These wind turbines are so awesome. Watch their graceful motion and listen for the "whoosh" as those massive (100+ foot) blades sweep across the sky.
Cool.
Peace,
John
PS - geek moment. I got to wondering about the whoosh and did a little math. If I'm right, the blade tips are moving at over 100 MPH! That will certainly generate enough turbulence to be audible.
PPS - super geek moment - With 100' blades the tips scribe a circle with a circumference of 628 feet (2pi x radius) we timed 4 revolutions in 15 seconds making it 16 rpm.
16 revs x 628' = 10048 fpm
10048'/5280 = 1.9 miles per min x 60 = 114 MPH
If the blades are 134 feet (as I read somewhere) the tip speed is 153 MPH.
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