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

[@Leqendjusten]

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

[@carmelpule1]

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.

[@annakquinn7084]

Wikipedia has entered…

[@carmelpule6954]

@@annakquinn7084 Wikipedia may be helpful. Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation. The process of sharing knowledge is what differs humans from animals as one need not go through the experience himself to know what exists in the universe. People who share knowledge, normally respect each other for it. Animals rule with their muscles and primitive fighting instincts while humans rule with their developed minds, all due to sharing their knowledge with others which could be debated and discussed before an agreement is reached. Unfortunately, there are still many people who prefer to kill the messenger rather than to try and understand the message.

[@annakquinn7084]

@@carmelpule6954 Wikipedia replied

[@carmelpule6954]

Carmel Pule,' do not waste time and effort and just let others weigh the value of the contributions in these comments.

[@xNecromancerxxx]

@@annakquinn7084 Bahahahahahaha good one! 😂 😂 😂

[@Watchandcutgearchannel]

Great 👍 video 😊

[@tech4you159]

angle of attack for cri cri equal how much

[@AVTBJJ]

Subscribed. Fantastic job teaching!!!

[@flyaeroguard]

Hello, thank you for subscribing! We are glad you find our videos helpful and hope they continue to be a valuable resource for you!

[@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 !

[@flyaeroguard]

Hi Yusuf, thank you for reaching out with your question! An aircraft manufacturer will test the aircraft in specific conditions to determine stall speed at various configurations. These will be listed in the aircraft’s Pilot Operating Handbook. However, stall speed can be affected by abnormal weight, center of gravity, and load factor. These factors can cause the stall speed to increase in what would be known as an accelerated stall. There are equations that can determine the stall speed in a given condition, however, it is not necessary to calculate these for day to day operations. Thank you!

[@bryanhauschild4376]

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?

[@iiriishshweetiie]

Excellent explanations, made so much sense. Thank you!

[@flyaeroguard]

Glad it helped! Thanks for the feedback!

[@SangitaKumari-py1pt]

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

[@christopherhaney]

This was a great explanation! Ty

[@ssskkk2329]

Pen ,open ,close😃😃😃

[@clareleverage7119]

so helpful, thank you so much

[@amireslami91]

thanks for your help

[@sarcasam544]

Best Explanation !

[@iosor7524]

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

[@flyaeroguard]

Thanks for watching! New videos are on the way!

[@gregpodrasky110]

So do crosswinds and tailwinds factor into airfoil stall

[@flyaeroguard]

Hi Greg - a crosswind or tail wind will impact the ‘relative wind’ experienced by the airfoil. Additionally, an airfoil doesn’t know the difference between a sustained wind and calm wind. That is to say only a gust of wind would have an effect on the relative wind of an airfoil. If it is a constant wind, regardless of direction, the airfoil will act the same. If it is a gust of wind it would impact the airfoil based on the direction it approaches the airfoil. A gust of wind is really going to result in a change in the velocity of the relative wind. This changes the lift production of an airfoil, but doesn’t directly impact the angle of attack. As an example, if an airfoil suddenly experiences a gust of tailwind, it would result in a reduction of speed of the relative wind. That would result in less total lift being produced and the pilot would need to increase the angle of attack in that moment to sustain equal lift.

[@cn9936]

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

[@flyaeroguard]

Hi, there! These two terms are nearly synonymous. That is to say that the “Bernoulli Effect” that you refer to is more the physical principle that explains how a venturi works. A venturi is a working example of what Daniel Bernoulli’s principle states. When we talk about air flow over the wings, the venturi effect is created between the free stream of air above the wing unaffected by the airplane and the upper camber of the wing.

[@cn9936]

@@flyaeroguard Ok I appreciate your response. Thank you. Will you transition to a simulator or an aircraft in future videos? That would be great! Thanks.

[@flyaeroguard]

We passed your request onto our team. Thank you for the idea!

[@cn9936]

@@flyaeroguard I appreciate it. I plan on joining you guys for my ratings and certificates and have seen videos by other instructors which are very helpful. Thank you.

[@flyaeroguard]

We're very glad we could help you!

[@xNecromancerxxx]

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!

[@flyaeroguard]

Thank you very much, what a great endorsement!