Coanda Effect demonstration of working principle

[eovogt]

20 years ago this might of been impressive

[WildeTanteAnna]

Take a piece of paper between your two fingers and blow over it.

It comes up.

Aerodynamics First Lesson. This principe ist nearly the same.

[doceigen]

If you'd be so kind as to demonstrate the foil lifted 'level to earth' and then!... tell us the 1) surface area 2) weight of the foil 3) temperture of the air stream 4) air flow speed. Then, we could get a feel as to any efficiency gains over standard rotor propellor helicoper designs.

[HermieHedgehog]

"It's MegaMaid! She's gone from suck to blow!"

Is the air blowing or sucking from that machine?

[GRATZIANI2002]

is working..for 15 m/sec....ok..make the speed 50 m/sec..what's happening ?

[marcolovatto]

@GRATZIANI2002

Separation of boundary layer.

[smartfish9]

nice thank you

[IPlayWithFire135]

I'm confused...in school we were shown something similar with a strip of paper as a demonstration of the Bernoulli effect.

[smartfish9]

@IPlayWithFire135 Bernoulli is wrong

[recoveringcultmember]

@IPlayWithFire135 The Coanda effect has to do with a fluid flowing from a nozzle into another fluid. The fluid flowing from the nozzle will cling to a smooth, gently curving surface, if i'ts close to the nozzle.

Bernoulli doesn't depend on a nozzle.

Coanda has some patents. If you search google patents for 'coanda' you can find them, and they give an explaination of the principle.

[IPlayWithFire135]

@recoveringcultmember

Thank you.

[bryguy124]

Bernoulli effect

[buneaalexpetru]

@bryguy124 amd it is named coanda

[bryguy124]

@buneaalexpetru ya woops...that was meant for WernerFroneman

[buneaalexpetru]

@bryguy124 no problem...sorry

[broli123]

What would be awesome is to look at air flow with Schlieren photography.

[WernerFroneman]

A very easy, but very effective test of the Coanda effect is the teaspoon under the tap. Watch the video and try it at home.

The spoon gets "sucked" into the water flow - bernoulli has nothing to do with it in this case - purely Coanda- turning of a fluid, creating a force in the opposite direction.

Hope this gives some clarification.

[WernerFroneman]

It's not just the bernoulli effect.

Principally the bernoulli effect relates to the pressure difference, (due to increased speed above the wing,caused by the larger curved surface area) But remember, even a flat plate can create lift....WHY? That's where the Coanda comes in, It relates to the "turning of a fluid" - this is what creates the most lift.

YES, the bernoulli effect does play a role, but it's small in comparison to the Coanda lifting effect.

[WernerFroneman]

It's not just the bernoulli effect.

Principally the bernoulli effect relates to the pressure difference, (due to increased speed above the wing,caused by the larger curved surface area) But remember, even a flat plate can create lift....WHY? That's where the Coanda comes in, It relates to the "turning of a fluid" - this is what creates the most lift.

YES, the bernoulli effect does play a role, but it's small in comparison to the Coanda lifting effect.

[WernerFroneman]

It's not just the Bernoulli effect.

Principally the Bernoulli effect relates to the pressure difference, (due to increased speed above the wing,caused by the larger curved surface area) But remember, even a flat plate can create lift....WHY? That's where the Coanda comes in, It relates to the "turning of a fluid" - this is what creates the most lift.

YES, the Bernoulli effect does play a role, but it's small in comparison to the Coanda lifting effect.

[buneaalexpetru]

henry coanda (romanian)discover this

[smad333]

Yeah so that is the bernoulli effect... whats new

[dozerminer]

i would like to see some one make a hybreed between lifter /coanda uav.

[GenevaExperiment]

Henri Coanda

[ollieoniel]

wow it even overcomes the drag of the wind hitting the surface. thats really interesting.

[ronjersan]

Nice experiment you can develop this in the future.

