Blowing Your Own Sail Actually Works

[@lumsdot]

glad you fixed this, reverse thrusters on jets have been about for decades

[@gustavgnoettgen]

@hv a gooday Liking your own comments doesn't fit your religious beliefs.

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@4ae109]

@@Let_The_James_Begin LO

[@dwightfry99]

@@Let_The_James_Begin LoL. I just posted a Varitasium video that I'd like to Action Lab to address. kzbin.info/www/bejne/r3TWmKKCmMSZsKs The physics between the two situations are different, but the counterintuitive nature of them both are on par with each other.

[@dwightfry99]

@@Let_The_James_Begin I just watched the video and he didn't debunk it. He made a claim that glass cutters put the thickest parts at the bottom. That may or may not be true. He never addressed the issue further. In fact he actually spent most of the video explaining how liquids and solids are basically the same thing. He focuses on flaws in the crystalized (solid) structures that shift over time to create flow. And vice versa, liquids under intense pressure behave as if they were solid.

[@lukepowers8122]

That dude blowing himself with a leafblower was really funny... I regret that sentence.

[@DogeKingChris]

😅

[@PageUnavailable2]

Oh no

[@collinkhan4163]

BUT IT’S FUN!

[@LiterallyMeRyanGosling-0]

@@collinkhan4163 stfu

[@lonsbury]

@@LiterallyMeRyanGosling-0 Congratulations on not understanding high school physics

[@DynamicFortitude]

Note: always show runs in both directions, to counter any possible slopes.

[@watcherofwatchers]

That's unimportant when illustrating ideas and concepts in a 5 minute YT video. You're never going to get complete information, and many variables will not be controlled for. If you doubt it, build your own and test against slopes.

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@GustavoBeta32]

@@easha5706 wtf u saying lmao

[@thebigmacd]

@@watcherofwatchers I read it as a reference specifically to the clip of the guy at the gas station. Looks downhill to me, which would explain why he was going faster than expected.

[@anshik.k.t]

@@easha5706 i love football

[@theoracle4035]

Him: We need to use the traditional curved sail Also him: *Proceeds to use a cube*

[@TheAllMightyGodofCod]

It was NOT a cube.

[@theoracle4035]

@@TheAllMightyGodofCod Yeah kind of a half cube

[@NotAgainEnzo]

Square

[@SMILE-su2fo]

Square is 2d

[@buzzshocker1805]

@@SMILE-su2fo So is your crush.

[@tayzonday]

I had to read twice to see “Sail” in the title 🤯

[@Newt2799]

Chocolate Brain.

[@zaytaz9331]

.niarB etalocohC

[@internetuser8922]

This is a great example of the "Utah" accent. Sail sounds like "Sell" - they also tend to say "Melk" instead of "milk" / "acrost" instead of "across" / "bolth" instead of "both" / "Moun'in" instead of "Mountain" where ' is a glottal stop.

[@banesrb]

Tay!

[@the.shazaib]

*i move away from mic to breathe*

[@cr7fanatic164]

R.I.P to anyone who thought he would go to sea and blow his sailboat

[@unitedspacepirates9075]

Probably blow a seal by mistake

[@audigamer8261]

@@unitedspacepirates9075 LOL

[@crazyyash3488]

*Sad black pearl noises

[@a1fastyellowkitten780]

blowing the seal was destined to happen

[@jayfredrickson8632]

@@unitedspacepirates9075 As long as the seal gives consent.

[@dwightfry99]

I remember that video. I'm glad you finally addressed this. I still don't think you explained the situation very well. The leaf blower misses the point on why this was such an amazing experiment in the first place. Like in your original video, blowing your own sail is considered troll physics because it shouldn't work. The air flow pushing against the atmosphere pushed the cart backwards, but the air flow pushing against the flat sail pushed it forward. They counteract each other. The air flow dispersed in all directions after hitting the flat sail which all counteract each other. This experiment isn't awesome because your can hook a tube up to a leaf blower and make it blow backwards. What's awesome is that forward/backward forces counteracted each other but the air flow persisted. The 360 degree disbursement of air flow counteracted each other and the flow persisted. At the at the very end of the system, the air-flow hits a curved surface and that's when force finally gets directed in one direction. The leaf blower was just a tube directing the air and it behaved as one would expect. Using the leaf blower as an analogue excluded the counter intuitive nature of the curved sail experiment.

