Letters From Our Readers (March 6, 2017)

Credit: Falightradar24
More to the Hypersonics Story The relatively thorough article “Hyper Threat” (Feb. 20-Mar. 5, p. 20) did not cover hypersonics conducted by then-Air Force Flight Dynamics Laboratory (AFFDL) on the high L/D configurations called the FDL-5 and FDL-8 in the 1950s, ’60s and ’70s. NASA was working on the...

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