[Youtube Review][Veritasium] How Does A Wing Actually Work?

(Recommended)Popular Videos : [Veritasium] How Does A Wing Actually Work?

 

This time, I will review the popular YouTube videos.

These days, even if it's good to watch on YouTube, sometimes people skip it or don't watch it if it's too long.

When you watch Youtube, do you scroll and read the comments first?

To save your busy time, why don't you check out the fun contents, summary, and empathy comments of popular YouTube videos first and watch YouTube?

(Recommended)Popular Videos : [Veritasium] How Does A Wing Actually Work?

https://www.youtube.com/watch?v=aFO4PBolwFg

 

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Playtime Comments : [Veritasium] How Does A Wing Actually Work?

Da*************:

0:52 "That's not Wright!" hahahahahahaha

Pr***********:

0:52 I see what you did there :D

Es***********:

2:08 I have been diagnosed with cancer

Ma**********:

This whole video was great, but 0:37 is my favorite! 

Li**:

I learned more about planes in this 2:50 video than I did in 2 weeks of learning about planes at school.

Ti*******:

Actually I re-watched it, and although you don't explicitly say it, it seems like at 2:00 you are implying that the only thing wrong with the explanation is the speed of the flow; not the direction of the streamlines too. Anyway, it would be nice to have an animation of how it really is for horizontal wings!

 

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Top Comments : [Veritasium] How Does A Wing Actually Work?

Au******:

still dont get how a wing works

Ac*****:

what was better at the beginning of the video when he says "wait!......... that's better" ????!!!

I*:

The Bernoulli explaination sucks.

mi*******:

the truth is that as air passes over the wing it strips electrons off the molecules, creating a wing that has a positive charge. As the earth is also positively charged it repels the wing away from it!! Problem solved. That's why Dennis Lillee would rub the ball on his pants before bowling and thereby give the ball more lift. Genius! That is also why all you people that produce negative comments on YT will never go places....

Gh********:

you still didn't explain how aireplanes fly upside down or how nearly flat wings can fly a plane

Ma******************:

If I say 'centrifugal force' everyone will get very upset because the acutal force is not centrifugal, the force is centripetal, the reaction is centrifugal. However, if I say 'lift force' nobody has a problem... except I do, you should too! Lift is a reaction, an equibrant of the force that an aerofoil imparts onto the air. To be even more precise, lift is a vector component of the total reaction of an aerofoil interacting with the air.

The aerofoil has kinetic energy, it imparts that energy onto the air; the force is generated by the aerofoil interacting with the air as it moves through it. This video describes the air having kinetic energy and acting on the aerofoil, which is incorrect unless you are in a wind tunnel. The force is produced by the aerofoil moving through the air and it has an equal and opposite reaction, the total reaction, the 'vertical' vector component of the total reaction we call lift (although, lift may not always act vertically - another simplification, I'm not going there today). This is never described very well in any text book, it is always "simplified" to the point that it doesn't describe reality and causes unnecessary confusion.

Gr********:

Does this mean that the song "Wind Beneath My Wings" is aerodynamically incorrect?

Ja**********:

So Equal transit time isn't true after all?

au*****:

The Air above the wing MUST go faster? Why?

Sm*************:

Fantastic video. Equal transit time explained away quickly and simply.

ji*******:

wroooooooooooooong. sigh

Mi*************:

There is a fundamental issue with this explanation and that is the assumption that the Bernoulli theorem (and it is simply a mathematical construct that describes a physical phenomenon) "causes" the lift.  No, it does not cause the lift.  In a dynamically closed system, a fluid moving into a region of lower pressure must accelerate because it is moving down a pressure gradient.  Thus, each fluid parcel is experiencing an unbalanced force, but its resistance to that acceleration "pushes back" at the higher pressure, maintaining that pressure gradient.  

Now, when the air passes under the wing, the streamlines of fluid parcels are deflected downwards.  This is because the underside of the wing directly deflects the adjacent fluid parcels downward.  These exert a pressure on incoming parcels that causes them to slow down (accelerate in a forward direction, or against the direction of flow).  Their resistance to this acceleration generates the pressure gradient under the wing and the pressure gradient generates the acceleration.  Reciprocal cause and effect.  Most people can intuitively understand why the air passing under the wing must be deflected downwards and why it must slow down.

However, the "cloud" of increased pressure under the wing also extends slightly forward of the wing, as well.  Fluid parcels approaching the leading edge that are destined to pass over the wing are initially deflected upwards by that "cloud" of increased pressure extending below and in front of the wing.  As they pass over the leading edge and top side of the wing, the individual air molecules would continue in a straight line up and back, but air is a fluid and collisions between air molecules are common.  Thus, the air that has been deflected upwards is now being forced by the air above it to accelerate back downwards to follow the contour of the upper surface of the wing.  That air's inertial resistance to that downward acceleration causes it to form a "bubble" of low pressure above the wing and that same "bubble" of low pressure causes the acceleration that the air's inertia resists.  Again, reciprocal cause-and-effect.  

