出典:Wiktionary
Machmeter (複数形 Machmeters)
出典:Wikipedia
出典:『Wikipedia』 (2011/02/16 19:22 UTC 版)
A Machmeter is an aircraft pitot-static system flight instrument that shows the ratio of the true airspeed to the speed of sound, a dimensionless quantity called Mach number. This is shown on a Machmeter as a decimal fraction. An aircraft flying at the speed of sound is flying at a Mach number of one, expressed as Mach 1.