The Coanda Effect (version 2013)
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- Опубліковано 13 сер 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... - Наука та технологія
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 At the Romanian aeronautics museum there's a scale model of a disc shaped aircraft originally made by Coanda.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. .
please share some links to that flying saucer image !
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!
It really is obvious
@@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...
Our new video about the physics behind this effect (sorry, in Russian:)
ua-cam.com/video/te5ziZcnU_w/v-deo.html
Excellent demo!
thank you for making these amazing lessons and videos!
Thank you so much for explaining this! I truly enjoy your experiments
Fantastic illustration
love the sound of something reving up to high RPMs!
I'm romanian and I'm proud! Coanda was one of the greatest minds of Romania!
Great demo...!
Thank you! And I enjoy doing the experiments & sharing the results.
Great report, Engineer First Class!
Henri Coanda a Romanian Inventor .Thank you for this video , and good luck in your new projects .
Amazing video, thank you.
Amazing!, briggs n straton has been useing it every since.
Cool nice demo !
Can't beat toilet paper science.
+Okto Putsch hahaha your comment made me shit myself
Evilshadowstorm Thank you, i also laughed my arse off, watching this !
+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
+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).
Except he's holding it the wrong way... The patent clearly shows the tissue comes over the top...
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!
Muy Buen Video.
*¡¡¡ BUEN TRABAJO !!!*
Top Job Thanks ; Stay Warm and Good Music...
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).
the toilet paper demo is priceless (-:
Yes I have seen that. Interesting, and similar to my ideas. Thanks for the tip.
Amazing just amazing.
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.
He was romanian!!:)
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!
Tnx:)
Friggin Awesome!
This would make a great fan. :)
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
i just love the engine sound
This sounds like a title for an epic action film.
That was pretty cool I like that a lot!
How much lift does the contraption generate? Have you measured it, do you have any lift/rpm curves? Is that an airfoil-type blower?
Toilet paper science is the best science XD
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
Do you have any numbers for the relationship between rotation and air pressure?
The Coand effect and the vortex, are two of the many things I didn't learn at school.. !
Nice demo of Bernoulli's principle.
Thumbs up for Henri Coanda...the romanian who made this possible.
I'm proud to be romanian :')
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.
he also made the first jet engine powered plane in 1910
@@bursucu2912 Planes and flying saucers were already in existence long,long before. He just discovered it. Dis -covered (as in 'uncovered') what was covered.
@@martyrmessiah3903 call it whatever you want but thank him when you board the next plane 😂✈️
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??"
Excellent demonstration and a great video. I was wondering whether you get a laminar airflow over the curved surface via the coanda effect?
Can you please test a full sphere, and cone shapes too?
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 .
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!
looks very interesting
Fascinating...
This is why, the world feels so mysterious.
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?
great work! I want to make one! Where did you get that fan? can you list your materials?
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 UA-cam and Google search is going to look like.
in de year
helemaal geweldig :P
The Coandă effect is the tendency of a fluid jet to be attracted to a nearby surface.[1] The principle was named after Romanian aerodynamics pioneer Henri Coandă, who was the first to recognize the practical application of the phenomenon in aircraft development. wikipedia :)
Pump protons into the core and add a superconducting electromagnetic field around it and certain light and sound frequency into the mix and wala.
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?
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.
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.
the coanda effect exceptionally espectacular
prodding around related videos they were all cooky then I come across this skeptical but brilliant video. Diamond in the rough ;)
a
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.
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?
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?
Hello Giesbert cool name. I had a few questions for you. Is there anyway to add multiple "wings" to this design? Or how about putting a vortex upside down on the bottem of this coanda effect? where the bottem vortex design overlaps the upper design to pull the air as it is pushed down?
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.
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 :)
Did you know there was an airship that used the same principle for thrust. Its really interesting.
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.
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.
Love it.. This is really cool :D Keep posting the good work.
great!
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.
"It's all fun and games until someone gets their eye poked out." --Famous quotes that all mothers say
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?
Yes; it was a hot day, and the wind from the experiment made it cooler. :-)
Henri Coanda was born in 1886, in Bucharest, Romania , yep he was a Romanian inventor :) .
So ?
AMAZING, AWESOME, WONDERFULL,.......
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
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?
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.
How did you make the smoke? I've been looking for some way to make some with house hold materials but I couldn't.
If you have the time look up a video titled -Phi Vortex Mathematics Torus Array-
It is 12 of the most eye opening minutes I have ever experienced.
This video really dissects the torus, and gives an almost eerie insight into the patterns between the numbers associated with binary code, the Fibonacci sequence, music, and the flow of energy.
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?
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?
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.....?
What is the difference or relation of this to the magnus effect?
GREAT VIDEOS! Okay so I'm an Owner of a company who works as a contractor for wind energy. I've been working in the industry for 10 years. And I'm a propulsion nut as well.
I looked at your website. Had you ever considered using high voltage ionization to assist with lift, also I believe a well planned placement of vortex generators would improve your wind flow by 2-3%.
Seem like a great progress over the years. Let me know if you have anything that I can assist you with.
Best Regards
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.
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
dumicris But you don't know what the saucers are made of. Maybe the material of saucer helps the flow of the air.
TheTechnoJunkee good one. Maybe the design of the material might help too, like the scales work for fish.
The atmospheric pressure will only be apparent whilst the object is stationary. Flying sadly would be out of the question.
even if there are flying drones using this effect? they look real.
it's incredible you found out how helicopters work!
Is it working in suction situation too ? In reverse ◀️ I mean? 🌹💖
If you flip the apparatus does the air get pushed up?
Thank your for all your work. I am admiring your live attitude.soon i will ask you for cooperation if you do not mind ?
Cute experiment to explain friction of air and a surface.
Well then, never knew this before. Has is been proven to lift objects? The flying disc, is there a working model of it anywhere?
Can this method add more thrust?
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...
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.
I think this would translate quite well in aiding air-cooled engines to direct air flow down through the heads and cylinders. My thoughts turn to the Chevy Corvair and the engine shrouding GM designed to direct air flow down pass the finned heads and cylinders and out a thermostatically controlled vent door at the rear lower bottom of the engine. My '65 Monza is going to become a science project.
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.
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?
I wonder if we could use this for cooling systems...
1:51 that look real SciFiction. The impulse can be utilized or its usless compared with helicopter ?
I don't know how I got here, but that was cool.
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.
Another consequence of this demonstration, is some poor person sat on the toilet realising the toilet roll isn't there