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post #77 of Old 10-18-2012
Stumble
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Re: Optimal propulsion system

The problem with towed and shaft generators is they require a boat that can maintain high average speeds thru the water over long periods of time. Most of these generators require a boat speed of 5kn to start working and only become really powerful past 6. That doesn't sound that bad, but they will also cost you roughly 1/2 a kn of speed while operating.

So unless you are consistently cranking out 130+ days you just aren't going fast enough to use them. And while I know many cruisers have hit that mark once or twice, not many can do it day after day reliably enough to count on them for power generation.

Greg Rubin
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