Understanding Aerodynamic Lift

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Information Understanding Aerodynamic Lift

Title	:	Understanding Aerodynamic Lift
Lasting	:	14.19
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Comment from : The Efficient Engineer

It's precisely this complication of a simple thing that doesn't let you understand lift search Tekemon on google, you'll be surprised
Comment from : Synergy

Actually, many aircraft do NOT lower flaps fpr take off!
Comment from : George Morris

George Cayley made something so revolutionary
Comment from : Ryan collects

Decades ago, they installed air pressure sensors above and beneath a Cessna's wings With simple pressure data and math, a C-172 would need to achieve over 400mph, just to get off the runway So lets stop talking air pressure differentials
Comment from : Mitch Gingras

110 years later, they still haven't figured it out Amazing! Isn't it?
Comment from : Mitch Gingras

Aerospace engineer here I appreciate the video but the Bernoulli explanation provided at 6:08 is surely faulty The pressure doesn't have to fall For the Bernoulli's principle to be true the following conditions have to be met: br br1 The fluid has to be incompressible Air IS a compressible fluid ❌ br2 Most importantly, the process has to be Adiabatic (there has to be no transfer of energy between air and the wing) and reversible which in here it is certainly not In other words the air flowing around an airfoil is not a closed system! You cannot use a simple Bernoulli's to explain lift ❌ br brWe currently have to institutive understanding of aerodynamics and specially the lift and drag forces You'd have to use three laws of Newton in conjunction with three laws of Euler for fluid dynamics (conservation of Mass, Energy) to explain these forces And yes, it's harder than rocket science
Comment from : Aerospace Engineer

can you please further elaborate on how the conservation of mass works in that context? but have to agree great explanation
Comment from : Shreedevi Anantha

Good one, well donebrDoug McLean's video on misconceptions in aerodynamics is worth watching next 😊
Comment from : Erik Tempelman

As a person who wants to study aeronautical engineering i am so thankfull for this explanation Thanks to the animation of newton's third law i have finally been able to intuitively comprehend what creates lift Amazing video and simply amazing content
Comment from : PPS_pov

Survival of the fittest is the law ruling over each creature in nature Suppose this theory is correct, our invention must imitate animals of how they have been successful adopting themselves in hostile conditions Airplane is one of them, eventually we are going to copy the motion of birds, and the way they have been adjusting when flying under the same circumstances with the same pressure force friction stress all acting onto the flying object in space
Comment from : 주명화

but how does the airfoil do the circulation thing?
Comment from : So swag

Okay but like, if the angle of attack is high, doesn’t this compress the air under the wing so that it has to go faster, thus being lower pressure
Comment from : Fish Sticker

A disclaimer, just to remember that Alberto Santos Dummont was the first person to flight a real airplane! 😆😆
Comment from : Rafael Pacheco

Great video
Comment from : Abel Fernandes

aerodynamics is a lie it does not matter what type of wing used flat wings fly Just as good anything can fly if surface area is the right size to weight ratio air foil theory and aerodynamic theory is a science of the wealthy to want to make technology expensive so that only rich people can produce airplanes the hobbyist would be excluded to make planes as he can not afford the manufacturing of such a special wing design of the theories even a small kid could make a working full size airplane at home if he was taught the real science of lift simply put like how we make a paper plane and why the paper plane fly and how bird wings are like paper planes does not matter if the wing is rigid or elastic hang gliders does not have aerodynamic wings the reason why you can fly a kite is that aerodynamics is a lie
Comment from : Primodernious

Angle of attack
Comment from : Michael Ripplinger

Cool
Comment from : Kevin Yang

Fantastic animation！　I’ve studying aerodynamics as a university student and this Video is including many sections' essence it very helpful for me(≧▽≦)
Comment from : ひでひで

no
Comment from : KlubMusiX

inverted flap suck ?
Comment from : KlubMusiX

it make lift void right?
Comment from : KlubMusiX

it thrust pushing force maintain increase energy forces flowing
Comment from : KlubMusiX

enable seperated layers of energy spliting to allowed difference direction energy has splitting over laid layer as two water flow by but dont mix
Comment from : KlubMusiX

it just direct deflect energy flow inbetween layers
Comment from : KlubMusiX

wing suddenly became illrelavent right?
Comment from : KlubMusiX

concord
Comment from : KlubMusiX

wat of lift in the statosphere?
Comment from : KlubMusiX

wat about cigar shape missile?
Comment from : KlubMusiX

i think this cant stand if you add rotating rotor in as wing dynamics on low water surfaces has a difference ground surface tffect yet one can divert up differenceli
Comment from : KlubMusiX

