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Risking My Life To Settle A Physics Debate 

Veritasium
Tilaa 9 milj.
Näkymät 6 milj.
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Everyone will say this craft breaks the laws of physics. This video is sponsored by Kiwico, For 50% off your first month of any subscription crate from KiwiCo (available in 40 countries!) head to www.kiwico.com/Veritasium50

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A HUGE thanks to Rick and Neil for letting me drive Blackbird. Check out Rick's FIplace Channel for more in depth videos and explanations on going faster than the wind downwind -- ve42.co/Rick

Gene Nagata made the shoot possible. If you’re a video nerd like me, check out his channel, Potato Jet: fiplace.infof... .

Xyla Foxlin for made the model cart used in this video. Xyla builds amazing things like rockets and canoes, check it out! fiplace.info

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References
Jack Goodman's FIplace video -- ve42.co/Goodman
Rick's treadmill footage -- ve42.co/Treadmill
Rick's multiple explanations of how Blackbird works -- ve42.co/DDWFTTW
Forum discussions -- ve42.co/forum Blog -- ve42.co/blog1 and retraction ve42.co/BlogRetraction

Gaunaa, M., Øye, S., \u0026 Mikkelsen, R. F. (2009). Theory and design of flow driven vehicles using rotors for energy conversion. In EWEC 2009 Proceedings online EWEC

Md. Sadak Ali Khan, Syed Ali Sufiyan, Jibu Thomas George, Md. Nizamuddin Ahmed. Analysis of Down-Wind Propeller Vehicle. International Journal of Scientific and Research Publications, 3, 4. (April 2013) ISSN 2250-3153. (www.ijsrp.org)

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Special thanks to Patreon supporters: Bill Linder, Paul Peijzel, Crated Comments, Anna, Mac Malkawi, Michael Schneider, Oleksii Leonov, Jim Osmun, Tyson McDowell, Ludovic Robillard, Jim buckmaster, fanime96, Juan Benet, Ruslan Khroma, Robert Blum, Richard Sundvall, Lee Redden, Vincent, Marinus Kuivenhoven, Alfred Wallace, Arjun Chakroborty, Joar Wandborg, Clayton Greenwell, Pindex, Michael Krugman, Cy 'kkm' K'Nelson, Sam Lutfi, Ron Neal

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Thanks to James Lincoln for building the initial prototypes for a model blackbird.

Written by Derek Muller, James Lincoln, and Petr Lebedev
Animation by Mike Radjabov and Iván Tello
Filmed by Gene Nagata, Derek Muller, Trenton Oliver, AJ Fillo and Emily Zhang
Edited by Trenton Oliver
Music from Epidemic Sound epidemicsound.com
Additional video supplied by Getty Images
Produced by AJ Fillo

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29.05.2021

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Veritasium
Veritasium 23 päivää sitten
If you want more detail on the explanation here it is: 1. The car is powered only by the wind. There is no motor or batteries of any kind. 2. The propeller does NOT spin like a windmill. The wind does NOT push it and make it turn. 3. Instead the wheels are geared to the propeller to turn it the opposite way, like a fan, so it pushes air backwards. 4. To start the vehicle the wind simply pushes on the whole vehicle (like a block of styrofoam) and gets it moving. 5. The wheels are turning so they turn the propeller in the opposite direction to how the wind is pushing it. 6. The prop is pushing air back so air pushes the prop forwards, accelerating the car. 7. Once you get up to wind speed there is no apparent wind on the vehicle. If the prop were spun like a windmill this would mean no more thrust. But, since the prop is operating like a fan, it still accelerates air backwards, generating thrust. 8. You can go faster than wind speed continuously because even when going faster than the wind, the prop can still accelerate air backwards (in the car's frame of reference) generating thrust. In a stationary frame of reference you would see that the wind behind the propellor is slower than the surrounding air. So it's clear that the energy is coming from the wind. FAQ: If power is coming from the wheels to turn the prop, why doesn't that slow down the wheels more than it gets the prop to push back? A: Because the wheels are moving over the ground much faster than the prop is moving through the air (because there's a tailwind). Example: Let's say the car is going 12m/s in a 10m/s tailwind, so faster than the wind (note the prop will be moving through an apparent headwind of 2m/s). Power = Force x Velocity Let's say the chain applies a drag force of 100N on the wheels to drive the prop. This means we're taking power from the wheels = FxV = 100N x 12m/s = 1200W If we apply this power to the fan, it can create a force of F = P/V = 1200W / 2m/s = 600N Admittedly I've assumed no losses, but even if we waste half the power, we'd still get 300N of thrust which is more than the 100N of drag the prop adds to the wheels. The key is that we're harvesting power at higher speed, lower force, and deploying it at lower speed, higher force (which is only possible because we have a tailwind - in still air this wouldn't work because the relative velocity of the wheels over the ground would be exactly the same as the relative velocity of the prop through the air).
