This channel basically shows the trade-off between practicality and ingenuity In this case: The trade-off between a good and a fun lawnmower

@Erdroy1

4 жыл бұрын

Hovercraft lawnmower? Seems fine to me. Extremely safe. I NEED THIS lul

@LordDragox412

4 жыл бұрын

He did not make a good hovercraft, but he did craft a hoover/vacuum cleaner for leaves :D

@acered1651

4 жыл бұрын

flashback to honey i shrunk the kids RC lawnmower scene

@xdragon2k

4 жыл бұрын

Next Video: Lawnmowing Hovercraft.

@jchan3358

4 жыл бұрын

@@Erdroy1 A lawn mower that lifts off the ground...what can possibly go wrong?

"Here's how to make a very inefficient but physically interesting hovercraft!"

@BienestarMutuo

4 жыл бұрын

For second time, this man could be the king of inefficiency.

@MrAlipatik

4 жыл бұрын

lmao

@squeakybunny2776

4 жыл бұрын

@Elijah the only cars that get *pulled* forward are broken cars... Cars *push* themselves forward

@squeakybunny2776

4 жыл бұрын

@Elijah so your second comment already was quite toxic and now you also show how stubborn you are and can't take it that you were wrong... Your personality sucks hard mate

@hadoukan722

4 жыл бұрын

Sometimes science is testing a hypothesis

I feel a huge advantage over conventional hovercrafts is that you've succeeded in freeing up the airspace inside the fucilage which can now be used for people or packages etc.....Also, as wonderfully demonstrated as your presentation is I feel it would be a great addition to have a smoke or some such in slow mo to truly impress upon the viewer the Coanda effect....great stuff all around, pleasure to watch...

This is the most times I’ve ever heard the words ‘coanda effect’ in one day, crushing the previous record of 0. Love your projects!

Welcome back to today's episode of: "Unconvential Lift"

@boden8138

4 жыл бұрын

Efficiency is overrated

@soundslave

4 жыл бұрын

Next time we look at boob-tape

@angrymario8259

4 жыл бұрын

@@boden8138 my German heart can't allow this

@emadharoon1656

4 жыл бұрын

JOEL You’re here too 😂❤️

@logmeindangit

4 жыл бұрын

Did you mean "Unconventional"?

So nobody’s going to mention how amazing his lawn is

@Skullwalker

4 жыл бұрын

Probably had to keep it down for it to work😁😎

@Skullwalker

4 жыл бұрын

Definitely noticed the stripes though 😁🍻

@memesfromdeepspace1075

4 жыл бұрын

@@Skullwalker i thought ITS my screen broken but nope ITS just the grass color

@mackdlite5900

4 жыл бұрын

Fit for the Queen's corgis!

@OMEGATEAM473

4 жыл бұрын

He c&c s it.

I dont know if anyone else mentioned it but this had one of the best sponsored segment formats.. I didnt feel the need to skip cause I could watch him work on the hovercraft.. Nice

Considering how many leaves I have to rake every year, that little side effect makes this hovercraft very appealing!

@dimitar4y

3 жыл бұрын

have fun while you clean :D

In other words, what you've built is a Coanda effect leaf gatherer.

@awhahoo

3 жыл бұрын

No longer have to rake

@troychildress5540

3 жыл бұрын

I can have fun driving my rc but doing a chore Humm I shul make this

@kiwibob223

3 жыл бұрын

You need mount a gun so you can bullseye any womp-rats you spot

@Caramelhorse1

3 жыл бұрын

If he markets these as garden roombas he'll be a millionaire in no time!

"Ive covered all the electronics in packing tape, so they should be waterproof" Famous last words

@DannySullivanMusic

2 жыл бұрын

rofl awesome comment

Cover the underneath so it doesnt collect detritus, give it wings with aelerons at the back and put the forward thrust props at the front. This could really take off.

@jamesshriver4822

2 жыл бұрын

Absolutely correct!

@ronjoe6292

Жыл бұрын

It doesn't matter which side the thrust props go, it's completely equivalent. It's like the pendulum rocket fallacy.

@tapuout101

Жыл бұрын

Maybe covering the bottom will make it more efficient?

@whaaaaaaap

Жыл бұрын

I need to see it

@TlalocTemporal

4 ай бұрын

​@@ronjoe6292-- Since the thrust props aren't aligned to the center of mass, they will apply a different moment. Rear mounted is probably better here though, better pitching up than pitching down.

