Interesting project. Thanks for sharing.
I use a Haswing Protruar 1.0 motor with an APC 11x6 tractor prop. I figured out that I could mount the control head backwards, so the prop is facing forwards. I added a spinner in front of the prop to minimize drag. The only noticeable drag now is from the vertical shaft. I typically run the motor at about 50% power, about 300W, giving 3-4 knots boat speed (multihull, some drag). I only notice cavitation if the water gets quite choppy.
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