Aryan Komati
Aryan Komati 21 päivä sitten
I'm mind blown
Rick Cavallaro
Rick Cavallaro 21 päivä sitten
@дмитрий иванов >> How does the structure behave in calm weather? It just sits still in no wind. Or if you prefer - it can go 3X wind speed in 0 wind. :)
Noguffay
Noguffay 21 päivä sitten
@eyytee "MIT aerodynamicist Mark Drela : "In my view, the most closely controlled and unambiguous DDWFTTW demo is the cart climbing up the tilted treadmill." in the article: "What I’ve Learned About Wind Carts" by Mark Frauenfelder" Here's what I think "could" also work, though some people would still think that there are too many potentially hidden energy imputs being applied to the vehicle. Use the treadmill apparatus, sure, but in a different way, completely level. Just to prevent the vehicle from rolling forward, at first, when a fan starts to apply wind velocity/pressure from behind (I mean there is only a limited amount of runway on a treadmill). At some point as the fan is being ramped up in output air velocity/pressure, the vehicle is going to start rolling forward. At this very precise moment, stop the fan speed increase and hold it at that point (showing the audience that the fan is no longer being ramped up). Now also at this very precise moment start the treadmill to keep the vehicle in the center, by gradually ramping up the belt backward rotation in unison with the vehicle's tendency (now that the wind is pushing it forward) to NOT roll forward. At a very precise belt velocity, we will witness that the vehicle is not continually accelerating indefinitely, that the fan is set at a very precise velocity. We will be able to measure and record the vehicle speed in relation to the belt's m/s. We will be able to measure and record the velocity of the wind in m/s and compare the two. Simple. But, again, some people will think there is hidden inputs. This is why a tunnel/pipe with nothing but a fan, a vehicle on a rail (keeping it straight and giving it the wheel to ground contact required for rotation) would/should sooth these people's suspicions.
Papa Legba
Papa Legba 21 päivä sitten
@Fred Meister look up mechanical doping in cycle racing then tell me he checked properly, science-hating crackpot.
Joeri sol
Joeri sol 21 päivä sitten
It still does not explain why the speed of the prop is accelerating instead of decelerating when the vehicle is slowed down.
Artemirr Lazaris
Artemirr Lazaris 3 tuntia sitten
not sure how this sounds counter intuitive... to me it sounds correct from an older concept of use. Pretty sure you can then do an area concept calculation for the maxim per footage of air, to drag to quantify the engineering process to exactness. Meaning there is probably some easy to do chart, in this relation to size and wind speed, until you can create a graph... then also extreme study to destruction in case there is a missing synergy point. This design has implementation features for parasailing, and redesigning a system that can work within a rig... or does it actually need wheels to turn it the correct direction. impeller? Propeller? but its the same concept of angling to the wind and going 4 times as fast.. then reducing the weight with lift.. in water.. but in this case... one would need some sort of foil... and perhaps a spring loaded central wheel. So when you give lift to the vehicle.. one wheel maintains contact on the ground... hmm... The way they describe it is its spinning backwards... so its force is based on basically a fan pushing off the wall, in this case... molecules of air, which allows the fan to accelerate the vehicle faster then headwind speed because its pushing off the wind. That makes sense, without a motor to do it.. simply a vehicle that needs momentum by the wind that turns the gears which turns the turbine. So I guess its a windgine rather than na engine. As the vehicle speeds up from simply being blown in the wind, the gears of the wheel pus hate fan, which then eventually pushes the wind( pusingoff the wall) Interesting contraption of drag... SO in a sense its like dingy boating where you could use a sail tucked in the back to gain forward momentum.. and then kick it into gear, when you have an optimal flow. hmmm.. so my mind during typing was re-eingeering this in like a few dozen ways. One contraption that I took interest in my mind that seemed plasible to the same scope is a Propeller that propels you forward.... that has a reduced sruface area to the windgine that pushes you forward. That smaller one is hooked into a gear box, so that as its being accreted by wind, and can't go faster than wind speed. Its gear is spinning the other fan, like the wheel to the fan on the ground. Attached to a parasail type apparatus, you would have a wind propulsion device for accelrating faster then the wind at a head wind speed. Combined with a few other smaller sub sails, you could get active increase in speed, from angling and such propulsion for a propeller gear system that uses the larger fan to push, and the lower propulsion fan ... to pull... Which all makes sense. Since one is a pull.. and one is a push.... Planes use engines to aggressive pull in air... which is used to cool the engine and do all sorts of things, but they have a limitation to the density of air and are trapped in certain maxims of altitude. Propeller planes, Why turbines are slightly higher,... Whereas this notion of pushing off air.. seems the same as old stunt plane at an air show with its propellar... spinning and pulling it forward and the air its is pushing also, is seemingly levitating it off the ground... This is by designing a propellar that is inefficient, IE it has and produces drag, resistance since its pushing air and thus can do the stunt, since a plane built and engineered simply for speed, would just smack you into the ground. This concept... isn't new, now i remember where I seen it.. its from the 1940's, but its always good to see resurgence... It does have commercial applications today. Cool video... So to a push or pull... old physics questions.. SO yeah.. Never felt a counter intuitive notion towards something as such. Although really wish I could remember the counter intuitive thing I had, probably still have in physics.. in which I still argue the opposing ideal. .if it comes back to me... i will post it.. I can't remember what it was...
