Risking My Life To Settle A Physics Debate

Publisert 29. mai. 2021
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 NOlong 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: nolong.infof... .

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

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References
Jack Goodman's NOlong 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

  • 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).

    • I'm mind blown

    • @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. :)

    • @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.

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

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

  • Where can I buy the model used on the treadmill? I'd like to test one.

  • Im risking my Life for gravity every day

  • Would there be a theoretical limit to how fast you can go in comparison to the wind speed around you?

  • This is something incredible and nothing less than rivolutionary. I have just a little question mark in my mind rn. Is it possible to improve the efficiency of the machine by, for example, changing the driving chain that connect the propeller and the weels with a rigid cilindrical axis with geared ends? Would this reduce vibration and/or energy lose by the flapping of the chain? This would mean an increase in weight i suppose but this question is just stuck in my head now

  • I think your explanation is a bit of an over-complication. I think what's happening here is similar to your vertical jump on concrete vs your jump on sand. On sand, you'll jump shorter because the foundation is soft and the sand spreads when you jump, therefore taking much of your jump energy with it instead of you using it. Here, while it does act like a fan, the tailwind IS the foundation in which the cart is pushing away from in order to move, and since the cart is lighter than the air flowing through the windmill, it speeds up faster than the wind. It's like how a hurricane can blow cars away. The cars will always be lighter than speeding winds. That's what I see happening here. Now all that's left to figure is why on earth people getting butt hurt over this experiment. It's cool, and it works. What's the problem here?

    • // "Here, while it does act like a fan, the tailwind IS the foundation in which the cart is pushing away from in order to move..."// Not when operating above windspeed. The aerodynamic behavior of the propeller through the air at >ws is identical to that of an airplane propeller while in flight. There IS no tailwind, but rather a headwind from the FoR of the propeller disk.

  • The explanation at the end reminded me of the mythbusters episode of a plane taking off from a conveyor belt. (Episode 97)

  • Can Black Bird be configured that it can go forward against the wind ?

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  • Now do this with actual boats!

  • An easy way to think about it is how the earth is always moving but we can’t perceive it since we are moving with it but when you drive a car you start to move faster, the earth is the wind and the vehicle while the propeller is the engine and what makes the car move

  • The missing key piece of information connecting the faster than wind sailboats and a prop driven by wheels is the keel of the boat pushing back against the water. Without the keel a boat couldn't go faster than the wind.

  • wtf my dad literally works for Joby

  • It seem perfectly logical to me that it would work, because the propeller creates thrust, doesn't take much thrust to move and as long as it creates thrust you'll move faster than the tail wind.

  • The prop isn't just a prop. It's a pair of airfoils. A rotor. Wings. So long as the lift-to-drag ratio remains positive, they will create lift. Or, in this case, pull. The 'push' of the tailwind and the gearing to the drive wheels is only part of the equation. The part which would NOT allow the vehicle to travel faster than the wind propelling it. The other part is the lift of the airfoils 'pulling', NOT PUSHING, the craft through the air. It would be like believing that modern aircraft fly by pushing the air down rather than the reality of the pressure difference LIFTING the aircraft. Put it in a wind tunnel and it'd be pretty damn obvious.

  • Great video! Would this mechanism allow it to mode upwind if it was facile upwind?

  • nice, but please stop making interesting content, im very busy lol

  • The initial cylindrical earth explanation had me sceptical, as the craft's propeller is not like the 2 hypothetical boats in that the boats are not moving directly downwind unlike the propeller, but the explanation at the end makes way more sense. This is the stuff that makes it worth waiting for new discoveries! Derek, you did a wonderful job at sharing this with us!

  • I think that if they were able to get 2.8 times the speed of the air on that rickety fabricated cart, i'm thinking that a proper, well -engineered cart would do much better. I think a lot of energy is being lost the wobbly propeller and upright, semi-rigid frame.

  • why not try using it on a boat try useing round water blades in stet of weels and useing water crunt instet of the ground ?????????????????

  • Ah, it is simple. Because a propeller turns, many people start thinking weird things. Turning things are mysterious. Aerodynamics is even more mythical. And that is why they don't get the math done.

  • The propeller is a energy taker. It takes more energy from the wind than if there is no propeller. Thus the vehicle will travel faster than the wind. Very smart mechanism. Please accept my humble respects🙏🙏🙏

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  • I think a lot of people are confusing power with speed. Take an aerogenerator that produces some mega watts with wind speed and you could power a vehicle that goes faster than the wind

  • Ofc the climate change conspieacy theorists think this is real

  • Thank Matt Parker and Steve Mould for sending me here👍. Nice practical experiment. A little more air time for gearing connection between the wheels and fan would have helped.

  • Okay, but isn't this just a propellor shaped flywheel that's been optimised to convert the stored momentum into velocity for the craft by moving the medium the craft is in?

    • Slowing down the propeller slows down the wheels. It cannot use stored momentum for propulsion.

  • “Tacking downwind” nope dood nope jibing buddy jibing

  • Duh obviously fake, Derek is just using his tree trunk legs to pedal a hidden crank at a constant 8k Watts 🙄🙄😂

  • This is a documentary of those horror discovery story like the guy that had refined gas on his hands and ate it by mistake discovering artificial sweeteners, everything possible is going wrong, it sounds like an horrible idea to keep going and yet you are doing it

  • But it can push air molecules back till it reaches the speed of air itself

  • yeah of course that's possible just go downhill :)

  • I don't understand how this is hard to understand. Energy and velocity are obviously not identical. A wind turbine can generate enough electrical energy to power an electro car going much faster then the wind that ultimately powers it.

  • You should look how that applies with electric windmills. Being stationary, they catch the wind and therefor must feel some of that energy in the construction itself. Very interesting.

  • There are a lot of people building better versions as we speak because of fhis

  • People be creative in so amazing ways. Wonderful. ✌🏼

  • My mind is truly blown. Great engineering and thinking outside the box on this one!

