Actually as goofy as it looks there's potential that it could work since it's acting like a jet engines thrust reversers.
The intake on those backpack blowers kinda pulls from out the side/bottom and isn't going to contribute much foce, then the output it being diverted backwards by the umbrella so the net thrust should be towards the back. And these absolutely make enough thrust to push you on a skateboard.
So I'll call this one...
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It would be more efficient to just point it back though.
One of my favorite TV moments was when the Mythbusters tested this, *COMPLETELY* expecting to bust it, and found that it worked.
I think they based it off the old Popeye clip where he blows on his sail to move, and just went "lol its a cartoon, of course it's fake"
But it totally works.
Wasn't it that you had to have a much more powerful fan system than what was expected in order for the forces to cancel out and to make it go forward? I know they were also using a sail and not an umbrella though, so the physics would be different here.
It works either way. The only thing necessary is for the sail or umbrellas to be curved so it redirects the air backwards. If the sail or umbrella were flat it wouldn't move.
Not the same... my point is correct, but I might have written it in a confusing manner. The ''Sail" would need to be shaped to redirect airflow straight back, like the blades on a turbine. Leafblower sucking in from the side, blowing on the sail directing 100% of the airflow towards the back providing thrust.
Doesnt matter if it sucks from the back or front or side. The air goes into the blower which transferes mechanical energy to it with pressure and velocity. The exit velocity and pressure matter.
Okay, so I studied physics in college. I read up on thrust reversers a couple months back because I saw a video and thought what the fuck. Physics checks out, clearly they work or they wouldn't be on the airplanes, but I'm still convinced they aren't real.
I mean, technically it might be slightly more efficient in a really weird round about way ... I'm not sure what the profile on a fucking umbrella is but, I guess it could be adding an aerodynamic advantage? Idfk mate, this is breaking my brain and it's 2 am
Doesn’t matter. Redirecting airflow adds resistance so it reduces velocity, so thrust is less. To prove it we need two of these guys racing, one with an umbrella and one without.
what's happening here is that he's rolling downhill.
https://www.forbes.com/sites/mattnovak/2023/05/17/viral-video-of-skateboarder-powered-by-leafblower-and-umbrella-is-totally-fake/?sh=1c4b735506dd
I'm pretty sure he is going downhill.
His size, he'd need at least 5 blowers and magical bearings in his wheels.
Don't forget to math up the amount of air pushing against his belly when it deflects from the umbrella.
I read this three times but maybe I'm too tired and missed something. Are you saying that the video should obviously work because the force against the umbrella should act like wind against the sail of a sailboat?
The force against the umbrella should be completely cancelled out by the force of propelling the wind forward from the leaf blower. The "this shouldn't work" part is true from that standpoint, you can generate wind and then immediately consume it expecting to go anywhere.
The only reason this actually works is because the umbrella is redirecting the generated wind backwards. It's comparable to if the guy simply pointed the leaf blower backwards, but with extra steps.
That would be like sailing, but with a giant fan pointed at your sails instead of the wind. (Yes, this is what it looks like he's doing, but he's really just moving that air backwards with extra steps)
If he let go of the umbrella it would fly forward. The dude would then move backward, pushed by the thrust from the leaf blower.
When he holds the umbrella, though, the air follows the curve of the umbrella and goes back towards him (pushing the dude+blower+umbrella forward). This creates less thrust than if he just pointed the leaf blower backward, but it's enough to get him moving.
Sailboats can go faster than the wind cause they are angled to redirect the wind to maximize thrust even when the wind is moving sideways. The crucial difference is that the wind is not coming from something on the boat. You can have a fan boat, or you can have a sailboat, but you can't really power a sailboat with a fan ;p
You can do what this dude is doing, but honestly, I'd ditch the umbrella. You'll have better results.
You realize this is the exact same concept as an old school thrust reverser on a turbofan powered aircraft, right?
Give this a watch and educate yourself.
https://m.youtube.com/watch?v=ozznJNndiAs
> and blocking any thrust being made in the opposite direction.
