The X-15 program ran from 1959 to 1968, with three aircraft exploring high altitude and high-speed flight. The research program contributed a wide range of scientific advances that were instrumental in the development of the Space Shuttle and fly by wire control technology, among other things. The work of flying the X-15 was dangerous and exacting, leading to the death of one pilot and involving numerous emergencies. It remains to this date by far the fastest and highest-flying winged aircraft in history.
Mr. Thompson’s account is matter-of-fact, with few embellishments. (The author does note that he is not a writer.) While it retains a certain flatness of style throughout, the book is nonetheless fascinating for the aviation buff. These men, including a young Neil Armstrong, were exploring the unknown fringes of the flight envelope in an unforgiving aircraft, frequently referred to in the book as “The Bull”. While sometimes the text veers into catalogues of flights with their respective purposes, it is peppered with interesting and funny anecdotes, as well as edge-of-your-seat accounts of in-flight emergencies.