This is absolutely fantastic. Sometimes, it is less interesting to know if a thing will work _well,_ than it is to dicover whether or not it will work _at all._ Edit: Never mind, I'm eating my words now; it's a hovercraft that can do jumps. That's the coolest thing I've seen at least all week.

This was really interesting - it would be good to see it in action with some small smoke sources attached, to trace the airflow

@tyronekim3506

4 жыл бұрын

I agree. This model demonstration showed that it's better to use unobstructed flow thrust for lifting than to use flow effect due to Coanda.

@sebastiangeorger5791

4 жыл бұрын

Hey I love your videos Atomic Shrimp

@Mr_Lesbian

3 жыл бұрын

wow this channel really attracts KZreadrs I watch huh? Also yeah that would be super cool.

@nocturn9x

2 жыл бұрын

What a weird crossover indeed

@DannySullivanMusic

2 жыл бұрын

i agree! precisely right!

13:47 was the money shot for me: That slo-mo jump over the gravel path had my inner eight year old imagining Luke Skywalker skipping over dry river beds on Tattooine.

@SecularGeek

4 жыл бұрын

I was seeing landspeeders too!

@joonasfi

4 жыл бұрын

Yeah, that was totally badass!

@thejokestersquad3686

4 жыл бұрын

@_ David _ are you refering to your comment there?

@thejokestersquad3686

4 жыл бұрын

Ah, a child I see, well then, there's no point for my further precense here

Appreciate how you include your failures and document the incremental progress that leads to success

The out takes are a good show of the the ruggedness of your project and building skills. The advantage to your design is shown a bit when it travels over a drop off and maintains lift instead of losing all the air out of the traditional envelope. Looks like a fun project. Keep up the good work!

Its as a yard vacuum that even the kids will love. Comes with free pair of shin guards!

When you made a roomba to collect all the leaves for the autumn season.

@uggranpops8442

3 жыл бұрын

*outdoor roomba

@uggranpops8442

3 жыл бұрын

@Wyatt Watling a roomba I'd buy

File this one under “just because you can doesn’t mean you should”.. I do love the creativity he brings to his projects.

1 thing I've seen repeatedly, in your comments, is how impressive you are making inefficient systems more efficient, or how dedicated you are. I think it's rather important to have someone like you. It's entertaining for us, certainly fun for you, and wonderful to watch someone testing different hypothesis. Keep up the good work

Perfect ad segway. I dont mind listening about the sponsor (that is honestly all over YT already) while watching you work

@edwardatnardellaca

4 жыл бұрын

I was also incredibly impressed with the sponsorship segment, possibly the most palatable one ever seen!

@TIICProductions

4 жыл бұрын

This is the first ad I haven't skipped over in ages! @audible should take note!

@malfattio2894

4 жыл бұрын

It also helped having something interesting to look at but not too important in the ackground

@richbuilds_com

4 жыл бұрын

Definitely how to do ads without turning off your audience.

@Keex11

4 жыл бұрын

@@richbuilds_com *some of your audience. I don't like it.

The efficiency of this setup puts tears to my eyes, but it's a very interesting experiment nonetheless. I'm glad to see you use foam as well, it can't be praised enough for small scale lightweight construction. Please keep doing ground effect vehicles! I would really love to see you attempt a wing-in-ground craft in the spirit of the Orlyonok: a long fuselage with stubby wings, a high T tail with the main propeller blowing onto the control surfaces, and a pair of front-mounted jets blowing air under the wings for takeoff. You definitely have the skills needed to address the vertical stability issue, using some kind of distance sensor and a PID + filters to keep altitude within the tight stability envelope.

@rizalardiansyah4486

4 жыл бұрын

Or perhaps a simple trim control for the lift motors for a start?

@atomicsmith

4 жыл бұрын

Totally agree about WIG. I find that subject very interesting. Also probably significantly more efficient than this arrangement...

@bipolatelly9806

4 жыл бұрын

I praised some foam and it turned red. Never again.... (unless I need red foam.) It shat me to tears.

