They were the pioneers who trod the territory beyond the sound barrier… a place no man had ever been before and which had killed many who attempted the journey. The rocket powered, winged bullet first flew only 42 years after man’s first powered flight, an achievement that still astounds me. To think that a toddler around at Kitty Hawk who saw one of the Wright Brothers first flights, could have heard the world’s first man made sonic boom before they reached the ripe old age of 50 is a true testament to the ability of America’s finest minds and the bravery of their greatest pilots.   The Bell X1 in flight   The Miles M52   The X Planes   US Military astronaut wings   The X2 drop   The X2 crash   The X15   An X15 launch   Armstrong with the X15   Images under Creative Commons licence with thanks to NASA, the RAF, the USAF, NPRC,