Boeing has unveiled a refined design for its Transonic Truss-Braced Wing (TTBW) ultra-efficient airliner concept. The 737-class aircraft, with a 170-ft.-span low-drag wing, is designed to fly at Mach 0.8, a typical airliner cruise speed and faster than previous versions of the design. The TTBW concept was originally developed in 2010 under the Boeing and NASA Subsonic Ultra Green Aircraft Research (SUGAR) program to study new configurations for ultra-efficient airliners that ...

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