Risking My Life To Settle A Physics Debate
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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 SVsoft 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: svsoft.infof... .

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

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References
Jack Goodman's SVsoft 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

Kommentarer
  • Veritasium
    Veritasium

    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

      I'm mind blown

    • Rick Cavallaro
      Rick Cavallaro

      @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

      @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

      @Fred Meister look up mechanical doping in cycle racing then tell me he checked properly, science-hating crackpot.

    • Joeri sol
      Joeri sol

      It still does not explain why the speed of the prop is accelerating instead of decelerating when the vehicle is slowed down.

  • T K
    T K

    So what i see, the propeller works first as a sail and the force it produces go over the tires and a transmission with a ratio that alows the blades to turn against the wind?! So the the propeller moves against the wind with the force of the wind. Maybe a variable transmission with the pitchcontroll together and all controlled by electronic can be the next step to push this project. And a new vehicle ;-)

  • Matthew Dresser
    Matthew Dresser

    This is cool and really interesting, but it's a shame you don't mention that this thing can also sail directly upwind as well (maybe it needs a change of gearing, but this was done with a sailboat many years ago)

  • Dar “BeastMastre” Dudley
    Dar “BeastMastre” Dudley

    So, it's like a reverse Alcubierre warp drive. Think about it.

  • Robot Disgrace
    Robot Disgrace

    You're really short

  • Jai King
    Jai King

    I want to drive this. Ill even help design a prop that will gather more wind and project the vortices in such a way that they will increase thrust coming off the tips of the blades, Rather than create mechanical drag. I want to see how fast we can get this vehicle to move under the sheer force of wind. Perhaps there could even be a push-pull method to this that could possibly achieve even higher speeds. Such as 120mph on a 20 knot wind. In theory it should work but without testing this will simply stay an idea in my head as I don't have the funding nor the ability to gain enough capital to design such a craft. Or transport said craft to sites in which it can be tested thoroughly.

  • bikerdude923
    bikerdude923

    I enjoy all the comments about how physicists/scientists won't believe anything unless they can see the math for why it works, this may be true for some scientists, but anyone who works in a research lab (like I do) could tell you that many scientists are perfectly willing to say "hell if I know how it works, but let's try and figure it out".

  • dbr opx
    dbr opx

    13:38 if you listen closely you can hear everyone vacuum seal themselves to their seats 8.5/10 on my pucker factor

  • guits
    guits

    Ahem... Kitesurfing. When you want to go downwind as fast as possible you do kiteloops. It generates more lift by flying the kite forward and since it's turning in circles you can keep it continuous. The kite itself pretty much is a wing itself and since the lift is pointed downwind I'm pretty sure you can go faster than the wind. Pretty sure because I haven't measured it but I think it should work. So basically the sail is moving in a cylindrical path but I'm moving straight down wind.

  • Ioannis Konstantinidis
    Ioannis Konstantinidis

    I am not pushing back with this comment, I am just wondering... 1) It looks very easy how the wind can pick the whole thing up and get it to move in the first place. It looks heavy (including the pilot) and it's quite aerodynamic. How does it even start moving? What do you think about the cogwheel that connects the wheels with the propeller? How many rotations of the wheels are required for a full rotation of the propeller? I think that is more important than the whole propeller working like a fan.

  • serialnumber10 belly flop
    serialnumber10 belly flop

    If it slows down the air behind the blade then it will equaly accelerate the air in front so it evens out. What i think it does is : energy is stored in the blade as rotation cinetic energy and is given to the cart when terminal speed is reached

  • Jonathan Jollimore
    Jonathan Jollimore

    COME ON! Someone give me a rocket car to drive on salt flats!!

  • Daniel
    Daniel

    Perpetual motion isn't possible! End of the debate

    • eyytee
      eyytee

      That wasn't the question tough.

