What is Critical Mach Number?

Also known as Mcrit, local airflow around some parts of the airframe reaches the speed of sound. Find out how it works in this simple explainer.
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[@ibsn87]

when you study this stuff and "Get it" and then you come across these fantastic videos and really Get it.... Whoever is making these great tid bit videos is a legend. You are helping us all be better pilots!

[@flightclubonline]

Wow, thanks!

[@freshyip]

Couldn't have said it better bro

[@TCPUDPATM]

I love that the words are carefully chosen in all your videos. Thank you! The Aussie accent is a pure bonus.

[@flightclubonline]

Wow, thank you!

[@mantombimushwana5802]

You are a life savior, No one can beat you in this game really, no1 has ever explained it better than this ❤🎉

[@mateigabrielzaharia4842]

This was easier than I imagined. Maybe you made it so easy to understand.

[@aykutdulkadiroglu5620]

loved the video and the speaker's voice

[@cesarachurra2321]

This is the best explanation ever loved it

[@omaraboud1306]

Great explanations. Doing my ATPL right now and this helps a lot! Thanks!

[@flightclubonline]

Thank you and all the best of luck.

[@thomasbell8352]

Never heard MACH pronounced Mack always heard Mock. Must be a British thing. Good explanation.... USAF veteran.

[@KLee-yj7vs]

Thanks for another clear explanation! :D

[@flightclubonline]

My pleasure!

[@faisalaserii616]

you are legends guysssssssss

[@sheikhzeeshan8658]

beautifully explained

[@flightclubonline]

Thank you! 🙂

[@techin7205]

You are very great thx

[@flightclubonline]

Thank you too

[@adriangm5590]

Love you

[@tonyr.2321]

You are the best, Ozi Ozi Ozieeee

[@7591warthog]

Sorry to disagree, but anyone can get me wrong. Mcrit is the airplane MACH number at which the 1st dot of a sonic flow appears on the upper wing surface. At this MACH number, there is not any shock wave yet on this portion of the wing. The onset of the 1st shock wave occurs at a MACH number called Mlim or the limit MACH number.

[@andrianarfinda8784]

What is panasonic?

[@maheralazzawi7814]

very good

[@flightclubonline]

Thanks

[@jcc801]

Does the airflow reach the speed of sound because the air particles are attached to the wing?

[@chard6649]

Hi there, what is critical mach number useful for, under which circumstance do we need it for?

[@DiamondAviation727]

Critical Mach Number or for short Mcrit, is important because when you reach this point or surpass, the aircraft becomes unstable, especially if the shockwave is over control surfaces like ailerons, or elevators. The shockwave also sharply decreases lift and increases drag over the surface it is on.

[@goodgameproductions3039]

What is transsonic?

[@ErimTuna172]

When some surfaces has speed of Mach 1.0 is transsonic. When you actually fly an airliner, you are transsonic. At the speed of mach 0.85 as you watched on the video, speed over the wing upper surface is Mach 1.05. That's transsonic. Not the whole plane is over Mach 1.0 but some parts. Supersonic also means Mach 1.0 but in supersonic, airflow on every part of aircraft such as fuselage, wings, other parts, is equal or more than Mach 1.0. Whole aircraft is over Mach 1.0

[@ErimTuna172]

Two methods to increase the critical Mach number are: thin aerofoils and sweepback of the wing.