@KuraIthys

4 жыл бұрын

The problem with the ground effect for these kinds of small-scale experiments is that the practical 'hover' height varies in relation to the vehicle's scale. This is why even a 100 metre long hovercraft is using a rubber skirt to increase the ground clearance. Aside from serious stability problems with the ekranoplan concept, there's also just the sheer issue of scale; Normally, vehicle technologies are developed at a small scale and then gradually made bigger. But the underlying physics of a Ground Effect Vehicle is such that small vehicles are VASTLY less practical than larger ones. A 600 metre long cruise ship size GEV would function so much better than even a 100 metre long version that it's almost incomparable... Yet it's self-evidently impractical to jump straight to building a 600 metre long vehicle as a test. And when you get down to the scale of even a car, you're already dealing with effective 'hover' heights (if you aren't using the rubber skirt thing to artificially increase it) of a few cm... Something the size of a typical small scale model hovers at such a low ground clearance that even a moderately uneven indoor flooring surface would be difficult to deal with...

@_tyrannus

4 жыл бұрын

@@KuraIthys I know about these constraints. If you ask me I'd love to see big ekranoplans being developed as a replacement to airliners and/or cargo ships! The scale at which you can make them would likely make them good candidates for nuclear thermal propulsion, as you would have plenty mass and space for a submarine-type reactor + shielding. Yeah you could also make cruise ships, but those should really disappear at some point if we're serious about pollution. As for the small scale, there are smaller ground effect vehicles being sold that aren't bigger than a small boat, and they definitely only stay aloft through pilot input. You also only need a boat licence to operate them but that's another story. Put a microcontroller on the job with Tom's code, and I think (at least I hope) stability shouldn't be too much of an issue as long as the model's actuators react fast enough, even at an even smaller scale.

Our new video about the physics behind this effect (sorry, in Russian:) kzread.info/dash/bejne/pplp3MuTk9G7j9o.html

I would love to see a collab with Mark Rober on some of these projects.

@howardbaxter2514

3 жыл бұрын

Imagine if Tom, Mark, and Stuff Made Here all collaborated on a project together.

@bricology

3 жыл бұрын

@@howardbaxter2514 -- you'd better invite Colin Furze too, or he'll build, and attack them with, a giant flamethrowing hover-saw.

@TheHorseOutside

3 жыл бұрын

Mark Rober donated to a eugenics group

@thespud1094

2 жыл бұрын

just don't invite Michael

@KingOfTheKindle

2 жыл бұрын

Add stuff made here to the list

You should water proof the electronics, put some foam in the sides for flotation then try to take it to a lake

Wow, i do find this very interesting idea, but there's two things i want to point out : First, perhaps you should have kept using impeller instead of propeller as it seems the propeller created too much lift that the coánda effect plays an insignificant role in lifting the hover craft. Second, to prove whether there is coánda effect in the first place, you can use the fog generator like from last upload. I hope this could help the development. Thanks for sharing this project to us Tom, can't wait to see your next upload.

@EdwinSteiner

4 жыл бұрын

Indeed. A comparison to a similar build with the foam body replaced by a flat sheet of the same footprint and weight would also be interesting to see how much the effect contributes.

@EdwinSteiner

4 жыл бұрын

P.S.: Note, however, that the downward momentum imparted on the air by the propeller is transferred back to the hovercraft when the air is redirected to the horizontal flow, so at least that should not contribute to an overall lifting force.

@1Hippo

4 жыл бұрын

@@EdwinSteiner Correct, but not the complete momentum is transferred back, otherwise there would be zero left (no horizontal flow at all). You would need air speed measurements before and after the redirection, i assume the difference is only a small fraction.

@soeveth

4 жыл бұрын

@@EdwinSteiner I believe there was an episode of Mythbusters that used a fan to blow air against a sail and it did provide enough thrust to move the boat forward slowly. While not exactly the same, i believe its the same principle.

@soeveth

4 жыл бұрын

@Desmond Bagley yes I do mean that, it didnt make sence to them as well as all force should come out equal. But they were able to move the boat slowly against the wind if I recall, But it was very slow like 1 or 2 km/h. kzread.info/dash/bejne/p3-Mr7azfbS9mtI.html

It's really interesting, but I think that the coanda effect isn't enough to lift the hovercraft. You have used standard propellants that creates a low pressure area above theme and this is probably what have lifted the hovercraft. This is the same principle that make helicopter fly.

@andrewsparkinson1566

4 жыл бұрын

That makes sense Erik, i think your on to it.

