Questions tagged [mach-number]

Use for the various Mach numbers, e.g. critical, cruise, etc., and the related instruments and sensors

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What's the relationship between mach number and drag force on an airplane?

From what i've read drag coefficient at mach 1 is several times (up to 10x) the drag coefficient below drag divergence mach number. It drops as the mach number increases. It's easy to find plots ...
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Who was the first person to break the sound barrier?

While watching this video on Wikipedia of Chuck Yeager breaking the sound barrier in the Bell X-1 in level flight, I noticed the narrator say: "For the first time, except in dive, a man has flown ...
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Cruise Mach Number less or more than Critical Mach Number

Do commercial airplanes cruise at Mach number higher than the critical Mach number? And what is the critical Mach number of airplanes like B777 or A330?
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What prevents a Machmeter from being the standard airspeed indicator?

Airspeed is more accurate when displayed by a Machmeter than when displayed by an airspeed indicator. It isn't affected by ambient temperature / density changes. It is still affected by position error,...
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Is the Mach number shown by an Air Data Computer considered a "true" Mach number?

I am trying to find more information on "true" vs. "indicated" Mach number (not airspeed). I've found older fighter aircraft manuals online that have a conversion chart from one to the other, but the ...
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