Hi David and All, I prefer downwind rotors with rotatable tower foils , I had been building them for 5 years 15 years ago. Your right, most noise comes from the interaction of the blades and the tower. Another source is the blade tips. I solved that by using single thickness blades , ie curved sheets of fiberglass. They are lighter and produce more power becaues of lower blade drag. The good thing about this was by shaping it right the wind pressure caused the blade to feather by bending in higher winds allowing it to genorate power in higher winds without overloading. Too bad the drawings won't come up for me, I'd like to see it. Do you build windgens? If so I have some ideas I'll never use. I'll give you for free offline as I want more windgens out there too. jerry dycus --- David Teal <[EMAIL PROTECTED]> wrote: > Here is my patent spec. for noise reduction of wind > turbines. I hope this > will allow more of them to be used, as it mitigates > one of their public > acceptability problems. > http://l2.espacenet.com/dips/viewer?PN=GB2353825&CY=gb&LG=en&DB=EPD > > David Teal > >
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