@ron_eisele X-15 on the lakebed runway @EdwardsAFB with a B-52 mothership flyby - September 1961. @NASAArmstrongpic.twitter.com/GCqNI8o1g8
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2) Scott Crossfiels was the "Chief" engineering" for North American...So, we can trust him when he was speaking bout the X-15 development...
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1)....Necessary but not suffisant...! But he had the merit to write about the X-15 development in his biography
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2) Anyway, everybody interested by X-15 story can find a lot of or all informations about its development here : https://www.nasa.gov/pdf/470842main_X_15_Frontier_of_Flight.pdf …
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