Boeing X-66
Experimental aircraft
Boeing X-66
The Boeing X-66 was an experimental airliner that was under development by Boeing. It was part of the X-plane series created in collaboration with NASA and the Sustainable Flight Demonstrator program. It used an extra-long and thin wing design stabilized by diagonal bracing struts, which is known as a Transonic Truss-Braced Wing. The aircraft configuration was based on research studies referred to as "Subsonic Ultra-Green Aircraft Reach (SUGAR)" which extensively studied truss-bracing and hybrid electric technologies.
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