The Coanda Effect (version 2013)

Text from this movie:
"So, one would expect the air to flow out of the fan horizontally in all directions,
but due to the Coanda effect; the air bends down, to almost 90 degrees
The airflow is being pushed down by the air above, because the pressure of the air in between the flow and the curved surface, is reduced by the suction of the airflow.
Next, an other example of the Coanda effect, where I used smoke to make the flow visible.
Air is being accelerated down, and part of the upper surface is in touch with reduced air pressure. This action gives the object a force up, thrust, that can lift the object.
Henri Coanda realized this, and then designed a flying disc based on this effect, in 1932!"
More about this at www.laesieworks.com/ifo/index....
On my site, I placed a copy of "The Coanda story" (interview, 1956). Great info:
www.laesieworks.com/ifo/lib/He...

[@tpowell453]

There isn't one single person commenting on this effect who can truly say that this behavior is "obvious". It is not obvious. This is a damn good exhibition of how some things in physics are counter-intuitive. Thank you for posting this demonstration!

[@windowsxseven]

It really is obvious

[@paradiselost9946]

@@windowsxseven yep. and its even more obvious that it cant produce lift, either. any lift is simply reaction to accelerating air downwards. figured it out when i was 8 or so, newspaper on an AC duct. oh my! magic! took a few more years until i realised that the AC duct is BOLTED TO THE WALL. bolt it to the newspaper itself? it sits on the ground doing nothing. the atmosphere is pushing down on that layer of low pressure air as hard as ever... what is really cool? get a flat plate, poke a pinhole in the middle, attach compressed air. use it as an air gun, blow stuff around. yay. push it against a surface... air forms a thin, high speed layer, the low pressure high velocity "film" easily overpowering the impulse effects of the jet of air itself. and the surrounding atmosphere pushes on the back of the disc. lol, i found that one out refilling LPG bottles and poking my finger over the vent hole... oooh, it blows but theres suction! dont feel it with a simple nozzle, but add some AREA to it... something to squeeze the air BETWEEN... by itself, what is the coanda effect "squeezing" against? more atmosphere that just keeps pumping down. it doesnt work. but if you place something above it to work against, and anchor THAT... lol, a "hovercraft monorail" that can suck itself to an elevated overhead roadway simply by blowing air AT IT... the OP here wouldnt understand from the sounds of it! ha ha, my best experience of "the coanda effect" i lost half my beard! brazing carbide tools, the pilot flame was playing up, using a lighter. put it on the bench... play oxytorch over work... with curved surfaces... flame wrapped around a full 270 degrees and blew the lighter up in my face...

[@gigicaly]

Henri Coanda was Romanian and after discovering this here called "Coanda effect" he designed a flying vehicle that was based on it. It looked just like a flying saucer. The schematics were stolen by German security and so the Germans came to build their disc shaped aircraft that the Americans confiscated after ww2. At the Romanian aeronautics museum there's a scale model of a disc shaped aircraft originally made by Coanda. Note that he never actually build a flying saucer. He was still designing them and building models when the plans were confiscated(as far as we know). And yes he also had the idea to increase the number of blades on a propeller and put that into a tube and from there he came up with the worlds first jet engine. Problem that he had encountered that he put that engine in front of the plane to replace the conventional propeller. That made the overheated exhaust gases to burn the plane not just in front but all way alongside it, and so discovering the "Coanda effect". He then tried to somehow invert it to push the gases away from the fuselage by adding winglike structures right behind the exhausts to direct the overheated gases away. .

[@marka9261]

please share some links to that flying saucer image !

[@getaclassphys]

Our new video about the physics behind this effect (sorry, in Russian:) kzbin.info/www/bejne/qpaYq5yQmNOIldk

[@OktoPutsch]

Can't beat toilet paper science.

[@abggk2]

+Okto Putsch hahaha your comment made me shit myself

[@OktoPutsch]

Evilshadowstorm Thank you, i also laughed my arse off, watching this !

[@BaaconHaawk]

+Okto Putsch One day at my junior high we went on a field trip they had done a sci. experiment and some people got that paper but he said it was really toilet paper xD

[@FPVFlier]

+BaaconHaawk when you drone I can only assume you a re referring to a multirotor..that be the case these two in no way relate, as a multirotor uses the same propulsion system as a helicopter (spinning rotors).

[@bosatsu76]

Except he's holding it the wrong way... The patent clearly shows the tissue comes over the top...

[@thecarloschannel2013]

thank you for making these amazing lessons and videos!

[@independentviews9245]

Excellent demo!

[@micultimy91]

I'm romanian and I'm proud! Coanda was one of the greatest minds of Romania!

[@nachoijp]

Toilet paper science is the best science XD

[@waynetemplar2183]

nachoij I used strips of toilet paper to map out the flow paths inside my PC case when I installed a beast of a new CPU cooler

[@danz409]

love the sound of something reving up to high RPMs!

