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was the Reynolds number, a bit of mathematical jujitsu that measured how closely the performance of a wind tunnel came to mimicking actual flight. Mastery of the Reynolds number, and using that knowledge to build wind tunnels that successfully simulated real-world conditions, was the key to the NACA’s success.
delight. But she also knew that the best thing about breaking a barrier was that it would never have to be broken again.
landing. And in 1967, Johnson and Hamer coauthored the first of a series of reports describing a method for using visible stars to navigate a course without a guidance computer and ensure the space vehicle’s safe return to Earth. This was the method that was available to the stranded astronauts aboard Apollo 13.