The Bernoulli theorem is a mathematical construct that describes the way that fluid parcels must accelerate as they move from high to low pressure (and vice-versa), but it does not, in and of itself, explain why

An***********:

A bit confusing and not that acurate! Sorry.
Keep on the great work with your videos.

Ma*************:

but you should know that bernoullis principle can be applied between two points on a stream line. There exists no stream line connecting top and bottom, to apply bernoullis principle and examine the velocity and pressure dependency based on that

Br*****:

Air flow on the top and bottom surface of a wing don't have to meet up simultaneously at the trailing edge, there is no physical law stating that. You have just presented one of the most common misconceptions on airfoils.

https://www.grc.nasa.gov/www/k-12/airplane/wrong1.html

He*******:

Well. That was a little confusing

Da*************:

No discussion of lift makes sense without discussing the Kutta Condition and the effects of viscosity...

1d******:

I am an Aviation Professor.  You have summarized about 2 weeks of my classes in 2.50.  Well done.  Both are "correct," but not the common "mythconception" of Bernoulli's Principle that does not include the deflection of air downwards.  The laws of Physics are not in conflict, and if they appear to be, it is because we misconceive them.

Va*******:

Veritasium: We will answer the question in this video: "How does a wing actually work?"

Veritasium 2 minutes later

Veritasium: We did not actually answer how wings work.

mu*********:

But ... the Bernoulli and Newtonian explanations aren't "two different ways of looking at the same thing". They're two different elements, two different contributors to the sum total of lift. Two different ways of looking at two different things.

Jo********:

Finally a good explanation! If only the TV channels like Discovery, NGC and so forth could learn how it works I would be glad.

Je****:

According to the comments, noone really understood this video nor knows how "it really works". still it has only 221 thumbs down? I like veritasium, but this video is just terrible.

za*****:

the faster velocity air on top of the wing, does lower the pressure.... it has NO bearing on the air traveling under the wing. in fact, if you blow over a balloon, the balloon will rise...   proof of Bernoulli's principles..    if you defect air by pointing air underneath a wing, it will lift too...  both Newtonian and Bernoulli's principles are correct and work in concert with each other.  the air doesn't have to meet.. that's why there is wing tip vortexs and drag flow curls at the trailing edges of wings. air moves to differential pressure and that's what happens as a wing passes through the air.... this video is silly as it talks about flat wings.... flat wings make no lift(non air foils)  but, when you tilt the surface, it becomes a surface with lift and drag coefficients.   Most importantly, why does an airplane have the ability to fly upside down???  simple.... it is the angle of attack of the wing that determines its lift/drag characteristics, and in what direction that force is generated.   NOT the shape.

S*:

1) Place hand outside the window of a moving car with the thumb facing in the direction of movement.
2) Rotate hand to change its angle of attack.
3) Figure out what angle causes your hand and arm to lift.
4) Find out that your hand has been ripped off by a mailbox.
5) Weep the loss of your dominant hand.
6) Learn to function in daily tasks with your other hand.
7) Forget how lift works.
8) Place hand outside the window of a moving car with the thumb facing in the direction of movement.
9) Rotate hand to change its angle of attack.
10) Find out that your only hand has been ripped off by a passing dump truck.
11) Forget how lift works.
12) Lean out the window of a moving car.
13) Rotate torso to change its angle of attack.
14) Figure out what angle causes your torso to lift.
16) Here lies a dreamer who loved to fly.

Na********:

I always hated the explanation that the air meets back up at the back of the wing. It's seems to imply magic, or that the air is alive

Fl*********:

My grade 7 self who did his science fair experiment on Bernoulli's Principle just had his mind blown :)

No**********:

hmm yes so why does the air above speed up?

Jo********:

This is actually an incomplete explanation. The greater velocity along the top, in short, is created by vorticity around the airfoil. The trailing edge of the wing creates a vortex and conservation of amgular momentum dictates that another vortex must be created in the opposite spin. This vortex around the airfoil causes air to move faster along the top.

The math is pretty complicated, but there are good walkthroughs online.

Ma********:

I am studying aerodynamics for years and I can see a lot of crap in the comment section

Os*****:

I am too an aerodynamics professor, and I must say that this video has got it all wrong.

Ho***********:

Great vid Veritasium/MinutePhysics! Can't wait to do a vid with you guys!
How Ridiculous

 

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[Veritasium] We gathered comments about popular videos and looked at them in summary, including play time, and order of popularity.

It's a good video or channel, but if you're sad because it's too long, please leave a YouTube channel or video link and I'll post it on this blog.

 

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