Unconventional configurations will almost certainly be needed to meet the “Earth friendly” emissions standards required to support sustainable growth in commercial aviation beyond the 2030s, but there is less certainty as to what shapes those unusual future airliners will take. One potential design that recently successfully traversed another round of wind-tunnel tests is the transonic truss-braced wing (TTBW) concept under study by Boeing and NASA. Although in some respects it ...

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