This is the SCAT-15F: The ultimate SST, and best looking, IMO.
"…In 1964, advances in the sophistication of aerodynamic theory and computer codes at Langley allowed a team of Harry Carlson, Ed McLean, Warner Robins, Roy Harris, and Wilbur Middleton to design an improved SCAT configuration, called the SCAT-15F. This fixed-wing version of the earlier variable-sweep SCAT-15 configuration was designed using the latest, computer-based supersonic design methodology that Langley had developed, resulting in a L/D ratio of 9.3 at Mach 2.6, an amazing 25 to 30 percent better than the previous state of the art at that time. The new Langley theories permitted the researchers to shape the wing with reflex, twist, camber, and other parameters that nearly optimized its supersonic capability. When informed by the design team of the SCAT-15F’s projected performance, Larry Loftin (Langley’s top manager for aeronautics) did not believe the prediction. Subsequent wind tunnel results, however, proved the estimates accurate and the SCAT-15F remains to this day one of the most aerodynamically efficient SST designs ever conceived. Carlson, McLean, Robins, Harris, and Middleton were awarded a patent for the SCAT-15F design in 1967." -NASA archives
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