The X-15 rocket plane flew at Mach 6.72 and at altitudes above 67
miles -- at the threshold of space! The men who flew this amazing
plane became the USAF's first astronauts. Powered by an XLR-99
engine capable of producing 70,000 pounds of thrust at peak
altitude, the X-15 pushed the envelope for manned aircraft past the
post office. Notably, both Apollo commander Neil Armstrong and
Space Shuttle commander Joe Engle piloted the X-15. Originally
highly restricted, the manual was recently declassified and is here
reprinted in book form. This affordable black and white facsimile
has been reformatted. Due to the historic nature of this text,
image quality can vary. Care has been taken however to preserve the
integrity of the text.
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