[@TheGodParticles]

Thank you so much for explaining this! I truly enjoy your experiments

[@johnlegere478]

Fantastic illustration

[@boredthump2]

Gotta admit, I hadn't prepared my eyeballs with enough water to remain peeled the entire "second example"! I also had to pry my hand from the armrest after lol! Awesome!

[@Eniklis]

Cool nice demo !

[@VTOLKits]

Great demo...!

[@whan6677]

Henri Coanda a Romanian Inventor .Thank you for this video , and good luck in your new projects .

[@GiesbertNijhuis]

Thank you! And I enjoy doing the experiments & sharing the results.

[@airghandy]

the toilet paper demo is priceless (-:

[@GiesbertNijhuis]

Good observation! The fan is NOT sucking air from below though. It is air swirling under the craft, swirling in a vortex ring shape actually, powered by the down going flow on the outside. Similar to how water can flow upstream at some locations near the sides of a river, or behind a rock in the river. Some fish make use of this to preserve energy (the trout is famous for doing that).

[@thomascrowe3407]

Great report, Engineer First Class!

[@Xenro66]

This is REALLY cool. Have 2 of them spinning in opposite directions to cancel out the torque, there you go: you got thrust without spinning like a madman :D

[@jays907]

Amazing video, thank you.

[@joeestes8114]

Amazing!, briggs n straton has been useing it every since.

[@ClearseMedia]

This sounds like a title for an epic action film.

[@chucktilbury]

Low pressure produced by turbulence causes the change in direction. He also puts little rings around it to increase the turbulence, suggesting that he knows exactly how it "works".Turbulence is also why this does not produce much downward thrust.

[@ms.digitalpiggy9274]

How have I never heard of this? Granted, I'm no physicist but this is kinda mind blowing. And it was demonstrated in 1932? I know what my evening KZbin and Google search is going to look like.

[@GianfrancoFronzi]

This nautilus design is common in pumps and compressors , it flings the fluid out of each opening with the center as the intake . The effect though in open air is interesting .

[@tlatoanimachi]

Amazing just amazing.

[@CristiVlacicu]

You know... I actually watched this video only because I knew that Henri Coanda was a Romanian :) But I had no idea about the flying disc design. Cool stuff!

[@ariesk5n]

Thumbs up for Henri Coanda...the romanian who made this possible.

[@Babom_Official]

I'm proud to be romanian :')

[@rimfire806]

Technically he did not make this possible, this has and always will be possible it is one of the laws of physics. What he did is discovered why this happend, and what caused it to happen.

[@bursucu2912]

he also made the first jet engine powered plane in 1910

[@martyrmessiah3903]

@@bursucu2912 Planes and flying saucers were already in existence long,long before. He just discovered it. Dis -covered (as in 'uncovered') what was covered.

[@donpablo8434]

@@martyrmessiah3903 call it whatever you want but thank him when you board the next plane 😂✈️

[@mattsimpson2367]

Can you please test a full sphere, and cone shapes too?

[@morlanius]

Do you have any numbers for the relationship between rotation and air pressure?

[@GiesbertNijhuis]

The Coand effect and the vortex, are two of the many things I didn't learn at school.. !

[@GiesbertNijhuis]

This one; up to 1.2 kg force that could lift. If you want more thrust for your energy; use a larger fan, a much larger fan.

[@pulpo439]

Muy Buen Video. *¡¡¡ BUEN TRABAJO !!!*

[@willyjensen8595]

Nice demo of Bernoulli's principle.

[@TheTrumanZoo]

reverse the machine and blow into the disc shape allowing thrust in 360 degrees. or combine two and guide the streams.

[@GiesbertNijhuis]

Yes I have seen that. Interesting, and similar to my ideas. Thanks for the tip.

[@finddeniro]

Top Job Thanks ; Stay Warm and Good Music...

[@selectheowl]

An excellent and clear demonstration, thank you. However, I just can't help but imagine poor Mrs Nijhuis sitting on the toilet going "Oh ffs Giesbert, the toilet paper again??"

[@ehab3244]

great idea but to make it fly you should to support your version in bottom connected with the same motor and scale fan to bottom to quarter to make consented force for distributed to all body

[@markrigneymd6570]

What is the efficiency of the 90 degree thrust when using as a propulsive force, leaving out the efficiency of the fan and assuming an equivalent 80% efficiency of the average propeller? Thus if I an getting 80% efficiency with a standard propeller (which is really not thrust but an air SCREW, what is the efficiency of this effect when used as forward, or 90 degrees from rotational plane, thrust of the "disc" you are using?

[@phrenzy1]

Excellent demonstration and a great video. I was wondering whether you get a laminar airflow over the curved surface via the coanda effect?

