Blades as fast as a guillotine
The killer of eagles and all birds at wind farms is blade tip speed. ...What is hard to comprehend is that at 20 rotations per minute, the tip speed of the blades for the three turbines works out to 180 mph, 215 mph and 222 miles per hour. The speed and power of these blades is what amputates the wings and heads off flying eagles. From miles away the blades look rather slow, but up close these huge blades move faster than a guillotine.
March 5, 2009
by Jim Wiegand
in Redding Searchlight
The killer of eagles and all birds at wind farms is blade tip speed. This is what kills and this is what the wind industry does not publicize or put in the environmental documents.
The Hatchet Ridge Wind Farm, which was recently approved, is going to construct three different size wind turbines. According to the specifications given, the blades on the proposed turbine towers will be 126 feet, 151 feet and 156 feet long. They will rotate at approximately 20 rotations per minute. The diameter of each rotation is 252 feet, 302 feet and 312 feet.
What is hard to... [continue via Web link]