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.
Ford Mustang Mach 1 the added handling and to deal with the prodigious torque over the stock GT. Style wise, the Mach 1 was very distinct from other Mustangs as it drew heavily from the 1970 Mach 1. In addition to the matte black spoiler and hood stripe, flat black chin spoiler, Mach 1 rocker panel stripes and Mach 1 badging on the rear, there were also faux Magnum 500 polished 17×8 alloy wheels. A retro themed interior was included with well bolstered dark grey leather seats featuring 70's style "Comfort Weave" textures, a 1970s style gauge cluster and a machined aluminium shift ball.