[@markrigneymd6570]

I guess my simple question is what is the benefit of using this effect as thrust in relation to more standard forms of generating thrust. More efficient, control ability, compactness.....?

[@Bl4azedOG20TM-kadar_lrt]

Soo... we can use this if we could make a tower a big one, and build it in places where tornados are often a hazard?

[@brantbarker6264]

Pump protons into the core and add a superconducting electromagnetic field around it and certain light and sound frequency into the mix and wala.

[@GiesbertNijhuis]

Yes it is old stuff. That flying disc was designed by Henri Coanda in 1932. Not many people understand the Coand effect though. "not many" being an understatement. To work with ions... is on my to do list. Long list. Time flies. And I'm still on the ground -not flying yet.

[@osmick15]

High velocity air means low pressure. So yeah this makes sense. Atmospheric pressure is greater than pressure of the air coming out.

[@universalsailor]

Henri Coanda designed a plane in 1910 that some have claimed was the first jet aircraft. I seem to recall that that plane set itself on fire, (due to what is now known as the Coanda Effect) so it wasn't particularly successful.

[@29radux]

He was romanian!!:)

[@universalsailor]

radu gogoescu He was indeed Romanian. And so was George (Gogu) Constantinescu, another brilliant inventor. Among other things he invented a means of firing through the propeller blades of WW1 aircraft that was used by the British in their famous SE5a fighter. It relied on a whole new branch of engineering invented by Constantinescu, and called by him "the theory of sonics." A very fertile brain indeed!

[@29radux]

Tnx:)

[@ssaifulhaq]

This is why, the world feels so mysterious.

[@CariagaXIII]

i just love the engine sound

[@annihilus10]

How much lift does the contraption generate? Have you measured it, do you have any lift/rpm curves? Is that an airfoil-type blower?

[@stagdragon3978]

I wonder if we could use this for cooling systems...

[@johnholzhey8149]

It's really half of a venturi. The fast speeding air is lower pressure and adheres to the surface. It wouldn't make any difference what shape it is.

[@emputao]

Cute experiment to explain friction of air and a surface.

[@G777GUN]

Did you know there was an airship that used the same principle for thrust. Its really interesting.

[@SomeoneCommenting]

For all the flying saucer fans, you can levitate something if you just use a couple of these in the same way that drones use various propellers pointed vertically, not just one. It is too much trouble to try to control the huge unstability of a single centered flow, when you can have an easy-to control array of them.

[@GiesbertNijhuis]

I do many of my experiments with old stuff, saved from the trash. Most important is to keep high attention to safety, for these experiments can be dangerous.

[@igloo54]

"It's all fun and games until someone gets their eye poked out." --Famous quotes that all mothers say

[@RafaelFantastic]

Could this be used to pull a plane forward? I saw the part of the video that the commentator said that it could be used to pull up.. but.. what about forward?

[@SavageInsight]

Does the Coanda lifting effect have the same thrust/lift power as a helicopter blade of a similar size and speed with a similar power consumption?

[@GiesbertNijhuis]

It did service in a workplace, to remove unhealthy fumes and such. It had a cover around it, snail shell type. It is great for experiments, but way to heavy for flight.

[@kharu1975]

Henri Coanda was born in 1886, in Bucharest, Romania , yep he was a Romanian inventor :) .

[@tirpitz19]

So ?

[@GiesbertNijhuis]

Yes; it was a hot day, and the wind from the experiment made it cooler. :-)

[@bridgendesar]

What if you put a conventional propeller horizontally, would the same thing happen over a curve. Would there be any more lift then just pointing the propeller straight down?

[@mrreymundo5383]

Frankly I was hoping he was going to go ahead and let that t.p. get sucked in the intake and see how much of a mess it would make.

[@sandroelful]

looks very interesting

[@jaesong5490]

great work! I want to make one! Where did you get that fan? can you list your materials?

[@austemagne2023]

prodding around related videos they were all cooky then I come across this skeptical but brilliant video. Diamond in the rough ;)

[@wandahooks7094]

a

[@kreazyv8]

so the air is bend down, thus creating uplift trust,, but the force needed to bend the air issent that equal to the lift? and thus creating no lift? next would be the counterforce to get the engine/rotor to spin? the whole machine/contraption wil start spinning. feels like,, oke we got something here, but needs some tweaking to get it to work...+i wonder if it wil be energy efficient?? just food for thought i gues...

[@AntonioMartinez-pw9wz]

This would make a great fan. :)

[@apismellifera1000]

That was pretty cool I like that a lot!

[@SuperTechIT]

I don't know how I got here, but that was cool.