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@OnlyOnMondays77]

@@easha5706 bruh solid water... just freeze that shit

[@widowmaker4097]

So whats happening and what ur saying is its something happening to gravity to make it push foward, when air is moving backwards behind something? Because when i saw this video thats the only thing i can understand from it. This used to make sense because i never thought that deep about it

[@dwightfry99]

@@widowmaker4097 Sorry, but gravity isn't part of it. Its all about the air flow. I'll try my best to illustrate in a comment. ----------------- ---> This is initial air flow. Fan blows this direction | ---> Air flow hits the sail and pushes forward. (Wind pushes a vehicle forward) But since the fan was pushing the vehicle backwards and the air flow hitting the sail pushes forwards, nothing happens. They cancel each other out. (There are caveats to this situation when the sail or fan is set at an angle. But don't worry about that now. The Action Lab's original video focused on the cancelling of these two forces.) At this point, blowing your own sail is seen as troll physics. You shouldnt be able to pull it off because forward and backward forces contradict each other. ----------------- But the air flow doesn't stop. Some goes up, some goes down, some goes left, some goes right, and it goes at every other angle. With a flat sail; left and right counteract each other, up and down counteract each other, and all other directions counter act each other. A flat sail means the vehicle wont move. ----------------- BUT if the sail is curved then you can still direct the air flow in one direction and provide force in the opposite direction. (Almost as if this entire system is acting like the fan) Air that moves up is directed this way

[@widowmaker4097]

@@dwightfry99 can you explain the leaf blower? I dont know what im not grasping with the leafblower one.

[@blackstar2008]

Veritasiums last video about moving faster than wind speed is really mind blowing

[@mireillelebeau2513]

@@ModeratelyAmused good point

[@farpasmasterfarpador9092]

@@ModeratelyAmused Actually, that's exactly what is happening and you didn't get it

[@eagledee7753]

pun intended? :P

[@MarkoMikulicic]

@@ModeratelyAmused as it often happens in physics there are many alternative ways to describe the same phenomenon. Reasoning about pressures is often a compelling viewpoint but it's not devoid of it's own traps as well. Imagine stretching the walls of the box in front of the fan so that they wrap back behind the fan and seal it off in a cube. Now, the air blowing towards the front wall is creating a higher pressure on that wall (compared to atmospheric pressure outside), and also the suction on the hind side of the propeller is creating a lower pressure on internal side the back wall (compared the atmospheric pressure outside); if you only look at the pressure differentials acting on those two surfaces you may conclude that a force is exerted on the cube in the forward direction, while clearly that would be violation of conservation of momentum. There is clearly a flaw in the scenario I described above, but thinking solely in terms of pressures can easily lead to such traps. A similar duality of interpretation happens when reasoning about airfoils: common explanations about why wings produce lift involve talking pressures above and below the wing. While it is true that the pressure above the wing is lower than the pressure below the wing (and lower than atmospheric pressure), it is also true that the wing does deflect downwards a mass of air that perfectly balances out the upward momentum impressed on the wing. This physical fact is somewhat obscured by the fact that many textbooks describe idealized airfoils, by just looking at the section and assuming that the wing is infinitely long; wings with infinite area effectively create a downwash of 0 velocity; the only reason this doesn't break conservation of momentum is that such infinitely wide wings are simply non-physical to begin with. OTOH, a momentum theory of lift is (marginally) harder to explain precisely because it involves reasoning about the full 3d shape of the wing and thus often people who approach aerodynamics tend to first get acquainted with the good old pressure differential theory (of which sadly there are a few flawed variants around). It's important to not mix cause and effect; both pressures and downwash are related to each other; they are effects of the mechanics of pushing an object of a given shape through a fluid. The air moving downwards far behind the wing clearly cannot cause the wing to move; all forces are ultimately transferred by "contact" (which in turn is nothing more than just the electrical force between atoms when they are close enough); but such contact between air molecules and other air molecules and other air molecules and the ultimately the wing, produce an effect of downwash that MUST object the laws of conservation of momentum. Since we know that, we can use that principle to guide us to understanding how the elementary forces must have acted on the surface, even when it's hard to actually compute the details.

