Blue Edge rotor blade (Eurocopter)

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MotoH
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. . .This week Eurocopter unveiled its most recent effort to reduce helicopter noise with the radical-looking Blue Edge rotor blade. The new blade has been tested on one of the company’s EC155 helicopters and was shown to reduce noise 3 to 4 decibels, according to the company. . . .
http://www.wired.com/autopia/2010/02/eurocopter-moves-one-step-closer-to-whisper-mode/"

Video:
https://www.youtube.com/watch?v=dBS1NRsYuF8

Pretty cool.

You can't beat the sound of a Huey though!
 
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Huey's are atrocious. They fly over campus, every day - all day. Whap Whap Whap...you can hear them having blade slap from five miles out - literally. It gets old...