A copy of the NA 55-221 Design Summary for North American X-15 aircraft, dated 27 November 1959. This is the written proposal for the X-15 Advanced Research Airplane submitted by North American Aviation May 9, 1955. Credit: NASA Technical Reports
A copy of the NA 55-221 Design Summary for North American X-15 aircraft, dated 27 November 1959. This is the written proposal for the X-15 Advanced Research Airplane submitted by North American Aviation May 9, 1955. Credit: NASA Technical Reports
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