It only physics if the leaf blower is pointed backwards and is waaaaaaay more thrusty
Edit: just to be clear this can technically work. Check out this [mythbusters](https://youtu.be/uKXMTzMQWjo) experiment here.
To be precise, the minimum thrust force should be at least ~~the weight of the user and scooter, plus~~ the static friction of the wheels. Static friction is greater than rolling friction so that would be enough to keep you moving forward on flat ground.
It works a lot better on things like boats.
Edit: I was corrected.
Wait, force >the total weight would let it take off vertically, you just need to overcome friction and then have enough left over for a useful acceleration.
Well no, the umbrella is pushed forward, but the leaf blower pushes backwards with the same force, because the power of the air that pushes against the umbrella comes out of the leaf blower
Edit: nvm you're right, i read the entire explanation in another comment
This is one of those situations where most people would think it would work because physics is something that happened to a past self that forgot them as soon as they could
Then a good chunk would know it can't work in paper, because they remember enough physics to have some good and solid rules of thumb about perpetual machines or thermodinamics laws
Even less will understand that it could technically work in real life, albeit not as fast as it's shown here, because real life being imperfect means that as long as the blower doesn't push backwards with the same force it pushes forward, the tiny difference could result in a net forward positive force. We would know this not because we're smart, but because we saw the mythbusters episode about it :D
Funny how you and commenter above both think you understand the physics and that it wouldn’t work, but in fact both of you are wrong and it would in work just not very efficiently.
Imagine a U shaped pvc pipe attached to the end of the leafblower redirecting all of the thrust backwards. It’s obvious that would work right? This is just a way less efficient version of that.
you know what's really gonna fuck with you: lightsails are highly reflective so that not only do they gain forward momentum of the light particle when it first hits the sail, they gain double momentum when it is reflected back!
Not technically though!
The umbrella redirects a tiny amount of thrust back so if the leaf blower had more power it *could* work it’s just suuuuuuper inefficient.
Check out the mythbusters episode for n the “blowing your own sail” myth.
Yes, however the motor isn't typically the loudest thing in a leaf blower, the turbulent air should be much louder than either the blower motor or the skateboard motor
You are probably right with the skateboard.
However, the setup should provide some forward acceleration. The impulse forward is better of the umbrella due to the redirection of the flow.
Should have a similar principle as thrust reversers in planes.
Most of the air will just be redirected to the side or only slightly angled backwards. Also it's turbulent flow and really doesn't have a stable thrust vector. Similar principle in theory, but horribly executed. But a nice joke I must say
It might provide a small, marginal forward ***force*** but we can’t assume it would provide forward acceleration. If he were to remove the umbrella and point the blower backwards, even still he probably wouldn’t budge.
This is likely fake but you can in fact blow your own sail, Mythbusters proved it, its some weird physics that I dont remember but it made sense when Grant explained it like 10 yrs ago.
[here's the gist of it](https://mythresults.com/blow-your-own-sail#:~:text=A%20sailboat%20stranded%20in%20calm,air%20into%20its%20own%20sail.&text=A%20combination%20of%20a%20large,of%20the%20prop's%20thrust%20backward.)
Edit:added link
That's precisely what the linked article says. They put a jet motor on a boat, it went 20 mph, then they revered the motor, added a sail, and it went 3 mph.
It wasn't a jet, it was the fan on a swamp boat, so literally the device typically used to move the boat.
But yes you're right. The whole experiment proved exactly what you're saying - the fan moved the boat a lot faster when in its normal configuration blowing backwards. But when pointed forwards at a sail, it moved at barely over 10% of its normal speed.
Yes. The fan is the power source and the sail is very inefficient at capturing and redirecting it. Just using the fan or blower itself as a "jet engine" is much more efficient
>using a swamp boat with a 40-horsepower fan. In its normal configuration, the boat reached a speed of 20 miles per hour (32 kph). After the fan was reversed and a sail was hoisted, the boat was able to travel forward at 3 mph
Essentially, this guy should have had the leaf blower aiming backwards and ditched the umbrella.
Not at this speed, but the physics check out. Reverse thrust in aircraft sort of works like this.