  • Michele Balsamo
    Michele Balsamo

    I'm an environmental (but not mechanical or aerospace) engineer, but more of this I'm a very curious person... I saw your interesting video and I would know if it could be possible to have a technical drawing (can you ask to the designer Cavallaro?) of the propeller/fan and in particular of its blades, probably the solution of this "wrangle" (I read that there was some of people that have not agreed with the results of this video) is in it. If the "propeller" is not a real propeller but it works like a fan and so the velocity of the air v* in the rear of the machine is less than the main velocity of the wind V then there will be an overpressure zone in the rear of the machine, overpressure on a surface became a force or thrust... I hope you will have the possibility to answer me (ingmbalsamo"at"gmail"dot"com), and anyway I want to thank you for your interesting videos (this one but more of this the one about the Logistic Map). Best Regards

    • eyytee
      eyytee

      propeller = fan, it speeds up the air in the cart frame, but slows down the air in the ground frame.

  • The Story Police
    The Story Police

    We can make a religion out of this...

  • Khurshed Fitter
    Khurshed Fitter

    Americans summed up. They do not know what will stop the vehicle xD

  • Husain Jawahar
    Husain Jawahar

    I understood this concept but isn't it seems like perpetual motion. the faster the wheels rotate, faster the prop rotates, and the more air it pushes, and so it goes faster, and so faster the wheels rotate... and so on. this can make it go to infite speed.

  • Lonsad Dessor
    Lonsad Dessor

    In front of the propeller, the wind speed is greater than behind the propeller, and it turns out that, according to Bernoulli, the air pressure is less in front of the propeller, and behind it is more, so the machine is driving due to the pressure difference. Or is it wrong?

  • Dana B
    Dana B

    So now that we know it can be done, what can we do with it? Propellers on boats?

  • marc prezeau
    marc prezeau

    The wind indicator pointing backwards does not mean the vehicle is going faster than the wind

    • eyytee
      eyytee

      @marc prezeau "such a tiny difference in speed" They went 27.7 mph in a 10 mph wind. And NALSA used precise GPS, not a smartphone. Read the technical NALSA docs,

    • John Borton
      John Borton

      @marc prezeau Like I said ... you have no idea as to the GPS setup that was used. LOL

    • marc prezeau
      marc prezeau

      @John Borton Gps are notorious for being meters off on a good day and now they are trying to point out such a tiny difference in speed. That tail pointing back says nothing put a plain sail board beside that contraption and watch as the sail board leaves it in the dust I would argue that that the prop and the gears actually slow it down.

    • John Borton
      John Borton

      @marc prezeau You have no idea as to the GPS setups that were used ... nor the high end anemometers. :)

    • marc prezeau
      marc prezeau

      @eyytee using a gps as a speedometer is not very accurate ditto for the walmart anemometer. the wheels spin the prop the gear ratio is just enough to create a bit of turbulence to make the tail point back towards the prop.

  • Fola Dodo
    Fola Dodo

    I really want to learn physics but I am afraid I won't understand ;-;

  • zuikatsu
    zuikatsu

    Just wanted to say huge props (hah) to the drone operator, beautiful shots from that tiny little thing

  • Mohesh Gupta
    Mohesh Gupta

    ok so can we generate infinite energy from it if this all working exactly fine. wouldnt this be the end of energy crisis......

  • Jessica Evans
    Jessica Evans

    How is he "Risking his Life To Settle A Physics Debate?" xD this is bot risking your life

  • Adrian Z.
    Adrian Z.

    Based on the motion of the blades, they indeed push the air backward. As you explained you should experience a propulsion from this motion, but I also believe you should have a difference in air pressure at the front of the blades, allowing the fan to be sucked forward, and increasing your speed further. I might be wrong, as it is an area of physics that twist my mind a bit…. NOTE: Rick and Neil really need to use 3 or 4 blades to stabilise the fan while it is spinning. Centrifuges spin AT LEAST with 3 arms for that reason 😊 engineers can chose other materials to balance the increase in weight of the overall structure if necessary.

  • Bob Roberts (Down2TheC)
    Bob Roberts (Down2TheC)

    Only wind relative to the sail surface is important. Multihull Americas Cup hydrofoil boats are exceeding wind speed down wind. Once on the foils, low drag, high speed, and as you turn down wind(ish) the sail has relative wind toward front despite true wind behind. Crazy to see them going 30kts in 12kts wind.