  • Gene could fly the house better in the movie Up than here. Jokes aside he id a really great flyer.

  • It's so beautiful that some relatively unknown professors made this possible as opposed to some big-timers at MIT or something. Way to go guys!!!! :D

    • "I understand nothing" - Michael Scott

  • After thinking about it for a while, I'm pretty sure that the real explanation has nothing to do with "thrust" generated by the fan, as that would mean it would also work in still air and break conservation of energy, but rather the fact that since the fan is spinning, intersection points between it and the wind move slower than the car, and also the wind, so it can in fact push on the fan.

    • The explanation with propeller thrust is correct, and doesn't mean it would also work without true wind, because it requires a velocity difference between ground and air. See the pinned comment by Derek. Your explanation is also correct, and perfectly consistent with the above.

  • Thats why i watch your videos , you know the fooking physics ....

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  • Very cool experiment, what is actually happening is the prop is creating a low pressure area in the front of it, the same as an airplane or a boat prop. The prop and anything attached to it will then accelerate into that low pressure area. Since you have the wheels driveline in gear with the prop you will eventually get to a point of equilibrium at a speed that is a multiple of the actual wind speed. The prop blades are also acting as a rotary sail that are being pushed by the wind to get the vehicle moving to start with.Sailboats can also do this using a stationary helical sail.

  • Does that mean if you tail behind this vehicle you would go slower? (instead of getting a slipstream)

  • According to the sailboat going around a cylinder example, would just a prop be able to accelerate the vehicle faster than the wind, without the wheels + backwards fan mechanism used in this vehicle?

    • @Sai Raj You are missing the direction of motion vs forces. Along the crosswind direction, the keel forces the sail to move *against* the aerodynamic force. This corresponds to the wheels forcing the propeller to rotate *against* the aerodynamic torque. Without the transmission the propeller would spin like a turbine (according to the aerodynamic torque), and just create drag above windspeed.

    • @eyytee I guess it's that animation that's confusing me. It shows an example where no wheel-transmission system are required for it to work. Just wondering what I'm missing.

    • @eyytee In the case of the propellers, won't they be rotating, and hence moving across the wind. The keel in this case is the centre of the propeller which keeps the blades anchored. Basically, what is being shown in the video in the animation of the two sailboats going around a cylindrical world.

    • @Sai Raj "Could you vary the angle of the propeller blades to achieve this rather than the wheel-transmission mechanism?" No, just like no matter how you orient the sail, the sailboat will not outrun the wind going directly downwind. You have to force the airfoils across the wind using the surface.

    • ​@Rick Cavallaro Could you vary the angle of the propeller blades to achieve this rather than the wheel-transmission mechanism? Sort of like how the sails are managed on a sailboat. Keeping the convex side facing forward of course.

  • This actually makes sense in my head, and I don't know why. It's a land and an air vehicle in one. Wind speed is measured relative to a stationary object on the ground. The wind is pushing the cart at that speed, so as we measure the speed of the cart relative to the ground, we get the same speed. However, we are also measuring the speed relative to the wind and as we match with it, we reach a net speed of zero. But, we have to account for the blade acting as a prop. Since it is being driven by the cart being pushed forward, the prop is able to then create thrust relative to the air speed and begins acting like an aircraft. Way too cool. This then makes me want to see the prop size reduced and the entire mechanism balanced (to avoid the vibrations in the video) and the gearing changed to increase the difference between the air speed and the available thrust. You could even make a design on the back that when viewed from the rear, acts as a catch for the air coming toward it, but from the front is just angled for the air to go over/around. Hopefully that would allow for the extra boost to get started, without causing excess drag once you achieve any sort of speed from the thrust of the prop.

  • Really cool, man! Great vid. Thanks!

  • the propeller get torque from the wheels, right? and that's why there is more load and drag force to the wheels, right? how can the additional thrust that produced by the propeller outweigh the drag force on the wheels ??? as far as i know, i was expecting the additional thrust would be equal or less than the drag force of the wheels.

    • See the example at the end of the pinned comment.

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  • Great video, buddy!

  • From this discovery I hope one day we will be able to go lighter speed than light speed using the energy of light speed.

    • From this discovery that's not very easy, as this relies on air, and aerodynamics does not scale well to relativity, where stuff travelling near the speed of light will likely cause nuclear fusion of air particles.

  • This violates no physics principles.. there is no such thing as conservation of velocity. Only conservation of momentum and energy

    • Fake and your really dumb if you believe this.

  • "I understand nothing" - Michael Scott

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  • Everybody gangsta till they realize it's a curious toy of no practical use.

    • Theoretical physists become even more gangsta after realising that.

  • Pretty sure it's possible to make a wind-powered vehicle that go directly into the wind as well. By coincidence, I had the thought experiment instantaneously a couple days before seeing this video!

  • tiny brain melt

  • the thing that annoys me the most is that you put that APC prop on backwards on your demo model

    • If that's the thing that annoys you the most, I'd say he did a spectacular job overall! :)

  • wow this is so awesome!

  • What is this?!? I came to the comments to see violent arguments and have only found polite individuals

  • The feminine whining about safety is so pathetic.

  • Simply awesome. I always recall being fascinated reading (as a kid so could be wrong!) that for the SR-71 it was low pressure that had more impact on speed than thrust, I wonder if this cool machine's name was a nod to that amazing plane? And history shows time & time again that new discoveries are often dismissed by the establishment, curious how folks forget that!

    • I named it the Blackbird as a nod to the Greenbird land yacht which still owns the fastest sailing world record, although the flat black finish of the craft did remind me of the SR-71.

  • Now i want a Sailboat that uses this mechanism !