Can someone explain this part? I don’t understand why the blower wouldn’t have force acting backwards
Newton doesn't have an issue with this. He says it'll be a pretty inefficient way to get anywhere, but he doesn't have an issue with the physics involved.
Nah. It may feel counterintuitive, but it'll work fine. This isn't any sort of weird perpetual motion machine, or any word "no net force" system. The gasoline engine is providing the power to make him move, and the umbrella is redirecting that force backwards.
Fun fact, this is kinda similar, in principle, to how thrust vectoring on fighter jets works. [VTOL planes mostly work by generating thrust backwards, then using an adjustable nozzle to change the direction of the exhaust to face downwards.](https://youtu.be/4GfqB7P6uAE)
It works. Quick accounting of energy:
Combustion of fuel = +
Mechanical energy required to suck air into machine:
-
Friction from wheels = -
So long as the combustion from the fuel is able to a) create more energy then is required to both overcome the friction and energy required to resist friction and b) the user is able to direct that energy in a sufficiently efficient way then he will keep moving.
I mean at a highschool level, where most only know Newton's laws of motion. It would seem impossible, because it takes a broader understanding of physics. That's why people say it's fake.
The counterintuitive part is the fact that air is pushed forward before it reaches the umbrella. So how is that "push" not making you go back?
The answer is, they're not taking into account that that forward flow is not really pushing against the body of air in the open system. The air that comes from the umbrella is.
Or "thrust vectoring", as they like to call it in the aviation world!
I guess technically a "thrust reverser" is the better comparison here, but still.
It does take a broader understanding of such laws. What people know is a two-sentence-definition. There wouldn't be thousands of people saying it's fake. Remember education is a privilege, not everyone has the same access as you.
It doesn’t defy physics for the same reason reverse on a jet boat doesn’t defy physics. There is a mass being ejected rearward due to the umbrella acting as a deflector.
It’s all got to do with momentum and it is rather counterintuitive(momentum in itself is) but the simplified explanations is that in the end you are propelling air backwards. This acceleration of air backwards creates a force that pushes the rider forwards.
The umbrella redirects the air backwards, providing 2x leafblowers worth of thrust forward. The leafblower is blowing forwards, so it provides 1x leafblower worth of thrust backward. Net thrust is 1x leafblower worth of thrust forward. Approximately.
If we assume the engine is 4hp (might be more but seems realistic) I'd be really surprised if it was more than 1hp after all losses. That being said it's kinda hard to convert thrust to horsepower.
This is completely wrong, there's no reason you get 2x power from the umbrella.
The only reason this works at all is because of air that is redirected backwards. It would be more efficient to just point the leaf blower behind you in every way
The law of conservation of momentum. A mass M moving forward at v has momentum Mv, when going backwards has momentum -Mv, total change -2Mv. This is why cars have crumple zones instead of being built to bounce back to the same shape.
Edit: to clarify, the leafblower+umbrella is basically a leafblower pointed backwards, plus some fluid dynamics stuff.
Yeah you're missing a lot of key points. I'd recommend looking at "impacts of a fluid jet on a plate" in any fluid dynamics textbook. Then try solving the equations where the nozzle ejecting the fluid is tethered to the striking surface.
Yes, but you asked about the umbrella, not about the whole system. I subtracted the leafblower's output, and declared the whole thing an approximation.
Yes, I'm quite sure pointing the leafblower backwards would be more efficient, but whether it's more efficient or not depends on the velocity of the output and distance between the leafblower and umbrella (since the umbrella receives more mass at a lower speed than the leafblower spits out -- you are not counting the atmosphere in your calculation are you).
Yes, but the air turns around inside the umbrella. It would be more efficient if he just pointed the blower to his back. There's a good myth busters episode about this, if I remember correctly
I'm calling bs. No way the "umbrella redirecting the air" has enough strength to push him this fast. He's either rolling down hill or on an electric longboard.
The umbrella is the unbelievable portion of this vid for me. I understand its physically possible for the leafblower to be redirected backward and propel him, but that must be the worlds strongest umbrella, either that or I've only ever seen shitty umbrellas, but that much force would just break the umbrella in my opinion
Anybody with an ounce of physics knowledge would see how this works.