@XXX3RX0

4 жыл бұрын

Okay, so, I was about to write a long essay on why this was wrong, but I caught myself misunderstanding what you wrote. I think what you're talking about is Bernoulli's Principle which also applies to other crafts, such as airplanes. While this is technically true for the propeller wings and commonly accepted in aerodynamics, it does not tell the whole story. While the Coanda effect isn't an efficient way to create lift, it does, in fact, direct the flow of air downward which (using newton's third law of motion) dictates that an opposite force would lift the craft upwards. Now, why I disagree with Bernoulli's principle being the biggest contributor to the lift in this instance is because if the shape of the body had been more flat, the downwards airflow would be solely pushing down on the body, causing an equilibrium of forces. Although, I'm not claiming that I'm more correct than you. Aerodynamics is still a hotly discussed topic. It works. We just don't know exactly how it works yet.

@ionutalex7347

4 жыл бұрын

i would like some numbers.... i don't see any numbers anywhere

@ColinDH12345

3 жыл бұрын

@@XXX3RX0 Its a misconception that Bernoulli's principle is the biggest contributor to wing (rotor) lift. Its a myth that gets replayed all the time. If it were then flat wing balsa planes wouldn't fly. Also, many aircraft can fly upside down and that's not explain by Coanda or Bernoulli's principle. Its the angle of attack reaction that is the main lift generator in aircraft. Just to clarify a point.

@catroarb

3 жыл бұрын

Exactly, the vertical helicopter positioned propellers create lift either bcs even if the base is big, they might still be pushing enough air down to create lift or as someone said, bcs of the blade's shape (if those are wing like)... The way to find how much trust those are adding would be having a spring or some kind of sensor that tells how much those propellers pull from the body and subtract the entropy created by the blades pushing air gainst the body which just goes to vibration etc.. My prwdiction judging by the low motion vid showing how the hubber flies straight out of Ramos is that the C effect is almost neglectible, other wise the body would immediate ly fall after leaving ramo, since the C effect would have no ground to push on

I can't get over how amazing this channel is. So interesting in each topic every time.

It's difficult to see how much is the coanda effect and how much is the fact that you're using lift propellers in the first place. You could figure this out by mounting the lift and thrust motors on a flat plate with the same plan area as the coanda hull and see how much lift you get.

@dklouwens7559

4 жыл бұрын

The probs actually create downwards thrust. So the coanda effect is clearly visible

@tananam9782

4 жыл бұрын

@@dklouwens7559 How is this "clear?" Please be more precise.

@tananam9782

4 жыл бұрын

@@BondiAV Perhaps a better understanding of the coanda effect may be seen in directional effect, rather than lift. That is, can we use coanda to direct a vessel diverting downward thrust into horizontal thrust? Hmm... How may we be able to differentiate the effect of coanda from the simple Newtonian redirection of thrust? I'm no aeronautical engineer. It's hard to imagine that someone hasn't already thought of all this. Interesting to ponder, nonetheless.

@benjaminhackett8896

4 жыл бұрын

@@dklouwens7559 Uuh, if the propellers were producing downwards thrust, the propellers would have to be pushing air upwards and away from the hovercraft.

@acblaze3116

4 жыл бұрын

Exactly! I was just about to comment the same thing

Could be a fun take on a backyard Roomba It's clear that the Coanda effect is functioning to create a pressure differential great enough to suck up leaves, but I wonder how much of the lift is Coanda, and how much is those massive props just pulling the whole thing straight upward

@toxaq

4 жыл бұрын

Novur needs to make a square sided version to compare.

@MrKakaofreak

4 жыл бұрын

@@toxaq exactly what I thought, would be interesting

@wesmatchett615

4 жыл бұрын

I don't think that will work at all. The downward trust of the props is hitting the craft body, cancelling out any lift. For the same reason, you can’t put a fan on a sailboat to generate thrust.

@bdhost07

4 жыл бұрын

I bet most of the lift is coming from the props. The fan/sailboat comparison doesn't really apply here.

@AKULA689

4 жыл бұрын

I saw that as well, I thought the design would create a stronger vacuum and pull it down. Maybe a small vent hole just under props to either vent any suction or possibly push some thrust down into the space!

