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- เผยแพร่เมื่อ 9 ก.ย. 2024
- Make your own paper plane wing, learn how it works and generates lift. Use a hair drier and watch it take off. Fun aerofoil science experiment for kids to try at home. We look at Bernoulli's principle and Newtons third law of motion. More Fun Science Projects: • Denser Than You Think ...
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What was the last flight you went on? Where did you go?
FIRST
Uhmm in malaysia
To see world cup in *ENGLAND* 🏴🏴
Hi
Sweden 🇸🇪
You missed the horizontal stabilizers in the drawing. Without that, a plane is uncontrollable.
The only exception is the concord. But yes the elevator is for pitch/up and down.
@@progamingyoutubevloger6620 that's because of the very wide wing shape, a concord can be controlled with elevons. This means that the ailerons can be the elevator at the same time. Horizontal stabilizers weren't needed because the wing was so wide: from the front to the tail. The plane he showed can't miss the horizontal stabilizers.
I added them as you suggested and it works better, thanks!
I noticed it too 😂
@@progamingyoutubevloger6620"the only exception is concorde"
They are many more who use elevons so yeah.... mainly with delta wings but yeah
Does anyone else legit just watch these videos but are too lazy to actually try and make it lol
*_PRETTY COOL HUH_*
yeah me
This was just fuckin stupid kids woe do this they am into iPad n ps4 or xbox
I don't have any hairdryer. Would you like to bought me one?
Me to
@Adrian 20 braćova only saying wha I think kids today they ay like how it was 15 years ago 20 ago
Dave, Thanks for explaining that Bernoulli's principle is a mis-applied and incorrect explanation for wing lift. The Coanda effect , or "Wall Attachment effect", is responsible for the laminar air flow on the top surface to follow the contour of the wing (if the angle if attack is not great enough to stall the wing).Proof experiment: gently hold a soup spoon with its convex surface slowly nearer and nearer to a running faucet's stream of running water. As soon as the water stream just touches the backside of the stream, the Coanda effect will attach the stream to the spoon and instantly pull the spoon (lift!) closer to the stream. The fluid pulls the air out from the boundary of the spoon and the water creating a low pressure area which allows atmospheric air pressure to push the spoon and water together. You will have created "horizontal" lift. Key point, the resultant water flow is now flowing in a new direction. THAT is the downward reflection of air coming off the trailing egde of the plane. If you put pressure gauges on the ground under the flight path of a plane just taking off, a higher pressure will be momentarily sensed. Now hear this: the total mass of downward moving air coming off the trailing edge of a flat or airfoil shaped wing is equal in that instant, to the TOTAL WEIGHT OF THE AIRCRAFT. Fly a giant imaginary scale under the plane as it is flying and it will measure most if the weight of the plane as it is flying....the giant air cushion is there. Wing tip vortices are simply the faster downward moving air and the realtively level air near the tips if the wing attempting to re-join...causing dangerous for too-close- following aircraft, rotary clear air horizontal rotary turbulence. Who said "Every force has an opposite but equal reaction." ? Right.
Put an entire jumbo jet on a giant scale or table and the plane will transfer its weight through the table to the ground. How else could anything be supported? The push of the wings of a flying plane essentially push down on the air. The faster the air flow the "harder" or more solid the air becomes. Thus , faster plane, smaller wings.
The final question NOBODY is asking is "why are wings fatter in the middle? Elementary dear Watson! Answer: That is where the support spar was when marerial science had provided only limited strength materials. Look at the airfoil of an X-15. Practically flat.
And to make it very clear...planes actually can fly upside down. I learned this when I was 10 years old from flying .049 powered U-controlled (control line) model airplanes that I designed and Not from incorrect science books. I am a pilot.
Nice! i could use this for my science fair! Thanks
The lift force of the wing profile is created due to the difference (difference, Delta) in atmospheric pressure.
Another thing is why two such zones are being created?
The most working hypothesis is that the mass of air elements - molecules - have inertia. And this inertia of the air flowing around the front upper part of the wing creates a vacuum zone behind it, and the oncoming lower part of the wing is a very small seal.