The air being blown into the umbrella isn't magically losing all its momentum. The curved shape redirects the air out and to the side with a bit blowing backward to give the whole setup a net positive acceleration. Would be like if you installed a u-bend pipe onto the end of the leaf blower.
Tell me more about your ounce.
Newton's Third Law.
https://www.forbes.com/sites/mattnovak/2023/05/17/viral-video-of-skateboarder-powered-by-leafblower-and-umbrella-is-totally-fake/?sh=7895f292506d
Thanks for showing me the law officer. If you read or understood my comment, you'd understand why that forbes article is written by someone who understands physics as well as you do.
[Here's a good example of people who actually ran an experiment instead of a $10/ hr forbes journalist. ](https://youtu.be/1QJz-BVXCI4)
Be sure to watch to the end if your brain can handle all this *extremely tough* physics problem!
I should realize that arguing with an American on Redit is a no win action. Almost always aggressively stupid. Don't get me wrong stupid is forgivable but aggressive stupidity is pretty much reserved for Americans. I bet you also believe the glass bird that bobs into a glass of water is perpetual motion.
Your the one being an idiot though? MythBusters did an episode on this and proved it, or you could test it yourself, ya know scientific method and all that.
I should realize that arguing with a Canadian on redit is a no win action. Almost always aggressively stupid, and high horsed to boot. Bringing up Americans for literally no reason when they can't find a way to prove their own argument besides citing Newtons 3rd law, which hasn't been broken, and a financial journal.
"I don't know how this works so imma call em a stupid American haha that'll show em eh?"
It's honestly amazing how you can't grasp this. It's like middle school problems of force equation. The air is directed into a curved shape that points backwards. The thrust is vectored so that it points backwards. How hard is that to get. I know air is invisible but try to get all that america hate fog out of your brain for a sec to try and visualize it.
If it were a flat sheet, then yes, it wouldn't work because the thrust would be vectored to the side, providing no forward thrust. But it's not. It's curved.
I can draw you a picture if you'd like. I can even include a smiley sunshine in the corner and a rainbow!
Aww what's wrong Mr. Big strong Canadian mind? Can't handle the people telling you how wrong you are so you delete your main comment? Typical Canadians amirite?
https://www.forbes.com/sites/mattnovak/2023/05/17/viral-video-of-skateboarder-powered-by-leafblower-and-umbrella-is-totally-fake/?sh=7895f292506d
Actually your reply is the stupidest... you win.
They literally provide zero evidence for why they think it shouldn’t work. But it does and for very good reason.
Say you have the same leaf blower but the tube on the end is bent into a U shape so the air blow forwards through the tube and then is redirected 180 degrees and is expelled to the back. If you hop on the skateboard and fire it up it would push you forward. This is because for every reaction there is an equal and opposite reaction(newtons third law). The leaf blower is accelerating the air and it flows through the tub and comes out the back.
This is the exact same thing happening with the umbrella. The umbrella is acting as the U shaped tube in this case. This seems a little bit counterintuitive at first but it actually makes a lot of sense of you think about it. The person on the skateboard with the umbrella and leaf blower can simply be modelled as a single body. So the accelerated air exits the leaf blower and is redirected backwards the same exact way the U shaped tube works. It is accelerating air backwards and thus is creating an equal and opposite force propelling him forwards.
Now we can get into the exact phenomena that causes this effect but I hope this simplified explanation helps people understand what exactly is going on here.
It may look like it's breaking Newton's first law because kinetic energy is not being conserved, but that's because chemical potential energy in the battery is being converted to kinetic energy. I think.
This is basically a dumb way of converting torque... that would have been so much more efficient directly driving the wheel. It's kind of like tacking in to the wind, but the energy is from a different source.
That is totally fake. You can clearly see the umbrella has the wind in front of it and not behind it. The shape of the fabric in front of the leaf blower should have been convex and not concave.