[@MarkoMikulicic]

@@ModeratelyAmused the air flowing backward is a perfectly good proxy for deducing where the actual forces on the object are. The reason I'm replying to you is that literally said that James's explanation is not "real physics", with more than a hint that he has no clue about what he's talking about, which is wrong and I wanted to offer readers of this thread an opportunity to understand that (I don't care about convincing you in particular, there is a community of people interested in science out there, who like to skim through comments and learn stuff, so please don't be offended for "lessons", don't worry they are not meant for you). FWIW, James knows what he's talking about and is IMHO a wonderful science communicator. Science communication is about explaining complicated things in a simple way. One consequence of that is that you clearly cannot bake in a full physics book in a few minutes video. Any simplification must be understood in context and the reader should apply theen.wikipedia.org/wiki/Principle_of_charity and not smear in bad faith.

[@LupercaIia]

I love how this is connected to the veritasium video

[@TurinTuramber]

That treadmill car sure was unintuitive.

[@christianhorner001]

Actionlab is the wish version of Veritasium

[@conanichigawa]

That video made Derek at least 10,000 USD richer.

[@sahanfernando4414]

no it isnt this is using an external energy source (bateries) and this is literally just like getting an engine and then making it face the otherway. this is also very inefficient and simple

[@michaelvonreich74]

Love em both

[@jeffpkamp]

I feel like you need to get a mop bucket and that exact model of leaf blower and an umbrella before you throw shade on the janitor. :).

[@shrivathsprabhu1137]

i really had hoped he would sit on a boat with a curved sail but he didnt lol

[@Kraken1516]

Same lol

[@Wyeke3]

I accidentally misread the title as: “Blowing your own snail actually works.”

[@v-rdays7525]

@Aviskyer Dirty mind XD

[@kellymoses8566]

I love how you can still see the ferrofluid stain on the garage floor.

[@gardenlifelove9815]

I love the physics behind this.. technically you're not blowing your Own sail.. you're actually producing reverse thrust with the air after the fan blows it into the box.

[@robertschlesinger1342]

Interesting and worthwhile video. A recent technical paper showed that even light sails must be billowing.

[@samaelm9482]

It’s just just like blowing in the opposite direction. Here instead of blowing directly into the other direction, the sail actually redirects the air in the opposite direction. Blowing directly into the opposite direction would be way more efficient than , redirecting the air using sail . So if u ever get stuck in the middle of the sea with an boat with an sail with no moving air , blow in the other direction and not into the sail … hope u survive and have big lungs 🫁 :)

[@johansmitphotography]

But what I don't understand is the suction would want it to move the other direction.... the one side of the fan blows and the other sucks... so why doesn't it counter each other out?

[@rednammoc]

@@johansmitphotography think of it as the force *on the fan* from the high pressure side (the "blowing" side) is in the same exact direction as the force *on the fan* from the low pressure side (the "sucking" side) so there is no cancelling out.

[@MadScientist267]

@@rednammoc There is cancellation (one reason why it doesn't have as much thrust) but it's due to recirculation of some of the air. That said it indeed works and there's a whole bunch of examples in the sky... Thrust reversers on jet engines exploit this large scale.

[@henrygaraffa5584]

@@MadScientist267 Unless you are intaking from the same point you are exhausting there is no cancellation. you may get torques or increased drag from poor intake placement. By your logic a rocket engine is more efficient than a jet engine, which we know isnt the case.