  • soiung toiue
    soiung toiue

    Clowning on physics professors isn't an achievement you get everyday

  • FlatWorldJomhuriRegime88
    FlatWorldJomhuriRegime88

    Clearly there’s an electric motor in it

    • soiung toiue
      soiung toiue

      If they would've did something like this in HS I would've liked physics more 😂

  • HyShade
    HyShade

    Tier 2 of this tech tree: FTL travel.

  • tomehost
    tomehost

    He lost all the flat earthers at the point he had sailing boats on a cylinder.

  • な だい
    な だい

    The auspicious editor bailly fear because knee steadily desert alongside a harmonious deficit. trite, military armchair

  • Aldien Wannuga
    Aldien Wannuga

    is there a way my pants blown faster than my fart exit from my butt?

  • airtadeo
    airtadeo

    I want to Help. I have an idea to progress the acceleration.

  • imd12c4advice
    imd12c4advice

    At 8:30 the simulation shows the wrong propeller rotation for forward travel. And also a backwards propeller to boot.

  • Ch Lope
    Ch Lope

    Everyone has misunderstood what is really happening here. This wouldn’t work if the earth was flat but because it is curved once you move off the top peak of the curve it is all down hill. This allows you to keep accelerating until you reach the South Pole. Simple and in line with the laws of physics.

  • Mirage
    Mirage

    Well its not quite perpetual motion, cause you pull energy from wind

  • Cosmic Morning
    Cosmic Morning

    Could there be a way to apply this to gravity / space travel to go further then the speed of light or is it potatoes and tomatoes?

  • Chris Carter
    Chris Carter

    Yesterday I posted an answer on Quora to the question: "Could a sailing boat outrun a balloon?" My Answer was, in general NO, and postulated an unlikely situation in which it could happen. I will now have to Eat My Words and humbly admit that I have seen it with my own eyes. It is not a boat but it IS a wind-powered vehicle. You, Sir, are a genius! (Now to figure out how it works...)

    • Bill Carr
      Bill Carr

      Check out the latest New Zealand America's Cup boats. These boats regularly out run the wind, just not directly downwind.

  • Setsura- sama
    Setsura- sama

    I love your explanations, as they’re just dumbed down enough that mostly everyone understood. Though it’s intellectual enough that the more intelligent people don’t feel patronized. That being said, I thought it was like the one myth busters episode. Where they tested if you walked or ran in the rain. Which one would get you more wet. Where running actually got you more wet. As you’re running into more rain than you would be if you walked. As only so much rain (wind in this case) can impact you in that area. So once you meet the speed of the wind. The same amount is hitting you repeatedly, though if you take the cross wind. You get more as you’re entering a new area for it to impart some energy into.

  • saket vatsa
    saket vatsa

    Never do I write YT comments. But this blew mew more than any other video out there. Love your work. It never ceases to amaze me :)

  • Ankit Kumar
    Ankit Kumar

    Maybe propeller is on height which make drive faster than the string attached to bottom because wind is faster when the height increases or may be momentum get added up

  • Nathan
    Nathan

    I wish I could meet you just because the knowledge I would gain in that short amount of time would be amazing. Thanks so much for this video!

  • David Woodside (Wiseacre Dave)
    David Woodside (Wiseacre Dave)

    I thought of a 3-part brain teaser based on the downwind cart. Maybe it's trivial and flawed, but it makes you think about the interactions of the cart with the wind. Mount a mechanical anemometer at the top of the cart. a) When the cart is moving relative to the ground at wind speed, what would the anemometer read? b) When the cart is moving relative to the ground at wind speed, is the true wind (the wind from the atmosphere) still pushing on the anemometer? c) Now place the anemometer on the cart so it can only measure the true wind. Place a second anemometer on the cart so it can only measure the relative wind. With the cart moving at wind speed across the ground, what would be the sum of the speeds measured by the two anemometers, ignoring energy losses?

  • J Morris
    J Morris

    If they would've did something like this in HS I would've liked physics more 😂

  • Sheldon Custer
    Sheldon Custer

    Sort of like drafting in motorcycle racing. Another idea would be to consider a shroud for the fan to increase efficiency.

  • Winston (0090)
    Winston (0090)

    In theory would it be possible to ride it against the wind?