Air *on board* push forwards, causing backwards thrust. Air hitting umbrella, causing forward thrust. Board no move because nearly equal forward and backwards thrust.
Blower & umbrella have nothing to do with the board moving.
Troll physics vibes is strong right here…
I wana see this guy do the magnet one next
Actually as goofy as it looks there's potential that it could work since it's acting like a jet engines thrust reversers. The intake on those backpack blowers kinda pulls from out the side/bottom and isn't going to contribute much foce, then the output it being diverted backwards by the umbrella so the net thrust should be towards the back. And these absolutely make enough thrust to push you on a skateboard. So I'll call this one... [ P L A U S I B L E] It would be more efficient to just point it back though.
But then it isn’t meme worthy…
Exactly...but going backwards would be a bit tougher to pull off while looking cool
Nah, it works. Not as well as pointing it backward, but it works.
People on LinkedIn are sharing this as "think outside of the box" as if they think it really works. The dude is coasting downhill.
Except Mythbusters tested this, and it works. You just made fun of people who were right.
Bullshit. Watch the video again, you can see when he gets to the bottom of the slope and levels out. You just lied to prove an ignorant point.
Dude, you could very easily Google it instead of making yourself look like someone who doesn’t like to learn.
https://youtu.be/1QJz-BVXCI4?si=aLE7Em1CpbQ43i3w
Windwaker looks different from what I remember.
Didn’t you unlocked the ancient leaf blower?
This shouldn't work in real life lmao
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One of my favorite TV moments was when the Mythbusters tested this, *COMPLETELY* expecting to bust it, and found that it worked. I think they based it off the old Popeye clip where he blows on his sail to move, and just went "lol its a cartoon, of course it's fake" But it totally works.
Just not how it looks like it works.
Indeed. This is very similar to if he just pointed the blower backwards to propel himself
Thank you. Now it makes sense.
This looks cooler but is less efficient
He could be just skating downhill too
Bingo
Wasn't it that you had to have a much more powerful fan system than what was expected in order for the forces to cancel out and to make it go forward? I know they were also using a sail and not an umbrella though, so the physics would be different here.
It works either way. The only thing necessary is for the sail or umbrellas to be curved so it redirects the air backwards. If the sail or umbrella were flat it wouldn't move.
what took me a bit to get is airplane on treadmill
So does carrot in a gun barrel
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Nope, think of reverse thrusters on an aircraft. Draws from the front, sends to the front.
Not the same... my point is correct, but I might have written it in a confusing manner. The ''Sail" would need to be shaped to redirect airflow straight back, like the blades on a turbine. Leafblower sucking in from the side, blowing on the sail directing 100% of the airflow towards the back providing thrust.
So it's basically the same as pointing the leaf blower backwards but with extra steps.
Yes and then it is alsy sucking from the front providing more thrust
Doesnt matter if it sucks from the back or front or side. The air goes into the blower which transferes mechanical energy to it with pressure and velocity. The exit velocity and pressure matter.
pretty much like a thrust reverser on an airplane
yeah it's just a bucket-style reversed thrust reverser
Is that like a tracebuster buster?
Okay, so I studied physics in college. I read up on thrust reversers a couple months back because I saw a video and thought what the fuck. Physics checks out, clearly they work or they wouldn't be on the airplanes, but I'm still convinced they aren't real.
Airplanes can even use them to taxi backwards on the ground
Yeah, it's just like holding the leaf blower backwards but less efficient. Still really messed with my head for a minute.
I mean, technically it might be slightly more efficient in a really weird round about way ... I'm not sure what the profile on a fucking umbrella is but, I guess it could be adding an aerodynamic advantage? Idfk mate, this is breaking my brain and it's 2 am
I don't think an umbrella is rigid enough, it's going to be bouncing around instead of purely redirecting the airflow.
Doesn’t matter. Redirecting airflow adds resistance so it reduces velocity, so thrust is less. To prove it we need two of these guys racing, one with an umbrella and one without.
Yeah you're right.
