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for what it's worth
on my cal' 27 the only motor i had last summer was a 47# thrust whisper guide (and a long paddle)
i could cruise aprox 3 knots without the wiring getting hot to the touch. into the wind went ok, up to 10+ knots, then i had to get the paddle out. i think our boats are probably about the same drag. mine is a 27' poptop disp. 5500#
unless you actually need to get to hull speed, against wind and current, i think any motor with 1+ hp should be enough, especially if you can play with prop pitch/size at all.
have you thought about regen/recharge under sail?
i'm looking foreward to seeing progress
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