  • Kenneth Hoadley
    Kenneth Hoadley

    I have watched the video and read read lots of these comments - some very instructive. My first thoughts were... this is impossible... can't get something for nothing! Who needs an engine if you can go faster than the wind! Of course it is possible the vehicle has a hidden power source but I'm assuming not. At the start, when the vehicle is a rest, it is blown by the tail wind (say 10kt). The cart and prop are acting as a sail. The drive is disengaged so there is no backward force from the prop to wheels. One comment said why not use a sail! It could be thrown overboard once the cart is moving at a certain speed but I don't like the comparisons to a sail boat. The wind can accelerate the vehicle to a maximum speed of (almost) wind-speed. Then if we engage the prop - this will certainly brake the wheels and thus slow the vehicle. Then wind tries to accelerate the vehicle back up to wind-speed. Meanwhile, the prop is pushing air backwards (say 2kt relative to the prop). So the wind-speed at the prop (relative to the ground) is now 8kt... so the wind can give us 2kt more up to 12kt. Then we are in a positive feedback loop until losses (drag/friction) balance gains. Is this how it works?

  • Sheldon Custer
    Sheldon Custer

    They should add variable sails to the sides of the prop tower that can be deployed at the start, then drawn as the vehicle speeds up.

  • Shrawan Dhawale
    Shrawan Dhawale

    by the way does he use any fule well if he doent then we have infinte enrgy broooooo

    • J Modified
      J Modified

      Yeah, sailboats are fake - they all have hidden motors.

  • Lavonia Lauri
    Lavonia Lauri

    The squealing consonant arguably inject because mouth secondly wriggle worth a sassy cooking. ordinary, permissible seaplane

  • Subtle Entity
    Subtle Entity

    He's got no shades!!

  • MrRickkramer
    MrRickkramer

    What’s the theoretical maximum ratio between wind speed and vehicle speed? Is there a way to calculate? Is it 3.14159....?

    • eyytee
      eyytee

      max_speed = wind_speed / (1 - efficiency)

  • Tom Grüber
    Tom Grüber

    what about a transmission?

  • Jan Klas
    Jan Klas

    So, you had a nice downhill drive :)

    • John Borton
      John Borton

      @Jan Klas // "Dear John.. I'd advise you go google on 'emoticons, what do they mean and what are they used for'."// // "Usually people who feel the urge to advice someone, have some kind of authority. Usually. Not always. QED."// I'm glad you finally solved your problem and figured out the futility of your actions. Dumbass.

    • Jan Klas
      Jan Klas

      @John Borton Usually people who feel the urge to advice someone, have some kind of authority. Usually. Not always. QED. If you were to stupid to understand my remark was a joke (the smiley might have given that away, one would say) you're not going to understand anything. Good luck with that.

    • John Borton
      John Borton

      @Jan Klas I'd advise you Google the word "context", but given the exchange so far (especially given that a smiley face emoticon doesn't mean sarcastic humor) I doubt you would be capable of learning from it so I'll just give you a pass.

    • Jan Klas
      Jan Klas

      @John Borton Dear John.. I'd advise you go google on 'emoticons, what do they mean and what are they used for'. You might learn something today.

    • John Borton
      John Borton

      @Jan Klas I see you have no ability to recognize when your 'sarcastic humor' might get muted beyond recognition by thousands of other criticisms.

  • Sir Zechs
    Sir Zechs

    Clowning on physics professors isn't an achievement you get everyday

  • Marc Verderi
    Marc Verderi

    I'm getting a non-stop headache since I've seen this video... ;)

  • Dane Beck
    Dane Beck

    Demonstrating that they're going faster than the wind by itself isn't enough to prove their theory. For example, they could get up to speed and build momentum, then the wind could slow down without necessarily changing direction, which would result in them going faster than the wind and be consistent with their observations. To truly prove this is working they need to verify that the vehicle is continuing to accelerate while going faster than the wind. How do they know the vehicle wasn't decelerating when the streamer was pointing in the opposite direction?

