Mach 5 - Wikipedia. Mach 5 or variation, may refer to: Mach 5 (speed), a mach number representing the delimiting speed separating supersonic speed (below Mach 5) from hypersonic speed (above Mach 5), 5 times the speed of sound. Mach Five (Japanese: マッハ号), a racing car in the Speed Racer franchise. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.