Another "Pie-In-The-Sky" wind turbine? [RE-wrenches]

[Dan Fink]

Yes Matt -- you bring up a couple of other things I should have
mentioned. A cP of 0.35 would be absolutely excellent for a small wind
turbine, and  that would mean 0.5 * 1.23 * 5.89 * 7.15^3 * 0.35 = 463
watts at 16 mph with a 9 ft diameter rotor. I also have a feeling that
this manufacturer may not know much about wind power, and that any fraud
may be unintentional. But advertising a cP > Betz is absurd, and once
the money is paid the customer will be be very disappointed if the
installer connects a kwh meter. 

The sad part of the whole deal comes from what Larry said
originally--the customer asked him (I paraphrase) 'why are you you
trying to sell me a Bergey / Skystream / Proven / ARE / Kestrel / when I
can get this MUCH better wind turbine instead, for less money?'

Ouch. That darned near takes an entire BOOK to answer! I recommend Paul
Gipe's book to the customer. And I recommend that Larry....punt. I won't
even mention the tower issues at 20 ft AGL......

DAN






On Thu, 2008-01-24 at 20:36 -0800, Matt Tritt wrote:
> 
> Dan,
> 
> All Betz are off! ;-)
> 
> In comparison, if I use the output from the Kestrel e300i, which is 300 
> cm in diameter (approx 10'), and is one of the most efficient small 
> turbines I know of, the output at 16 MPH is about 500 Watts @ 48 volts 
> nominal, slightly higher in high voltage format. This is an averaged 
> output using a Weibul distribution, by the way. I think that's pretty good.
> 
> The guy who makes these sounds to be in at least his 70's, maybe even 
> 80's. I doubt that he is an actual intentional fraud, just someone who 
> doesn't have a clue.
> 
> Matt
> 
> Dan Fink wrote:
> 
> >Larry -- You could tell your customer that the company claims that the
> >turbine defies the laws of Physics at its rated output--they claim it
> >beats Betz, 59.26% energy extraction. In a 16 mph wind with a 9 foot
> >diameter rotor (their 'rated output' on the website), 1324 watts are
> >available. A 'perfect' turbine running right at the Betz limit could do
> >at most 784 watts. They claim 1000. 
> >Claims of beating Betz put the turbine right in the 'fraud' category. It
> >just doesn't happen, not even with utility-scale turbines.
> >DAN FINK
> >Technical Director
> >http://www.otherpower.com/
> >
> >
> >On Thu, 2008-01-24 at 17:25 +0000, Larry Crutcher, Starlight Solar
> >wrote:
> >  
> >
> >>Wrenches,
> >>
> >>Does anyone have information or experience with the Wind Electric 
> >>Company in Oceanside, CA? http://www.windelectriccompany.com/index.html
> >>
> >>I had quoted a Skystream system to a customer. They contacted me 
> >>yesterday and said they went to see this turbine that claims to start at 
> >>1.3MPH and produce energy at 3MPH. Oh yeah, they can do all this at  
> >>only 20 feet AGL! 
> >>
> >>Like so many other makers off magic energy machines, there is very 
> >>little information. I am always a skeptic of outrageous claims and have 
> >>expressed my standard warning to my customer, "buyer beware". 
> >>
> >>If you have any info about this that might save my customer from from a 
> >>major burn, please contact me. 
> >>
> >>Sincere thanks,
> >>
> >>Larry Crutcher
> >>Starlight Solar
> >>Yuma, AZ
> >>Renewable Energy Products
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> >>
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