Compaction is a weak force in this pair, and vacuum is a much larger share in the lift of the wing.
This is what explains the behavior of your model in the film.
Dude, now I think he's a professor.😂
ѕαѕѕу Eઙŧɧεя internet
Doesn't that mean you didn't graduate high school?
Im not a nerd nor a smart kid but those things exist in high school
And i am very bad/noob at it XD
@@byeetch Sorry for the late reply.
I knew DaveHax is popularly known for his lifehacks and reviews and this video is clearly not a lifehack but more educational. This content is somewhat new for me to watch coming from his channel that's why I said that, maybe he's a professor in real life. And I graduated high school. 🙌
@@iamsherk2605 Late reply? Bruh it's been 9 months. Also, my point was that at least where I live this stuff is already taught in like, high school rather than in college or university. So a better intepretation would probably be a teacher rather than a professor lmao.
Please folks, this is a simple experiment to understand how physics and an airplane can work. It's kind of silly to ask about horizontal stabilizer and other things that are obviously not relevant since the purpose of this video is to provide a basic explanation. Stop asking nonsense.
Never did I understand how planes really flew until your experiment. Thank you.
My son was studying aeronautical engineering in ICL - he did try and explain a few things, but it flew over my head (haha)!
I knew most things about airplanes
Some of this I learned from you
Thanks Dave
I knew all of the plus some more
i'd like to point out the reason i subscribed. u used the least amount of resources to get the job done. u didn't even tie the rope on the board because the weight was sufficient enough. no extra workhours were needed there. cheers
I really enjoyed this video since it is a bit more science centered and it also has a pretty simple way for explanation that even kids will understand i would like to see more videos like this
An aerofoil cross section is a worthwhile improvement over a flat plate, but only that. A 50p balsa model, from the toy shop, flies well enough with no curvature at all to its wing. George Cayley defined flight perfectly. "Flight is the application of power to the resistance of air".
*PRETTY COOL HUH*
THIS DIALOGUE NEVER GO OLD
(GASP!) The explanation was perfect. I hope you’ll make more educational videos like this one.
You can see that the straw is tilting rightward, so maybe you could reduce friction between the straw and the string if the string was also slightly tilted rightward. great video as always :)
He said he intentionally inserted it w a forward bias for the airfoil to tilt back, unfortunately that wasn’t the resulting behavior
hi im jenil from india i would like to thank you that you made this video for us and i request you to make more videos on this in heavily detailed also some aerodynamics in simple language thx
GREETINGS FROM INDIA
2:00 a.m
no blue!!
weird trick.. now look
2:00 a.
2:00 a.m
1:59 complicated talk
Me: that looks like a whale and some waves... I can’t even draw like that...
Its not complicated if you know a little bit basic physics...its very simple actually.....
Honestly I learn more from this than school
I'm not homeschooled
Great experiment showing how the airflow over the top of the airfoil can aid in the generation of lift. Also, good catch on how the equal transit time linked with Bernoulli’s explanation is false. Expanding on this by further placing an airfoil in a wind tunnel it can also be observed that the pressure in the Flow-field is the same around the airfoil (sourced from How do wings work? Holger Babinsky 2003 Phys. Educ. 38 497), thus further showing flaws in Bernoulli’s explanation of lift.
I think I'm going to say this is the best lift video on youtube right now. At least from my perspective. The flat bottom curved top shape still producing lift because of the downward resultant flow direction is the key IMO. I still don't understand WHY the flow on the top of the wing is faster and making lower pressure because it obviously is on the smoke experiments. So there is a mystery there, but the resultant force makes more sense to me on why flat bottom aerofoils still lift.
Actually, it is a combination of Newton's 3rd law, and the Coanda effect that makes a plane fly, not the Bernoulli principle. The Bernoulli principle is only applicable in a closed tube.
That's not correct either. There is No Coanda effect near a wing. Coanda is defined as a jet or sheet of air blown into an otherwise still air environment. It also has constant entrainment. The wing has neither of these.
The upward lift force comes from the top-bottom pressure difference. THAT is ALL the upward lifting force.
.
This short video explains the lower pressure above the wing.
