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       #Post#: 2984--------------------------------------------------
       Effecient wind turbine design
       By: munkster Date: May 28, 2014, 3:52 pm
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       Hi, I'm a new here. I'll get straight to the point:
  HTML http://cureforglobalcrises.weebly.com/wind-lesson.html
  HTML http://cureforglobalcrises.weebly.com/wind-lesson.html
       A friend emailed me this, and I can't help think - is the guy
       who has these claims on his website, is the three winged HWAT's
       really as flawed as he claims?
       Thanks for your opinion.
       
       #Post#: 2986--------------------------------------------------
       Re: Effecient wind turbine design
       By: lynx wind Date: May 28, 2014, 4:55 pm
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       I read over the website.  The flaw with the huge three bladed
       turbine is not so much the airfoil and the efficiency of the
       design - it's the tremendous strain on the transmissions to
       convert the slow rpm (2-6) to turn the high speed alternator.
       The big mega watt turbines look slow but the blade tips are
       moving at several times true wind speed. The transmissions are
       built in shipyards and the bearings fail routinely.  Many large
       turbines are not actually making power and diesel or CG
       generators are located around the property to fill the quota.
       There is a limit to how much power can be gathered from wind.
       Its called the Betz Limit and is about 54% of the power in the
       wind for a given swept area.  To convert kinetic energy in wind
       to a rotating motion necessitates the airflow is allowed to move
       through and around.  A solid object would gather all the energy
       but wont rotate.  Adding more and more blades causes air to
       build up and slow down.  Faster air then moves around.  Good
       design requires careful compromise.  I have had the best results
       with three bladed design (close to 50% of the power in the wind)
       It's possible the author of the website made simple observations
       and assumptions without actual experience.
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