  • Annabelle Annabelle
    Annabelle Annabelle

    The ripe waterfall lastly rot because mine inadvertently spell under a like creek. guarded, mundane algeria

  • A C
    A C

    Wacky Races

  • Rodolfo Padilla Ruiz
    Rodolfo Padilla Ruiz

    I am not a physicist, but if you add gearbox, doesn't that make the blades spin even faster for the same push force?

  • Katherine Montgomery
    Katherine Montgomery

    The shaggy position relatively multiply because message happily question in a stiff airplane. lonely, demonic archer

  • InfoRazor
    InfoRazor

    I would like to suggest a different explaination. Imagine a different car. In which, large turbine is generating electricity from wind power. This electricity is charging an electric battary. And when the driver descides to move, the energy is activating an electric motor, that pushes the vehicle faster than the wind that charged it. This is trivial. I suggest that the vehicle in the video may not have a battery yet does have a way to store wind power. It does it by keeping the energy in the turbine rotation. The way i consider it goes like this: 1) the vehicle is slowly pushed by the wind. Much of the energy is used to "charge" up the turbine. 2) at some point the vehicle gets to wind speed. However at this point the rotation battary is fully charged and its energy is used to push the vehicle forward. 3) since the wind speed is constant, the extra energy from the turbine rotation would push the vehicle above wind speed. Am I wrong?

    • Rick Cavallaro
      Rick Cavallaro

      >> Am I wrong? Yes. For our record run in 2010 we had to demonstrate that we could not benefit from stored energy.

  • Matt Brewer
    Matt Brewer

    8:05 oh god dont give the flat earth guys any ideas

  • Johnny Thousand
    Johnny Thousand

    TLD;DR Derek went into the desert and broke wind

  • Steve Brady
    Steve Brady

    This broke my brain. But then it healed stronger and better than before!

    • 12ken
      12ken

      No pain no gain!

  • Senor Misterioso
    Senor Misterioso

    Pretty straightforward example of mechanical advantage. The significant mass of the air moving against the vanes of the impeller combined with the gearing of the cart allows for transfer of the kinetic energy of the moving air (wind) to be translated into a low mass vehicle that is easily effected by this acceleration. Once the mass of the vehicle increases, the demand required of the wind to accelerate the vehicle even with mechanical advantage will be too great outside of gale force winds. Will this vehicle accelerate forever? Of course not. It's merely a product of the force of the wind times the mechanical advantage of the machine minus the resistance of the wheels and the drag of the air. Why is this confusing? Ill put $10k on it.

    • Adam Hulu
      Adam Hulu

      Your explanation sounds more like a wind powered tractor pull when you talk of mechanical advantage. To really understand what is going on, you would get closer to the main idea by comparing it to an ice skater propelling forward by alternately pushing apart then pulling in their legs.

  • Only 1%
    Only 1%

    Better than mythbusters

  • Ian Olson
    Ian Olson

    8:05 this man just ravaged my round-earth sensibilities

  • EJoey2006
    EJoey2006

    This video makes me glad that I subscribed last week.

  • Shubham Machhi
    Shubham Machhi

    There’s gotta be a motor or something in there

  • zaphr89
    zaphr89

    Sounds almost analogous to a Warp drive (except hear the wind velocity field is being "stretched" and "contracted" rather than spacetime), a wind warp drive! xD

  • Mark Poidvin
    Mark Poidvin

    Very impressive and congrats to the inventor. However, if we start getting cylindrical earthers, he's getting a knuckle sandwich.

    • Marko B
      Marko B

      Grow up.

  • El Morto Beats
    El Morto Beats

    kiwico toys seems perfect for todays kids! wish i had those toys in my childhood

  • aformalevent
    aformalevent

    nailed it

  • Neal Sullivan
    Neal Sullivan

    So could it be possible to do the same type of gear system to a boat propeller and beat the wind speed down wind on a boat

  • mmpj twod
    mmpj twod

    His cylindrical earth explanation blew my mind. This is genius!

  • Elliott C (3lliottC)
    Elliott C (3lliottC)

    I’ve always wondered if you could just leave an autonomous plane in a jet stream. Why couldn’t a glider sit there forever maybe as a downlink for something.

    • imd12c4advice
      imd12c4advice

      You would at least need an updraft that is greater than or equal to the sink rate. Then you could use a turbine to power whatever systems you like.