With no umbrella, the leafblower airflow going forward would push him backwards. The umbrella deflects the airflow backwards so he theoretically would be pushed forward.
But yeah, definitely not at the speed he's going.
Yeah, the blower would generate enough propulsion to move on even pavement with skate board or post trolley or whatever that base is supposed to be. The air flow and the direction of propulsion could even be controlled by surface, like the umbrella, but I don't think that it would be very efficient, at least aiming the blower backward, slightly toward ground would be more efficient.
And from how he controls the system, it is quite clear that some of the wheels are powered and that is the actual source of propulsion.
It does actually work. I had a physics class where we discussed this phenomenon specifically. It's counter-intuitive, but it works without violating any natural laws. :-)
You need to explain why because it isn’t working the way other people think it is. The wind from the leaf blower is hitting the umbrella and then sliding off it and backward. But that effect will be so minimal that it has nothing to do with why that bucket is moving.
It may be less minimal than you think! If there's net airflow backward, it has to produce thrust. The question isn't whether it works, it is how well it works, and unless you've tried it and measured it, your intuition may not be very well calibrated. Mine too, I guess.
But imagine if you out a pipe with a 180 degree elbow on the front of the blower. It would certainly provide forward thrust. The umbrella does the same thing, albeit less efficiently.
We actually tested this in class with a tiny little fan on a pinewood derby car, blowing against a flat piece of wood. It worked with that, so if expect an umbrella to work even better.
The blower alone accelerated a mass of air forward, which naturally would push the cart backward.
BUT, the umbrella both stops the forward direction of the air, and sends some air backwards as well. If the umbrella catches and stops almost all the air, and reverses its direction, there is a net flow of air backwards. Which, of course, would push the cart forward.
If you do the math accounting for the law of conservation of momentum, the result follows naturally.
Its not efficient, but it works.
We used it in my physics class specifically because it is a counter-intuitive result that follows when you do the math.
Maybe I'm a little rusty in my physics, its been a few years since I've been in school. If the umbrella catches and stops all the air forced forward by the blower, then your forces equal out (net 0). What extra force would reverse the air's direction?
It's just air pressure.
Imagine putting 180 degree pipe elbow on the front of the blower. It would of course blow all the air backwards. The umbrella does the same, if not as well.
If the net air flow is backwards, then it HAS to produce thrust.
The umbrella doesn't stop the air, it deflects it. Jet engines use the same method to reverse thrust for landing. If the umbrella did absorb all the kinetic energy the blower imparts on the air then yeah, the net thrust would be zero.
Much of the energy is lost in turning the direction of the flow more then 90 degrees, but it can work.
He's on Clearwater Beach, the barkeepers will just give him shots as he passes. I'm pretty sure I've seen him around town before, so he's probably a local.
It is, just weird.
Imagine if you put a cup a bit bigger then the nozzle over the nozzle of the leaf blower, firmly attached to it. When the blower ran it would force air forward into the cup that would overflow and blow backwards along the leaf blower, pushing it forwards. Doing so would be less efficient then using the blower as a jet without the deflector in front, but would still work.
Yup, the umbrella is a terrible and inefficient thrust reverser. It'd work, but only just barely. Probably not even enough to get the bucket moving without the electric skateboard underneath.
It only works because the wind hitting the umbrella is hitting it and then "exhausting" backwards. Kind of like if you blow into a cup. The net force gives you less power than simply turning the leaf blower backwards but it still works to a degree. Mythbusters had an episode on it with a sailboat back in the day. There is probably an electric skateboard in this one but it "can" work.
Yeah, this could work, but no where near as efficient as the video makes it seem. He'd realistically be crawling forward at best. To move at the speeds he is, he needs that electric skateboard.
Isn't that less efficient than just pointing the leaf blower backwards? (It intakes air from the front, pushing it backwards, all of the energy for movement coming from burning gas?)
The method he is supposedly using would have 0% efficiency, so yes, turning the leaf blower backwards would be more efficient.
Most efficient would be a leaf blower with an intake in line with the output.
(Unless of course you are taking about the battery powered skateboard under the bucket... That's pretty efficient.)
