LYON, France—Airbus has completed the second of three flight-test campaigns in the Blade demonstration program, aimed at evaluating the feasibility of natural laminar flow on a commercial aircraft. A “super smooth” laminar air flow, as opposed to a turbulent air flow, creates less skin-friction drag and is therefore more fuel efficient. From April to September, Airbus used a modified A340 to gather data on the heart of the problem—how tolerant is a laminar air flow ...

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