fine fancy words dont mean shit
Comment from : KlubMusiX

1 ontop is smaller wing
Comment from : KlubMusiX

inverted hang wing?
Comment from : KlubMusiX

how ?u mean tail or angle?
Comment from : KlubMusiX

it has 2 wings front back
Comment from : KlubMusiX

Lift is action and reactionbrThe action is the deflection of air molecules downwards, the reaction is the wing being pushed upwards Pressure differences are secondary If there is no downflow of air from the wing, there is no liftbrbrR
Comment from : Ralph Ellis

very nice explanation for airfoil lift
Comment from : Geoffrey GEOFFREY

According to a novel approach, based on Potential Flow Theory, the lift (and drag force) generation mechanism is due to the additional circulation/detached vorticity from the entire surface, not only along its edges (eg, wing tip vortices) In fact, such approach is very intuitive since the detached vorticity should not be confined only to certain regions due to a continuous medium assumption of the surrounding flow You can find the recently published article (The Full Multi-wake) in "Advances in Aerodynamics" Journal
Comment from : Carlos Pimentel

Suction force?
Comment from : appa ho9tel

Explanations of lift always make it seem so confusing It's really quite simple yeah? There is more air under the wing than there is above it, that's it More air molecules are pressing against the bottom of the wing than against the top, so a net upward force is generated You can feel this effect with your hand first point your hand out like a symmetrical paddle and "poke" the air straight ahead of you and you feel nothing, no difference between the top and bottom of your hand This is a symmetrical airfoil at zero angle of attack, so no lift is generated Now instead cup your hand to give it a bit of camber and swat the air you can feel the air press against your palm meanwhile there is no force against the back of your hand That's lift you're feeling, isn't it? And if you do this in high winds you'll even notice that based on the camber and angle of attack of your hand you can catch the wind such that it's strong enough to push your hand upwards It's very intuitive to understand you're basically scooping air into your hand, which of course results in more air pressing against your palm than against the back of your hand, which results in an upward force
Comment from : Navak

You made everything more complicated and difficult to understand!
Comment from : Zbigniew Brzezinski

Concise, complete and elegant!
Comment from : Lout Sont

amazing, i am just in eighth grade and i understood a lot about this, of course its hard to grasp evrything at once but it is a good and stepwise explaination
Comment from : Arihant Pro

Best, nuanced but simple video 👊
Comment from : LITERaiLLY

Excellent ❤
Comment from : Julio Santos

Excellent Although I'd like to see some greater mathematics for the airflow, along the wing - from leading to trailing edge Is this possible?
Comment from : Ian Rivlin

7:14 The flow tendency to round the trailing edge creates separated vortices left in the wake, the sum of the vortex strength is precisely the opposite of the circulation , due to angular momentum conservation
Comment from : Arturo

4:54 The figure is wrong, The lift on a flat plate is on the quarter chord in subsonic flow, different from supersonic flow, where indeed the center of pressure is in the chord center
Comment from : Arturo

At the trailing edge the pressure and the velocity outside the boundary layer are EQUAL above and below the trailing edge The figure needs to be corrected!
Comment from : Arturo

0:05 the first airplane was the 14-bis
Comment from : arturzimplayerpro

Coanda effect? And you didn't explain slats
Comment from : Michael McGovern

Shoving air down shoves the plane up The foil shape doesn't cause it; it just makes it more efficient
Comment from : Michael Coffee

Best Explanation!!!Good Job Man!!❤💯
Comment from : Karthik Bhasi

As above so below
Comment from : Rolando Tillit

The ultimate reason that explanations tend to be poor for lift is that most study of lift focuses on the observed results and observed phenomena without really looking at the actual mechanical physics that are going onbrbrAs a simple case and point: Suction doesn't exist There is no such force, rather it is an observational phenomena, that is from our perspective as an observer it bappears/b as if there is a pulling force In reality suction is the exact opposite a pushing force Eg in the context of a straw, you aren't pulling the liquid up, rather the air above the drink is pushing the liquid forward, you have merely created a space it can be pushed intobrbrAn airfoil is a shape that controls the total displace of air around it in such a way that the net of forces is positive on the wing and negative on the airflow As the wing moves forward a low pressure region is created which both pulls the wing up but also critically pulls the air above it down Just as critically however is that the shape mitigates any conflict between these two pressures, the air is pushed behind the wing so that the downwards and upwards forces minimally clash not only preventing any nullification but even amplifying the total lift force
Comment from : TheWhiskyDelta