_"In 2020 there will be hovercrafts..."_ 2020: *Hovercrafts*

@fredlonbottom238

3 жыл бұрын

Me watching Tom play with a Hovercraft in his room with fast-spinning propellers with no safety walls or features on: rapidly bites fingernails off

@RaulTecar

3 жыл бұрын

2020: Lovecraft

People like you move the world. Beautiful work. Congratulations.

It's really cool how you took a physics effect and applied it in such a creative way on a real project . As always was a pleasure learning with you Tom :D

I can't imagine the coanda effect having a noticeable difference to be honest. Mount the props vertically and see if there is any downward thrust due to the coanda effect.

@strangelee4400

4 жыл бұрын

@@mcgherkinstudios That was what i was thinking. In the configuration as it is now it's just a fat inefficient helicopter.

@nialltracey2599

4 жыл бұрын

@@mcgherkinstudios The point of the coanda effect isn't about pressurising the air below, it's about generating lift along the curved surface. Tom took the additional step of trying to pressurise by extending the curve. However, this means he now has a downward facing curve, so if the airflow is extending that far, he's actually generating negative lift that's partially counteracting the upwards lift he was shouting for with the upwards-facing part of the curve.

@janpul1590

4 жыл бұрын

@@strangelee4400 yeah, thought that too

@SeraphX2

4 жыл бұрын

@mcgherkinstudios I'm no physicist so I'm just pulling shit out of my ass, but the props are smaller than the surface area of the vehicle. This means the force it generates is pushed directly against the surface that it's trying to lift (until the low pressure is sufficient enough to cause the Coanda Effect to take over). kzread.info/dash/bejne/gGR9qdSMmsaoitY.html According to this video, when a vehicle (small drone) generates it's downward lift force, the weight on the scale does not change because the downward force from the drone is enough to make up for its own weight that was present when resting on the bottom of the container it is in. So, instead of going to -21 grams, it stays at 0 because the force necessary to lift it is being pressed against the container. Is this not something like what would be happening here, but since the two items are connected, it's creating it's own negating force? I'm more interested in how to prove what is causing the lift effect. Are the props overcoming the weight or is the air from the props creating a low pressure around the surface of the vehicle, causing lift? I am also curious (not knowing anything about this stuff) would the altitude of the vehicle change if the props were creating the lift directly instead of the Coanda Effect? I mean, if the props are generating the lift, sudden altitude change shouldn't really matter, should it? A helicopter doesn’t suddenly plunge toward the ground after passing over a mountain. When the vehicle jumped the gravel walkway or left the elevated, bricked area, it immediately dropped. Does this indicate that the Coanda Effect is in place (since proximity to the ground is, I'm assuming, important for this effect based on the type of vehicle) or that changes in air density matter with such small props even at a few inches?

@manuel290597

4 жыл бұрын

@@SeraphX2 Nice

Fascinating from theory to proof, well done!

Most convincing audible ad I've ever seen!

"I'm surprised it's working so well on grass" *immidiately flips over*

@Supreme_Lobster

4 жыл бұрын

What fun is it if it can"t do a flip?

@Nilguiri

4 жыл бұрын

Your hat is on backwards! You must feel like such a fool!

@bloodyxwolf2541

4 жыл бұрын

@@Nilguiri chill, it was a joke

@Nilguiri

4 жыл бұрын

​@@bloodyxwolf2541 Jonesy Films put his hat on backwards for a joke? OK, if you say so, mate. haha.

@woolfoma

4 жыл бұрын

Well he did say he was surprised.

It's an interesting idea. Sadly, I think much of the lift being generated when the craft is stationary is coming from the very powerful propellers you're using and not the coanda effect. However, you are getting a very strong coanda effect when the hover craft moves forward. It doesn't really have any more practically than arbitrarily limiting a wing to flying only a few feet off the ground.

@Poldovico

Жыл бұрын

I guess the question there is: did you build a Coanda effect hovercraft, or did you build a very low power helicopter.

I really like how you do the time lapse during the "commercial" period of your video while you talk about Audible. I usually skip forward at this point in the videos but your time lapse kept me engaged! Well done!

Love it. You can probably improve the balance and reduce its tendency to tip over by suspending the batteries and other weight lower inside the shell to reduce its cg. A wire mesh may be necessary to prevent leaf inclusion, although that will certainly reduce efficiency and might cause clogging.

Yes!! One of my favorite effects! Up there with Dunning-Kruger and laminar flow!! Thanks for sharing 🤘🤘🤘

The slow mo bit at the end - coolest thing I've seen on this channel.

