center in california history was made by this aircraft, the exact one and its pilot captain, charles yeager. this airplane and this pilot are about to be the first ever to fly faster than the speed of sound in level flight. of a b-29 will take the ax at 1:00 and launch her an altitude of about 35,000 feet. the x-1 is not a military aircraft, but a flying research laboratory designed to test the effects of supersonic flight upon airplane. it is powered by four rocket engines. its weight empty is less than £5,000, but it carries £8,000 of fuel. may 29 i've done a lot of memorable things, but none of them ever before at a mission quite like this one. and no airplane ever did what the last one is about to do. breaking the sound barrier in level flight will be more a spectacular feat. it will also give the airforce valuable knowledge of the resources of new propulsion system. captain yeager gets on board the aircraft one. it can be a long flight is going to have in the little aircraft at full power. the flights can't last more than two and a half minutes but it it's going to be a fast one. ready