Hi Lee,
Thank you for the reply, and it is not at all rambling. My boat is 6000 lbs, so 3 American-style tons, 27' long and about 8' beam or less at the waterline. The 30' sailboat you mention requires 500w for 2-3 knots, so it appears to be consistent that 5 knots in my lighter, although shorter, boat would be consistent with around 3000 watts as the calculations show. Here is a link to a post about a 33', 8000 lb catamaran that uses two of the 6kw ePropulsion motors in their outboard motor format. Same underwater, just mounted as an outboard versus a pod bolted to the hull. He reports 5.3 knots at 3200 watts. 3200 watts at 50 or so volts from the batteries is 64 amps, split between a minimum of 2 BMSs each with a capability of 200 amps, so I should be fine there as well. At max throttle in an emergency running 12,000 watts the current draw would be 240 amps, well within the capacity of the BMSs.
In terms of measuring drag, I have not done that. But I have spent many hours under the boat sanding back years of bottom paint, applying barrier coat (not strictly needed as the boat is wooden and sheathed in fiberglass and epoxy) and finishing off with Interlux VC17 which the local sailors use on their race boats. I think the bottom is as slippery as it's going to get at this point.
Thanks - Lars
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