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Non-Tech : Alternative energy -- Ignore unavailable to you. Want to Upgrade?

To: Ira Player who wrote (5546)	11/14/2008 2:36:30 PM
From: No Mo Mo	Read Replies (1) \| Respond to of 16955

Correct. The tips move at a high rate but blades are large enough that one (a bird or otherwise) can see 'em coming from a ways away. Imagine seeing a 747 swoop into town for a landing. The almost look like they are defying gravity. The friend I referenced said the blade tips, in a strong wind, actually approach the speed of sound. Turbulence at the tip is supposed to be a problem with performance. That's around 60 RPM's based on your math. Hard to believe a blade that large could spin that fast.