http://www.youtube.com/watch?v=dBS1NRsYuF8endofvid
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Eurocopter Blue Edge Rotor Blade Noise Reduction
Eurocopter video showing the reduction in rotor noise acheived in flight tests of its Blue Edge blade on an EC155 helicopter. Compared with a conventional blade, the Blue Edge has a tip with both forward and rearward sweep. Eurocopter says this gives the blade more time to interact with the vortex shed by the rotor, reducing the characteristic impulsive (slap-slap) blade-vortex interaction noise generated by a helicopter.
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27 February 2010
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