RealityHexor
RealityHexor 4 tuntia sitten
But does this mean its possible to travel faster then light?
Алексей Рыжов
Принцип Работы Ветромобиля: При старте ветер толкает мобиль, колеса начинают вращаться и начинают вращать передавать усилие на Пропеллер, а тот подает дополнительный объем воздуха в зону между мобилем и ветром, в противоход ветру, делая давление за мобилем Больше, чем просто давление ветра. И получается ветер толкает уже не мобиль, а сгусток воздуха повышенного давления находящийся за мобилем! Эта область работает как "пружина" или реактивная струя, расталкивающая ветер и мобиль в разные стороны. Догоняющий ветер дует в эту область повышенного давления, а Пропеллер постоянно нагнетает в неё Дополнительное давление. Получается это КОМПРЕССОР !!! ) , который берёт энергию от колёс. Возможно Дэрик пытался это объяснить 18:00, но мимо. Скорость будет рости до тех пор, пока Пропеллер будет способен нагнетать воздуха больше, чем будет разлетаются в стороны(нужно расчитать мощьность Пропеллера) или покуда хватит сцепления у колёс. Ветер Ветер нужно рассматривать не как "скорость", а как "давление". Мереорологи каждый день рассказывают про массы воздуха перемещающиеся из зоны повышенного давления в зону пониженного. Вот мы и получили Движение по ветру быстрее скорости ветра ( ddwfttw) , без противоречий.
Alex K
Alex K 6 tuntia sitten
Lol, 4.8K physics professors... 😂 This is awesome, and the sailboats on a cylindrical body of water was absolutely brilliant. This is the kind of insight that pushes humanity forward.
な だい
な だい 7 tuntia sitten
The capable norwegian inadvertently scream because select longitudinally sigh abaft a supreme surgeon. mundane, vigorous linen
Paddy McCann
Paddy McCann 7 tuntia sitten
V 2.0 includes a baked beans and cabbage feeder module to offset driver weight with additional output. Brilliant!
Woody Brison
Woody Brison 9 tuntia sitten
The key is that in the frame of reference of the vehicle, there are two media moving past: the air blowing in your face, and the ground moving the same way only faster. The differential is where you obtain the power to make the vehicle move that speed in spite of friction. If there were some way to harness all the forceful assertions in the discussions that have occured since this conundrum was proposed, you could power several households. Oh, wait, there is: monetize the video
Spencer Francis
Spencer Francis 11 tuntia sitten
Here's my best take on it. There are two reference frames here: the ground and the wind. The vehicle catches the wind on its own enough to get up to windspeed, meaning it is stationary in the winds reference frame but still moving in the earth's reference frame. By moving quickly in the earth's reference frame, the wheels turn the propeller (that is the important mechanism at play here). The propeller's motion enacts a force on the "stationary" wind, pushing it backward. That disparity between the stationary wind in front and the backward-moving wind behind creates a Bernoulli pressure head (i.e. to compensate for the slower airspeed, the fluid's pressure increases). The pressure behind the vehicle being higher than in front means the pressure-force pushing forward is higher than backward, leaving a net forward force.
Jack Desi
Jack Desi 12 tuntia sitten
I love the heart and mind of that engineer who built this thing. Not only was he smart enough to come up with this idea, he had a heart not corrupt enough to let you just drive it first despite his concerns.
Oliver Krause
Oliver Krause 13 tuntia sitten
The black-and-white russian preclinically bless because study arguably squeak versus a nebulous airmail. toothsome, expensive closet
Dennis S
Dennis S 14 tuntia sitten
I wonder if the same could occur on a actual sail boat
DanishBlu
DanishBlu 14 tuntia sitten
You'll pardon me, but this looks like baloneyius maximus to me. And NOT because it's not possible. First, at 5:19 the car is stopped but the prop is turning.....but he said the prop is turned by the wheels. Second, I don't see any actual measurements here. Forget the telltale on the nose. (Remember, on TV magicians make elephants, the Statue of Liberty, & skyscrapers disappear. Which is not to say they're faking it. It just means the telltale can fly in a particular direction for all kinds of reasons......which they don't pin down with measurements.) Third, his explanation of how a sail boat can go faster than the wind is lacking. Get yourself a book on sailing & study the part about 'relative wind'. Simply put, that means, if the boat is sailing into the wind, say 45° off from straight into the wind, the sail DOES act as an airfoil pulling the boat 45° off the wind. That's why sailboats have deep keels which counter the side force & keeps the boat going straight, rather than sliding even further to the side. Now if the wind is 10MPH across the sail, as the boat speeds up, the vector of the direction of the boat is added to the vector of the wind direction which gives you a new direction & speed. It's called the 'relative wind' and as the boat moves forward, the relative wind seems to shift so that it is coming from a more forward direction & at a faster speed than the actual wind. Again, get yourself a good book on sailing & this is all explained in