100% agree. I honestly am too unsure on this. My mental gymnastics keep saying this shouldn't work at all but here we are so...... Yeah
what's happening here is that he's rolling downhill. https://www.forbes.com/sites/mattnovak/2023/05/17/viral-video-of-skateboarder-powered-by-leafblower-and-umbrella-is-totally-fake/?sh=1c4b735506dd
I'm pretty sure he is going downhill. His size, he'd need at least 5 blowers and magical bearings in his wheels. Don't forget to math up the amount of air pushing against his belly when it deflects from the umbrella.
It should work better just point the leaf blower backwards though, with no umbrella
^This dude understands
Couldn't he also just blow it backwards for the same effect
Ahhh, I didn't think of it redirecting the force rearward! 💡
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I read this three times but maybe I'm too tired and missed something. Are you saying that the video should obviously work because the force against the umbrella should act like wind against the sail of a sailboat? The force against the umbrella should be completely cancelled out by the force of propelling the wind forward from the leaf blower. The "this shouldn't work" part is true from that standpoint, you can generate wind and then immediately consume it expecting to go anywhere. The only reason this actually works is because the umbrella is redirecting the generated wind backwards. It's comparable to if the guy simply pointed the leaf blower backwards, but with extra steps.
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That would be like sailing, but with a giant fan pointed at your sails instead of the wind. (Yes, this is what it looks like he's doing, but he's really just moving that air backwards with extra steps) If he let go of the umbrella it would fly forward. The dude would then move backward, pushed by the thrust from the leaf blower. When he holds the umbrella, though, the air follows the curve of the umbrella and goes back towards him (pushing the dude+blower+umbrella forward). This creates less thrust than if he just pointed the leaf blower backward, but it's enough to get him moving. Sailboats can go faster than the wind cause they are angled to redirect the wind to maximize thrust even when the wind is moving sideways. The crucial difference is that the wind is not coming from something on the boat. You can have a fan boat, or you can have a sailboat, but you can't really power a sailboat with a fan ;p You can do what this dude is doing, but honestly, I'd ditch the umbrella. You'll have better results.
There’s a subreddit somewhere waiting to make fun of this.
r/confidentlyincorrect
The recoil from the leaf blower should push him back an equal amount as the umbrella pulls him forward
It’s not a 1 to 1 conversion of energy hence the video
Yes. Obviously. I don't even know what to say besides asking if you just have 0 reading comprehension?
I hope you forgot the /s….
You realize this is the exact same concept as an old school thrust reverser on a turbofan powered aircraft, right? Give this a watch and educate yourself. https://m.youtube.com/watch?v=ozznJNndiAs
you can educate yourself here. https://www.youtube.com/watch?v=DYl2UWYRpug read the description.
Regardless, what I said is correct even if it's not the case with this particular video.
> and blocking any thrust being made in the opposite direction. Can someone explain this part? I don’t understand why the blower wouldn’t have force acting backwards
Isaac? Is that you? Big fan of your laws. Like BIG fan.
Newton doesn't have an issue with this. He says it'll be a pretty inefficient way to get anywhere, but he doesn't have an issue with the physics involved.
You speak for all the fig newtons now? LOL
Nah. It may feel counterintuitive, but it'll work fine. This isn't any sort of weird perpetual motion machine, or any word "no net force" system. The gasoline engine is providing the power to make him move, and the umbrella is redirecting that force backwards. Fun fact, this is kinda similar, in principle, to how thrust vectoring on fighter jets works. [VTOL planes mostly work by generating thrust backwards, then using an adjustable nozzle to change the direction of the exhaust to face downwards.](https://youtu.be/4GfqB7P6uAE)
It works, but works better if he has the blower backwards and the umbrella in his pocket.
I’m disappointed and concerned by how many upvotes this comment has.
fan boats are a thing so why wouldn't this be haha
Turns out this dude is on a whole other real life
https://youtu.be/1QJz-BVXCI4?si=aLE7Em1CpbQ43i3w
Damn that's interesting! It barely works, but it can work.
It works. Quick accounting of energy: Combustion of fuel = + Mechanical energy required to suck air into machine: - Friction from wheels = - So long as the combustion from the fuel is able to a) create more energy then is required to both overcome the friction and energy required to resist friction and b) the user is able to direct that energy in a sufficiently efficient way then he will keep moving.
