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 X15 Extending the Frontiers of Flight Book Cover The X15 was the ultimate "X" vehicle Built in the 1950s, she became the fastest and highestflying winged aircraft of its time During 199 flights from 1959 through 1968, she collected data about hypersonic flight that was invaluable to aeronautics and to developers of the space shuttle a response, "The main reason for the switch from H1 to X15 TN was edge retention True, H1 is a bit more corrosion resistant than X15 but according to tests done by CATRA in England X15 has nearly twice the edge retention of H1 (For reference, X15 has about 2/3 the edge retention of our 440C) Response from users showed us that theThe X15 was an experimental rocket plane, built by North American Aviation, that set aircraft speed and altitude records, some of which still stand todayFirst flown on , the it was used to provide data on thermal heating, control, and stability at extremely high speeds, and on atmospheric reentry Homework Chapter 16...