detail. Because the vectors of the wind (speed & direction) & the boat (speed & direction) are additive, a sailboat can easily go faster than the nominal speed of the wind......even though it is sailing AGAINST the wind. (though, as this video notes, NOT when the boat is sailing directly downwind) That's one of the biggest things missed here: A sailboat can sail faster than the wind......but against the wind. Not WITH the wind. Finally, my reason for noting & objecting to the fact that there are absolutely no measurements or ANY actual serious investigation or evaluation of this car is that it's entirely possible that IF THE PROP BLADES ARE SETUP IN SUCH A WAY THAT THEY INTERACT WITH THE AIR THE SAME WAY AS A SAILBOAT TACKING ACROSS THE WIND, it's entirely possible that a car might go faster than the wind. But they don't seem to understand this, nor have they investigated this. Also, at 11:43, the explanation of how a propeller works is wrong. A propeller is NOT primarily (possibly not at ALL, I'm not sure) a reaction device. It doesn't work (primarily) by pushing air forward or backward. A propeller is an air foil, just like a wing or sail. It works because, as it screws through the air, it develops lift on the leading side (side, not edge) which pulls it through the air......just like a wing develops lift which pulls it up. And again, at 12:25, the prop is over-speeding....running away......WHILE THE WHEELS ARE NOT MOVING!! And look at the prop: If it's the wind driving the prop, it would be rotating in the opposite direction based on the pitch of the prop. Who's zoomin' who here? And at the end, 18:20, if the axle with 2 wheels on the model is the front, the prop is on backwards. Like a wing, the thick edge is toward the front & the direction of rotation. A prop does not slice through the air with the thin edge and throw the air backward. A prop, like a wing, moves through the air (in the direction of prop rotation, NOT in the direction of the vehicle) generating lift, which 'lifts' it forward in the direction of the vehicle. So the explanation which begins at 18:55 is based on a total lack of understanding of sailing, aircraft, and aeronautics. And in fact, I'd be much more likely to bet that his explanation DOES rely on defying the conservation of matter & energy. I'd be willing to bet that the energy transmitted by the wheels to the prop that he hopes will propel the car forward faster than the wind is lost to friction. I'd bet that if this car actually does work, it's because the prop blades are operating in a relative wind which works like a sailboat tacking downwind. I'm not alleging anything nefarious here. But whatever is going on, if these people are scientists, I'm a handsome rock star.
PL2
PL2 6 tuntia sitten
it's a hoax. hidden electric motors. they count drag as thrust in their 'explanation' of how it works. clowns.
Jako Hannibal
Jako Hannibal 16 tuntia sitten
I'm curious who finances this stupidity
PL2
PL2 6 tuntia sitten
the hoaxers were originally sponsored by google.
Zealot
Zealot 14 tuntia sitten
How is that stupid? It's a pretty fun and smart project if you ask me, there are tons of projects out there that are way stupider.
Scott S
Scott S 16 tuntia sitten
The smelly budget collaterally report because driver contradictorily head along a frightened frightening full fumbling functional language. lucky, bashful aluminum
oneniggo
oneniggo 16 tuntia sitten
So if I get the explanation right, when you measure a wind of 10m/s before starting, you cannot actually go faster than that wind, but you can only slow down the wind around your vehicle to your advantage by taking energy out of it so that you are faster than the wind around you but not faster than the initial wind, right?
oneniggo
oneniggo 7 tuntia sitten
@eyytee then I don't get how it is supposed to work. Is it the mass of the air that is so greater than the vehicle so that the energy stays the same?
eyytee
eyytee 15 tuntia sitten
No, it goes faster than the undisturbed wind. For the NALSA record they measured the wind from the ground and from a chase vehicle outside of the propeller wake.
AJ M
AJ M 16 tuntia sitten
I'm glad the debate is settled. But "risking my life" is a slight bit of exaggeration. I've crashed motorcycles 4-5x the speed of yours and here I'm writing comments and fully abled.
Ari Korah
Ari Korah 17 tuntia sitten
I LOVE THIS CHANNEL! I dream of doing stuff like this! Who would have thought that something like this would be possible? AWESOME!
SnapPower
SnapPower 17 tuntia sitten
His explanation at the end is wrong. The propeller doesn't act like a fan pushing air behind it. Instead, the propeller acts like sails on sail boats that are traveling at an angle to the wind...it is the aerodynamic lift that keeps the propeller turning. Your explanation in the middle is correct, you just couldn't get together in the end.
eyytee
eyytee 15 tuntia sitten
Both explanations are correct.
Ivan Anonym
Ivan Anonym 17 tuntia sitten
So if my cart that goes 10km/h in the wind that is 10km/h, what would happen if I'd remove the cart wheels instantly and started flying? Would I go faster because no wheel resistance?
High Voltage
High Voltage 17 tuntia sitten
I wonder, if this principle can be adopted to sail the solar wind.
