[quote=Edchris177]You won't get the speed that you do while under sail, but if that's not important, 45lb is more than enough.
I picked up my Nacra 5.7 on a miserable cold windy Dec day. It was manhandle everything up a cliff, or get it several miles to the nearest boat launch.
I strapped a 2x6, with a 2x4 nailed to its edge across the transoms, & mounted the cheapest trolling motor available, about 30lbs thrust IIRC.
A cat has little resistance, I could do an estimated 8-10 mph. You need to be able to place the battery up near the mast for better balance, (or a long tiller to get yourself forward), if all the weight is in the rear, the bows rise, wind grabs the hulls & makes steering difficult. I didn't have a tiller extension, or the use of one rudder & it was a chore.
As MN3 says, deep cycle batteries are heavy. I brought both batteries from my stinkboat, but only needed one. Of course if you only use 1/2 throttle you quadruple battery run time.[/quote]
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