Many eboat sailors use fixed props instead of folders, and simply adjust the drive for basically zero drag and minimum power, and this will usually be somewhere between 50 and 75 watts. No biggie if you have plenty of solar available. With folding props you can't charge batteries via regen, though this is not really a big deal since it takes several days of sailing at around 8kts+ to charge even a moderately sized bank, typically. As for size, that sounds about right though you can match a wide range of props by simply changing the reduction ratio with a different pulley or pulley pair. Eboat guys usually favor a large, moderately pitched prop turning at lower speeds as this is inherently more efficient than a smaller, faster turning prop. You do want at least an inch and a half clearance with the hull, though, so that's a thing.
Most motors have a rpm constant listed, giving the ideal full power RPM per volt. So, you can calculate the ideal full power RPM and tailor the reduction to give it at full power output. This is perhaps less important for a water cooled system but for internal fan cooling, you don't want the motor turning too slow at full load.
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