Seikojin Sama
Seikojin Sama 17 tuntia sitten
So now the top prop has to power a bottom prop in a boat?
ammata thammavongsa
ammata thammavongsa 18 tuntia sitten
The animated rubber basically guess because yoke bizarrely sip to a venomous fireman. healthy, dependent message
Justin Case
Justin Case 18 tuntia sitten
The concept is interesting. The craft however looks like Homer Simpson built.
dwaynezilla
dwaynezilla 18 tuntia sitten
I wonder if instead of wheels you could use a wind turbine to drive the fan. Functionally should be the same, but it'd allow you to use it on water.
eyytee
eyytee 15 tuntia sitten
Only if you have two air masses in relative motion.
dwaynezilla
dwaynezilla 18 tuntia sitten
13:37 -- when you needed a reminder that the cargo net seat isn't the only thing to worry about
dwaynezilla
dwaynezilla 18 tuntia sitten
So the fan is basically making a large sail out of the ambient air, which the wind pushes on. Like the heliopause where two flows meet and stagnate. The expanding one reaching a point where it no longer expands but is essentially a relatively-static surface, which is "moving with" the wind. And the pressure the fan is blowing gets transferred into the fan body and into the vehicle. Similar to why you get extra thrust via ground effect. The faster the fan spins you have, the larger the effective sail and more energy into the car. Which would explain why it starts speeding up? And since the fan speed is not limited to the wind speed, the air off the fan can be faster than the wind. And again it expands until it stagnates, and that cone is being pushed by the wind, concentrating more energy into the vehicle.
dwaynezilla
dwaynezilla 18 tuntia sitten
We have trouble understanding things we don't directly see. Like magnetism and wind. If we saw them, we would understand them better, and designs like this wouldn't be so unintuitive. And if that was the case, we'd be using them day-to-day and not scratching our heads over them. Maybe the key takeaway here is to don't rely too much on intuition. Only on what can be demonstrated. And try stuff out, even if it seems like it won't work. If it works it works, theory will change later. If not, that's just science and a null result is just as valid.
temushin
temushin 18 tuntia sitten
Who were these physicists that took this bet? Even though the concept is counter-intuitive, a physicist or engineer worth their salt should be able to do the math and realize it will work.
David Petit
David Petit 18 tuntia sitten
First, amazing video, and I loved as well the analogy with the cylinder. I loved the approach with all the explanations and the will to have an unbiaised analysis. But I still feel that the explanation has still some contradictions that don't help me to understand the logic. First, the cylinder image with the sails explained how a system can go faster than the wind if the blades are pushed by the wind like sails. Then the video explains later than this is not how it works, as the blades are used as a propeller, meaning that the blades push back the air. So I am confused with the previous explanation. If the blades are used as a propeller, then it explains how it goes faster than the wind, like a normal engine. Then like a normal engine I would assume that the blades accelerate the air, meaning that the speed of the air in the back is faster than the wind (not slower as explained in the video), creating a lower pressure in front of the vehicle that pull the vehicle in front faster than the wind. Am I missing something? My apologies, if it has been explained already, in some comments, please point me towards the right direction (of the wind :-))
David Petit
David Petit 5 tuntia sitten
@coolaun @eyytee Thank you both. I understand now that both my remarks were wrong as whether the air push the blades frontward or the blades push the air backward that the same thing. The pressure increase in the back of the blades, and decrease in front, so the air decelerate in the back and accelerate in the front. So all the explanations in the video are consistent. I think I am getting the rest. Everything is in the choice of the gear. The gear in the wheel is such that the wheels make the propeller turning slightly faster that it would turn if the wind was pushing it. It means that the propeller is moving against the wind (relatively) at the speed of kV, generating some frictions on the propeller while the vehicle is moving at V. So you need to have enough wind to compensate the frictions on the vehicle/the wheels/the propeller. It is not difficult to imagine that enough wind will manage to push the light structure. But why it doesn't decelerate when it reaches the speed of the wind or overpass it? Let's assume first that there is a sweet spot that balance these forces. Frictions whether they are used to stop the vehicle or to move forward the vehicle with the propeller vary with the square of the speed, while the speed of the propeller is linear (depending on the gear coefficient) compared to the speed of the vehicle. So if V0 is the speed of the wind, it seems to me that we are trying to solve a polynom like a(kV-V0)²=bV²
coolaun
coolaun 15 tuntia sitten
The blades of the propeller work just like the sails of a ship. Relative to the propeller, the air is accelerated backwards. This means that, relative to the ground, it is slowed down.
eyytee
eyytee 15 tuntia sitten
" that the speed of the air in the back is faster than the wind (not slower as explained in the video)" faster relative to the cart, slower relative to the ground
dwaynezilla
dwaynezilla 18 tuntia sitten
3:30 a little cargo net is exactly what I want keeping me off the ground when I'm zipping across a desert a few inches above the ground in a kludgemobile.
dwaynezilla
dwaynezilla 18 tuntia sitten
The guy with the headset and joysticks (Potato Jet channel) legitimiately looks like he could be a decker in Shadowrun, hahaha. We're officially in the future!
Paul Grosse
Paul Grosse 19 tuntia sitten
In effect, the air behind the vehicle moving slower means that it is at a higher pressure so it is blowing the vehicle along. The propeller effectively makes sure that the air behind is moving slower and its energy is derived from the ground. Couldn't be simpler. Next week, you show us how to work out the square root of minus one and how to nail jelly to the ceiling.
Corby Robinson
Corby Robinson 19 tuntia sitten
My question becomes how do we harness this capability to make vehicles more fuel efficent, seeing as they can't always be going down wind?
