Some wind generators can also be configured as a water generator, and back again, you get the best of both worlds. Sailing upwind, the wind mode works best; downwind, probably the water mode. NO wind, you'll need another system such as solar.
Willie
--- In electricboats@yahoogroups.com, "Nick" <chernikit@...> wrote:
>
> Sure - a wind generator makes great sense at anchor, but underway in a good breeze it doesn't compare to the overall power from a sail, and you can size the water generation device to outpower any wind generator you cd carry, and a wind generator sailing downwind is useless and, as you imply, probably dangerous for small boats underway.
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> Nick
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> From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of oak
> Sent: Thursday, August 01, 2013 1:07 PM
> To: electricboats@yahoogroups.com
> Subject: Re: [Electric Boats] Re: wave powered
>
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> Wouldn't it make a lot more sense to get a wind turbine and be done with it? (just remember to duck!)
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> _____
>
> From: Nick <chernikit@...>
> To: electricboats@yahoogroups.com
> Sent: Thursday, August 1, 2013 2:10 PM
> Subject: RE: [Electric Boats] Re: wave powered
>
>
>
>
>
> 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.
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> http://www.cruisingworld.com/gear/electronics/green-power-on-passage
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> 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.
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> Nick
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> From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of cnc sales (hanermo)
> Sent: Thursday, August 01, 2013 11:47 AM
> To: electricboats@yahoogroups.com
> Subject: Re: [Electric Boats] Re: wave powered
>
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>
> Yes .. and no.
> It works, but very poorly, and generates very little power and has alot of drag.
>
> 2 large modern PV panels at 250-300W each will develop about 4-6 times the power, for very little cost.
> Today, PV panels cost under 1$/watt.
> Buying large is *very much* better than using smaller ones.
>
> There is a speed cubed or squared relationship in water.
>
> Thus fixed large surface area generators for narrow-speed-band high speed use work quite well, in water.
> Thats why steam turbines for example work quite well, reliably and efficiently (although I believe steam is more of a gas, but..).
> Its quite impractical to put one in a sailboat.
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> On a sailboat, the sail is one big wind generator, and so underway it's quite simple to power an in-water generator towed or directly attached to the boat for house battery charging.
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> Nick
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> --
> -hanermo
>
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