North American X-15 - David Baker

Developed in the mid-1950s by the US military and operated by NASA between 1959 and 1968, the X-15s were the first rocket-powered hypersonic research aircraft. They made 199 flights and reached speeds in excess of 4,000 mph and altitudes above 270,000 ft, considered to be beyond the atmosphere and into the vacuum of space.The book begins with a description of the X-series aircraft research programme started in the latter stages of the Second World War, successfully pushing through the sound barrier... Zobrazit více