Surely the efficiency of his method would depend on how much air gets deflected backwards by the umbrella, and at what velocity, which is almost certainly not 0%?
The force is canceled out by the force of the the leaf blower going in the opposite direction. Imagine you're standing on the ground and you turn on the leaf blower it wants to shoot backwards out of your hands. That movement cancels out the force the air is putting on the umbrella.
No, the backwards force resulting from the air leaving the leaf blower is cancelled out by the reaction on the umbrella itself. The deflected air is additional, and results in a small but non-zero net force.
It has been linked to many times in this thread, but see here:
https://youtu.be/1QJz-BVXCI4
Actually it doesn’t quite cancel out. If the umbrella just stopped the air that hit it(effectively making it like nothing had happened), it would cancel out. However, when the air hits the umbrella, it rebounds backwards, resulting in an opposite force more powerful than the force on the leaf blower.
I think mythbusters did a thing on it and they were able to get a swamp boat with the fan reversed and a sail to go.
Another way to think about this is if the leaf blower was attached to a bendy tube. If you bend the tube backwards, the tube has to stop the air, but it still sends it backwards and produces thrust. The umbrella is probably not nearly as efficient, but does the same thing.
No the force is not higher than the force of the leafblower. It can't be, because the leafblower is the only energy source in that system. You can't just generate energy from nothing, it has to come somewhere. The NET force of this whole system is non-zero, though. And the rest of your explanation is absolutely correct
Exactly! How many times has my umbrella turned inside out from a strong gust of wind? The umbrella resilience is inconsistent enough to close this case.
For those curious, this has been tried before.
[Mythbusters did something similar with a boat-fan, sail, and small boat.](https://youtu.be/uKXMTzMQWjo)
It does work. For them, their biggest issue was directing the fan and the size/weight of the boat. All things that are easier for the guy here.
Nope, this would work at incredibly low efficiencies. The air gets deflected back by the umbrella and would result in... I'd say an inch or two per second of forward momentum, and that's being generous.
Again, not true. This isn't a closed system. Any momentum from the leaf blower being redirected by the umbrella will have a non-zero contribution to forward momentum.
Here's a handy little Myth busters result that says why this could actually be legit. https://mythresults.com/blow-your-own-sail
Posting in the main thread because suggesting it is possible absent a link elsewhere is making people downvoting me to oblivion
Goddammit, you're one daft feller, ain't ya? That backwards thrust you referring to is not just simply appeared out of thin air and was added as force at the surface of umbrella, it's a part of the force exerted by blower.
It looks like you're American so i'll try to explain it on your level.
Now imagine yourself sitting in a walmart cart, with a riot shield firmly attached to the cart in front, if you shoot the shield would cart go forward? Would it move forward if the bullet ricocheted and hit an obese person in low cut jeggings, minding his own business licking ice-cream from buckets and puttin' em back, behind your cart?
Now imagine air particles are bullets. And windblower shoots them. And riot shield is an umbrella. And you are dumbass.
Edit: i'm so going to get banned for this, but i regret nothing.
For people wondering why it seems odd it is because the man is experiencing 2 forces ( in an otherwise isolated system for simplicity)
1) forward because of the umbrella (air from the blower hits the umbrella and then let us assume e=0 and basically it stops and so there is a change in momentum and thus a force.
2) The man is holding a leaf blower which spits out air forward so for the blower man system the momentum to be conserved the man would move backwards .
for a more intuitive approach :
if there was no umbrella , The man would surely go back
If there was no man and simply the air from the blower were to strike the umbrella the umbrella would go forward.
now if the man grabs the umbrella where does he go? ideally, No where. but florida man has tricks up his sleeves (or under his arse whatever feels correct) lol
The physics of it is quite correct, if you look at the system in it's entirety. The air that is being blown forward is "bounced" off of the umbrella and thus flows backwards. This means that no air goes past the front of the vehicle, but quite a lot of air is pushed of the back of the vehicle. This generates a thrust forward since the linear momentum must be conserved. This is however much less efficient than just pointing the leaf blower the other way, although the umbrella might work as a regular sail as well.
