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to be true, then it probably isn't.  The claims for this turbine not only violate logic, they violate the Betz limit.  Vertical axis turbines were invented in France in the 1920's ( Darrius? 1927?), and there's a simple reason why they haven't been adopted for making electricity during the ensuing 80 years of windpower.  Other configurations perform far better.

It doesn't really matter that a VAWT (Vertical Axis Wind Turbine) can work at lower wind speeds, for there's little energy to be captured there.  Besides, modern VAWTs usually need startup power to get spinning, to overcome the drag "from the other side."  A modern HAWT (horizontal axis wind turbine) can also begin spinning at around 4 meters per second, but a 2.5 MW turbine only produces around 200 kW or less. (With a proportionately larger rotor diameter, one gets more power at lower winds, but needs to cut out sooner.)  VAWTs work great when simple shaft power is needed, and they can be cheap to build when small.

If i wanted to rate my turbine power at 40/mps, i'd design something which could be dropped into hurricanes.

"Life shrinks or expands in proportion to one's courage." - Ana´s Nin

by Crazy Horse on Tue Nov 27th, 2007 at 03:08:47 PM EST

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