Blue Edge rotor blade (Eurocopter)

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Eurocopter has introduced the Blue Edge rotor blade, designed to significantly reduce helicopter noise. Testing on the EC155 helicopter demonstrated a noise reduction of 3 to 4 decibels. The innovative design aims to address concerns about noise pollution from helicopters, particularly in urban areas. Despite advancements in noise reduction technology, some users still express a preference for the sound of traditional helicopters like the Huey. The discussion highlights ongoing efforts to improve helicopter acoustics while acknowledging the challenges of existing noise issues.
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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...
 

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