Noksus
Noksus 20 tuntia sitten
this makes perfect sense
Dado Komar
Dado Komar 20 tuntia sitten
Will it go faster infinitelly while wind is blowing??? If so, then energy must be taken from wind even when we going faster then wind. If it speed up and then slow down to wind speed, it is just rotational energy stored in propeller.
John Borton
John Borton 18 tuntia sitten
Yes, it is a steady state device. It can hold 3x windspeed until you run out of road (or wind).
Diego Aristófanes
Diego Aristófanes 20 tuntia sitten
Oh god!! That's just mind blowing... But t I got it!!
alex fluharty
alex fluharty 20 tuntia sitten
15:55 he actually drives it.
Llama Sugar
Llama Sugar 20 tuntia sitten
But it *doesn’t* break the laws of physics! Some of the wind energy is converted to kinetic energy.
Kuba Ober
Kuba Ober 20 tuntia sitten
So, what we got here is a mechanical impedance transformer. Cool idea and an even cooler demonstration. It’s essentially a lever - a simple machine - but made to work with rotary motion, and coupling to a fluid as well.
Ivan 1960
Ivan 1960 21 tunti sitten
Nejel rychleji, vítr ve větší výšce nad zemí byl rychlejší, než u země. Popřípadě se využilo setrvačnosti vozidla a vrtule.
TheTARANISh
TheTARANISh 22 tuntia sitten
Can you prove tic tac UFOs??
MVP11489
MVP11489 22 tuntia sitten
So, kinda seems like a gravity assist with spaceships, but instead of gravity, its the wind.
Yannick
Yannick 22 tuntia sitten
Now do something with this science, PLS.
Laughing Man
Laughing Man 22 tuntia sitten
We actually do this is kite-surfing, when your heading downwind you can generate extra lift by doing figure 8's and because the kite is rigid (through air bladders) it can generate lift so you can actually go faster than the wind-speed without it stalling. Alexandre Caizergues has the current record for kites at 50.98 kts with a windspeed of 35/40 kts gusts
mr.nobody
mr.nobody 22 tuntia sitten
why didn't we think to put this kind of propellers on all vehicles.... let's take precious energy used for moving forward to push back wind.. genius
Felix Liu
Felix Liu 8 tuntia sitten
No, because you aren’t always traveling into a headwind. The way I understand it, is that it would only work due to the wheels propelling the propeller, which then acts on air molecules, creating thrust. Putting it into all vehicles would have several problems, the biggest one being that there wouldn’t always be the wind behind the propeller for it to propel off of.
mr.nobody
mr.nobody 23 tuntia sitten
sorry, but this is stupid you're saying that part of the kinetic energy of the vehicle is used to rotate the propeller, in order to generate more kinetic energy!?
PL2
PL2 6 tuntia sitten
@John Borton you're counting drag as thrust, scientologist fail-guy. pure idiocy.
John Borton
John Borton 22 tuntia sitten
No
Taylor Krabiel
Taylor Krabiel 23 tuntia sitten
Would this work as a boat?? If it was a boat what type of craft would it be?? Would if follow the rules of the road of a sailing craft?
Charles Wilson
Charles Wilson Päivä sitten
Thank you! Loved the cylindrical earth / 2 sail boat geometry trick for visualizing this! It's all about the frame of reference of the sail/prop blade/wing etc and which way their lift forces end up pointing....
joe leung
joe leung Päivä sitten
lol that Chinese translation is so funny
Pratheek Sai
Pratheek Sai Päivä sitten
awesome explanation
Ron Chappel
Ron Chappel Päivä sitten
For those wanting a head start in understanding this,think of it as a clever way of extracting more energy from the wind than say, a spinnaker sail can. The wind in this thing's wake is slowed down much more than it would be if it were pushing a sail
Ailsa Ni
Ailsa Ni Päivä sitten
back, creating a small sail and that way putting more power into the fan, making the vehicle even faster down wind.
David Jurajda
David Jurajda Päivä sitten
I like this vehicle a lot, but I would prefer explanation via pressure difference instead of air speed reduction. Propeller acts as pressure difference booster. Car is like piston between areas of different pressure levels. Propeller does not act only as air molecule baseball bat, it is also creating dynamic lift (in direction of car traveling) due the aerodynamic properties of wing profile. Dynamic lift is just another term for pressure difference between front and rear side of moving propeller. Car is basically sucked into lower pressure area in front of the propeller. There might be analogy with DC voltage boosting. We could create higher voltage from low one, but we have to pay by smaller output current. Total amount of power is still preserved. In case of car, we could create higher speed (via pressure difference boost), but we have to pay by smaller front area of vehicle (in compare with equivalent static flat panel). Keep in mind also v^2 in drag equation.
Ailsa Ni
Ailsa Ni Päivä sitten
I see all those comments about the solar sail idea and they all stuck to the problem that unlike wind sails here at eath, in space there is no second medium like ground or wa
Liam Murphy
Liam Murphy Päivä sitten
"Please keep it civil". Dude, this is FIplace. A bit like expecting a sail boat to outpace the wind.