  • 🦠🦠🦠🦠🦠🦠🦠🦠 Und was ich mit dieser Aussage beenden möchte, ist der Ruf Allahs im Vers seines Buches , Er warnt mit seiner Qual (mit Brustkrankheit) zu foltern, als Bestätigung der Aussage Allahs des Allmächtigen: ( O ihr Menschen , zu euch ist nunmehr eine Ermahnung von eurem Herrn gekommen und eine Heilung für das , was in den Brüsten ist , eine Rechtleitung und Barmherzigkeit für die Gläubigen.)57- Younus Das ist eine Predigt der Folter und Ermahnung für die Allahsfürchtigen. Ich weiß, dass dies die Menschen in Leid, Schmerz und Panik versetzt , vielleicht werden sie Buße tun, und Allah allein dienen und keinen Partner neben ihm nehmen, und ihre Sünden , Ungerechtigkeiten und die abscheulichen, sichtbaren und unsichtbaren Werke zutiefst bereuen, und die rituelle Waschung vollziehen, und die völlige Hingabe an Allah zeigen. Ihr sollt mit Gewissheit wissen, dass es sich um eine Globale verbogene Strafe von dem Einen, dem Allmächtigen handelt und nicht bloß eine Pandemie, wie sie behaupten . Ausgeschlossen, Ausgeschlossen und bald werdet ihr es erfahren , es gibt keine andere Zuflucht vor Allah außer bei Ihm, ich bin von ihm ein offenkundiger Warnerund versperrt nicht Seine Häuser von denen, die zu ihrem Herrn flüchten, um das Gebet für den Herrn zu verrichten ,weil die Moscheen gehören Allah . Darum beten sie niemand neben den Herrn an. und wer die Häuser Allahs betritt, um seinen Herrn anzubeten , dürfte vor dem Erstickungsvirus geschützt sein , selbst wenn er mit infizierten Leuten zusammen war, denn die Betenden rechtschaffenen ,die sich auf Allah verlassen, werden nicht angesteckt, also vertraut Allah wenn ihr an ihn glaubt ! Wisst ihr, dass das Coronavirus eine neue Qual mit einer starken Schlagkraft ist , die zur Brustkrankheit führt. dann Stück für Stück drosselt den Atem bis Gott ihm seinen letzten Atemzug nimmt. wer geheilt wurde soll wissen , dass es nicht durch Ärzte und Medikamente geheilt ist ,sondern durch seine Gebete zu Allah , dem barmherzigsten. daher werden sie kein Heilmittel für das Virus finden. Es ist keine Prüfung für euch, mit dem Allah das verborgene der Brüste prüft ,sondern eine Strafe für die Brüste, die er von den Abwendern unter euch wählt , damit sie zu Allah zurückkehren. einige von euch sterben durch das Ersticken von dem, was ihr Coronarvirus nennt , in Wirklichkeit aber ist es die kleine Strafe an viele Menschen , damit sie zu Allah zurückkehren und den Herrn anflehen, um das Böse der Strafe von ihnen wegzunehmen und den Heiligen Koran , dem Wahren Buch, von ihrem Herrn zu folgen.. Auf keinen Fall wird das Übel weggenommen von denen, die sich niederwerfen auf dem, was sie die Erde Al-Husseins nennen , denn Allah hat solche Aussagen weder im Quran noch in der Sunna herabgesandt, sie haben es nur erfunden . Genauso wird das Übel nicht von jenen genommen, die die Toten rufen, um sie vor dem bösen zu beschützen ,weil ihre Bitten hören sie nicht , und selbst wenn sie diese auch hören würden, würden sie nicht antworten , und am Jüngsten Tag werden sie verleugnen und werden gegen sie sein . Wie oft haben wir Sie gewarnt und Ihnen geraten, niemanden neben Allah anzurufen, aber leider glauben die meisten von ihnen nicht an Allah , und stellen Ihm gleichzeitig Götzen zur Seite.. Ebenso warne ich auch generell die Tyrannen, die Souveränen , und ihre Nachfolger in den Muslimischen Länder ,und auf der ganzen Welt, vor der geringeren Strafe und von anderen Bestrafungsarten , bis hin zur größeren Strafe, die die Unterdrücker und Unheilstifter bedeckt .Dein Herr liegt ihnen auf der Lauer . Ich warne euch auch vor der Qual des Asteroiden des Bebens , Er wird alles was hinter dem Atlantischen Ozean liegt bis zu hin zum Westen, in den Vereinigten Staaten von Amerika heftig erschüttern lassen. Er wird Staub vom Boden ihres Landes aufwirbeln lassen . Der Weltraum befüllt sich dann mit diesem Staub, zufolge wird sich eine Starke Welle über der ganzen Welt ausbreiten. bald werdet ihr Wissen, dass ich euch die Wahrheit verkündet habe. und danach kommt der Planet Sakar ,wenn der Asteriod der Strafe euch nicht zur Vernunft bringt . So fürchtet Allah , oh ihr Gläubigen, die einen Verstand besitzen. Und das versprochene große Unheil im Land der gesegneten Al-Aqsa-Moschee ist gekommen , der erste von zwei Qeblas. sicherlich der Heiligkeitsgrad der Al-Aksa-Moschee und der Heiligen Moschee (Al-Haram) liegen bei Allah gleich . oh die Gottes Heiliges Haus verkauft habt, ihr werdet vor Allah Strafe weder Schutzherrn noch Behüter finden , dann werdet ihr das Diesseits und das Jenseits verlieren ,was für ein enormer Verlust , und der Tot kommt schleichend zu euch , während ihr euch achtlos abwendet , ich bin ein getreuer Ratgeber. Oh Allah, ich habe die Botschaft überbracht. Oh Allah, sei Zeuge. Und Friede sei auf den Gesandten und alles Lob gebührt Allah, dem Herrn der Welten Allahs Khalifa und Diener , Imam Mahdi Nasser Mohammed El-Yemeni. _____________ 10 .07 .1441 AH 05.03.2020 AD 12:51 Pm w w w . m a h d i a l u m m a. c o m ********

  • Он не двигался быстрее ветра. Скорость уравнивалась бы в любом случае. Он просто этим огромным вентилятором засасывал ту ленту к себе, поэтому так казалось. Расходимся. This thing isn't moving faster than wind. It's just this big fan sucked air from the front. The pressure at the back will balance out anyway.

