NASA has selected Boeing and its industry team to lead the development and flight testing of a full-scale Transonic Truss-Braced Wing (TTBW) demonstrator aircraft.

The technologies demonstrated and tested as part of the Sustainable Flight Demonstrator (SFD) programme will inform future designs and could lead to breakthrough aerodynamics and fuel efficiency gains.

When combined with expected advancements in propulsion systems, materials and systems architecture, a single-aisle airplane with a TTBW configuration could reduce fuel consumption and emissions up to 30% relative to today's most efficient single-aisle airplanes, depending on the mission.

The SFD programme aims to advance the civil aviation industry's commitment to reaching net zero carbon emissions by 2050, as well as the goals set forth in the White House's US Aviation Climate Action Plan.

"The SFD programme has the potential to make a major contribution toward a sustainable future," said Greg Hyslop, Boeing chief engineer and executive vice president of engineering, test and technology. "It represents an opportunity to design, build and fly a full-scale experimental plane, while solving novel technical problems."

Ultrathin wings braced by struts with larger spans and higher-aspect ratios could eventually accommodate advanced propulsion systems that are limited by a lack of underwing space in today's low-wing airplane configurations. For the demonstrator vehicle, Boeing will use elements from existing vehicles and integrate them with all-new components.

NASA's funding through the SFD Space Act Agreement totals $425m. The SFD programme will also leverage up to $725m in funding by Boeing and its industry partners to shape the demonstrator programme and meet the resource needs required. Separately, Boeing's previous internal investments for recent phases of sustainable aviation research total $110m.

The TTBW airframe concept is the result of more than a decade of development supported by NASA, Boeing and industry investments. Under previous NASA programmes including the agency's Subsonic Ultra Green Aircraft Research program, Boeing conducted extensive wind tunnel testing and digital modeling to advance the design of the TTBW. Early conceptual studies started under NASA's Environmentally Responsible Aviation programme.

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