Give it a thumbs up if you understand it.
*th-cam.com/video/3MSqbnbKDmM/w-d-xo.html*
.
Lesson 8 - Adventures with Bernoulli - Demonstrations in Physics
th-cam.com/video/HZClP-m9g24/w-d-xo.html
The upper flow is faster and from Bernoulli’s equation the pressure is lower.
The difference in pressure across the airfoil produces the lift. As we have seen in Experiment #1, this part of the theory is correct. In fact, this theory is very appealing because many parts of the theory are correct. In our discussions on pressure-area integration to determine the force on a body immersed in a fluid, we mentioned that if we know the velocity, we can obtain the pressure and determine the force. The problem with the “Equal Transit” theory is that it attempts to provide us with the velocity based on a non-physical assumption as discussed above.
NASA
ur drawing is sooo beautiful I LIKE it
An aeroplane with a symmetrical wing section like NACA 0012 can fly quite easily, and can fly upside down as well. How do you explain this?
The equal transit time theory is correct if the fluid is liquid helium, but no net lift is produced. Can you explain why?
Well explained. I was looking for a good way to explain this to my kids and will try the experiment with them.
Wow, that's so awesome! Thanks for sharing about it! 😉
And the horizontal stabilize?
I was just looking in the comments to see if anyone would notice that
@@liamgeula me too
Fits of all, air does not move past the wing. The wing moves through the air. Big difference.
Downwash at the trailing ede= lift. Period. Other smaller effects (upwash, pressure differences, etc.) are not significant.
Very deducational fir children
Nice
The shape of the wing is not the key point for 'why the airplanes flies'. Aerobatics airplanes has a symmetric wing :D
I could use this for my science fair! Thanks!
Amazing ! Learned from this.
It's wrong.
The category should be EDUCATION
Misinformation.
Im happy you made this channel bc a long time ago i suffered with sickness until i watched this channel thank you so much
You can try this experiment without the hair dryer. Use a length of fishing line(smoother, therefore less friction) about 3-4 ft long. Hold each end of the string in a vertical position with your left hand at the bottom and right at the top. Keeping the string taunt, spin in the direction of the leading edge(front) of the wing. You won’t make a whole revolution and the wing will climb from bottom to top quickly. The faster you spin, the quicker the wing climbs. You can also do this by holding the wing in front of a fan. If you are demonstrating this for younger students (elementary/jr high) it gets their attention quickly. I did this demonstration with my students(7th grade) and than broke into lab groups so they could build their own.
Modern fighter aircraft have fuselages shaped like airfoils to generate lift along with the wings to aid in slow speed stability as well as high speed maneuverability.
Cool project. Just needs a little longer straw
Wish I had found this experiment instead of Pitsco. This is much more kid friendly
u can put vertical tail below too to stabilize for wing from below too
How
@@Wopara tail simply doesnt have to be above. U just need more vertical area behind CG 4 stability
There' s *USUALLY* two wings
...and of course, the engines!Which *USUALLY* hang off the wings
About the engine, depends on the plane
Well yeah, you can have more wings. And engines don't have to hang off
what engines
I’m on a plane rn and there’s just fire and the pilot grabbing on to the wing and we are heading towards a island
@@noobethgamingtonthethird oh you have a lucky plane!That's very rare
yea I’m very lucky
Aerodynamics of an elephant
??
This guy can draw an airplane better than I can 😂❤
Very well explained and demonstrated Sir 👍 Thank you.
DaveHax- Planes generally have two wings...
Me- Yah don't say
Well I thought they had 37. I was completely wrong
Some plane have 4 but ok
My Son Loved This Experiment............He Will Try Sooner Or Later
DaveHx. You are wonderful teacher thanks for sharing this vedio.
Very nice trick of takeoff explained well here ...👌
Davehax the Science Teacher or I mean Physics Teacher
Thank you very much ..,I like this experiment. Good
The maths does not work out. The experiment above demonstrates how little lift is generated by the paper wing on a string, when exposed to horizontal relative airflow (headwind) created by the hair dryer.