  • Naysayers like those are not interested in debate, they are interested in maintaining the status quo. They'll just move on to the next person who challenges "The Way Things Are". They are bullies. Don't expect, "Oh my gosh, I'm sorry, I was SO wrong. I just wasn't thinking...I didn't KNOW..."

  • I don't think no one will believe me but me and my twin where thinking about making something like this but on a car that uses the motion on the back wheels to spin the front wheels

    • Like every rear wheel drive car ever made.

  • Understood the “Tell Tail” but unclear if your forward ground speed was clocked at a greater speed than the surface wind? Or is the Tell TIl just being sucked into the lower pressure created in front of the propeller? I thought the cylindrical graphic analogy made the theory very clear; just wondering if you validated with additional data? Very cool! Thanks! Love it when I have to think!

  • put a retractable sail on this and its something straight out of mad max

  • I wonder if you could make an ultralight aircraft out of this. Point the fan a bit higher, strap some big thin wings on there, I think it's doable.

    • It may be doable, but it won't be an ultralight. It weighs about 450 lbs.

  • mans playing bad piggies in real life

  • Will this work on water but with the propeller geared to the prop? Maybe this could replace sails?

  • So ultimately, the energy comes from the velocity difference between the wind and the ground. The whole concept makes more sense if you imagine it on a treadmill in a room with no wind. The treadmill moves, causing the propeller to spin, causing forward force.

    • It helps understand that it's all the action of gears

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  • Thank you I had a similar question for which I could not find the answer for months ! and you did !!

  • The explanation with the 2 boats on the cylindrical earth has nothing to do with actual system the land vehicle works, I don't understand why people found the explanation there, the principle on the cylindrical earth is to get that cross wind with the boats, nothing to do with the propeller, cause has he explain in the end, works as a fan pushing the "slow wind" behind it.

    • The sail and the propeller blades are both just efficient airfoils. The wheels and transmission force the propeller blades to move across the wind, just like the keel of the boat forces the sail to move across the wind.

    • @Rogério Costa They are aerodynamically identical. All wings create low pressure on one side and higher pressure on the other. This is simply the other side of the coin of "pushing air back (or down)".

    • @John Borton The wheels are making the propeller spin, pushing air back, while the boats are not pushing air back, they are creating a low pressure zone on the down side (the front) of the sail, I guess you didn't get it either 😉

    • The explanation of the 2 boats on the cylindrical earth is exactly how the rotor portion of the land vehicle works. If you think different, you don't understand how the land vehicle works.

  • troll physics but it works

  • so in constant wind, what kind of speeds can achieved? Can this be done on water wit hydrofoils to reduce drag, and a prop gears like the wheels?

    • max_speed = wind_speed / (1 - efficiency). On water you replace the wheels with a turbine. The efficiency will be lower.