2023 anyone
Comment from : Shivam Verma

Succion pressure ?
Comment from : Michel André

Thanks!!
Comment from : GUZZLER

4:17 You lost me at "suction pressure" Not a good scientific phrase!
Comment from : The Dub Whisperer

Bernoulli effect The real thing to understand relative to this are the differences between conventional and laminar flow airfoil designs and their effect on lift at different airspeeds, angles of attack, angle of incidence in design of the aircraft, and characteristics in various maneuvers
Comment from : David Brattain

this is a masterpiece! thank you for sharing!
Comment from : SABO studio

Could this be applied to submarines cause you are saying fluid
Comment from : Unpurist

You said that without a pressure differential there can no liftHowever, this is like saying that without lift there can be no lift Or, lift causes lift Lift is a reaction force, not an initial action force It is deflected air that causes lift Without this, there can be no lift A pressure differential doesn't cause lift but rather, is lift, caused by deflected airbrThe action is the deflection of air, which results in a pressure differential or lift A pressure differential doesn't cause lift, but rather, is lift caused by deflection
Comment from : Eric Larue

A pressure differential does not cause lift But rather is lift caused by air deflection The cause of lift is deflected air Without this there can be no lift
Comment from : Eric Larue

Overall one of the best videos I have seen on this topic, because you mention Newton downwash b*and*/b Kutta condition and the superposition of vortexes that increases the airflow at the top (Kutta–Joukowski) brThree improvements: br- It should be mentioned how much each factor contributes to the lift of an airfoil, because of course both are important and generally the Newton downwash part is more significant than the pressure partbr- You should not have mentioned streamline pinching This explanation is bad for various reasonsbr- You do not really explain why the circular superposition vortex actually exists You say it's because of the Kutta condition, but that only explains why the rear stagnation point is at the tail not why there is a vortex brbrEDIT: The more I think about it, the less I think your explanation is good Because what you are basically saying when you talk about Kutta and that the air would go around the tail and to the top, you are assuming equal transit time to make your argument work Otherwise the air would not have any reason to go to the top But we know that is totally wrong So no, Kutta condition is certainly not the reason why the air travels faster at the top
Comment from : whuzzzup

I dunno Sum people say the air pushes wings up, others say the vacuum sucks up your wings "Lift" is like for tall buildings, no?
Comment from : Jack Selvia

molecular density at progressive sonic boom math charting is epic mack -19 is amazing amazon kicked it with kirk detailed sonic discharge chart point linear incline progressive's chart failure divergent rate of entropy failure non-intuitive energy remnant at sonic discharge point charted in theory i never haqd the fresh final daTA SET SO I ASK?
Comment from : ronald jorgensen

All wrong explanations just to make it fancybrThe more air goes under the wing and it pushes it upbrIts more like push than liftbrYeah but you cannot make a 15 minutes video that way 😅
Comment from : A man that thinks

FOILED FILTER TIRED QLUXJRUVY
Comment from : Jhas No

JPQUNq XUQ XYON VUCK Q XUV JQ XYON TION CKUM
Comment from : Jhas No

See Coanda ( Henri) efect !
Comment from : Costa Stefan

People really like to overcomplicate things The pressure differential (vacuum-like suction) of the upper side of the wing due to the angle of attack is the primary mechanism that generates lift It's all about the negative pressure from above the wing and the positive pressure from below the wing Talking about air that moves faster from one side etc, only complicates things, unnecessarily
Comment from : BState

I am in class 11 and i've been watching these videos for a while I just love how he explains in a simple manner by breaking down complex topics into simpler ones Although there are meant for mechanical and civil engineers, it also helps us slot Keep posting these type of educational videos in an animated manner Love from India❤❤
Comment from : Asmita Kumari

Current aerospace senior, I have “learned”(the best a struggling engineering student can), and seeing your video helped me understand how all these concepts tie together Learning everything in detail was a headache and stress inducer, but taking step back and seeing the broader picture has made me realized I actually learned a lot Great job keep up the awesome work
Comment from : Jose Rivera

Very concise and effective explanation Thanks for this
Comment from : carapo66

I used this video for a High school english project, hope i get an A
Comment from : Required_Resource

Thanks I got New Youtube Channel from This Video to learn more knowledge
Comment from : Saniya Sachin