The way it glides is really satisfying

Great project exploring observable phenomenon, Tom. Really appreciate your efforts and curiosity. Kind Regards.

Man, i have a project for you: An EKRANOPLAN (ground effect aircraft, originally a USSR project) !!!

@GruntW0rk

4 жыл бұрын

If you don't understand how the EKRANOPLAN and ground effect works all you imagine is it going nose in and being more or less EXPLODED when traveling 300+ mph on water. Jet boats for example. Shit goes wrong and it becomes confetti. Using ground effect means if it loses speed it falls back into the water very controller. Like when a Helicopter auto-rotates. Tl;Dr I agree.

@fuckYTIDontWantToUseMyRealName

4 жыл бұрын

Early research was actually American: en.m.wikipedia.org/wiki/Ground-effect_vehicle#History

How to make inefficient and uncontrollable stuff 2.0. Awesome guy 😃

I'm new to this but I'm doing an engineering course and am researching this. Thankyou for your help

The slow mo is super satisfying to watch

Those slow motion bits were awsome ♥️♥️♥️♥️♥️

Nice slow mo, and the ad format worked really well. Great video Tom!

really like your effort and thank you for sharing it.

“These aren’t the droids we’re looking for. Move along.”

I am not sure it is the Coanda effect, it could be the propellers. My main thought about your instability is that it is similar to a fly wing.

@pesqair

4 жыл бұрын

he needs to make a box shaped one and test

@dr_jaymz

4 жыл бұрын

I think there is some effect, but mainly low pressure above the propellers. But then again, the propellers are using the coander effect too. The leafy wind tunnel showed there is little blowing downward and I think it was too optimistic for it to blow round 180 degrees! I think 35 degrees is pushing it.

@triplem9805

4 жыл бұрын

Would some cotton telltales around the hull (or a smoke generator) either prove or disprove it?

@1Hippo

4 жыл бұрын

Yes, i also think it is from the propellers. They are moving the air downward first, so there must be an equal force in the opposite direction (up). This will act on the propeller shaft and after all pulls the vehicle up. It does not really matter where the air goes after that, as long as it is not redirected up again so it would create a force directly pushing down, but i don't see any way how that shape would do that. A relatively simple test could be to change the propeller angle, so they push air just horizontal over the craft, which should also get redirected down, if the coanda effect works. You could even use the rear motors spinning in the opposite direction, then counter the backward force with a second propeller (pair).

@hamjudo

4 жыл бұрын

All it takes to measure the relative pressure generated underneath the hovercraft directly in terms of mm of water are a flexible tube, a bowl of water, a ruler marked in millimeters, and misc supplies to hold everything in position. Find a large flat surface and tape down one end of the flexible tube. Bring the other end over to the bowl of water. As the pressure should be the same at both ends of the tube, if you stick the tube into the water no bubbles should appear. Likewise, water should not climb the tube. Make an elaborate test stand to support the hovercraft at a suitable hover height over the surface, centered on the end of the tube. Alternatively, make 3 piles of foam core 10mm high and put the hovercraft on the 3 piles. Clamp, tape, or use a weight to prevent the hovercraft from leaving the test stand. Throttle up the hovercraft to a suitable test throttle value. This should produce a positive pressure underneath the hovercraft at one end of the air tube. Submerge the other end of the tube in the bowl of water. Raise and lower the end until the bubbles just barely stop. The depth of the tube at that point corresponds to the relative difference in pressure in terms of mm of water. Calculate the area underneath the hovercraft. Multiply area as measured in square millimeters by the depth where the bubbles stop and multiply that by the density of water in terms of grams per cubic millimeter which is 0.001 (1 milligram). That will give the lift due to the positive pressure, aka the hovercraft lift. Weigh the hovercraft. Measure the lift at various heights and throttle settings until you get bored.

found a subscriber right here! hearing your passion for these things and just how you like to test things in an entertaining way is awesome man

I love it when you science guys actually build things to help the rest of of see concepts in action. But I do have one question. Wouldn't the fans still produce some amount of lift even if they were mounted to a flat surface of similar size? I may not be visualizing all the forces correctly but it seams as if act of pull air downward and then redirecting it straight out horizontally would result in a net lift even without any Coanda effect.

