aircraft and rockets designed to test and evaluate new technologies and aerodynamic concepts. What’s an X-plane? These are experimental U.S. Zoom in: To build the X-66A, Boeing will convert an MD-90 into a full-scale demonstrator aircraft with extra-long, thin wings stabilized by diagonal struts.
achieve the goal of net-zero aviation greenhouse gas emissions. This is the first X-plane specifically focused on helping the U.S.
Why it matters: SFD has been designated as the X-66A, underscoring its status as a vitally important U.S. What is SFD: In January, NASA selected Boeing and its industry team to lead the development and flight testing of a full-scale Transonic Truss-Braced Wing (TTBW) demonstrator airplane as part of the SFD program. Air Force designated the Sustainable Flight Demonstrator (SFD) as the newest X-plane, joining a list of pioneering experimental aircraft that have radically shaped global aeronautics for the past 76 years.
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