Some good stuff here, but all is confusion if you neglect Newton's Third Law Barely mentioned here at 8:45, it is the key to finding a firm base for understanding ALL aerodynamics Realize that airfoils by definition have only air as a working medium to generate force If you want to generate a force in a particular direction on an airfoil moving through air, the ONLY way to do it is to accelerate a mass of air at a particular rate and in a particular direction opposite to the intended force If you want upward lift on the wing, it must force a net mass of surrounding air to accelerate downward If you want a rudder to generate a left force, it must accelerate a certain mass of air to the right If you want a jet engine turbine bucket produce a force rotating the turbine wheel clockwise, it must deflect moving exhaust gases in a net-counterclockwise direction Yes, pressure differences are real and demonstrable and effective, but in an overall view, it helps to back away and realize that everything boils down to the acceleration of masses of air, or other gases I hope this is more helpful than learning the unpronounceable names of great but mostly dead physicists
Comment from : Hopelessand Forlorn

cool !
Comment from : Teh Soon Guan

6:00brWhat caused 100 of the 'particles' above the depicted airfoil to accelerate? brThis seems very misleading I accept that it is potentially an exaggeration to make a point but misleading none the less brIt almost seems like the 'particles' above the surface where mis-coded made accurate, the 'particles' farther above the depicted airfoil would actually remain closer to their original velocity as their distance from the airfoil increased
Comment from : Daniel Wackerman

Incorrect explanation Full explanation here: youtube/dgE9xhIjTOU
Comment from : Alan Smith

4:18 What's a suction pressure?
Comment from : EjaxPlus

The Bernoulli's principle makes more sense because if you take a paper A4 sheet and put it under your mouth and you blow the air above the paper it will lift, even though there is no movement of air underneath it
Comment from : Leonardo Forcinetti

Hands down the best explanation on the topic that I have come across
Comment from : MrSidney9

Overall very great video! However, one thing that is important to mention is that the lower air pressure does not "suck" on the airfoil as is implied by your pressure distribution illustration, but rather that the lower pressure on the top surface is pushing less on the body than the higher pressure along the lower surface
Comment from : Sepehr Hosseinkhani

can u please answer my question about one detail regarding the pressure distribution, shouldnt be the arrows on the upper side face downward? since the air stream is deflected to the top?
Comment from : Looper

This is the best presentation I have seen for lift so far! I really appreciate you emphasizing that this is only a very small portion of the physics of lift, there is much to be learned
Comment from : Calum Walton

I appreciate how you acknowledged the complexity of the topic and that there can sometimes be a clear cause-and-effect relationship between the different phenomena involved in generating lift brYour exploration of both Bernoulli's Principle and Newton's Third Law as valuable insights into the understanding lift, while also pointing out their limitations, helps avoid falling into the pitfalls of common misconceptions brI suggest briefly mentioning the common misconceptions about lift, even though your video does not rely on them This would further educate the audience on the subject and create a more comprehensive understanding of lift brOverall, great job! Your video is accurate and informative and offers a balanced explanation of lift generation Keep up the excellent work!
Comment from : alejandro castillo

I liked that you stated any object with a pressure difference will generate lift The flat plate at an arbitrary angle of attack was a good example of this I want to give some minor feedback to your video You mention the pinching of streamlines is related to the increase in velocity along the upper surface of the airfoil I want to point out that this is not completely correct But, it is true that the velocity will generally be higher in this region However, attributing this to the streamline being pinched is an explanation best used for internal flows This also does not account for streams further to the airfoil surface in the normal directionbrbrGenerally, the streamlines are deflected around an object due to the (airfoil) geometry or pressure forces in the field around the airfoil This deflection is associated with an acceleration of the fluid element, which causes the streamline curvaturebrbrThis is a great video, thank you for sharing this content with the world I have seen quite a bit of your videos and the quality is always there Keep up the good work!
Comment from : EJ Douglas

Great Video explaining the basics of lift generation, your explanation of the concept of pressure difference and Newtons 3rd Law caused by downwash was brilliant and the graphics were helpful in visualizing the concept I would have loved to see more information on the misconceptions surrounding the generation of Lift such as the use of Bernoulli’s principle
Comment from : Anirudh Menon

The illustrations in the video was great You dived deep into the concept of the pressure difference producing a net forcee that causing lift in the airfoil One thing I didn't agree with the pinching of flow at the leading edge causes the velocity to increase This would be the case for internal flow in a pipe, but not always the case for flow around an airfoil
Comment from : Matthew Ajlouny