Blowing Your Own Sail Actually Works
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- Опубліковано 29 чер 2021
- In this video I show you how it is possible to blow your own sail
My previous video with flat sail: • Is It Possible To Blow...
Janitor Video: • Janitor Turns Heads in...
My shorts channel: / @actionlabshorts
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That dude blowing himself with a leafblower was really funny... I regret that sentence.
😅
Oh no
BUT IT’S FUN!
@@collinkhan4163 stfu
@@BabyDontHearnMeNoMore huh?????
glad you fixed this, reverse thrusters on jets have been about for decades
@hv a gooday Liking your own comments doesn't fit your religious beliefs.
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
@@Let_The_James_Begin LO
@@Let_The_James_Begin LoL. I just posted a Varitasium video that I'd like to Action Lab to address.
ua-cam.com/video/yCsgoLc_fzI/v-deo.html
The physics between the two situations are different, but the counterintuitive nature of them both are on par with each other.
@@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.
Him: We need to use the traditional curved sail
Also him: *Proceeds to use a cube*
It was NOT a cube.
@@TheAllMightyGodofCod Yeah kind of a half cube
Square
Square is 2d
@@SMILE-su2fo So is your crush.
I had to read twice to see “Sail” in the title 🤯
Chocolate Brain.
.niarB etalocohC
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.
Tay!
*i move away from mic to breathe*
Note: always show runs in both directions, to counter any possible slopes.
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.
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
@@easha5706 wtf u saying lmao
@@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.
@@easha5706 i love football
R.I.P to anyone who thought he would go to sea and blow his sailboat
Probably blow a seal by mistake
@@unitedspacepirates9075 LOL
*Sad black pearl noises
blowing the seal was destined to happen
@@unitedspacepirates9075 As long as the seal gives consent.
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.
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
@@easha5706 bruh solid water... just freeze that shit
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
@@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
@@dwightfry99 can you explain the leaf blower? I dont know what im not grasping with the leafblower one.
Veritasiums last video about moving faster than wind speed is really mind blowing
@@ModeratelyAmused good point
@@ModeratelyAmused Actually, that's exactly what is happening and you didn't get it
pun intended? :P
@@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.
@@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.
I accidentally misread the title as: “Blowing your own snail actually works.”
@Aviskyer Dirty mind XD
i really had hoped he would sit on a boat with a curved sail but he didnt lol
Same lol
I love how this is connected to the veritasium video
That treadmill car sure was unintuitive.
Actionlab is the wish version of Veritasium
That video made Derek at least 10,000 USD richer.
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
Love em both
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. :).
I love how you can still see the ferrofluid stain on the garage floor.
The guy answers real questions and things I think about. I love this channel
In summary the answer is "Well yes, but actually no."
😂😂😂😂😂
Well, the real answer is yes. It's possible.
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.
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.
I want this!
Interesting and worthwhile video. A recent technical paper showed that even light sails must be billowing.
I heard about a guy who hurt his back trying to blow his own.
HMMMMMMMMMMMMMMMMMMMMMMMMMM
😀☝🏼 one moment there
It actually works and is really nice if you can do it
@@du42bz sir, read this again out of context
0:42 when your crush tells a joke that isn't even remotely funny, but you still gotta laugh
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 🫁
:)
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?
@@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.
@@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.
@@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.
@@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 🤷♂️
Wow the action labs ideas just keep getting crazier
ik right
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
More like "cleverer"
There's nothing crazy about science physics if you think about it
You always explain things so well!
Vers nice to see that you uploaded this to correct the old disprove video!
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.
Now, I will use this to cool and push my instant noodles to my dorm table
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!
I’m always learning something new from your videos honestly
Ok, what did you learn here? I’m very interested to find out what you took away from this.
This is like holding yourself up with your shirt, but with SCIENCE
the lorax was 10 years ahead of us
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.
@@georgehill3087 joking but ok
"F" for world most useless leaf blower
F
F
F
F
F2
Good on you for correcting yourself! :) This is why I like this channel
Thank you for being a humble guy and making a correction video
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
Putting a curved sail = turning the fan 180°
But far less efficient
Yeah
If you use a holo donut shape cut in half it would be efficient
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.
A Mt Hood T Shirt? Nice! Thanks for your videos!
Thank you for this video. The previous one was negative learning for many.
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.
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.
@@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
*Guys I am finally learning science now I know Mitochondria is the power house of the cell*
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
@@easha5706 he made that right?
Bravo!! Great video.
Thank you. Good video.
Reminds me of Veritasium's going down the wind faster than the wind
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.