[radiation500]

This is nothing more than a re-oriented Bernouli effect demonstration which airplane wings use all the time. As for the so-called coanda effect vehicles, a standard, run-of-the-mill military helicopter can outperform any of these tinker toy contraptions. Just take a look at what Cobra and Apache heli-gunships can do and you will immediately see how pathetic this coanda effect vehicle concept really is.

[Berkana]

I agree that helicopters can outperform these contraptions, but

the Coanda effect is not merely a re-oriented Bernoulli effect, and this demonstration shows it. When the flap is all the way up, even with 15m/s wind blowing on it, the pressure on the wing is exactly opposite what you would expect in a Bernoulli demo; the only reason it resists is because the air flow follows the curve, rather than peeling away. That is the Coanda effect. The Bernoulli effect is secondary or tertiary in this demo.

[Berkana]

Most of lift is due to the Coanda effect, not the Bernoulli effect. The bernoulli theory is backwards: it says air accelerates over the wing, causing a pressure difference that gives lift. (pressure = force/area) Acceleration never happens without a force; acceleration of air is an *effect*, a pressure difference is the *cause*. The pressure change is caused by the Coanda effect. The Bernoulli effect is secondary. Google this for details: David Anderson "Physical Description of Flight "

[DocWolph]

The Bernoulli principle is aptly applied to your argument but the lifting surface must have air flowing around it or it be in motion to create lift or thrust as in a wing or propeller. The Coanda effect, which I dispute is not what is shown here, works by directly putting the air above the lifting surface below the surface creating lift to create the pressure imbalance resulting in lift.

[DocWolph]

Helicopters, like propeller airplanes, get that locomotion the same way. The Blades, or Prop, use Bernoulli's principle to generate thrust. The Video above is more a demonstration of the Bernoulli Principle. The Coanda effect literally takes the air above the aircraft and puts it underneath creating the pressure imbalance resulting in lift. This is NOT what Helicopters do. They lift solely on the downward thrust of their props.

[Berkana]

Helicopters fly the the same principles as fixed wing aircraft, they just implement it a different way. Fixed wing aircraft move a wing through the air; rotorcraft move a wing through the air. The difference is that fixed wing craft move the craft to move the air, and helicopters move the wing (the rotor) directly. A thorough analysis of this can be found in "Understanding Flight" by David F. Anderson and Scott Eberhardt. Both wings and rotors create downwards thrust.

[stimsWonderland]

@Berkana It isn't necessarily downwards thrust although the blades of a helicopter or propeller create force in the opposite direction by a downwash or backwash but with wings I think there is a more of a sucking motion helping left . Newtonian physics is not entirely equatable with aerodynamics I think.

[Berkana]

@stimsWonderland:

Newtonian physics is entirely applicable with aerodynamics. Youtube's commenting area doesn't give me enough space to do justice to this topic, but if you're interested in reading a very thorough explanation of the things I've mentioned, check out the book "Understanding Flight" by David Anderson. There is no difference between wings and rotors except for rotation. One does not work by suction while the other by downwash.

[stimsWonderland]

@Berkana I wish to learn more than a few facts, thanks for mentioning book. Wish I can agree it is just that on a Boeing field trip a lecturer (to the disagreement of alot of students) told us that upwards force in theory has much to do with suction forces acting on the upper surface of a wing as it pushes through air while a propeller cuts through air but at an angle which drives air back like a rudder diverts air but a wing will work without ailerons.

[stimsWonderland]

@Berkana I think to illustrate you can take a wing and stick it onto a motor and rotate it and it won't generate the right kind of backwards force the propeller design can. If you replace the propeller blade for a wing it won't generate the sucking required for enough lift and also it is not aerodynamic in the sense for a lifting body. The helicopter blade is also variable pitch and its stall speeds are at supersonic speeds while stall speed of lifting body is lower due to laminar separation

[stimsWonderland]

@Berkana Coanda fx = best of both worlds. Toss lifting body rules out window/retaining aerodynamic lift. Flowing air sticks to surface but also gets redirected downwards. Suction and downward push of air happening. A heli blade can lift something much larger due to reusing downwash. Whole contraption minimizes danger to the blades, more aerodynamic (ufo) less noise and proximity of blades to upper surface due to some strange effect actually allows heli blades to grip more laminar airflow.