[@MadScientist267]

@@henrygaraffa5584 No, a jet engine doesn't suffer any issues because the intake and exhaust are on the same axis (and direction) for normal operation, and while reverser ducts are not even close to 100% efficient for various reasons, there's a lot more than just the intake air blowing thru the engine and coming back out of the ducts. If those were ducted fans, it would be all but pointless to do reversers as implemented. Reversers also most certainly do demonstrate (one of their) reductions in efficiency by recirculation... It's true most of the loss is the direction change and off axis vectors... However it is ill advised for example to use reversers where there is debris on the landing strip, due to the threat of it being kicked up and sucked into the engine... This is an indirect result of that recirculation. Again, debris induction issues aside, a jet is pushing a lot more out the back than it's sucking in the front, so those forces don't cancel out anywhere near as much. This translates back to the video because there's nothing increasing the thrust (edit: eg no combustion adding mass and accelerating everything further) in the prop, only the energy the motor is giving it. When that air comes back around from the deflecting device, pointing backwards, vortices guarantee some of it will be curled back around and into the suction side of the prop. This translates to significant lost thrust because the circulating mass provides no net force on the vehicle... And... If turbulence is excessive, the prop will unload, decreasing system efficiency even further than it already is. In a nutshell this is a cool academic demonstration but between this and the reversal and associated drag losses, has less than zero chance of showing up on a commercial (or otherwise non-toy-like) design because it's mostly a "how much can you steal and it still goes" deal 🤣 If you used a ducted blower with a well placed intake, in that situation you'd be correct, no recirculation, no loss of thrust due to that mechanism. Correction - there would *still* be recirculation, just not via the blower... Entrainment of the vortices... A little bit different but a similar end result. Unless you ducted the "sail" (reversing device)... But now you're just in "really badly designed nozzle" territory, and the whole thing kinda starts to lose its original appeal 🤷‍♂️

[@jbirdmax]

Sorry for the late reply, I had to try this one for myself. It works well as long as the umbrella has a steep curvature as in the original video. We mounted two umbrellas onto two separate scooters. We used a 24V LiPo powered blower from Home Depot. Here’s the rub: As long as your umbrella has enough curvature, you aim the blower at one side of the umbrella (as was done in the original video if you look carefully) and it does an exquisite job of redirecting the air backwards. Keeping in mind that the blower has to be aimed properly at one edge of the concave of the umbrella. Scooter #2 had a less curved umbrella and we only got up to 2MPH. Scooter #1 had almost 180° internal angle providing optimal telemetry and worked with amazing results. Scooter #1 got up to 14MPH. I did record it but I’ve never uploaded a video from my camera. I’ll give it a shot when I’m not working.

[@aleksitjvladica.]

I want this!

[@akivag]

Wow the action labs ideas just keep getting crazier

[@Ken-vz7qy]

ik right

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@videoseeker117]

More like "cleverer" There's nothing crazy about science physics if you think about it

[@sufipunk18]

0:42 when your crush tells a joke that isn't even remotely funny, but you still gotta laugh

[@Khelleyne]

We need more channel like that man. More science, maths, astronomy, etc, etc. This world is filled with wonders and and people need to learn about them. Thank you for sharing your knowledge like you do man, it's always a pleasure to learn new stuff.

[@gregorysalt5710]

The guy answers real questions and things I think about. I love this channel

[@razorblade7108]

I got a quiz in a job interview some years ago and the interviewers didn't understand how the air would be redirected by the sail when it bulges out, causing a small thrust pushing the boat forward. They insisted that the boat would not move at all, even after I tried to explain it with reverse thrust on airplanes. Later I found out that some people actually used a fan on a boat with various sail types and proved my point.

[@freddykugr]

on the umbrela you do spread the force backwards to propel you forward , true or not

[@a.s.3904]

There's Mythbusters who would have stopped when the myth was busted, and then there's Action Lab, busting the busted myth and making it possible.

[@tristindurocher-batley4780]

I already know from mythbusters that it’s plausible to blow your own sail you just need a powerful enough fan for it to work with a regular sail

[@adrianleighton2771]

Also note the janitors umbrella was caved inward showing his forward movement through the air was more powerful then the leaf blower to "inflate" the umbrella and push him forward. Pretty much think he's just rolling down a hill.

