The quirky blade on this Eurocopter EC155 isn't a visual fluke with the jpeg I used - it's a double-swept rotor design that the worldwide helicopter marketshare leader is developing to make its machines quieter.
At this year's Heli-Expo exposition in Houston, Eurocopter opened the usually closed door on several of its research projects, including Blue Blade. The passive noise reduction technique could very well show up on future models or upgrades, two of which the company promised to reveal later this year.
The video below, provided by Eurocopter, demonstrates the effect of the new blade design.
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