  • ..Disaster of corona war and climate war will surely intensify In the name of Allah, there is no power except with Allah the Most Exalted-High, the Great, we belong to Allah and to Him we shall return.. O community of Muslims, so often I have advised you throughout sixteen years, I called you to worship Allah, Him Alone, no partner for Him, and I called the people all together to worship Allah, Him Alone, no partner for Him. And I gave you fatwa with the truth that you should believe that there is no God except Allah, Him Alone, no partner for Him, and that the illiterate prophet Mohammad is a messenger of Allah with the grand Quran as mercy for the worlds. So why do you reject Allah’s guidance and His mercy. Indeed, by Allah Who there is no God other than Him. I do not know a solution for you to what you are in from Allah’s climate war, and Allah’s global war by His tiniest soldiers (mentioned) in the Book, strains of Ba-ooda that you do not encompass knowledge about it; that’s what you call it strains of corona “variants” yet it is not a corona! Surely, you can not and could never be able to defeat it so you can stop Allah’s climate war by air, sea and land. Perhaps the entire presidents of the humans’ countries would like to say: “We can reduce what you call it Allah’s climate war by reducing the exhaust-emissions of carbon gases had been emitted from our factories to the fact it caused disruptions to the climate of planet earth because of the warming in the upper layer of earth’s climate shield which caused the global warming to earth the earth of humans became suffering from heating fever and we want to treat planet earth from the global warming phenomena”. Then the Awaited Mahdi who Allah selected him as His khalifa over the worlds replies to you and I say: O community leaders of humans and their people, by Allah Who there is no God other than Him, if you stopped the emissions of your factories and exhaust-emissions of your motor-vehicles, and the entire exhaust-emissions of your ships and your trains, also the fumes of your wood fires even if you completely stopped your lives’s wheel even if you lived a thousand years, Allah would not have reduced His climate war against you for the fact, theory of global warming is a forged theory. Rather, the truth is because of the approach of the planet of chastisement and its gravitation with the sun, the sun’s boiling-pot overflowed and it affected the moon, earth and the climate of earth. As that you never be able to control the global war of Ba-ooda. We will bring the matter closer to you: If you are able to stand up for the war of the tiniest soldiers of Allah (mentioned) in the Book, then here you can stop the war of the heavens and earth. Since I am the Imam Mahdi Nasser Mohammad, the man who Allah taught him the true explanatory-statement for the grand Quran, I say: O community of decision makers; leaders of the humans, if Nasser Mohammad Al-Yemeni is an insolent liar that Allah chose him as His khalifa over the worlds; so if I am a liar then my lie is against me and would never afflict you a thing of what Nasser Mohammad Al-Yemeni had promised you with. But if Nasser Mohammad Al-Yemeni is truly khalifa of Allah over the worlds, then - O community of decision makers; leaders of the humans, you should know that you do not have veto right upon issuance of command decision of Allah the One, the Subduer, glory be to Him the Exalted Most High beyond measure, He does not associate anyone with His judgement, and you can never find refuge for you in which you can hide besides Him, and never anyone can protect you from Allah’s chastisement. Here I am the Imam Mahdi Nasser Mohammad, I announce Allah’s command that Allah will open against you a door of severe chastisement in addition to the scale rise of Allah’s climate war and it is not far off, and every stubborn believer would be disappointed. Perhaps, the entire great (power) decision makers among leaders of the humans would like to say: “And what is it?! Verily, tell us so we would be ready to hinder it.” Then the Imam Mahdi Nasser Mohammad Al-Yemeni replies to you and I say: You could not hinder Allah’s soldiers that are less than it, so how can you defend yourselves against the lion soldier among Allah’s soldiers, corona?! Yet it is not corona, in fact it is (Mateen) firm plan from Allah, so how can you hinder the firm plan from Lord of the worlds ; a gift from Allah the One, the Subduer, He targets the decision makers specially and the criminals in general who exceeded limits in the lands in which they increased mischief, then they filled earth with injustice and oppression? Unfortunately, the death disaster came suddenly, surely it will kill you standing-up, sitting, or (laying) on your sides, or directly on air in front of the camera lens. O community of doctors, do not say a brain stroke; rather, the lion virus killed him and his ilk; a firm plan (Mateen) from Allah. That’s what Allah threatened you with in His decisive Book the grand Quran in the verse in which Allah addresses His khalifa Al-Mahdi Nasser Mohammad Al-Yemeni after passing 15 years for the global Mahdi-ship call to resort for judgement to Allah’s Book the grand Quran and following it, then the arrogant decision makers among the disbelievers and the Muslims turned away, consequently, a command was issued to khalifa of Allah upon knowledge from Allah in the word of Allah the Most High: {So leave Me alone with him who rejects this announcement. We shall lead them on (to destruction), from where they do not know.(44) And I fill them (with false hopes), surely My plan is firm (Mateen).(45)}Truthful Allah the Great [Al-Qalam] 68:44-45 { فَذَرْنِي وَمَن يُكَذِّبُ بِهَٰذَا الْحَدِيثِ ۖ سَنَسْتَدْرِجُهُم مِّنْ حَيْثُ لَا يَعْلَمُونَ ‎﴿٤٤﴾‏ وَأُمْلِي لَهُمْ ۚ إِنَّ كَيْدِي مَتِينٌ ‎﴿٤٥﴾‏ } صدق الله العظيم [ سورة القلم ]. Imam Mahdi Nasser Mohammad Al-Yemeni 21 - Ramadan - 1442 AH 03 - 05 - 2021 AD

  • You're going faster than the speed of wind and still feeling the wind... Which proves that if you travel faster than light then also you can see the light not just darknes 😂😂jk...lol

    • Ha ha ha.. So funny shut up

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  • The sail/airfoil thing made me think of those insane RC slope soaring speed records

  • question... how does momentum factor into this -- given the wheels and prop do acquire some momentum that would help with energy conservation -- unlike a sailboat, where once the wind stops, there is only drag? bc of that, i was very glad to see that they kept filming long enough to get past any residual momentum -- that they were able to maintain the faster speed. -------------------------- EDIT - there is a lot of discussion on drag, but momentum/conservation of energy not hardly. and, given the amount of energy in a turbine, that would seem to factor in. -------------------------- also curious... wind is generally not uniform in force, so does the apparatus smooth out those fluctuations, or did you feel (did it react to) any small change in wind velocity?

  • The same effect is also the reason why you are able to sail against the wind.

  • I feel like something that wasn't addressed in this video but might help... How do airfoils and the energy therein, play a role in this situation, if at all?

    • @David Poynter The transmission has a fixed gear ratio during a run: they can only switch sprockets between runs. An airfoil is just an efficient way to exert a force on air.

    • @eyytee - there are multiple gears/ratios shown in the first minute of the video, and there is a whole like 2 minute segment equating the blades to sails which as an example of how airfoils allow them to go faster than the wind speed itself. Either the analogies are completely off base, or airfoils play a part in the creation of this mechanism, and I would like to know how. Based on his comment explaining the math behind the relative airspeed of the blades being different than the ground speed, it seems to cement the idea that airfoils play a role in the proposition of the craft.

    • It has a fixed gear ratio, so it cannot release the energy stored in the blades, without slowing down the cart.

    • e.g. - A prop from a plane can be viewed as a "fan blowing backward", but the primary force moving the plane forward is actually the pull from the airfoil.

  • That is some pretty efficient prop blades. The question I have is which is the greater force, the lift of the blades or the push of the compressed air behind them?

    • @Rick Cavallaro Thanks, I don't study this stuff and that was the best question I could think of.

    • Those are two sides of the same coin. You can compute lift via pressure differential (Bernoulli) or rate of change of momentum (Newton) and get the same result either way.

