Stan Barrett breaks the sound barrier, being the first to do so on land

On the 17th December 1979, Stan Barrett attempted to break the Land Speed Record, and the sound barrier in the Budweiser Rocket rocket powered three-wheel vehicle.

His calculated speed was 739.666 miles per hour, (Mach 1.01), which would have made Barrett the first man to break the sound barrier in a land vehicle. The attempt was surrounded by controversy and the speed was never officially recorded.