Large-span, high-efficiency wing designs have been a hallmark of Boeing’s stable since the birth of the commercial jet. Now the company plans to take this to a new level with an innovative folding wingtip designed to increase the span of its new 777X family. The airframer is preparing to test a prototype version of the deployable wingtip feature as it begins detailed design of the 777X, following completion of the firm-configuration milestone on Aug. 25. The device, which will be the ...


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