  • ..Disaster of corona war and climate war will surely intensify In the name of Allah, there is no power except with Allah the Most Exalted-High, the Great, we belong to Allah and to Him we shall return.. O community of Muslims, so often I have advised you throughout sixteen years, I called you to worship Allah, Him Alone, no partner for Him, and I called the people all together to worship Allah, Him Alone, no partner for Him. And I gave you fatwa with the truth that you should believe that there is no God except Allah, Him Alone, no partner for Him, and that the illiterate prophet Mohammad is a messenger of Allah with the grand Quran as mercy for the worlds. So why do you reject Allah’s guidance and His mercy. Indeed, by Allah Who there is no God other than Him. I do not know a solution for you to what you are in from Allah’s climate war, and Allah’s global war by His tiniest soldiers (mentioned) in the Book, strains of Ba-ooda that you do not encompass knowledge about it; that’s what you call it strains of corona “variants” yet it is not a corona! Surely, you can not and could never be able to defeat it so you can stop Allah’s climate war by air, sea and land. Perhaps the entire presidents of the humans’ countries would like to say: “We can reduce what you call it Allah’s climate war by reducing the exhaust-emissions of carbon gases had been emitted from our factories to the fact it caused disruptions to the climate of planet earth because of the warming in the upper layer of earth’s climate shield which caused the global warming to earth the earth of humans became suffering from heating fever and we want to treat planet earth from the global warming phenomena”. Then the Awaited Mahdi who Allah selected him as His khalifa over the worlds replies to you and I say: O community leaders of humans and their people, by Allah Who there is no God other than Him, if you stopped the emissions of your factories and exhaust-emissions of your motor-vehicles, and the entire exhaust-emissions of your ships and your trains, also the fumes of your wood fires even if you completely stopped your lives’s wheel even if you lived a thousand years, Allah would not have reduced His climate war against you for the fact, theory of global warming is a forged theory. Rather, the truth is because of the approach of the planet of chastisement and its gravitation with the sun, the sun’s boiling-pot overflowed and it affected the moon, earth and the climate of earth. As that you never be able to control the global war of Ba-ooda. We will bring the matter closer to you: If you are able to stand up for the war of the tiniest soldiers of Allah (mentioned) in the Book, then here you can stop the war of the heavens and earth. Since I am the Imam Mahdi Nasser Mohammad, the man who Allah taught him the true explanatory-statement for the grand Quran, I say: O community of decision makers; leaders of the humans, if Nasser Mohammad Al-Yemeni is an insolent liar that Allah chose him as His khalifa over the worlds; so if I am a liar then my lie is against me and would never afflict you a thing of what Nasser Mohammad Al-Yemeni had promised you with. But if Nasser Mohammad Al-Yemeni is truly khalifa of Allah over the worlds, then - O community of decision makers; leaders of the humans, you should know that you do not have veto right upon issuance of command decision of Allah the One, the Subduer, glory be to Him the Exalted Most High beyond measure, He does not associate anyone with His judgement, and you can never find refuge for you in which you can hide besides Him, and never anyone can protect you from Allah’s chastisement. Here I am the Imam Mahdi Nasser Mohammad, I announce Allah’s command that Allah will open against you a door of severe chastisement in addition to the scale rise of Allah’s climate war and it is not far off, and every stubborn believer would be disappointed. Perhaps, the entire great (power) decision makers among leaders of the humans would like to say: “And what is it?! Verily, tell us so we would be ready to hinder it.” Then the Imam Mahdi Nasser Mohammad Al-Yemeni replies to you and I say: You could not hinder Allah’s soldiers that are less than it, so how can you defend yourselves against the lion soldier among Allah’s soldiers, corona?! Yet it is not corona, in fact it is (Mateen) firm plan from Allah, so how can you hinder the firm plan from Lord of the worlds ; a gift from Allah the One, the Subduer, He targets the decision makers specially and the criminals in general who exceeded limits in the lands in which they increased mischief, then they filled earth with injustice and oppression? Unfortunately, the death disaster came suddenly, surely it will kill you standing-up, sitting, or (laying) on your sides, or directly on air in front of the camera lens. O community of doctors, do not say a brain stroke; rather, the lion virus killed him and his ilk; a firm plan (Mateen) from Allah. That’s what Allah threatened you with in His decisive Book the grand Quran in the verse in which Allah addresses His khalifa Al-Mahdi Nasser Mohammad Al-Yemeni after passing 15 years for the global Mahdi-ship call to resort for judgement to Allah’s Book the grand Quran and following it, then the arrogant decision makers among the disbelievers and the Muslims turned away, consequently, a command was issued to khalifa of Allah upon knowledge from Allah in the word of Allah the Most High: {So leave Me alone with him who rejects this announcement. We shall lead them on (to destruction), from where they do not know.(44) And I fill them (with false hopes), surely My plan is firm (Mateen).(45)}Truthful Allah the Great [Al-Qalam] 68:44-45 { فَذَرْنِي وَمَن يُكَذِّبُ بِهَٰذَا الْحَدِيثِ ۖ سَنَسْتَدْرِجُهُم مِّنْ حَيْثُ لَا يَعْلَمُونَ ‎﴿٤٤﴾‏ وَأُمْلِي لَهُمْ ۚ إِنَّ كَيْدِي مَتِينٌ ‎﴿٤٥﴾‏ } صدق الله العظيم [ سورة القلم ]. Imam Mahdi Nasser Mohammad Al-Yemeni 21 - Ramadan - 1442 AH 03 - 05 - 2021 AD

