Some 30 years ago I had a Hamilton Ferris generator on my 26' sloop, It put out a lot more power over time than my outboard auxiliary. At times I would use both. I was very happy with it and kept it when I sold the boat, but eventually gave it to another sailor. They still make 'em: http://www.hamiltonferris.com/categories/Water_Power/16
Willie
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Hmmmm. That link proved my point perfectly. They stated that at 6kts, they could harvest 144Ah @ 12V in 24 hours. That's 2000Wh (allowing for charging voltage above 12V) divided by 24 hours works out to 84W of output from an "optimized" in-water towed generator. Alternatively, 350W of PV panels will generate the same amount of usable electricity in a 24 hour period, maybe more, near the equator or in the doldrums.
>
> I still have yet to see anyone back up a claim of more than 100W at 6kts, even from a $10,000+ computer-controlled, variable-pitch, transom-mounted, in-water generator.
>
> Fair winds,
> Eric
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, "Nick" <chernikit@> wrote:
> >
> > Well - I'd certainly agree if you referring to a fixed pitch propulsion propeller being used for re-gen, but there are other ways to skin this cat. Prop's and generators optimised for the purpose can do better.
> >
> >
> >
> > http://www.cruisingworld.com/gear/electronics/green-power-on-passage
> >
> >
> >
> > I've sailed on a 56' Herreshoff where we used a towed taffrail generator on a long haul to the South Pacific to good effect - had the keep the steaks frozen ;-). But in the Doldrums (ITCZ) you can sure get skunked for wind. Sitting there, 'as still as a painted ship, upon a painted ocean', we did have to run the main engine to keep up. I'm now considering a type fixed to the boat like the Duogen mentioned in the article, as I'm now in more confined waters, and that tow rope does need a degree of attention. Pricey, though.
> >
> >
> >
> > Nick
> >
> >
>
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