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If you have relative motion in the air you have a bird-mincing machine. Actually, you don't even need relative motion. Radio and TV towers, with their guy wires, are murder on birds.
Even a big,slow-moving prop will have tip speeds nearing the Mach. That's where the sound comes from.
You go resigning the wind turbune in a futile effort to save a few birds and you poison the whole idea
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam 3.08:1 gears
"Fastback" Bed Fairing
Rugged Air Dam
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