https://www.boeing.com/features/2019...ngs-01-19.page
Boeing revealed the newest Transonic Truss-Braced Wing (TTBW), which researchers
say will fly higher and faster than the previous TTBW concepts. The new
configuration is designed to offer unprecedented aerodynamic efficiency while
flying at Mach 0.80.
From end-to-end, the folding wings measure 170 feet. The high wingspan is made
possible by the presence of a truss, which supports the extended length of the
ultra-thin wing.
Originally, the TTBW was designed to fly at speeds of Mach 0.70 – 0.75. To
increase the aircraft’s cruise speed, the new concept now has an optimized truss
and a modified wing sweep. By adjusting the wing sweep angle, the truss can
carry lift more efficiently. The end result was a more integrated design that
significantly improved vehicle performance.
The new changes follow extensive wind tunnel testing at NASA Ames Research
Center. For nearly a decade, Boeing and NASA have been studying the concept as
part of the Subsonic Ultra Green Aircraft Research (SUGAR) program. The research
focuses on innovative concepts that reduce noise and emissions while enhancing
performance.
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