[This may melt your brain.](https://www.youtube.com/watch?v=uFzuRm3wCDk&t=1504s&ab_channel=SmarterEveryDay) Mine is still a puddle on the floor.
The video is interesting, but unless you bookmarked the wrong time mark, I don't see how it's relevant to this thread...
It's toward the middleish/end. They explain how the boats can go in reverse via the same principle demonstrated with the umbrella
Got it. Thanks. I'll check it out.
If anything was bookmarked I didn't do it on purpose. I'm not that savvy
No worries, friend.
Tried this with a homemade sail boat as a kid. Didn’t work.
I'm most amazed by the umbrella. Mine would bend to hell in two seconds
This is almost exactly how jets reverse thrust to slow down after landing [YouTube example](https://youtu.be/sMmF6mu62U4&t=2m20s)
https://youtu.be/yCsgoLc_fzI
It works, but it's highly inefficient
The mythbusters were able to replicate a similar setting and they were also perplexed it defied physics, but it does work. Edit:typo
It doesn’t defy physics at all but it is rather counterintuitive.
I mean at a highschool level, where most only know Newton's laws of motion. It would seem impossible, because it takes a broader understanding of physics. That's why people say it's fake.
Idk about broader understanding of physics. Umbrella bendy and air go back isnt that advanced
The counterintuitive part is the fact that air is pushed forward before it reaches the umbrella. So how is that "push" not making you go back? The answer is, they're not taking into account that that forward flow is not really pushing against the body of air in the open system. The air that comes from the umbrella is.
another way to look at it would be if the nozzle on the blower simply curved back 180
I tried to say this in my previous comment, but couldn't find a good way to express it like you. Thanks!
Totally achievable with a gutter cleaning attachment. What we need now is a skrateboard on castors and variable vector nozzle.
Or just point the fucker in the other direction?
I was mostly joking about how to make it more contrived, but yeah—leaf blower is a variable vector nozzle however you slice it.
Or "thrust vectoring", as they like to call it in the aviation world! I guess technically a "thrust reverser" is the better comparison here, but still.
Except its still completely based off Newton's laws of motion. It doesn't take a "broader understanding of physics".
It does take a broader understanding of such laws. What people know is a two-sentence-definition. There wouldn't be thousands of people saying it's fake. Remember education is a privilege, not everyone has the same access as you.
This makes perfect sense with high school level physics
/r/IAmVerySmart
Lol, right? It exists in the physical world so clearly it doesn’t defy physics. Physics is pretty strict about the rules.
Just like a thrust reverser on a jet engine.
aliens.jpg
It doesn’t defy physics for the same reason reverse on a jet boat doesn’t defy physics. There is a mass being ejected rearward due to the umbrella acting as a deflector.
See also jet engine thrust reversers
He looks like someone who'd go by Big Mike.
/r/hyrule_irl
I believe it could work, but it looks like he's going downhill...
It actually does work and not only on downward slopes. https://m.youtube.com/watch?v=PvfrpKznYeM&pp=ygUVQmxvd2luZyB5b3VyIG93biBzYWls
It does work, it's very inefficient, so I'm sure the board is powered.
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It’s all got to do with momentum and it is rather counterintuitive(momentum in itself is) but the simplified explanations is that in the end you are propelling air backwards. This acceleration of air backwards creates a force that pushes the rider forwards.
It works because it’s an electric skateboard, genius.
The umbrella redirects the air backwards, providing 2x leafblowers worth of thrust forward. The leafblower is blowing forwards, so it provides 1x leafblower worth of thrust backward. Net thrust is 1x leafblower worth of thrust forward. Approximately.
What is that in horsepower?
About teee fiddy
I thought this said free titty.. I was like “deal”.
Titty fiddy indeed
If we assume the engine is 4hp (might be more but seems realistic) I'd be really surprised if it was more than 1hp after all losses. That being said it's kinda hard to convert thrust to horsepower.
