We are accustomed to seeing airliner wings change shape on approach, deploying flaps and opening slots to increase lift and reduce landing speed. But for most of the flight, changes are restricted to small movements of individual surfaces as the aircraft maneuvers or reacts to turbulence. Now, in pursuit of higher fuel efficiency, NASA and Boeing are developing technology to smoothly change the wing's shape continuously throughout the flight—even characteristics such as twist that are ...

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