Eurocopter Introduces New, Quieter Blade Technologies. The Wired (2/25, Paur) "Autopia" blog reported Eurocopter "unveiled its most recent effort to reduce helicopter noise with the radical-looking Blue Edge rotor blade." The new blade, which was tested on EC155 helicopters, "was shown to reduce noise 3 to 4 decibels." Additionally the company introduced a new technology called Blue Pulse which..