Mach Bragging Rights

“Hyper Drive” (AW&ST May 20, p. 24) states that: “In the 6 min. it took the diminutive vehicle to travel at up to Mach 5.1 over 230 nm to its watery grave, the X-51A program smashed every time-and-distance record for sustained, air-breathing hypersonic flight.” Although the previous sentence is...

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