[stimsWonderland]

@Berkana Sorry for being long winded, I have many assumptions those are just some of my thoughts. I have a feeling coanda fx will be the wave of future flight.

[Berkana]

@stimsWonderland

I'm not saying that suction doesn't happen; suction is part of it due to a drop in pressure. Conventional theory (the Bernoulli theory of flight) claims that air accelerates over the curve of the wing, causing a drop in pressure, which sucks the air up. This is a plain violation of physics; spontaneous acceleration cannot happen. *All* acceleration is the result of a force (Newton's 1st.). Bernoulli puts a force as the result of acceleration, when it is the other way around.

[stimsWonderland]

@Berkana It seems like there is a fundamental difference between Bernoulli and Coanda theory but not beyond the sequence of steps the application is described due to semantics. They are both really doing the same thing at least from my eyes.

[Berkana]

@stimsWonderland

For the best explanation of this in an article, demonstrating what's wrong with the Bernoulli explanation, go to aviation-history dt com slash theory slash lift dot htm . If the calculation for what is needed for the Bernoulli effect to create enough suction to lift a wing is applied to a wing cross section of a Cesna, it would not look at all like what it does. A conventional wing cannot lift simply by the Bernoulli principle.

[Defhrone]

ok, I understand how this would be able to power a plane of hovercraft like device. But how would you apply it in the near vacuum of space? What would you spit of the top then, and would it use the same principle of just vaporize all over the place so to speak?

[Crazylalalalala]

you wont use it in space. Unless you want to carry tons and tons of compressed air with you. but considering you would have to take tons of rocket feul anyhow it might be worth while but i dont think the effect is as strong as a rocket.

[0ddba11s]

This is a nice demo video!

Coanda only works due to air pressure differences, you would need air both above and below the craft so no space flight for this baby see my video Nazi flying saucers 3.

[scarryharry011]

so this alien vacuum cleaner is also a flying saucer?

[liuton2005]

It's not a vacuum cleaner.

It doesn't pull in air but it spits it out.

[alexbuneapetru]

henry coanda was a romanian.....

[Deses]

Any problem with that? Romanians are pretty good people. They have strange traditions, though.

[alexbuneapetru]

not at all. i am romanian and im proud of that..

[Deses]

That's good.

I thought that you were one of those racist faggots who was "insinuating" that Coanda is a bad guy just for being Romanian.

No offence. :DD

[pravicpu]

Bernoulli effect

[TheHunter2008]

That's not exactly the bernoulli effect. The flying is because of the bernoulli effect, but the fact, that the air follows the sinous form of that part is caused on the coanda effect. If the air would just go straight on and not to follow the sinous form, the air had to be much faster to make that part to fly. AND THAT IS THE ADVANCE OF THE COANDA EFFECT, that it makes the moving air more efficient that the ordinary flying objects ^^

[pravicpu]

hmm thanks

[FloydsterUtube]

The dumbest thing posted here PaharCupai is your generalization of entire peoples based on your envy and or lack of education. By the way, Romania is not exactly the last bastion of intellect and ingenuity you MORON.

[Squidly78]

This could also be an example of Bernoulli's principle.

[JETZcorp]

How could it? Doesn't bernoulli's require airflow on the top and bottom of a surface?

[PaharCuPai]

i've seen some stupid comments on this video...amazing ...how can you be so stupid? are u americans? those of you...with the stupid comments..if you are americans ...that said it all ....

[rimshot74]

What an outstanding generalization.