    • mmpj twod
      mmpj twod

      not fair, behind the solar wind from sunset pushed more )))))))

  • Ryan Khansary
    Ryan Khansary

    The null heaven impressively mess up because camera immunochemically spark against a old look. thankful, marvelous voice

  • Mark Tucker
    Mark Tucker

    Brilliant, would probably work with solar winds too.

  • Infinite Gold
    Infinite Gold

    Oh my god this comment section is filled with NERDS

  • RiceBoy
    RiceBoy

    gmod irl

  • Yo Vino
    Yo Vino

    It happens.

  • Kylynn Boi
    Kylynn Boi

    What if this was a impeller instead of a propeller.

  • sledzilla
    sledzilla

    I liked how this video presented the premise and step by step explained how the hypothesis came about and explained it in an understandable way. Not having sailed before, I didn't know exactly how tacking into the wind worked to increase the speed but I understand the concept of propellers and wings. Illustrating the concept step by step is great. I can understand taking a flat surface and making it into a tube, then adding a boat 180 out of sync ( kind of like how a/c voltages 180 degrees out of sync will cancel each other out but when synchronized will double the input ). Its an Ah-ha moment. It flies in the face of physics as we are taught, but every concept we take for granted at one time was considered wrong, against science as we know it. There maybe thousands of theory's in physics that are considered impossible, but sometimes the impossible just means that the method of proving an exact principle hasn't been discovered yet. Virtually everything we use today would have been thought impossible by the best scientists 500 years ago. Go back to the 60's and imagine the writers of Star Trek. They wrote of devices that couldn't possibly exist then but are disposable commodities today. Cell Phones ( communicators ), Medical Instruments, Phasers and Photon torpedo's ( Laser beam weapons ). Our cell phones have more computing power than anything they could have imagined and we think nothing of throwing them away. So to sum it up, the impossible is only that way until someone figures out how to make it possible. If made possible, it may not be practical for real world use, but in the future.....

  • Wise Fool
    Wise Fool

    Surely the wind speed at the top of the propellor is far greater than the wind speed at the tell tale. Would a tell tale at the centre of the prop still stream back? They surely should have put some velocity sensors and anemometers on at various points to give more concrete evidence. Or at least more tell tales at various points. There are more ways to get a tell tale to stream back too such as stall. I didn't watch this trying to be skeptical or suggest that it is impossible (sailboats go way faster than the wind without defying physics, I assumed at first the propellor could use the backwards flowing apparent wind to drive the craft forward somehow but that doesn't seem to be what is stated) but it would seem fairly easy to give lots of evidence to prove without doubt that it went faster than the wind. Evidence that seems to be lacking. Maybe they can still get this data.

    • eyytee
      eyytee

      The measurements were already done by NALSA, including windspeed at propeller height. Google: NALSA downwind record

  • AAE
    AAE

    Saying 'tacking' downwind is triggering me, it's gybing downwind, tacking upwind. This was extremely impressive none the less. I'm still struggling.

    • Rick Cavallaro
      Rick Cavallaro

      @AAE a tack and a jibe are maneuvers. Tacking however, also refers to the act of taking a zig-zag path to get to a destination - whether that destination is upstream or downstream.

    • AAE
      AAE

      @John Borton haha yeah but I sail f18s and we're always going 'upwind', you still reference true wind angle in regards to sailing point (reach, broad reach etc)

    • John Borton
      John Borton

      So, if you're downwind VMG is faster than the wind, you now have an actual headwind component to the wind (180 from true). If a sailor was riding on your boat and was unaware of the true wind, they would obviously say you were tacking. Just another weird angle to this mindbender. :)

  • Mark Hahn (UrbanRooster)
    Mark Hahn (UrbanRooster)

    No push back. Very cool!

    • Rick Cavallaro
      Rick Cavallaro

      Plenty of push back. Both in these comments, and from the UCLA physics professor that bet Derek $10,000 that this can't work.