[@NitroniumGaming]

Hey, Action Lab! Firstly, I love your videos. With this particular video, I would like to add a little bit more. There are always 2 parts to moving something. The speed and direction of the exhaust, and the speed and direction of the intake. The leafblower and screen setup would have worked, since the leafblower takes in air from the side - and exhausts air backwards giving a net positive force. Of course, it was flawed in practice due to the system being extremely inefficient. The cardboard box example works for 2 reasons. Because the exhaust is backwards, and more importantly, because the intake is more from the side of the box - imagine if we intake air from a big chute and exhaust it in the same direction through a straight pipe. The object will move against the intake direction due to the exhaust angle being tighter.

[@gregbell2117]

Good points. I also found it odd that he left out the momentum of the intake air. In his video on put-put boats, he puts it straight, since they take in water then expel it through the same opening... how can that result in thrust?! It has to do with how focused the intake vs. the expulsion.

[@NitroniumGaming]

@@gregbell2117 thank you for bringing me back to this comment! I will retract my previous statement as I believe I was mistaken. The intake direction does not matter, only the exhaust. This is because, if you imagine a jet engine stationary, the thrust is directly proportional to the change in momentum of the air. If you make the jet engine intake from the sides, or even behind, what's the change in momentum? Still the same because the initial air is not moving, and final air moves at exhaust velocity. Of course, it's possible that drawing air in from the front is more efficient due to lower resistance and suctioning air outside of the engine to flow that way too, this is essentially what bypass is. I hope I explained it well, lmk if u have any questions

[@QuasiRandomViewer]

4:47 "I'm still going to say it's fake because the amount of thrust he got from that leaf blower just wasn't enough to move that fast." There's also the fact that his Troy-Bilt TB180B 180-CFM, 7.5-Amp, 120VAC corded leaf blower, is unplugged. At 0:10 you can see both the model number and the empty electrical plug.

[@metalrain4580]

Good eye but how did you miss the electric skateboard the bucket was sitting on ?

[@jasperstevens1591]

I heard about a guy who hurt his back trying to blow his own.

[@MajinManGTZ]

HMMMMMMMMMMMMMMMMMMMMMMMMMM

[@robertthompson6352]

😀☝🏼 one moment there

[@du42bz]

It actually works and is really nice if you can do it

[@trolly4233]

@@du42bz sir, read this again out of context

[@Cantpickgoodhandlename]

This is like holding yourself up with your shirt, but with SCIENCE

[@sirgigiuaswattiuas4213]

the lorax was 10 years ahead of us

[@georgehill3087]

Pulling yourself up with your shirt or hair or whatever doesn't work because the energy is contained within yourself. Whereas blowing your own sail works because energy can exit the system.

[@Cantpickgoodhandlename]

@@georgehill3087 joking but ok

[@you.got.gapped.racing]

Now, I will use this to cool and push my instant noodles to my dorm table

[@butterflybeans]

I appreciate people that when they make a mistake, they accept it and fix it.

[@FaithlesslyDevoted]

*Guys I am finally learning science now I know Mitochondria is the power house of the cell*

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@FaithlesslyDevoted]

@@easha5706 he made that right?

[@puspamadak]

I was also interested in performing these experiments, but didn't have all the necessary resources. You are doing a great work by showing practical demonstrations of science to the curious ones!

[@Regularsshorts]

Putting a curved sail = turning the fan 180°

[@alessandrocarinelli4200]

But far less efficient

[@Regularsshorts]

Yeah

[@Regularsshorts]

If you use a holo donut shape cut in half it would be efficient

[@metamorphicorder]

Doesnt equal. But if you are in a situation in which your thrust source direction is fixed and attached to the payload you are wanting to move, then using this to redirect your thrust is a way to get SOME thrust. Its not going to be as much as if you could just turn the thrust.

[@brantwedel]

I wish you would have covered where the air is coming from. (It's coming from random directions, but being directed in a specific direction which is why you have greater force in the direction the air is blowing)

[@bitslay]

Reminds me of Veritasium's going down the wind faster than the wind

[@GoonNationZa]

I have always wanted to conduct this experiment. Had to solve it theoretically. But im glad the results were confirmed.

[@shiploshs]

"F" for world most useless leaf blower

[@suprith-science1441]

F

[@tssage2975]

F

[@Amit_Pirate]

F

[@kscfengshui]

F

[@zaynel-borno7387]

F2

[@Resonanttheme]

Brings to mind watching the thrust reversers swing into place when landing on a typical commercial flight.

