Letters From Our Readers, July 12, 2021

Aerion Supersonic jet
Credit: Aerion
THE DRAG COEFFICIENT “Supersonic Saga” reports that Aerion Supersonic ceased operations (May 31-June 13, p. 18) . You might wonder why. The answer is that its AS2 aircraft was designed to fly at Mach 1.4, at which the drag coefficient is much too high for economical operation. Drag coefficient comes...

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