Guinness Recognizes NASA X-43A Speed Record
It's official. Guinness World Records has recognized the world
speed record set by NASA's hypersonic X-43A aircraft earlier this
year in an experimental flight over the Pacific Ocean. Using a
scramjet engine, the unpiloted, 12 foot-long aircraft achieved Mach
6.83 -- almost seven times the speed of sound - - or nearly 5,000
mph, in a flight on March 27th.