drive is more flexible, though, as you can change the reduction ratio by changing pulleys. Grainger or McMaster-Carr for pulleys, hubs, bearings, shafts, keys, etc. There are some prefab belt drive units but they look kinda flimsy to me and maybe a bit overpriced compared to DIY. For controllers I find the sine wave units from Kelly to be quite satisfactory. You can change the configuration yourself, with no special equipment, just a rooted android device or a WinDOHs computer. Unforunately they don't think Linux is a thing, and so there is no configuration app for Linux. I use 2/0 welding cable because it is flexible and easy to work with. Don't go lighter than that, is my suggestion, especially with low (48v) voltage.
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