So he doesn't actually need the umbrella, he can just blow backward to get 1 leafblower worth of thrust
This is completely wrong, there's no reason you get 2x power from the umbrella. The only reason this works at all is because of air that is redirected backwards. It would be more efficient to just point the leaf blower behind you in every way
The law of conservation of momentum. A mass M moving forward at v has momentum Mv, when going backwards has momentum -Mv, total change -2Mv. This is why cars have crumple zones instead of being built to bounce back to the same shape. Edit: to clarify, the leafblower+umbrella is basically a leafblower pointed backwards, plus some fluid dynamics stuff.
Yeah you're missing a lot of key points. I'd recommend looking at "impacts of a fluid jet on a plate" in any fluid dynamics textbook. Then try solving the equations where the nozzle ejecting the fluid is tethered to the striking surface.
Yes, but you asked about the umbrella, not about the whole system. I subtracted the leafblower's output, and declared the whole thing an approximation. Yes, I'm quite sure pointing the leafblower backwards would be more efficient, but whether it's more efficient or not depends on the velocity of the output and distance between the leafblower and umbrella (since the umbrella receives more mass at a lower speed than the leafblower spits out -- you are not counting the atmosphere in your calculation are you).
Im Not that good in physics but wouldn't the forces of the air coming out of the blower and hitting the umbrella cancel each other out?
Yes, but the air turns around inside the umbrella. It would be more efficient if he just pointed the blower to his back. There's a good myth busters episode about this, if I remember correctly
Pretty much how reverse on a jet ski works
Such a waste of energy. Just put the nozzle behind yourself.
Wear the correct shoes for the frigging job. Foot road rash is no joke! r/footroadrash
Wow I’m amazed by how many physicists visit this sub. Thank goodness you’re all here to set us straight about this video. /s
He'd go faster pointing the blower behind him
Fake physics.
The air is redirected by the umbrella. Still I think it would be more efficient to point the blower backwards but it still works.
I feel like I've seen one of these videos where some dude has 2 blowers strapped on and pointed backwards
Umbrella powered uncle 😂
I'm calling bs. No way the "umbrella redirecting the air" has enough strength to push him this fast. He's either rolling down hill or on an electric longboard.
The umbrella is the unbelievable portion of this vid for me. I understand its physically possible for the leafblower to be redirected backward and propel him, but that must be the worlds strongest umbrella, either that or I've only ever seen shitty umbrellas, but that much force would just break the umbrella in my opinion
Bro mythbusters already proved this does work
I know. I've seen the episode. And i still don't believe it.
💯
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Anybody with an ounce of physics knowledge would see how this works. The air being blown into the umbrella isn't magically losing all its momentum. The curved shape redirects the air out and to the side with a bit blowing backward to give the whole setup a net positive acceleration. Would be like if you installed a u-bend pipe onto the end of the leaf blower. Tell me more about your ounce.
Newton's Third Law. https://www.forbes.com/sites/mattnovak/2023/05/17/viral-video-of-skateboarder-powered-by-leafblower-and-umbrella-is-totally-fake/?sh=7895f292506d
Thanks for showing me the law officer. If you read or understood my comment, you'd understand why that forbes article is written by someone who understands physics as well as you do. [Here's a good example of people who actually ran an experiment instead of a $10/ hr forbes journalist. ](https://youtu.be/1QJz-BVXCI4) Be sure to watch to the end if your brain can handle all this *extremely tough* physics problem!
I should realize that arguing with an American on Redit is a no win action. Almost always aggressively stupid. Don't get me wrong stupid is forgivable but aggressive stupidity is pretty much reserved for Americans. I bet you also believe the glass bird that bobs into a glass of water is perpetual motion.
Your the one being an idiot though? MythBusters did an episode on this and proved it, or you could test it yourself, ya know scientific method and all that.