  • Emerson Smith
    Emerson Smith

    you're the next king of random

  • james Dudley
    james Dudley

    It's like a solar pannel driving a electric motor

    • james Dudley
      james Dudley

      @Rodolfo Padilla Ruiz I was just saying it's not converting it to electricity but it's storeing the energy in the angular velocity of the wheels while creating drag it is using some of the energy to slow or reverse the fan so that the fan blades has a difference in pressure without slowing the cart down

    • Rodolfo Padilla Ruiz
      Rodolfo Padilla Ruiz

      Solar panels can do, but not that much unless the surface area is huge and is light enough, like Bertrand Picard's solar plane

  • GHOOGLEMALE
    GHOOGLEMALE

    didn't the gearing from the deraileur bike gears have some effect? - if the forces were just from the prop fair enough, but it appeared to be driving the axle via the bike gears and a chain - is this more to do with wind pressure differential than wind speed?

  • Stan Davison
    Stan Davison

    Here’s another thought to help explain this. What if that propeller were made of lead? What if it was only two foot in diameter ? What if the wheels were made of a soft spongy material? What if the body of the car was huge and shaped like a cube? What if the angle of attack of that propeller was 90 degrees, 45 degrees? 10 degrees?

  • MegaReddevil91
    MegaReddevil91

    Okay where's Mark Rober? GOnna need him to step in on this. xD

  • Maxim Strakh
    Maxim Strakh

    not fair, behind the solar wind from sunset pushed more )))))))

  • BaDaBingDK
    BaDaBingDK

    12:17 Something is clearly wrong, as the prop is turning fast, but the car is barely moving. So why is this laid out as a wind speed problem?

    • Rick Cavallaro
      Rick Cavallaro

      The vehicle has two sets of brakes - a hand brake and a foot brake. But the vehicle weighs 450 lbs without the "pilot". So we like to bring propeller pitch down to zero to do most of the deceleration, and that's pretty effective. Once we're going pretty slow, we use the actual brakes. So this is what we instructed Derek to do - and he did. But it turns out the pitch mechanism has shifted somewhat over the decade since I'd seen the Blackbird. And this had two very unfortunate effects. First the pitch could now go negative rather than bottoming out at zero. Secondly, the pitch was no longer matched between the two blades. This is what caused the awful shaking. So Derek pulled the pitch all the way back, and when he was near a stop, he used the brakes - exactly as we'd suggested. But now he's sitting still with a tailwind and a propeller with negative pitch. Now we have a ratchet that allows the wheels to drive the propeller, but it doesn't allow the propeller to drive the wheels. It will simply let it freewheel. This is there to meet the requirements for the record runs that we cannot use stored energy at any time.

    • Marko B
      Marko B

      Its powered by electric motors, he is just a lying puppet promoting brainwashing content for gullible kids.

  • Mr. Word
    Mr. Word

    Lmao that’s every scientists. They doubt someone’s new idea/discovery just for years later they learn the person they doubted were right. Neil Tyson said himself in his own book “Death by A Blackhole”

    • Rick Cavallaro
      Rick Cavallaro

      Neil deGrasse Tyson also signed on as a witness a couple of days ago to the $10,000 bet between Derek and a UCLA physics professor to decide if this is really possible.

  • flamemaster46
    flamemaster46

    Worth it.

  • John Campbell
    John Campbell

    make sense to me!!!

  • FatTail BlackSwan
    FatTail BlackSwan

    This is nuts, and ingenious! I think I'm getting the idea. Now if you make the propeller tower a wedge shape, it should be able to catch more tail wind when it's slower than wind speed?

  • Andy rimes
    Andy rimes

    i have a question , lets say i have a sail for my skateboard and i mount a fan on it powerd by a battery , im not talking small fan but the kind on stand and i have it blowing into sail , will that make the skatboard go are does it not , think about it , ive been wanting to no this for many manny years

    • Rick Cavallaro
      Rick Cavallaro

      Yes, that will make your skateboard go. But it would be more effective to simply use the fan to push you and leave the sail out of it.

    • Marko B
      Marko B

      Of course it will not go, you cant get free energy like this video is blatantly lying about, they are using electric motors and hidden batteries to brainwash the kids to believe this is real.

  • Beretta Fan
    Beretta Fan

    First few seconds of video: *suspenseful music "Slow down Derek! Pull back back! Well, I better keep watching, maybe he dies.