One of the mysteries of the English language finally explained.
An instrument in an aircraft indicating airspeed as a Mach number.
- ‘Alternatively, the machmeter may be combined with the Air Speed Indicator (ASI), in which case it is often referred to as a Combined Speed Indicator (CSI).’
- ‘No increase in speed was observed but he sensed that the drag level had increased, so he steepened the angle of dive until 0.96 appeared on the Machmeter.’
- ‘On most aircraft you use your CAS to determine TAS up to a certain altitude, then use the Machmeter beyond that altitude.’
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