Critical Mach number and slow down as it travels around the aircraft's structure. When the aircraft's airspeed reaches the critical Mach number, the speed of the airflow in some areas near the airframe reaches the speed of sound, even though the aircraft itself has an airspeed lower than Mach 1.0. This creates a weak shock wave. As the aircraft exceeds the critical Mach number, its drag coefficient increases suddenly, causing dramatically increased drag, and, in an aircraft not designed for transonic or supersonic speeds, changes to the airflow over the flight control surfaces lead to deterioration in control of the aircraft. In aircraft
Mach Five car appeared to have the same functions as the Mach Five in the original series, but the buttons Speed pressed to activate them seemed more or less random, with the same button activating different abilities (or different buttons activating the same ability) in different episodes. In 2000, a prototype Mach Five with actual cutting blades was produced as a concept car. 100 production models were planned to be made in 2002 as a street legal vehicle. Built on a 2001 Chevrolet Corvette Chassis, the body was to be extensively modified to look like the Mach Five. It was to have