Airfoils, Stalls and Critical Angle of Attack - AeroGuard Flight Training

An introduction to airfoils and how wings create lift through the Venturi effect, as well as the key items of the chord line, relative wind and the angle of attack. As the angle of attack is increased, air around the airfoil changes its reaction based on the boundary layer, until the wing reaches a critical angle of attack where the plane then stalls, and produces significantly less lift. This will then cause an audible alert in the cockpit, alerting the pilot to reduce this angle to enable continued safe flight.

[Leqendjusten]

Best stall explanation ever that I have heard of it so far, splendiferous!

[NumberTwenty-Four]

I learned more from you than I did from 2 hours of searching on Google… You helped me in a way that Google couldn’t! And these days where Google is an important part of our lives, that is an incredible achievement in my opinion! Very good, sir!

[iiriishshweetiie]

Excellent explanations, made so much sense. Thank you!

[bryanhauschild]

So when the separation of airflow from the top of the wing reaches the center of pressure, is it at that point we reach CAOA? Is it at that point we begin to loose lift? Is the point we begin to loose lift considered a stall, or when a wing actually drops?

[SangitaKumari-pypt]

Can u make a separate video on centre of pressure/lift to make it more

[techyou]

angle of attack for cri cri equal how much

[carmelpule]

Wings fly because of the physical actions and reactions that occur between the distributed heavy, sticky, elastic, sealing, connected viscous fluid particles existing around the zone in which the wing exists. NOTE THE IMPORTANCE OF THE MASS AND THE STICKY, SEALING, ELASTIC, VISCOUS, CONNECTING PROPERTIES OF THE FIELD AROUND THE SURFACE OF THE FLUID PARTICLES, INCLUDING THE RELATED FIELD PROPERTIES AROUND THE SOLID WING ITSELF WITH ITS OWN MASS AND AREA OF EXPOSURE.
The mass and other properties making up the air particles can create a compression zone if the fluid particles move towards a stationary object with, its own mass and area of exposure, or the stationary fluid particles are approached by a moving object.
The mass and other properties making up the air particles can create a suction zone if the fluid particles move away from a stationary object or the moving object moves away from stationary fluid particles.

In all the cases mentioned above note THE IMPORTANCE OF A FLUID BEING TREATED AS A CONNECTED SYSTEM WITH AN EFFECT THAT IT COULD BE TREATED AS A IMPERVIOUS MEMBRANE WITH AREA AND WITH MASS, APPROACHING OR RETREATING FROM AN OBJECT WITH ITS OWN MASS AND A LARGE AREA OF EXPOSURE.

Note no compression nor suction zones can be created if the fluid air particles and the wing did not have BOTH an effective MASS and an AREA OF EXPOSURE. Pinpoint masses approaching or retreating from each other cannot create neither compression nor suction zones between them. A lump of dry loose sand or gravel particles are thrown at a wall will not create an effective compression zone before them nor a suction zone behind them because they do not have the sealing property of acting together to form an impervious flexible membrane.

In a stall, the state of the air particles with respect to the shape of the wing at the time will create a fierce suction zone which will rip the effective sheet membrane effect of the fluid particles for these to become like individual sand particles and the membrane suction effect is lost, thus lift is lost. A heavy suction effect can stabilize a vortex of fluid circulating around it, but this closed circular membrane effect of fluid does not help in flying, and lift needs the fluid to act as an impervious sheet membrane with distributed mass. If the membrane effect of the fluid is lost to high suction zones, then particles will be like sand with mass but not enough exposed area to make a large weighty floating piston effect to pull or push at to create the required accelerating forces with compression or suction effects around the wing. ( Enough suction in a stall)

Note that what was described above can occur not only because of a high angle of attack but by other states as in, sideslips, wingtips, elevators, ailerons, rudders, spoilers, flaps, slats and even protruding rivets and extended undercarriages, dive brakes. It could also be affected by side winds, wind shear, and other turbulence and ice on wings and heavy raindrops disturbing the state, the wing was designed for.

[iosor]

I do agree the best explanation ever. Thank you and make some more videos.

[streakurt]

I know plane gets into the stall in any air speed once it reaches the critical angle of attack. And as you mentioned when plane excess its critical aoa it will start significantly losing amount of lift. But how we can know the what air speed that you reach critical aoa with, can not produce any lift (0). An example, reaching critical Aoa with 300 should give you still still lift but reaching critical Aoa with 150 might not give you any lift. How i can know this (0) lift critical Aoa air speed ? Thank you !

[gregpodrasky]

So do crosswinds and tailwinds factor into airfoil stall

[cn]

Hey Eric I'm enjoying videos and following the FAA test prep along. Did you mean the Bernoulli effect or does the Venturi (carburator) effect also apply to air pressure over the wings? Thanks