  • ..Disaster of corona war and climate war will surely intensify In the name of Allah, there is no power except with Allah the Most Exalted-High, the Great, we belong to Allah and to Him we shall return.. O community of Muslims, so often I have advised you throughout sixteen years, I called you to worship Allah, Him Alone, no partner for Him, and I called the people all together to worship Allah, Him Alone, no partner for Him. And I gave you fatwa with the truth that you should believe that there is no God except Allah, Him Alone, no partner for Him, and that the illiterate prophet Mohammad is a messenger of Allah with the grand Quran as mercy for the worlds. So why do you reject Allah’s guidance and His mercy. Indeed, by Allah Who there is no God other than Him. I do not know a solution for you to what you are in from Allah’s climate war, and Allah’s global war by His tiniest soldiers (mentioned) in the Book, strains of Ba-ooda that you do not encompass knowledge about it; that’s what you call it strains of corona “variants” yet it is not a corona! Surely, you can not and could never be able to defeat it so you can stop Allah’s climate war by air, sea and land. Perhaps the entire presidents of the humans’ countries would like to say: “We can reduce what you call it Allah’s climate war by reducing the exhaust-emissions of carbon gases had been emitted from our factories to the fact it caused disruptions to the climate of planet earth because of the warming in the upper layer of earth’s climate shield which caused the global warming to earth the earth of humans became suffering from heating fever and we want to treat planet earth from the global warming phenomena”. Then the Awaited Mahdi who Allah selected him as His khalifa over the worlds replies to you and I say: O community leaders of humans and their people, by Allah Who there is no God other than Him, if you stopped the emissions of your factories and exhaust-emissions of your motor-vehicles, and the entire exhaust-emissions of your ships and your trains, also the fumes of your wood fires even if you completely stopped your lives’s wheel even if you lived a thousand years, Allah would not have reduced His climate war against you for the fact, theory of global warming is a forged theory. Rather, the truth is because of the approach of the planet of chastisement and its gravitation with the sun, the sun’s boiling-pot overflowed and it affected the moon, earth and the climate of earth. As that you never be able to control the global war of Ba-ooda. We will bring the matter closer to you: If you are able to stand up for the war of the tiniest soldiers of Allah (mentioned) in the Book, then here you can stop the war of the heavens and earth. Since I am the Imam Mahdi Nasser Mohammad, the man who Allah taught him the true explanatory-statement for the grand Quran, I say: O community of decision makers; leaders of the humans, if Nasser Mohammad Al-Yemeni is an insolent liar that Allah chose him as His khalifa over the worlds; so if I am a liar then my lie is against me and would never afflict you a thing of what Nasser Mohammad Al-Yemeni had promised you with. But if Nasser Mohammad Al-Yemeni is truly khalifa of Allah over the worlds, then - O community of decision makers; leaders of the humans, you should know that you do not have veto right upon issuance of command decision of Allah the One, the Subduer, glory be to Him the Exalted Most High beyond measure, He does not associate anyone with His judgement, and you can never find refuge for you in which you can hide besides Him, and never anyone can protect you from Allah’s chastisement. Here I am the Imam Mahdi Nasser Mohammad, I announce Allah’s command that Allah will open against you a door of severe chastisement in addition to the scale rise of Allah’s climate war and it is not far off, and every stubborn believer would be disappointed. Perhaps, the entire great (power) decision makers among leaders of the humans would like to say: “And what is it?! Verily, tell us so we would be ready to hinder it.” Then the Imam Mahdi Nasser Mohammad Al-Yemeni replies to you and I say: You could not hinder Allah’s soldiers that are less than it, so how can you defend yourselves against the lion soldier among Allah’s soldiers, corona?! Yet it is not corona, in fact it is (Mateen) firm plan from Allah, so how can you hinder the firm plan from Lord of the worlds ; a gift from Allah the One, the Subduer, He targets the decision makers specially and the criminals in general who exceeded limits in the lands in which they increased mischief, then they filled earth with injustice and oppression? Unfortunately, the death disaster came suddenly, surely it will kill you standing-up, sitting, or (laying) on your sides, or directly on air in front of the camera lens. O community of doctors, do not say a brain stroke; rather, the lion virus killed him and his ilk; a firm plan (Mateen) from Allah. That’s what Allah threatened you with in His decisive Book the grand Quran in the verse in which Allah addresses His khalifa Al-Mahdi Nasser Mohammad Al-Yemeni after passing 15 years for the global Mahdi-ship call to resort for judgement to Allah’s Book the grand Quran and following it, then the arrogant decision makers among the disbelievers and the Muslims turned away, consequently, a command was issued to khalifa of Allah upon knowledge from Allah in the word of Allah the Most High: {So leave Me alone with him who rejects this announcement. We shall lead them on (to destruction), from where they do not know.(44) And I fill them (with false hopes), surely My plan is firm (Mateen).(45)}Truthful Allah the Great [Al-Qalam] 68:44-45 { فَذَرْنِي وَمَن يُكَذِّبُ بِهَٰذَا الْحَدِيثِ ۖ سَنَسْتَدْرِجُهُم مِّنْ حَيْثُ لَا يَعْلَمُونَ ‎﴿٤٤﴾‏ وَأُمْلِي لَهُمْ ۚ إِنَّ كَيْدِي مَتِينٌ ‎﴿٤٥﴾‏ } صدق الله العظيم [ سورة القلم ]. Imam Mahdi Nasser Mohammad Al-Yemeni 21 - Ramadan - 1442 AH 03 - 05 - 2021 AD

  • I would really like to see this run over a longer period of time since I suspect it cannot remain above wind speed indefinitely and would act kind of like a spring. I think this is actually intuitive if you think about it in a certain way. If the craft could run above wind speed indefinitely then why doesn't it start moving at rest? It might seem absurd to say it like that, but if the relative air speed is the same as the vehicle then that would be what you would have. Well the main difference obviously is the fan propeller is moving. It is pretty obvious if I spun the fan at rest then the vehicle would start moving, but it is absurd to think at that point it will move forever which is the implication if you say that the vehicle can stay above windspeed. I think what you are seeing is the vehicle is turning some of the wind energy into energy spinning the fan and then uses that energy when it goes above wind speed, eventually it will run out and then will drop below windspeed and repeat the process. The key here is that it is not accelerating as fast it can and is instead saving some of the energy. The implication being that it will never actually go faster than a ship staying at windspeed long term, but you can find intervals where it appears to. This is basically equivalent to a machine which has a windmill charge a battery, then drops a sail to get to windspeed, hoists the sail, and then uses the battery to go faster. It seems clear that such a system cannot maintain going over windspeed.

    • @eyytee what is "true wind" and also how can you be certain? None of the demonstrations that I saw seem to show that.

    • "I suspect it cannot remain above wind speed indefinitely " It goes faster than the wind, as long there is true wind. It's not using stored energy for propulsion.