[@creepikachu4700]

The way he explained everything in a fun way makes his video so enjoyable to watch

[@ironclad452]

He's truly a marvelous teacher, isn't he?

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@haze6989]

In the action lab first experiment with the flat surface why doesn't the vehicle move right relative to the camera since the air leaves through the prop in the opposite direction.is it because the air is reflected back at an equal speed to the air leaving the prop or?

[@yuvarajr616]

Sir your videos are amazing . I'm your fan from India. I'm also a chemical engineering student.😁 Your videos are very useful for me.

[@easha5706]

Oh ok I am originaly from India too but not born there

[@yuvarajr616]

@@easha5706 ok bro

[@rohithraj3134]

Ho mi God ☁ 👋🚀 ☁☁ ✨ BYEBYE* ☁ ✨ 🎈 ✨ ☁ ✨ ✨ 🌾✨💨 🏃 🏠🏢

[@pierceschmeichel8711]

Thank you for being a humble guy and making a correction video

[@milanb5735]

It better to turn the fan backward instead of putting a sail or Curved surface LOL

[@devanarayanan2823]

Yeah 🤣🤣😊

[@zaytaz9331]

Yup

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@markusosterle3958]

Vers nice to see that you uploaded this to correct the old disprove video!

[@FaithlesslyDevoted]

*The most efficient way is to simply blow or release the air on the opposite side....S I M P L E*

[@yourmomlmao9638]

or change the pitch of the blades, like in the GA industry

[@ProjectPhysX]

The key to this working is the high Reynolds number or turbulent air flow, because it is not symmetric. If you build this on a microscopic scale where all flow is time symmeteic, it would not work. In this case, you would need some sort of asymmetric system. Bacteria do this with spiral flagella for example which are not symmetric.

[@Gogoi-5629]

Loki episode 4 is Freaking awesome... What a love between 2 Lokis..

[@uck7185]

Pekka is my favorite coc

[@fardeensaifi3001]

@hv a gooday 🤍

[@nanigopaldutta9094]

Awesome episode by the way ..I just started cursing after she killed mobius and loki

[@richardwilliams3497]

Who cares

[@whitepirate4098]

Can u help me try to get him this idea Place the worlds bounciest serface on both sides top and bottom and place a ping pong see how fast it moves

[@andyjohnson4907]

Now do the same experiment with a water jet. That's a serious suggestion. I have no idea what would happen.

[@sourbaryonai6592]

Here from Sidemen Reacts...guess Vikk won

[@Frank183847572828]

4:45: The video was very short and not very still but there is a slight downhill which could have helped him gain some speed. I don't think it would be very effective uphill even a little. Also, looking at the full video, the garbage thing is modified, he is actually using the bucket frame on top of a skateboard, these have pretty good ball bearings. Add some Silicon Lube and you got something with very little friction. This is also why he is hovering left and right... hard for him to stay stable.

[@ricolopez8253]

Nah that video was real, that’s y it’s so damn funny 😂

[@TheJohtunnBandit]

I wonder if there may in fact be a benefit to flowing the air into a parabolic dome instead of using the fan directly, similar to the fluidic thrust propulsion in the new Jetoptera test aircraft. I would love to see a video where you mount your leafblower or similar to a meter measuring thrust, and experiment with different shapes to get a bunch of data points.

[@johnnygalt5867]

if I could blow my own sail I'd never leave the house

[@easha5706]

My dream for you, action lab to make is : melting wood or solid water or shape holding glass

[@RubensASMR]

2:46 Don't mind me just taking my leaf blower for a walk.

[@commander_frog]

The ultimate scientific tool, cardboard

[@jamesputnam8536]

And duct tape.

[@Marcelelias11]

This but unironically

[@blaster-zy7xx]

I used to work developing baby incubators. Guess how we modeled the air ductwork for our prototypes.