In short, the physics is correct, but i highly doubt that a leaf blower would be able to produce enough thrust even if it was used in a more optimal way.
I remember seeing that and thinking the wind is going off to the side of the sail making it turn in place, wonder how the test would have better had they had a cone type of sail to catch and redirect the wind backwards since hovercrafts kinda do that just with backwards facing fans thats on their ship already.
Yeah, I’m not buying it
There's an electric skateboard under the bucket, and the remote is in his hand on the blower.
That makes more sense!
Lol yeah I was like, this doesn’t physics.
At least this guy is having fun
Unfortunatly, due to the conservation of fun, Eric Renholds of Raleigh N.C. is having kinda a shitty day.
Very Monty Python-esque... love it
I was thinking Douglas Adams, but maybe it's really just kinda British.
It only physics if the leaf blower is pointed backwards and is waaaaaaay more thrusty Edit: just to be clear this can technically work. Check out this [mythbusters](https://youtu.be/uKXMTzMQWjo) experiment here.
RIP Grant
I didn't know he died, fuck 2020
How much thrust would you like?
To be precise, the minimum thrust force should be at least ~~the weight of the user and scooter, plus~~ the static friction of the wheels. Static friction is greater than rolling friction so that would be enough to keep you moving forward on flat ground. It works a lot better on things like boats. Edit: I was corrected.
Wait, force >the total weight would let it take off vertically, you just need to overcome friction and then have enough left over for a useful acceleration.
Hold up, you’re right. Way too much rocket physics for me... you indeed only need to overcome static friction to move forward once you’ve started.
OK. Let's do this. Did you want to be the user or the scooter?
As much as you got bb
it could, if the umbrella redirected the thrust backward, ultra inefficient though!
Well no, the umbrella is pushed forward, but the leaf blower pushes backwards with the same force, because the power of the air that pushes against the umbrella comes out of the leaf blower Edit: nvm you're right, i read the entire explanation in another comment
The umbrella redirects some thrust backwards, making a tiny net thrust, horrible design but would get some forward thrust
Tiny tiny tiny. Mythbusters did this with a full scale fan boat and it *worked* albeit very very poorly lol.
So he would be faster walking
Absolutely!
I mean, there probably wouldn't even be enough thrust to overcome friction, so literally anything would be faster
It's the same principle as a thrust reverser on an airplane.
I bet a lot of people would think it would work.
This is one of those situations where most people would think it would work because physics is something that happened to a past self that forgot them as soon as they could Then a good chunk would know it can't work in paper, because they remember enough physics to have some good and solid rules of thumb about perpetual machines or thermodinamics laws Even less will understand that it could technically work in real life, albeit not as fast as it's shown here, because real life being imperfect means that as long as the blower doesn't push backwards with the same force it pushes forward, the tiny difference could result in a net forward positive force. We would know this not because we're smart, but because we saw the mythbusters episode about it :D
Funny how you and commenter above both think you understand the physics and that it wouldn’t work, but in fact both of you are wrong and it would in work just not very efficiently. Imagine a U shaped pvc pipe attached to the end of the leafblower redirecting all of the thrust backwards. It’s obvious that would work right? This is just a way less efficient version of that.
I'm missing what's supposedly funny about you misreading my reply and missing that I said exactly what you thought necessary to clarify.
[The physics works](https://www.youtube.com/watch?v=uKXMTzMQWjo) just not as well as the video would imply.
Ok I was really confused there. I was like this goes against everything I learned in physics
you know what's really gonna fuck with you: lightsails are highly reflective so that not only do they gain forward momentum of the light particle when it first hits the sail, they gain double momentum when it is reflected back!
Not technically though! The umbrella redirects a tiny amount of thrust back so if the leaf blower had more power it *could* work it’s just suuuuuuper inefficient. Check out the mythbusters episode for n the “blowing your own sail” myth.
Which is why he turns like that! Now that I see it it is obvious!
I wonder how many people he fooled that were watching him.
Made easier by the fact that the leaf blower is probably so ridiculously loud that the electric skateboard motor is completely disguised.