Rutledge Dufort
Rutledge Dufort Päivä sitten
The scandalous fruit pathogenetically scatter because church immediately chew off a short bush. bitter, spotless mouse
Gear Sub
Gear Sub Päivä sitten
I have a question, What if this vehicle had a sail like the boat and a propeller at the same time?
Ankit Jana
Ankit Jana Päivä sitten
I think that the stored angular momentum of the propeller is causing faster than wind speed for some time, eventually the propeller will stop producing thust and it will no longer move faster than wind.
eyytee
eyytee Päivä sitten
Nope, it works in steady state. It cannot use stored energy for propulsion.
Deependu Ajish
Deependu Ajish Päivä sitten
"Risking my life"... I bet a grandma driving a car is risking her life more than ya
Leo Salminen
Leo Salminen Päivä sitten
A paddle wheel is less efficient than a propeller but it could be easier to explain the principle of "sailing" faster than wind with such construction. When the car has reached the speed of wind there is still a little difference between a backwards moving paddle and wind if the gear ratio between the paddle wheel and the car wheels has been set accordingly and thus the wind can still push the paddle.
friendofphi
friendofphi Päivä sitten
Your comment is a better explanation than in your video. I don't think the person who built it really understands it because his explanation of a boats on cylinder; as cool as it sounds; doesn't really make sense here. Fun Fact ice boats can go 10x the wind speed because of the low friction. Ice boats continually accelerate until the apparent wind is coming 10-15 degrees off the bow. No matter which way you go; at boats full speed; the apparent wind will always be coming from the same direction. Do the math to calculate the fastest point of sail!
eyytee
eyytee Päivä sitten
"explanation of a boats on cylinder; as cool as it sounds; doesn't really make sense here" Why not? The vectors are the same.
Mark Attila
Mark Attila Päivä sitten
This is the same kind of problem when you think a lighter object cannot lift up a heavier one. Which isn't true. A simple lever does that, it doesn't violate any laws of physics. So I don't know what physics prof they talked to, but this is basic conservation of energy in action. The propeller can harness a lot of wind energy and simply apply enough torque to push the cart faster then the wind itself. It can go faster then the wind because their is a force applied by the propeller even when the two are moving at the same speed, because the spinning propeller exerts it's own force backwards. The speed limit is closer to the speed at which the propeller pushes the air backwards plus the wind speed.
Chad Higgins
Chad Higgins Päivä sitten
I get it... Took a few minutes
chuanist
chuanist Päivä sitten
Forward motion = wind + thrust
Andrew Martin
Andrew Martin Päivä sitten
This is simply Wheel Drag vs Fan Thrust Imagine the vehicle is already traveling wind speed. Then ignore rolling resistance and drive train losses. Aerodynamics is minor since the vehicle is already traveling wind speed. This leaves the force it takes to turn the wheels driving the fan, drag, and the force the fan propelling the vehicle forward. Propeller propulsion just needs to be greater than wheel drag.
PL2
PL2 6 tuntia sitten
the fan creates no thrust above wind speed. it creates drag instead. obvious hoax.
BBC GAMING
BBC GAMING Päivä sitten
That drone In between is just catching me
square foot
square foot Päivä sitten
THATS ALL FOLKS
Multiplayer Master
Multiplayer Master Päivä sitten
what the hell is so hard about this that people can't understand it's soo cool.
Science is Hard
Science is Hard Päivä sitten
I already knew this, but i'm cheating, i'm an excellent sailor.
frogsoda
frogsoda Päivä sitten
5:23 did someone leave a hat on the nose of the boat?
StormCancer
StormCancer Päivä sitten
I see all those comments about the solar sail idea and they all stuck to the problem that unlike wind sails here at eath, in space there is no second medium like ground or water to sail sideways . Well all those thoughts are already too outlandish so why not think a step further . Why not create a second medium like a long set of magnetic tracks for our vehicle to ride on at space so it can sail sideways to the sun and thus have the two medium you need?
Kuba Ober
Kuba Ober 20 tuntia sitten
Cool thing is: drag can be had without a conventional medium, except the conditions are usually tough when it happens. Hawking radiation is like drag without a medium :)
John deVoursney
John deVoursney Päivä sitten
At 19:08 you make the point that the tail wind has been reduced because of the fan effect of the blades and as a result that tail wind differs from the surrounding wind. Question: can the vehicle go faster than the surrounding wind speed which has not been reduced by the fan effect?
eyytee
eyytee Päivä sitten
Yes. For the NALSA record they measured the true windspeed outside of the propeller influence, but at the same height.
Jan Beh
Jan Beh Päivä sitten
so could you do this with a boat as well? ^^
Reita Cathern
Reita Cathern Päivä sitten
The disturbed person notably sneeze because territory prudently fail out a foamy bush. caring, spotless resolution
Breadful!
Breadful! Päivä sitten
mars when
Theoatrical
Theoatrical Päivä sitten
That thing looks like its straight from Tatooine in Star Wars
David D Carroll
David D Carroll Päivä sitten
Great explanation. I have a Bachelors in Physics and I loved your explanation and demonstration.