More precisely, the experiment above shows that:
- A hair dryer typically produces approximately a 50 km/hr airflow over a 4 cm (0.04 meters) wide distance (i.e. wingspan). This can be verified using a anemometer with any standard hair dryer.
- The horizontal airflow from the hair dryer allows the paper wing with an estimated mass of about 20 g (0.02 kg) to rise relatively slowly upwards.
- This means that a 50 km/hr relative airflow over a 1 meter wingspan, is equivalent to 25 hair dryers (25 = 1 m / 0.04 m).
- The 50 km/hr airflow would generate lift sufficient for only 0.1 kg of aircraft mass (0.1 kg = 0.02 kg * 25) for each meter of wingspan.
- The calculation means that a Cessna 172’s 11 meter wingspan, exposed to a 50 km/hr relative airflow, would generate enough lift for just 1.1 kg of aircraft mass (1.1 kg = 0.1 kg/m * 11 m).
This lift (of 1.1 kg) is significantly less that the Cessna 172’s MTOW of about 1,100 kg !!!
Although, the Cessna 172 stall airspeed is about 90 km/hr. Even almost doubling the relative airflow from 50 km/hr to 90 km/hr, will still not generate enough lift for the Cessna 172 to fly, according to this paper experiment.
The maths does not work out, unless I've missed something ?
Nice practical example
Dave hax
Have you done aeronautical engineering?
I'm an aerospace engineering student, and I'm so impressed by the physics that he is trying to explain, that's so much more than what I get in high school
Nice job
So both principles work?
LOVE YOUR VIDEOS!❤️
Thanks!
Thank you
Hiii we love u ♥️
Thanks!
Wow wow wow this is really encouraging
This is a nice wind tunnel set up, but NO. The faster speed above *does not cause the lowered pressure* . 'The lower pressure is the cause of the faster speed because higher pressure ahead of the wing pushes more, therefore accelerating the air rearward.
If you correctly examine these pressures it should be obvious that it is these same pressures that are the cause of the downwash.
Pressure gradients accelerate fluid; the same as forces accelerate mass. It is Newton's Laws for fluids.
Use two strings spaced side by side and have the string not rub on the straw so much.
(DaveHax Has Posted A Video On 6:18AM, June 14 2019
Yeah so
I clicc fastt
@Noobie The animatronic 😏
You're very good at drawing, DaveHax
What about the 2 small wings at the back of the plane with the flaps?
@Barron Celli don't all planes require them to fly ?
@Adrian Stevanovic Uhm, planes do not need a vertical stabilizer, and the Concorde does not have a canard, so stop spreading bullshit yourself. Are you even a pilot?
@@DownhillCube4 actually, most planes have them indeed to be able to vertically rotate. But some can fly without. Looking at the Concorde, the wing went far to the back of the plane, and had "elevators" next to the "ailerons". The elevator is the part that moves in the back wing, to make a downforce or upforce to rotate the plane vertically. The Concorde had the elevators at the back of the wings, and it works as good as a normal back wing. Planes can also have a "canard", which is a back wing, but placed in the front, like a tupolev 144, the Russian clone of the Concorde. This also works like a normal back wing, but then the other way around.
@Adrian Stevanovic well, I am and have about 430 hours logged. About the Concorde, it has no horizontal stabilizer, but it has elevators next to the ailerons in the wing. I am pretty sure that is what I said. And there are planes that don't need a horizontal stabilizer, there are even planes with no tail and they can fly perfectly. About the TU-144, the stabilizers you were talking about are canards. Google it mate, it's not hard :)
@Adrian Stevanovic And oh yeah, you said that the Concorde had small elevators at the nose. Where did you learn that?
Excellent explanation
Very well explained
Friend: Wassup
Me: The sky...
I'm still confused by why the air on top of the wing is faster. It is going the same speed as the bottom air originally, but it now has more distance to cover. You would think that it would be going slower, not faster. I mean... I do remember from physics that horizontal acceleration doesn't change even if vertical speed changes (so a thrown ball going 15 mph south would still be going 15mph south as it drops, except for friction slowing it down). So is the idea that the air is still going sideways at a constant speed, but a new force is making it go vertical? Because if that's the case, then because it is covering that same distance, it's going to be moving quicker... if there's some other force that is also keeping it stuck to the wing instead of climbing the first hump and then flying off parallel to the bottom wing. I'm not sure if I'm making sense but I feel like I'm missing something.
