Hello FishCanoe,
Yes, the short answer is that Ohm's law gets you fairly close on thrust to start - just as you figured. But there's a catch.... an electric motor can be thought of as a purely resistive load UNTIL IT STARTS TO ROTATE. When it is rotating, the motor simultaneously becomes a generator creating a "back emf" that counters the applied voltage. Back EMF is linear with velocity. So the faster the motor rotates, the more back emf is generated, and your usable voltage is reduced.
After sailing a big tri for years, I sold it and went to a lightweight kevlar canoe with outriggers. For lazy paddling it is powered by an ultralight 1 hp Torqeedo motor which does move it right along. A spare battery provides enough power for an all afternoon cruise. Variable speed, too. I'm not advertising for Torqeedo, but they do make a nice product. There may be others, but I'm not aware of them. Torqeedo also makes a 1.5 and a 3 hp. electric. Nice tools; you might give one a try.
rScotty
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Posted by: roger@chucklebuckles.com
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