A version of this article appears in the July 28 edition of Aviation Week & Space Technology. It was hailed as a game-changing development in rotary-wing aviation in 2011, offering a “different philosophy” in flying a helicopter, according to then-CEO Lutz Bertling. But it is becoming increasingly clear that the new twin-engine medium-size X4 from Airbus Helicopters (formerly Eurocopter) will not embrace all the technologies that might have been intended for it. Three years ...


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