[@rexscuz]

So...if you took the outer cone that the air is flowing past...put it on bearings to allow it to spin and added blades inside and out of it to it to apply lift...that would be pretty powerful

[@Newbz2]

You are on the path to wonderful things, my friend. Been doing plenty of research of my own, but lack any funding. I also watched your curved vortex lift. I'd like to mention the possibility of the use of a non-tangible propeller/impeller though. I believe it possible to create a flying craft using a tesla coil wired in reverse to pull in free radiant energy. That could power a series of electromagnets to spin an impeller. This wouldn't work in space, but a nontangible torus equivalent would.

[@Allan_aka_RocKITEman]

I *think* the McDonnell Douglas NOTAR helicopters used this for anti-torque control versus having a tail rotor.

[@jimmartin7899]

Could you not design high speed trains with a nose like this to generate a semi vacuum like state to reduce friction has the train speeds down a track or tunnel?

[@GiesbertNijhuis]

Hi Mike. I'm not sure what you have in mind, nor what you want to achieve with what you proposed. Many things can be combined. Go and try, is my suggestion. (and make video of it!)

[@maxwelldynamics7495]

If the fan is reversed and its sucking in air, does the air going in still flow along the surface (upwards) or would it just come horizontally?

[@ryobie1]

If you flip the apparatus does the air get pushed up?

[@SL2K2000]

could you have a curved base too...with another fan just underneath the other...sort of suck the air back in from the bottom making a continous loop of air?.....not self sustaining, just a bit like a turbo

[@GOLEG11]

NOW! if you move this operational unit at a high speed of lets say 50mph, is it 99% aerodynamical? since it should push around the air-drag?

[@filmefranceze287]

For those who don´t know , Henri Coandă was a Romanian inventor and aerodynamics pioneer.

[@flamencoprof]

I remember reading about the Coanda effect in Scientific American back in the sixties. Don't remember it being presented as being related to aviation though.

[@royalcrestdrive]

big fan of your work, no pun intended :) this only works perpendicular to the horizon (because of atmospheric pressure)? wouldn't work if you rotated 90 degrees in any direction?

[@nunchuckerz]

would that create lift if turned upside down

[@GiesbertNijhuis]

It is possible to make the coanda effect so powerful, that it can lift a craft, making it; a VTOL aircraft. Flying forwards fast though, will disturb the coanda effect's airflow.

[@hgmg1599]

What is the difference or relation of this to the magnus effect?

[@truvak]

I had never heard about this effect, thank you for posting. Something inside of me always knew that flying saucers are possible, but I could not figure out how. Thanks.

[@dumicris7737]

when exiting the fan the air goes out horizontally for lets say 60 degrees k? the solid surface the air meets because of the friction it slows down the air circuling let's say at 2or3 degrees. the air above the slowed one goes in the low pressure place caused by the slowed air creating a vortex wich meets the solid at greater angle the new air beeing slowed down even more .. so more pressured air comes from above so it could be more eficient than that we are used to

[@TheTechnoJunkee]

dumicris But you don't know what the saucers are made of. Maybe the material of saucer helps the flow of the air.

[@truvak]

TheTechnoJunkee good one. Maybe the design of the material might help too, like the scales work for fish.

[@d4ni5h]

The atmospheric pressure will only be apparent whilst the object is stationary. Flying sadly would be out of the question.

[@truvak]

even if there are flying drones using this effect? they look real.

[@125varma]

Would you please kindly let me know what is the name of the impeller that you are using? I mean what should I be searching for if I wanna buy these types of impellers? Thanks in advance :)

[@shocka007]

put it from of a car / plane to reduce drag ?

[@annihilus10]

I plan to build a larger scale version of this using a lawn mower engine at 4000 rpm, and a 4 ft. diameter disc. Wouldn't an increase in lift result from somehow improving CIRCULATION about an airfoil-shaped disc?

[@homoerot03]

it is def. NOT the atmophere above it that pushes it down. if you flip this upside down, its still curving around the surface. look up "entrainment" (fluids) and put a solid object near the flow and you can start to see how it works.

[@m0nty90]

it's incredible you found out how helicopters work!

[@oboomabom]

How did you make the smoke? I've been looking for some way to make some with house hold materials but I couldn't.

[@carlosgroi1804]

Understood… I’m listening. Just want to point out… The finite stochastic fields based on particles trapped under pressure zones and the finite stochastic fields based on particles trapped by magnetic zones (which in both causes may cause multidimensional arrays within tensor probability considering asymmetrical forces) can interact differently when interlaced with ions and this may be nontrivial…

[@horizob]

Toilet paper aerodynamics right there!

[@brandonm4754]

Friggin Awesome!

[@ufoengines]

Has anybody applied this to a R/C quad copter design to reduce the hazard from the propellers?

[@mika2666]

in de year helemaal geweldig :P

[@bartoszbarejko1585]

Thank your for all your work. I am admiring your live attitude.soon i will ask you for cooperation if you do not mind ?

[@maysammirzakhalili4862]

Is it working in suction situation too ? In reverse ◀️ I mean? 🌹💖