On Friday, 7 June 2019 14:32:54 UTC+1, wrote:

Once again, laboring under the burden of theory rather than practice.

Wind turbines have variable vanes. They rotate at their base from very roughly 60 degrees to the wind to 0 degrees to the wind. At 0, they do not turn, and typically this state is when the wind speeds are too high (exceedingly rare), or the unit is being serviced (and the rotor is locked when under service). At 60 degrees, and with the design minimum wind velocity, it will make the design rotational speed.

Wind turbines do not pretend to use all the energy available. They use a very small fraction of it - but it is essentially "free" energy.

Peter Wieck
Melrose Park, PA

Free energy eh. No, it's expensive energy. Wind is free, but capturing it & making electricity is not by any stretch of the imagination free. I wish it were, but it isn't.


NT