[@kayden2537]

I glanced at the title and thought it said how to blow you own SNAIL. 😂😂😂

[@tennessine5928]

maybe you can make the action lab kids and take me in there

[@tennessine5928]

I am serious because I love physics

[@andy_2195]

I’m always learning something new from your videos honestly

[@jplxlabelle1681]

Ok, what did you learn here? I’m very interested to find out what you took away from this.

[@lamar239]

So somehow if I end up being stranded in Pacific Ocean ill just use my breath to survive

[@danielversiani]

Cool take on the subject. Though by the thumb picture I thought you'd mention mordern sails on sail boats which work best paralel to the wind and that maybe thats a way to propel yourself forward by blowing on your own sail from the side. I think that this would make a very nice experiment. Especially because most people don't understand how a modern sail boat sails.

[@sunayanapatil4784]

If He was my lecturer I would have 90% attendence 😁.

[@Ken-vz7qy]

yes its entertaining

[@neodong6060]

just 90? what about the other 10%? vsauce?

[@sunayanapatil4784]

@@neodong6060 imagine if I was ill and I took leaves.

[@ContentInflux]

@@neodong6060 yep

[@shruthisrikumar5907]

Same likes and replys yay

[@1.618_Murphy]

I'm just going back and forth to *Veritasium* and *The Action Lab* to observe all these "wind-turbine-based vehicle experiments"!

[@tarickfn7335]

Somebody else could hold the leaf blower that is not standing on the cart.

[@humanbeing1429]

Isn't that the same as you lighting your own cigarette or someone else lighting it for you?

[@positronftw]

Then That Person Must Stand In A Veichel To Follow

[@artisticyeti22]

@@humanbeing1429 lol no

[@georgehill3087]

Then it's not blowing your own sail anymore.

[@tarickfn7335]

@@georgehill3087 yea

[@thegodlypotato4610]

The air doesn't exactly bounce off the sail bc if it did then the flat sail would work. Remember, the coandă effect. A curved sail works because the air follows the contours and redirects the air in the opposite direction, whereas a flat sail disperses the air. Like when I wash the dishes and let water run on the curved face of a spoon and it bounces back at you, that's the curved sail. But if you put water on something flat, it would just be dispersed.

[@DynamicFortitude]

Wow, it took me almost 5 minutes to understand that you say "sail" and not "cell". 4 minutes of: what cells is he taking about?

[@vanessarayfox]

He’s NOT saying cells?! I just figured it was “science lingo.” 😂

[@internetuser8922]

Utah accent activate. Also listen to how people with this accent say "milk" "across" "both" & "mountain"

[@beyse101]

Finally, thanks to your Channel and Veritasium, 2021 becomes the year were humanity figured out how wind works.

[@nanigopaldutta9094]

Wow just 3 min ago and I jumped to see my man 😆

[@healthandbeauty9457]

At about 3:15 in the video, why did the vehicle go in a circle instead of straight in the opposite direction of the airflow as it did the other times?

[@AnthonyTo]

Plot twist: the vehicle is remote controlled.

[@narukami597]

Maybe you should have tested whether blowing air at an umbrella can propel you by blowing air at an actual umbrella?

[@realkvse]

In the original video tho the guy was definitely on an electric skateboard

[@3DLasers]

One of the very first Internet Queries I did on the Internet some 30 years ago under "Space Station Freedom" which brought me to something a German Scientist I believe developed in WWII. The Vortex Thrust Generator which from first thought you would think be impossible but the lift/thrust it develops is just awesome... Simplicity is perfection... My very first design rule anyway...

[@amirrifqi1772]

*That's just an airboat with extra steps.*

[@MrT------5743]

Except it had wheels and was on a solid surface and not water.

[@amirrifqi1772]

@@MrT------5743 that's why I said 'with extra steps'. And if I'm not mistaken, airboats *can* go on solid surfaces

[@MrT------5743]

@@amirrifqi1772 so if by "extra steps" you mean changing a boat to a car then ok. But then you could have compared it to an airplane with extra steps, or a bicycle with extra steps too.

[@amirrifqi1772]

@@MrT------5743 Just add tyres. And I don't know where you live but cars don't run by a fan, it runs on something called an engine usually. If compared to planes, it doesn't fly, and bicycles is not powered in any way except by humans.