Pressure, your missing pressure. You treat air like a stone. Sadly i cannot draw in a youtube comment.
Lesson 8 - Adventures with Bernoulli - Demonstrations in Physics
th-cam.com/video/HZClP-m9g24/w-d-xo.html
Your hairdryer experiment obviously works due to Bernoulli's law, but this setup has nothing to do with real plane wings. Whenever you aim high speed air on the top side of the wing, the air speed difference above and below the wing generates lift, however, this was generated by the position of the hairdryer and there are no asymmetrical winds out there. The haidryer should have been aimed and set at the center line of your wing (or more preferably, the wing moved like a kite) to judge whether it was the wing profile that made the airspeed difference. Even a single paper strip moves upwards if you blow high speed air above it.
No asymmetrical winds?
The shape of the wing accelerates airflow over the top surface relative to the bottom surface of the wing.
you are right it is pretty cool!
0:10 4 wings
2 big front ones
2 small tail ones
This man deserves an oscar. 10/10 video would watch again
Very cool. Nice demonstration!!
Awesome. Bringing this to my science class tomorrow... The wing, not the video.
Super explanation 👍
Hats off
Better than learning this at school
some late information because air is STATIONARY, there is NO flow, and no difference between the 'transit speeds/times' above and below a wing. as a result, ANY results from a wind tunnel-type apparatus are less-than completely accurate.
it's just a happy accident that bernoulli's math works reasonably well, for stationary fluid/air.
Davehax is now Davefacts
You just forgot the horizontal stablizer, the plane won't be able to control it's pitch and would be uncontrollable.
Well explained that
You're a great drawer, dave hax!
Actually this is wrong. You don’t generate lift because the air particles on top move faster than the ones on the bottom. That’s called the bernoulli's effect and it’s been disproven.
very good
Thanks needed this
Awesome
Cool science
The authors have two wrong scientific approaches: researching the creation of Lift force and Low pressure at upper side of the wing, relative to the ground surface and Earth. I explain the aerodynamic cavitation and existence of Lee side aerocavern, and creation of Aerodynamic force.
Uhm...
Where's the horizontal stabiliser
The stabalizers also has the rudder to control the planes direction.
Hey, Dave Could You please do an experiment showing the mechanics of Steam Locomotives?
You should start adding MLA format citations under your videos for easy citing.
the shape of a airplane wing (Airfoil) Wich is a curved shape at the top but is flat at the bottom. Due to bernulies principle- The faster air is moving the lower the pressure. the air will move faster on the top will make lower pressure. the lower pressure will pull the wind up and the slow moving air will make a lower pressure than the pressure on top. you can do a experament with bernulies principle- fold a paperr into a shape with 2 walls and a roof with a floor, do not use the paper for the floor use a table. it should look like a tunnel. Blow in the tunnel the low pressure air will suck the paper to the desk.
Statement 1 and Statement 2 do not logically lead to Statement 3.
I still don't get it you chave almost 5 million subscribers but get around 200k views (pre video right now) ????
Dave hax u have miss the back wings!
I’m just confused on the relation between velocity of the air and the pressure of the air. Why does higher velocity air create LESS air pressure?
the particles become farther apart. like how if air is heated up the particles do the same thing, speed up and spread out
My ksp blueprint
At time 2:45 to 2:49 it is told that the "air flowing over the top of the wing flows at a higher speed is resulting in a lower pressure". Is is also a fallacy like the "equal time fallacy". It is the wrong placing of cause and effect. The EFFECT is the higher speed of the air the CAUSE is the lower pressure which accelerates the air when flowing into the low pressure area. If you believe the higher speed of the airflow causes the lower pressure, then you would have to state the cause for the higher speed. As we have seen the longer path is NOT the cause for the higher speed because the "equal time argument" is wrong.
Your string isnt straight 90 degress up and down that's why the straw is rubbing against the string.
best drawing ever..
Wow! Pretty cool stuff!