NASA is studying a range of configuration options for its next large-scale X-plane as it awards contracts to four companies to develop system requirements for proposed ultra-efficient subsonic transport (UEST) flight demonstrators. Funding permitting, the agency plans a series of manned X-planes to follow the X-57 Maxwell distributed electric propulsion demonstrator now under construction and the Quiet Supersonic Transport (QueSST) low-boom X-plane in preliminary design at Lockheed Martin ...

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