Mach number temperature generally decreases with increasing altitude between sea level and , the speed of sound also decreases. For example, the standard atmosphere model lapses temperature to at altitude, with a corresponding speed of sound (Mach1) of , 86.7% of the sea level value. While the terms "subsonic" and "supersonic", in the purest sense, refer to speeds below and above the local speed of sound respectively, aerodynamicists often use the same terms to talk about particular ranges of Mach values. This occurs because of the presence of a "transonic regime" around M = 1 where approximations of the Navier-Stokes equations used
Mach Five kind of terrain (firm, icy, unsteady ground, and significant slopes). Control G = Homing robot (As in the original) When pressed, the Mach Five releases a remote control robot bird capable of transmitting footage back to the Mach Five from wherever it is. This function wasn't used in the film. In the 1959 movie "On the Beach" Dr Julian Osborne (played by Fred Astaire) races in a white number 5 Ferrari while wearing a white helmet and goggles—eerily similar to Speed Racer in the Mach Five. In the animated 2008 series, which takes place about 40 years after the events