Mach number a small area around the object's leading edge. (Fig.1b) Fig. 1. "Mach number in transonic airflow around an airfoil; M < 1 (a) and M > 1 (b)." When an aircraft exceeds Mach 1 (i.e. the sound barrier), a large pressure difference is created just in front of the aircraft. This abrupt pressure difference, called a shock wave, spreads backward and outward from the aircraft in a cone shape (a so-called Mach cone). It is this shock wave that causes the sonic boom heard as a fast moving aircraft travels overhead. A person inside the aircraft will not hear this.
Mach 1 Racing the 1990 Daytona 500. Mach 1 Racing Mach 1 Racing was a NASCAR Winston Cup Series team. It was owned by Hollywood stuntman Hal Needham and actor Burt Reynolds. The team made its debut in 1981, fielding the No. 22 Skoal Pontiac driven by Stan Barrett. Barrett ran ten races for the team that season, his best finish coming at Talladega Superspeedway, where he finished 9th. Midseason, Mach 1 created a second car, the No. 33, driven by Harry Gant. Gant did not win that season, but he won three poles and had thirteen top-tens, finishing third in points. In