@fisch37

2 жыл бұрын

The air will apply a force to the surface, so I think they'll cancel out. I'm not quite sure though

@dakotaeaslick1733

Жыл бұрын

Lol yeah, I'm pretty sure his wing concept was not doing much if anything. It is just a helicopter that only produces enough thrust to lift 80% of the weight making friction negligible. I assume a flat sled would work just as well. Still super fun project, glad I watched.

@TlalocTemporal

4 ай бұрын

​@@fisch37-- If there's a net downward motion of air, then there must be a net upward force to match. Definitely much worse than a normal helicopter, but sucking air downward is still something.

The Helicopter effect takes over when it starts flipping.

13:55 *deja vu starts playing*

Beautiful hovercraft, I like your work!

The best coanda effect leaf collector I have ever seen!

"Hey, what if a hovercraft was designed like a helicopter, and instead of having seats for passengers, we put propellers."

@datguymiller

3 жыл бұрын

It's for cargo, obviously

@growthisfreedomunitedearth7584

2 жыл бұрын

in this design the passengers would be inside.

@aaronfreeman5264

2 жыл бұрын

A Surface Effect Vehicle could be modeled on our "Drones." I don't understand what you mean by replacing seats with propellers.

@DannySullivanMusic

2 жыл бұрын

that's right. 10000% perfect

ayyyy new Stanton!! I'm printing your flying wing next to me right now bruv

@MrJob91

4 жыл бұрын

@dante bromkovsky lol that will take agrs

You made a thing marketable as a toy that picks up leaves, you have earned my 6000000000% respect

Always entertaining and education Tom. Keep up the great work :)

Great idea! I've never heard of the Coanda effect until now, interesting... If you lower the endpoints on your transmitter to just below the point of when the craft tends to "lift off" you can run it at full throttle on the transmitter, but it's only sending the limit you set with the end points (if that makes sense). That may help control it better by not giving it too much lift.

I first read “Canada effect” hahaha 😂

@BeautyWillSaveUs00

4 жыл бұрын

what will happen if i fill it with poutine and cover it in maple syrup?

@Allan_aka_RocKITEman

4 жыл бұрын

*_EH?!_* 😊😊😊

@corison2058

4 жыл бұрын

BeautyWillSaveUs00 dang it! You beat me to it

@Artem4egg_

3 жыл бұрын

@Flyingcrocodile46 ha... Wait... WHAT?!

@marioradu3965

3 жыл бұрын

Henri Coanda was a romanian inginer

Truly some of the best content on the web! 👍🏼

THAT JUMP OVER THE GRAVEL TRAP WAS SICK

This clearly works pretty well, i'd love to see how it differs on a smooth floor surface and over water too.

The coanda effect makes it more likely for the craft to tip over. Say you're sliding to the left. That means there's airflow from left to right (relative to the craft) Thus the coanda flow on the left side is going against the airflow caused by movement which means higher pressure and lower lift. At the same time the flow on the right side works *with* the ambient airflow which increases lift. That process is going to tip the craft over on its left side if my reasoning is correct.

@jajwarehouse1

4 жыл бұрын

Correct. This was the same problem that was run into with the VZ-9 Avrocar.

@davidelzinga9757

4 жыл бұрын

Seems like this may have also contributed to the nose dropping during forward movement. Incoming air may have slowed the movement of air going towards the nose of the craft. I wonder what the result would be of attempting a hybrid hovercraft, having a small hole under the lift fans, or moving the front lift fan closer to the nose

@jajwarehouse1

4 жыл бұрын

@@davidelzinga9757 Yes, that would be the problem with the nose dropping, also. Millions were spent trying little things like that because it always seemed they were so close and only needed one more little adjustment, but they could never get it to work well. Eventually, after making enough modifications, it would be either a helicopter, an airplane, or a conventional hovercraft.

An electric leaf vacuum cleaner for my lawn! Hey Tom, you are the next generation Dyson. Thank you for the great videos .

Excellent experiment treating the hovercraft surface as an airfoil, which incidentally suggests that the conventional hovercraft design has an inbuilt flaw, i.e. the fast airflow on the inside of the surface causes a lower pressure area and thus a downwards Coanda pull on the craft, which counteracts the pressured air lift effect. Food for thought.

Love to see that run with smoke or vapor to show effect of air flow.

Tom, I challenge you to build a working rotodyne. Keep up the vids, love to see a new one uploaded every time.