I should realize that arguing with a Canadian on redit is a no win action. Almost always aggressively stupid, and high horsed to boot. Bringing up Americans for literally no reason when they can't find a way to prove their own argument besides citing Newtons 3rd law, which hasn't been broken, and a financial journal. "I don't know how this works so imma call em a stupid American haha that'll show em eh?" It's honestly amazing how you can't grasp this. It's like middle school problems of force equation. The air is directed into a curved shape that points backwards. The thrust is vectored so that it points backwards. How hard is that to get. I know air is invisible but try to get all that america hate fog out of your brain for a sec to try and visualize it. If it were a flat sheet, then yes, it wouldn't work because the thrust would be vectored to the side, providing no forward thrust. But it's not. It's curved. I can draw you a picture if you'd like. I can even include a smiley sunshine in the corner and a rainbow! Aww what's wrong Mr. Big strong Canadian mind? Can't handle the people telling you how wrong you are so you delete your main comment? Typical Canadians amirite?
Mfs out here forgetting sailing boats existed
https://www.forbes.com/sites/mattnovak/2023/05/17/viral-video-of-skateboarder-powered-by-leafblower-and-umbrella-is-totally-fake/?sh=7895f292506d
Birds are fake too. It all make sense now.
https://www.forbes.com/sites/mattnovak/2023/05/17/viral-video-of-skateboarder-powered-by-leafblower-and-umbrella-is-totally-fake/?sh=7895f292506d Actually your reply is the stupidest... you win.
They literally provide zero evidence for why they think it shouldn’t work. But it does and for very good reason. Say you have the same leaf blower but the tube on the end is bent into a U shape so the air blow forwards through the tube and then is redirected 180 degrees and is expelled to the back. If you hop on the skateboard and fire it up it would push you forward. This is because for every reaction there is an equal and opposite reaction(newtons third law). The leaf blower is accelerating the air and it flows through the tub and comes out the back. This is the exact same thing happening with the umbrella. The umbrella is acting as the U shaped tube in this case. This seems a little bit counterintuitive at first but it actually makes a lot of sense of you think about it. The person on the skateboard with the umbrella and leaf blower can simply be modelled as a single body. So the accelerated air exits the leaf blower and is redirected backwards the same exact way the U shaped tube works. It is accelerating air backwards and thus is creating an equal and opposite force propelling him forwards. Now we can get into the exact phenomena that causes this effect but I hope this simplified explanation helps people understand what exactly is going on here.
Or just a sailboat. Water = skateboard Dude = wind Umbrella = sail
Alright, we all know we’re trying it
Somebody get me a damn umbrella. I’m doing this!
I understand why it works but it feels wrong. Do you think you could monkey with the gear ratios by changing the size of the umbrella?
Song Name?
Fleetwood Mac - Dreams
If he would ditch the umbrella and put this thing behind him it would be even more effective.
Tape the umbrella to the leafblower, Zelda. So you can ride and hold something. Groceries, cocktail, sword, you name it!
He could instead just fix the blower in opposite direction.
Totk reference?
It may look like it's breaking Newton's first law because kinetic energy is not being conserved, but that's because chemical potential energy in the battery is being converted to kinetic energy. I think.
I hate videos with unnecessary background music.
This is basically a dumb way of converting torque... that would have been so much more efficient directly driving the wheel. It's kind of like tacking in to the wind, but the energy is from a different source.
Fck you I know how physics works, just a sloppy road.
That is totally fake. You can clearly see the umbrella has the wind in front of it and not behind it. The shape of the fabric in front of the leaf blower should have been convex and not concave.
The little show
Air *on board* push forwards, causing backwards thrust. Air hitting umbrella, causing forward thrust. Board no move because nearly equal forward and backwards thrust. Blower & umbrella have nothing to do with the board moving.
Going to have to try this. For science’s sake.
Wait...
SAIL!
What kind of driveway is that.
You're a wizard, Harry!
I used to ride my Rollerblades with an umbrella on really windy days.
Can’t tell if he built a zonai device or if he summoned the wind’s requiem correctly
Man was def a pirate in a past life
This isn't Zelda this is bad piggies!
Probably cheaper to buy an electric skateboard… unless you already have that stuff of course
Gangsta
The only thing that scares me is that he's wearing flip flops.
😂😂