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A model of the Transonic Truss-Braced Wing aircraft in a wind tunnel at NASA's Ames Research Center. By early 2019, following extensive wind tunnel testing at NASA Ames Research Center, an optimized truss and more sweep for the 170 ft (52 m) span wing allowed flying higher and faster, up from Mach 0.70–0.75 to Mach 0.80 like current jetliners. [3]
Illustration of the Boeing SUGAR Volt concept aircraft. SUGAR Volt is the hybrid aircraft concept proposed by a team led by Boeing's Research & Technology division. It is one of a series of concepts put forward in response to a request for proposals for future aircraft issued by NASA.
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A different area rule, known as the supersonic area rule, developed by NACA aerodynamicist Robert Jones in "Theory of wing-body drag at supersonic speeds", [2] is applicable at speeds beyond transonic, and in this case, the cross-sectional area requirement is established with relation to the angle of the Mach cone for the design speed.
The ecoDemonstrator Program is a Boeing flight test research program, which has used a series of specially modified aircraft to develop and test aviation technologies designed to improve fuel economy and reduce the noise and ecological footprint of airliners.
With Smith, R., and Summers, J., Transonic Wind Tunnel Tests of an F-8 Airplane Model Equipped with 12 and 14-percent Thick Oblique Wings, NASA TM X-62478, Oct. 1975 With Smith, R., and Summers, J., Transonic Longitudinal and Lateral Control Characteristics of an F-8 Airplane Model Equipped with an Oblique Wing, NASA TM X-73103, March 1976
The Greased Lightning was followed by the Langley Aerodrome No. 8 (LA-8), a tandem-wing, deflected-slipstream (demonstrated in the late 1950s by the Ryan VZ-3 Vertiplane) design with four propellers on each wing for urban air mobility, tested in a Low-Speed Wind Tunnel before flight tests in late August 2019.