  • So.. This is so counterintuitive, but so cool.. I have to wonder what efficiency improvements can be made. You are now using mechanical linkages to convert the forward movement into rotation of the blades - I'm wondering if the losses in the friction of those mechanisms are more than you would have if you converted the energy to electricity, and then ran a motorized fan on the back. If that also worked, it would appear even more as if it were a perpetual motion machine than it already does..

  • ..Disaster of corona war and climate war will surely intensify In the name of Allah, there is no power except with Allah the Most Exalted-High, the Great, we belong to Allah and to Him we shall return.. O community of Muslims, so often I have advised you throughout sixteen years, I called you to worship Allah, Him Alone, no partner for Him, and I called the people all together to worship Allah, Him Alone, no partner for Him. And I gave you fatwa with the truth that you should believe that there is no God except Allah, Him Alone, no partner for Him, and that the illiterate prophet Mohammad is a messenger of Allah with the grand Quran as mercy for the worlds. So why do you reject Allah’s guidance and His mercy. Indeed, by Allah Who there is no God other than Him. I do not know a solution for you to what you are in from Allah’s climate war, and Allah’s global war by His tiniest soldiers (mentioned) in the Book, strains of Ba-ooda that you do not encompass knowledge about it; that’s what you call it strains of corona “variants” yet it is not a corona! Surely, you can not and could never be able to defeat it so you can stop Allah’s climate war by air, sea and land. Perhaps the entire presidents of the humans’ countries would like to say: “We can reduce what you call it Allah’s climate war by reducing the exhaust-emissions of carbon gases had been emitted from our factories to the fact it caused disruptions to the climate of planet earth because of the warming in the upper layer of earth’s climate shield which caused the global warming to earth the earth of humans became suffering from heating fever and we want to treat planet earth from the global warming phenomena”. Then the Awaited Mahdi who Allah selected him as His khalifa over the worlds replies to you and I say: O community leaders of humans and their people, by Allah Who there is no God other than Him, if you stopped the emissions of your factories and exhaust-emissions of your motor-vehicles, and the entire exhaust-emissions of your ships and your trains, also the fumes of your wood fires even if you completely stopped your lives’s wheel even if you lived a thousand years, Allah would not have reduced His climate war against you for the fact, theory of global warming is a forged theory. Rather, the truth is because of the approach of the planet of chastisement and its gravitation with the sun, the sun’s boiling-pot overflowed and it affected the moon, earth and the climate of earth. As that you never be able to control the global war of Ba-ooda. We will bring the matter closer to you: If you are able to stand up for the war of the tiniest soldiers of Allah (mentioned) in the Book, then here you can stop the war of the heavens and earth. Since I am the Imam Mahdi Nasser Mohammad, the man who Allah taught him the true explanatory-statement for the grand Quran, I say: O community of decision makers; leaders of the humans, if Nasser Mohammad Al-Yemeni is an insolent liar that Allah chose him as His khalifa over the worlds; so if I am a liar then my lie is against me and would never afflict you a thing of what Nasser Mohammad Al-Yemeni had promised you with. But if Nasser Mohammad Al-Yemeni is truly khalifa of Allah over the worlds, then - O community of decision makers; leaders of the humans, you should know that you do not have veto right upon issuance of command decision of Allah the One, the Subduer, glory be to Him the Exalted Most High beyond measure, He does not associate anyone with His judgement, and you can never find refuge for you in which you can hide besides Him, and never anyone can protect you from Allah’s chastisement. Here I am the Imam Mahdi Nasser Mohammad, I announce Allah’s command that Allah will open against you a door of severe chastisement in addition to the scale rise of Allah’s climate war and it is not far off, and every stubborn believer would be disappointed. Perhaps, the entire great (power) decision makers among leaders of the humans would like to say: “And what is it?! Verily, tell us so we would be ready to hinder it.” Then the Imam Mahdi Nasser Mohammad Al-Yemeni replies to you and I say: You could not hinder Allah’s soldiers that are less than it, so how can you defend yourselves against the lion soldier among Allah’s soldiers, corona?! Yet it is not corona, in fact it is (Mateen) firm plan from Allah, so how can you hinder the firm plan from Lord of the worlds ; a gift from Allah the One, the Subduer, He targets the decision makers specially and the criminals in general who exceeded limits in the lands in which they increased mischief, then they filled earth with injustice and oppression? Unfortunately, the death disaster came suddenly, surely it will kill you standing-up, sitting, or (laying) on your sides, or directly on air in front of the camera lens. O community of doctors, do not say a brain stroke; rather, the lion virus killed him and his ilk; a firm plan (Mateen) from Allah. That’s what Allah threatened you with in His decisive Book the grand Quran in the verse in which Allah addresses His khalifa Al-Mahdi Nasser Mohammad Al-Yemeni after passing 15 years for the global Mahdi-ship call to resort for judgement to Allah’s Book the grand Quran and following it, then the arrogant decision makers among the disbelievers and the Muslims turned away, consequently, a command was issued to khalifa of Allah upon knowledge from Allah in the word of Allah the Most High: {So leave Me alone with him who rejects this announcement. We shall lead them on (to destruction), from where they do not know.(44) And I fill them (with false hopes), surely My plan is firm (Mateen).(45)}Truthful Allah the Great [Al-Qalam] 68:44-45 { فَذَرْنِي وَمَن يُكَذِّبُ بِهَٰذَا الْحَدِيثِ ۖ سَنَسْتَدْرِجُهُم مِّنْ حَيْثُ لَا يَعْلَمُونَ ‎﴿٤٤﴾‏ وَأُمْلِي لَهُمْ ۚ إِنَّ كَيْدِي مَتِينٌ ‎﴿٤٥﴾‏ } صدق الله العظيم [ سورة القلم ]. Imam Mahdi Nasser Mohammad Al-Yemeni 21 - Ramadan - 1442 AH 03 - 05 - 2021 AD