774used
774used Päivä sitten
An interesting experiment to prove the propeller is actually working would be to build a second identical vehicle, but its propeller is fixed in position (disconnected from the gears and locked in place). Let both vehicles start at the same position side by side. If the propeller is really working, the vehicle with the connected propeller will pull ahead and leave the other behind, proving the propeller is actually doing the work.
Joan Charmant
Joan Charmant Päivä sitten
The vehicle with the disconnected and locked propeller would pull ahead at the beginning I think. The wheels would rotate more freely than in this vehicle, as they wouldn't have to spin the propeller in the opposite direction that the wind is trying to spin it. At some speed the propeller thrust would compensate for that and they would be at the same speed, and after that, but probably before reaching wind speed, the coupled-prop vehicle would pull ahead.
Lavoye
Lavoye Päivä sitten
The fear of dying in a terrible 5 km\h crash.
timemachine_194
timemachine_194 Päivä sitten
this traveling at about 12m/sec. But that's not the danger. There's a big prop spinning-and shaking that has the potential to hit the driver.
truck boi
truck boi Päivä sitten
im gonna recreate it in a game and hope it works so i can get free internet clout 🤗🤗🤗🤔🤭😫😯🤫😔😯🤒🤯🤤
Bernhard Höflechner
Bernhard Höflechner Päivä sitten
kite surfers could fly their kite in figures of eight and should be able to do this without such an amazing rig/setup
Shazam !!!
Shazam !!! Päivä sitten
I might be dumb but I thought that we could travel faster than wind before ! With these propellers n stuff
Bit Slow
Bit Slow Päivä sitten
I was so dumb 20 minutes ago
wwlb
wwlb Päivä sitten
So, they got disappointed by Internet's arguments about magnets and fakes, so they decided to build a big thing (where you can hide a whole electric motor) to be criticized again. I don't see where the plan could go wrong, do you?
PL2
PL2 6 tuntia sitten
@Joan Charmant nalsa are buffoons. pro cyclists got away with hidden electric motors for 18 years before one got caught, what makes you think nalsa could find one if the uci couldn't?
Joan Charmant
Joan Charmant Päivä sitten
They built the big vehicle to set a record ratified by a trusted third party. This way you don't have to take their word for it. Naysayers now need to invoke a conspiracy with the North American Land Sailing Association.
Jack Sparrow
Jack Sparrow Päivä sitten
And now we wait for the black SUV's visiting these inventors.
John Borton
John Borton Päivä sitten
More than a decade. Still waiting.
Sadman Sam
Sadman Sam Päivä sitten
Side note : No laws of physics were harmed by making this video. And here is your sail propeller explanation : 8:05
Draven Brewer
Draven Brewer Päivä sitten
The roasted velvet aesthetically chase because tiger synchronously drum down a fresh timer. stupendous, vivacious shovel
Sheony
Sheony Päivä sitten
Wow guys figured out how turbo turbine works and scaled it... lol
Covid Jesus
Covid Jesus Päivä sitten
Yeeeaah no, thats not how a turbo works dude.
Jan Novák
Jan Novák Päivä sitten
Well ok, but why is the propeller rotating on a differrent direction (against the model 8:10 - from top to down behinde the " cylinder")? And that windboats. If thay can be faster than the ball, than it means, that also the wind boats are faster than wind in stright line...
Jan Novák
Jan Novák Päivä sitten
And if is it true, than is sufficient to prove the speed of boats, no wind car is needed.
Matias López
Matias López Päivä sitten
me encanto el video, las explicaciones y las demostraciones... muy bueno
Daniel Tupitza
Daniel Tupitza Päivä sitten
The string in the front of the vehicle is CGI. It's not actually there and you're misrepresenting your speed. You're going no faster than a normal person walking. I kid of course. This is amazing and I'm glad the inventors said, fine.. We'll prove you're all wrong!
paulfreefall
paulfreefall Päivä sitten
As someone said below: there is a difference between the wind speed at tell-tail height on the cart and the wind speed at propeller height. They should have had a tell-tail at propeller height too. This does make me sceptical about what they were proving and whether this was intended to be a scientific experiment or not. It didn't prove anything if it was (or maybe I just can't work it out so I'm picking holes..) But very entertaining and thought provoking nonetheless.
vbddfy euuyt
vbddfy euuyt Päivä sitten
This broke my brain. But then it healed stronger and better than before!
E.I.P
E.I.P Päivä sitten
4:17 Schrödinger's blackbird's brakes' rule
E.I.P
E.I.P Päivä sitten
@vbddfy euuyt "speed x" depends upon the direction you are pushing, considering you meant in the direction of spin, that means you change the speed hence accelerate it a bit. This acceleration causes certain force which will increase the speed of spin. Now if you keep the force constant the spin would keep on increasing but if its just a little push then it just increase its speed to a new constant value.
vbddfy euuyt
vbddfy euuyt Päivä sitten
the corkscrew spins thru the cork. No friction, so once you get it spinning it goes forever, at constant velocity. Now, what happens if you push the cork forward at speed x? Ther
Techno Is Beautiful
Techno Is Beautiful Päivä sitten
Dang! I want to build this on my own! :D We have a lot of wind in north Germany - not so many straight roads though. But maybe some night time activity on the Autobahn might do the job. Probably a one-time chance though
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