I agree with Steve. Trolling motors are made for, um, trolling. Even if the motors have enough power (probably not), the props aren't pitched for speed. You're probably good for 3 kts. For more, you'll need something that is more specifically designed for your purpose, like a Torqeedo or a regular ICE outboard. When you start pricing purpose built electric drives (including batteries), you'll start to appreciate how light, powerful, simple and inexpensive a gasoline outboard is.
In any case, at 2.5 tons of displacement, you should be looking at electric drive systems rated at about 2.5kW. A Torqeedo cruise 2.0, might be a little underpowered, but it should be fairly close. Beyond that, you would be looking at a Cruise 4.0 or an inboard systems, if you really want to go electric.
Fair winds,
Eric
1964 Bermuda 30 ketch, 5.5kW Propulsion Marine drive, 8kWh lithium batteries
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Steve" <sstuller@...> wrote:
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> You have two choices. Drop the hook and wait for the tide to turn or turn the boat around and you will be going forward instead of backward. I'm just teasing you. With the flat pitch props on trolling motors you would be lucky to do four knots with no tide. The thrust figures are static thrust. At four knots you would be lucky to get half of that. Thanks. Steve S.
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> --- In electricboats@yahoogroups.com, "dougmcq000" <dougmcq000@> wrote:
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> > Considering a pair of trolling motors with 164lbs total thrust - approximately 4HP. Wood sailboat is 5,000 lbs with 20' waterline. Going against a 4 knot current is this boat going to go backwards or forwards?
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> > I don't know how to figure this out but I'm sure somebody on this forum can.
> >
> > Thanks,
> > Doug
> >
>
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