Rolls-Royce expressed confidence this week that the open rotor concept can be viable, asserting that it will "comfortably meet Stage 4 noise requirements." Speaking in Washington at the Eco-Aviation conference presented by ATW and Leeham Co., Strategic Marketing Manager-Future Programs Paul Randall said the open rotor is "the true game-changer" and could provide a 25%-30% fuel efficiency gain over turbofans powering narrowbodies today and be 10%-15% more fuel efficient than advanced ...

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