So Tom, essentially what you made is a very inefficient vacuum cleaner that's shaped like the speeder that Luke Skywalker had on Tatooine??? That's actually pretty cool

That was completely excellent

You’ve invented a Coanda Effect leaf Roomba. Brilliant!

@hadoukan722

4 жыл бұрын

How about adding colanders to it making it a Roomba coander colander

If you add two Servos to the thrust propellers, you could control the jumps or even fly with it as a vector-thrusted vehicle!

@FeLix-fj1gu

4 жыл бұрын

Nice

@adobedoug2564

4 жыл бұрын

That would add roll, you could have pitch just controlling the lift motors separately.

I had to come back and say thanks, I got to answer a real life question on a totally random thing by explaining the coanda effect. I felt so smart and cool 😎

I'm more impressed on how nice the yard is!

Do you think the lift is really caused by the Coanda Effect or is just the expected "convential lift" caused by two propellers on top of an object?

@triplem9805

4 жыл бұрын

Would a baffle above the main props reduce any direct lift, and prove whether or not the coanda effect is the main reason for lift?

@forcemultiflier1746

4 жыл бұрын

I was thinking of writing the same thing , yes -I think it's just a clumsy Helicopter !

@badw01f23

4 жыл бұрын

Not 100% sure but I don't think it would be conventional lift. The props are pushing air against its own body which is mostly flat on top. If it wasn't for the curved sides (causing this coander effect) then it wouldn't gain lift. Similar to how a helicopter with a large flat board attached to its legs won't take off.

@mkj161996

4 жыл бұрын

@@badw01f23 Considering how large and close to the edge the propellers are, I don't think it's possible to completely rule out the viscosity of the air causing some vertical lift. You can see in rotor airflow tests that there is a significant airflow change up to around 1/2 the length of the span past the propeller. A test with a rectangular hovercraft would be great to see.

@hannorasmusholtiegel6044

4 жыл бұрын

@@triplem9805 no ,the propelers would not suck enough air to the bottom and it would not work

Great video. The velocity of the air hitting the leading edge increased the lift that edge, hence the flips and instability. Having adaptive electronics to balance this would make the whole craft far more stable. Perhaps, properly flanged, ducted fans would be a better option than propellers, as you will lose less flow sideways and give greater thrust control, with increased efficiency. Remember that most (almost all) hovercraft plenum chamber fans are ducted for that reason.

Great leaf-oriented outdoor vacuum cleaner

I think the leafs colected show that a flat base would drastically improve your lift, I think there is some suction effect where the airflow rolls all the way into and up the bottom of the craft.

Luke : "Can I have my landspeeder back now ?"

I like the fact that he just had to make a line stretch and retract to animate the propeller

Top stanton you're a great engineer

Excellent work

As always a great and interesting video. I would have loved if You had attached some "streamers" on the hull and maybe an "fpv camera" inside the "cavity", All so that we might have gotten a better picture of the "airflow" over the surfaces... As always a fantastic watch, thanks a million for sharing Your passion. Best regards.

Next time: Coander effect leaf collecting gardening robot...

This dude is a genius!!

Imagine watching TV or reading a magazine and you come up to a section of "Tom Stanton's amazing inventions"

the slomo parts seems like a gymkhana parody.. kinda like it :D

Me watching Tom play with a Hovercraft in his room with fast-spinning propellers with no safety walls or features on: *rapidly bites fingernails off*

Good work Tom!

The slo-mo is majestic

You should try cutting holes below the props to let some air into the body and make this a hybrid classic/coanda hovercraft. Maybe that increases stability / lift.

@butchs.4239

4 жыл бұрын

That, or try adding ballast around the bottom edge to counterbalance the weight of the motors and lower the CG.

Hi, Tom, pretty cool project! I have a suggestion. Have you ever thought about smoothing out your 3D printing parts? I've already smoothed a few ABS parts myself with acetone vaporization and was surprised how well it works. The advantage of this would be that in projects like this, your surface would be smoother and there would be less turbulence and air friction. Especially with the Coanda effect this can be an advantage! I am looking at the blue motor-mounts or the drone motor mounts from the last project.

@zuestoots5176

4 жыл бұрын

Fun fact. acetone vaporization is a way to clear foggy plastic vehicle headlights.

well done concept build

You're a great teacher.