Oh ok I am originaly from India too but not born there
@@easha5706 ok bro
Ho mi God ☁ 👋🚀 ☁☁
✨ BYEBYE*
☁ ✨ 🎈
✨ ☁
✨
✨
🌾✨💨 🏃 🏠🏢
Thanks for a lot of knowledge
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.
maybe you can make the action lab kids and take me in there
I am serious because I love physics
The ultimate scientific tool, cardboard
And duct tape.
This but unironically
I used to work developing baby incubators. Guess how we modeled the air ductwork for our prototypes.
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.
I have always wanted to conduct this experiment. Had to solve it theoretically. But im glad the results were confirmed.
if I could blow my own sail I'd never leave the house
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
on the umbrela you do spread the force backwards to propel you forward ,
true or not
Of course I enjoyed it, u r great
❤❤❤
When there's science, one can't create a rumour. It's impossible.
Very nice video sir. All your experiments really keep me away from all intuitions. Keep going 👏👏
It better to turn the fan backward instead of putting a sail or Curved surface LOL
Yeah 🤣🤣😊
Yup
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
*The most efficient way is to simply blow or release the air on the opposite side....S I M P L E*
or change the pitch of the blades, like in the GA industry
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.
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.
The way he explained everything in a fun way makes his video so enjoyable to watch
He's truly a marvelous teacher, isn't he?
My dream for you, action lab to make is : melting wood or solid water or shape holding glass
Nah that video was real, that’s y it’s so damn funny 😂
Finally, thanks to your Channel and Veritasium, 2021 becomes the year were humanity figured out how wind works.
This is the part 2 of blow your own. Nice 😀👍
Here from Sidemen Reacts...guess Vikk won
If He was my lecturer I would have 90% attendence 😁.
yes its entertaining
just 90? what about the other 10%? vsauce?
@@neodong6060 imagine if I was ill and I took leaves.
@@neodong6060 yep
Same likes and replys yay
I love watching you but you ALWAYS drive me buggy! It's cool though, you're still blowing me away cause you're brilliant
Just subscribed !!
Somebody else could hold the leaf blower that is not standing on the cart.
Isn't that the same as you lighting your own cigarette or someone else lighting it for you?
Then That Person Must Stand In A Veichel To Follow
@@humanbeing1429 lol no
Then it's not blowing your own sail anymore.
@@georgehill3087 yea
Wow just 3 min ago and I jumped to see my man 😆
Nice video now I understand how cars move forward 😄
Whatever you do...You've never let me down James. Ever.☺
☺
Plot twist: the vehicle is remote controlled.
Loki episode 4 is Freaking awesome... What a love between 2 Lokis..
Pekka is my favorite coc
@hv a gooday 🤍
Awesome episode by the way ..I just started cursing after she killed mobius and loki
Who cares
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
Please do a video about blowing your own trumpet next
@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?
So somehow if I end up being stranded in Pacific Ocean ill just use my breath to survive
*That's just an airboat with extra steps.*
Except it had wheels and was on a solid surface and not water.
@@MrT------5743 that's why I said 'with extra steps'. And if I'm not mistaken, airboats *can* go on solid surfaces
@@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.
@@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.
@@MrT------5743 I thought a family man would know this. What
I appreciate people that when they make a mistake, they accept it and fix it.
Brings to mind watching the thrust reversers swing into place when landing on a typical commercial flight.
In the original video tho the guy was definitely on an electric skateboard
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?
He’s NOT saying cells?! I just figured it was “science lingo.” 😂
Utah accent activate. Also listen to how people with this accent say "milk" "across" "both" & "mountain"
Reminds me of aircraft thrust reversers! Big ol’ buckets
I love how he explains while staring us deadeye in the soul
First
We don't care
Ok gg
@@JulianGaming007
What is gg
@@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
@@JulianGaming007
Ohh
Thanks for sharing this with me
Sweet video!
Love your videos
Love these vids.
Action Lab is getting crazier..
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...
you had me in the first half of the title ngl.
Watching with love in 🇧🇼🇧🇼❤️
mind blowing trick and very funny + informative
thanks for the video, it helps me a lot to teach high school physics
2:46 Don't mind me just taking my leaf blower for a walk.
This man is the master of being happy
Very satisfactory.
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.
Leaf blower shots had me singing o/' goodbye, dolly o/'
Had this one nailed at the thumbnail
Reminds me of Dereck & Steve Mould's vids about going faster than the wind downwind
Fluids can be confusing
I glanced at the title and thought it said how to blow you own SNAIL. 😂😂😂
I'm just going back and forth to *Veritasium* and *The Action Lab* to observe all these "wind-turbine-based vehicle experiments"!
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)