[@amirrifqi1772]

@@MrT------5743 I thought a family man would know this. What

[@AsperK.22]

I have a question that what if the blower end has close means like a closed circuit and system will it move from its place? What we can do to move the wind blower in closed loop from its place? Could we do anything for that?

[@r.iyushofficial5318]

First

[@CaptSoban]

We don't care

[@JulianGaming007]

Ok gg

[@r.iyushofficial5318]

@@JulianGaming007 What is gg

[@JulianGaming007]

@@r.iyushofficial5318 it means "good game". You usually say that after you play a game with someone or when someone else wins. it's also often used when someone accomplishes/archives something

[@r.iyushofficial5318]

@@JulianGaming007 Ohh Thanks for sharing this with me

[@bombee6576]

This man is the master of being happy

[@theactualcanadian8300]

A true scientist that admits his mistakes and explains why he was wrong. This channel is fantastic

[@krajpathak]

the guy with the umbrella is not using air moving backwards to propel him forward but using the umbrella as a sail to pull him forward. If you see the video he also appears to be moving down a slope, so that may explain his speed.

[@StrelitziaLiveries]

This is literally how aircraft thrust reversers on most airliners work and a notable military aircraft that has this feature would be the panavia tornado

[@Mrgnothing1]

Would it not work to have the fan on the left hand side of a boat pointing across the boat to the right hand side. Then have a normal sail at 45 degrees? Surely then the fan will cause the sail to generate lift and work properly instead of just redirecting air backwards?

[@Luqi_]

as a child we laugh at this scene in cartoons like tom and jerry, etc. and now we know, that they're really smart

[@Amit_Pirate]

Big brain > rip logic

[@sanikaaagrawal9021]

Hey can you make a video of dissection of a big single celled organism...valonia ventricosa...im unable to find any related videos....i am very curiousss about it

[@sahb8091]

Is it possible to blow your own sail and then use the forward motion of the tyres to return the kinetic energy to a battery that then continues to turn the fan to blow the sail.

[@robotnikkkk001]

=AHHH OK SO YOU ACTUALLY FIGURED IT OUT =YUP,EVEN REMEMBERED MYTHBUSTERS

[@tanaysharma657]

So let suppose I have a torch which is very luminous and attach it to some wheel and put one reflecting convex mirror. When will it move backwards? As so many photons are pushed back.

[@christianjaussi2125]

this is actually exactly how commercial jets slow down so quickly after landing. Reverse thrust: huge flaps open up on the side of the engine to redirect the jet exhaust forward.

[@mrchordstriker]

That video clip has a curiosity to me regarding the umbrella. If air were being pushed into its under side, how come the umbrella is puckered inward instead of outward? The wind from the forward velocity is puckering the umbrella inward. How can the wind caused by his speed be more force, than the wind of the blower from the other side? Is this physically possible, or is that evidence of phony?

[@mattmarinelli5241]

@The Action Lab. Now, try recreating this experiment by placing the propulsion item in a transparent box with a vacuum existing in the box, as close as you can get to the amount of vacuum of space. Do this with or without the sail, the experiment is to look for any propulsion within a vacuum space.

[@Peter_1986]

It is always weird when physics from cartoons actually turn out to have a grain of truth in them.

[@priyanshuraha]

Next video: flying saucer please 🥺

[@sunvieightmaster88]

Action Lab is getting crazier..

[@dogwalker666]

It's just thrust vectoring, The Harrier GR4 made brilliant use of this.

[@robertoarmstrong7317]

Please do a video about blowing your own trumpet next

[@solomandsouza1395]

Can you make a miniature version of a tornado? Or even a bigger one.

[@thaecrasis]

You always explain things so well!

[@dvvinever]

@The Action Lab, you should do some tests with that same box and slightly adjust the angle the air is hitting the box to see if there is a change in speed of the vehicle. Also, maybe test with some parabolic shaped sails made from plastic. Perhaps there is also some pressure differences with higher pressure in front of the fan and the lower comparative pressure on the front of the sail?

[@adb012]

Thank you for this video. The previous one was negative learning for many.

[@sumesh-kumar]

you had me in the first half of the title ngl.