The ability to move the turbine blades (called feathering) to get better kinetic energy from the wind is very critical to the wind turbine performance. Typically, each blade has its own motor to be able to move and, hence, the design is more costly and complex compared to the so-called fixed-blade wind turbines.
In summary, the ability to feather the blade increases the performance of the wind turbine by capturing more kinetic energy of the blowing wind.
Hope this helps answer your question.
Professor Yehia Khalil
Yale University
USA
refer to Page no. 70 in the link. hope this may help you..
http://shodhganga.inflibnet.ac.in/bitstream/10603/30/9/chapter%204.pdf
Tnx for your great inputs... anyway, I am curious about vertical turbines, the helical Darrieus type in fact.
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