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 standings, he left the team for Jackson Bros. Motorsports, taking Skoal and No. 33 with him. In 1989, Mach 1 switched to the No. 66 and signed rookie driver Rick Mast. In their first race together, the Daytona 500, Mast drove the unsponsored car to a sixth-place finish, an accomplishment he later said was the one he was the most proud of. Mast and Mach 1 ran twelve more races together that season, they were unable to duplicate that effort. Needham closed the team and sold it to their crew chief, Travis Carter. Travis Carter Motorsports entered NASCAR competition in