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Video Daily: New Helicopter blade reduces noise to almost silence
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The following comments relate to this news article:
article published on 26 February, 2010
Although not in our normal niche, this article was too interesting to pass up.
Eurocopter has created a new helicopter blade, dubbed Blue Edge, that significantly reduces noise from the rotor blades. Testing on an EC155 helicopter has seen noise reduced by 4 decibels.
Says Wired: "The technologies are able to reduce noise by minimizing the blade-vortex interaction of the main rotor ... [ read the full article ]
Please read the original article before posting your comments.
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KSib
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26. February 2010 @ 22:24 |
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A helicopter could stalk you and you'd never know :)
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B33rdrnkr
Newbie
2 product reviews
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26. February 2010 @ 23:01 |
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with night vision/infrared and cameras that can see a crack in your fingernails from 15,000 feet they prolly already do now and you don't know it....
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ddp
Moderator
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26. February 2010 @ 23:12 |
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see blue thunder the movie with roy schieder. the helicopter was silent in that movie tho not in reality.
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llongtheD
Suspended due to non-functional email address
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26. February 2010 @ 23:19 |
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Reducing the blade noise by a mere 4 decibels, is hardly going to make the helicopter silent.
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Senior Member
2 product reviews
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26. February 2010 @ 23:20 |
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That's pretty cool, I know sound intensity doubles every 10 decibels but I'm surprised that it's only a four-decibel reduction. This sounds much closer to a 10 decibel reduction to my ears.
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jony218
Suspended due to non-functional email address
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27. February 2010 @ 01:30 |
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That is great now if they can put a muffler on the jet engine that powers the rotors it might actually prove useful.
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Senior Member
4 product reviews
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27. February 2010 @ 18:06 |
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they did this a long time ago on many Military stealth based choppers, it had a major draw backhowever, it made them to stall prone.
it was used on Comanche stealth choppers(RAH-66)in conjunction with a Fenestron tail. Fenestron was also designed by Eurocopter to be quieter.
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SoulGLOW
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27. February 2010 @ 20:43 |
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all you need for stealth tech is a few mics and some software to then create an inverse wave form to the one the mics pick up and then pump out that sound through speakers nearby. there in both wave forms will cancel each other out.
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djgizmo
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27. February 2010 @ 23:13 |
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SoulGLOW, that would normally be true... however, remember the sounds waves need to arrive at the listener / patron at the same time for it to work. If either wave arrives 1ms late, the sound is no longer canceled.
I think they do this to some extent on some of the current generation stealth choppers, however rumor has it they are being phased out from a new magnetic technology from darpa.
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