[PaharCuPai]

:)) thanks !! It means a lot comming from you . :)) no offence ...just sarcasm

[Allexxx96]

its called coanda effect cuz its invented by henri coanda fom romania im from omania yeee

[sspoke]

corona beer?

[sspoke]

why is it called a coanda effect why not call it a AIR blower into a object makes it go up??

why make complicated terms for such basic ideas that everyone in their head already knows.

[nfsfanAndrew]

first time i saw coanada efect i thought it said canada efect. i was like wth! until reread it

[sspoke]

lol yah.. i watched it again and yup.. air gets trapped inside and creates like a mini paper airplane effect where the paper is trying to lift up but its grounded by some tape thats holding it down.. seriously nothing special!

[cowbot2]

idiot

[sspoke]

your the only idiot here if you can't understand something as basic as a air getting trapped from other air hitting on it and making trust and somewhat levitation of a object.. its soo simple to understand I guess you still have a primitive mind.

[BatsBensa]

hehe :)

[freddytuber]

It's blowing OVER a curved surface and not INTO something, you know-it-all fool! That generates an area of lower pressure and terefore the lift.

[cipndale]

Yeap you know it now but back then 1910 there were no so many to know it even if it is so simple as you say. Let see if you can build something using this simple principle. it is called that way because he actualy used it to build the first ever jet propulsion airplane.

[spiritass]

i believe that this effect was responsible for his jet engine charring his plane, because the aerofoils attracted the hot air stream coming from the engine. i might be wrong here though.

[mariusandra]

Blow to the left on right. Is very simple , is Coanda effect.

This effect has been utilized in many aeronautical inventions and is crucial to successful supersonic flight.

[vietarc]

NVM, correct myself, it's suppose to be blowing. I guess at higher wind speed will lessen the effect.

[vietarc]

It's sucking. Air lift power by blowing will cause the flap to elevate only to certain position. You can see in the clip that the flap go all the way to almost 90 degree. Blowing in that position would be momentum collision.

[rzeffe]

is this sucking air or blowing?

[TubeDupe]

Exactly ...

[VideyoJunkei]

its blowing! the suction would we too weak to lift it from the ground like that!!!

Blow across the top of a piece of paper, is will suck up, if you suck, nothing happens.

THere is a video here showing a spoon getting sucked into a stream of water...kind of the same effect

[meandalton]

If you ever get a chance to watch UFO's:The Real History It explains alot about Coanda

[meandalton]

Air blowing across it makes a low pressure system and its the pressure differential that lifting it

[Kenzofeis]

What bothers me is the alternating coanda effect around my buttocks when I fart, it makes me bellydance at a high frequency

[leviterande]

ahahahaaaohohh ooo

[ssm90]

i need to make me a flying saucer...this is not helping.

[thsmid]

Can you also demonstrate this for a homogeneous airstream (i.e. if the cross section of the fan covers the full width and height of the airfoil)?

Thomas

[GrandPrix55]

You can get the same effect by blowing over the top surface of a flat sheet of paper.

[sabriath]

I don't even know why the heck they call it a coanda effect when it is clearly the same principle airplane designs use as the curvature of the front face wing is rounded such that it makes low pressure above just like this is doing. I thought coanda effect was to use recirculating air across a surface to build lift without having to replenish the supply?

[MGoofy]

The Coanda Effect invloves blowing air over a surfave to create lift.

[arbigast]

it definitely sucks

[wii2good4u]

you should clarify which way you are blowing/sucking the air

[austinpowers1977]

its sucking

[suprememind]

its blowing

[jasonguyperson]

it's blowing. that's the point of getting the airspeed. (and just look at which way the damn thing is pointed)

but hey, sucking or blowing, it all sounds like fun anyways lol

[VideoJunkei]

It is blowing-he is using a leaf blower!

[suprememind]

its sucking

[GOTsomGAARA]

a leaf blower can suck you moron

[wii2good4u]

well now im just confused lol