Mach number

Mach Number
Mach number is the speed of an object moving through the air divided by the speed of sound in those current conditions. The speed of sound is directly related to temperature and density so it is constantly varying.

The Mach number depends on the speed of sound in the gas and the speed of sound depends on the type of gas and the temperature of the gas. The speed of sound varies from planet to planet.

Critical Mach number
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Mach number. The ratio of the true airspeed of the aircraft to the speed of sound in the same atmospheric conditions, named in honor of Ernst Mach, late 19th century physicist.

Mach number - ratio of true airspeed to the speed of sound. Mach 1 is the speed of sound at sea level, ISA, approximately 1,100 feet per second or 760 mph.

Mach Number
The aircraft speed divided by the speed of sound.
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Mach number.
Ratio of airspeed to the local speed of sound (Mach 1 is the speed of sound under current atmospheric conditions); Symbols: M; ...

Mach Number - The ratio of true airspeed to the speed of sound
Marker Beacon - Electronic navigation facility transmitting a 75 MHz vertical fan shaped radiated pattern
Mayday - International radiotelephony distress signal ...

MACH NUMBER - Named after the Austrian physicist Ernst Mach, a means of recording the speed of a body as a ratio of the speed of sound in the same ambient conditions.

Wing Sweep and Mach Number Effects
Both wing sweep (Λ¼) and Mach number (M) affect the lift curve slope. A useful expression for its derivation (ref Howe) in this instance is given below: ...

Mach number - The ratio of true airspeed in relation to the speed of sound, e.g. Mach 0.8 = 80% the speed of sound, or 530 knots at sea level, and 465 knots at 36,000 feet
Medevac - MEDical EVACuation, as in "medevac helos" ...

This was done primarily to properly position the center of lift relative to the centre of mass and not for the aerodynamic benefit of increasing the critical Mach number of the wing.

Cruising speeds are at a constant mach number, about 82 percent of the speed of sound. This translates to a groundspeed of about 550 miles per hour, although that too can vary considerably with headwinds, tailwinds and other factors.

The same applies at very large Reynolds numbers, which are practically associated with Mach numbers larger than .

A navigation sensor based on atmospheric data sensors; usually measures static pressure, dynamic pressure, and outside air temperature; sometimes computes other atmospheric data, such as indicated airspeed, Mach number, calibrated airspeed, ...

See also: Mach, Speed, Aircraft, Navigation, Flight