Video Daily: New Helicopter blade reduces noise to almost silence
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 on a helicopter. Blade-vortex interaction is the source of the pulsating sound most of us are familiar with when helicopters fly overhead. The noise is created when a rotor blade hits the wake vortex left behind from the blade in front of it."

Current Hulu investor Providence Equity Partners has invested $50 million into the new Qiyi online video service started by search giant Baidu.
The business rating and review site Yelp has been sued this week by two law firms, which are alleging unfair business practices and extortion.






