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The Gruman Windstream-25 is a three-bladed wind energy conversion system being tested at ERDA's Rocky Flats, Colorado…
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The Gruman Windstream-25 is a three-bladed wind energy conversion system being tested at ERDA's Rocky Flats, Colorado facility, c. 1977. Original public domain image from Flickr

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The Gruman Windstream-25 is a three-bladed wind energy conversion system being tested at ERDA's Rocky Flats, Colorado facility, c. 1977. Original public domain image from Flickr

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