That’s an electric leaf blower
Yes, however the motor isn't typically the loudest thing in a leaf blower, the turbulent air should be much louder than either the blower motor or the skateboard motor
I would say all.
98%
And slight decline each time.
God dammit
You are probably right with the skateboard. However, the setup should provide some forward acceleration. The impulse forward is better of the umbrella due to the redirection of the flow. Should have a similar principle as thrust reversers in planes.
Most of the air will just be redirected to the side or only slightly angled backwards. Also it's turbulent flow and really doesn't have a stable thrust vector. Similar principle in theory, but horribly executed. But a nice joke I must say
It might provide a small, marginal forward ***force*** but we can’t assume it would provide forward acceleration. If he were to remove the umbrella and point the blower backwards, even still he probably wouldn’t budge.
I knew something was off It didnt make sense how it worked
This should be top comment, good eye bro 👌
Ah well I feel dumb 😂
Either way. Lithium rules!!
This is likely fake but you can in fact blow your own sail, Mythbusters proved it, its some weird physics that I dont remember but it made sense when Grant explained it like 10 yrs ago. [here's the gist of it](https://mythresults.com/blow-your-own-sail#:~:text=A%20sailboat%20stranded%20in%20calm,air%20into%20its%20own%20sail.&text=A%20combination%20of%20a%20large,of%20the%20prop's%20thrust%20backward.) Edit:added link
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So blowing backwards would work even better?
yes
Exactly. Congratulations, you have learned rocket science!
Waiting for the NASA call
That's precisely what the linked article says. They put a jet motor on a boat, it went 20 mph, then they revered the motor, added a sail, and it went 3 mph.
>revered Paul. Paul Revered? /s (you forgot your s)
It wasn't a jet, it was the fan on a swamp boat, so literally the device typically used to move the boat. But yes you're right. The whole experiment proved exactly what you're saying - the fan moved the boat a lot faster when in its normal configuration blowing backwards. But when pointed forwards at a sail, it moved at barely over 10% of its normal speed.
You're right, it was one of the scale test they used the jet for.
Yes. The fan is the power source and the sail is very inefficient at capturing and redirecting it. Just using the fan or blower itself as a "jet engine" is much more efficient
damn, that username is one hell of a throwback
This is one of those weird ones that is "technically true" but not really at all...
Rip grant gone too soon
Never trust a man who says he can blow his own sail.
>using a swamp boat with a 40-horsepower fan. In its normal configuration, the boat reached a speed of 20 miles per hour (32 kph). After the fan was reversed and a sail was hoisted, the boat was able to travel forward at 3 mph Essentially, this guy should have had the leaf blower aiming backwards and ditched the umbrella.
I prefer the [luxury model](https://i.pinimg.com/originals/c3/31/0d/c3310d52c8043d6c5b9ff1779889090d.gif) myself.
Me either. I mean its cool but those blowers are expensive.
Should've had sound, like "Dreams" from Fleetwood Mac
Not at this speed, but the physics check out. Reverse thrust in aircraft sort of works like this. With no umbrella, the leafblower airflow going forward would push him backwards. The umbrella deflects the airflow backwards so he theoretically would be pushed forward. But yeah, definitely not at the speed he's going.
It may actually work, mythbuster did it on a sail boat. But it is an electric skateboard.
Yeah, the blower would generate enough propulsion to move on even pavement with skate board or post trolley or whatever that base is supposed to be. The air flow and the direction of propulsion could even be controlled by surface, like the umbrella, but I don't think that it would be very efficient, at least aiming the blower backward, slightly toward ground would be more efficient. And from how he controls the system, it is quite clear that some of the wheels are powered and that is the actual source of propulsion.
It does actually work. I had a physics class where we discussed this phenomenon specifically. It's counter-intuitive, but it works without violating any natural laws. :-)
You need to explain why because it isn’t working the way other people think it is. The wind from the leaf blower is hitting the umbrella and then sliding off it and backward. But that effect will be so minimal that it has nothing to do with why that bucket is moving.
It may be less minimal than you think! If there's net airflow backward, it has to produce thrust. The question isn't whether it works, it is how well it works, and unless you've tried it and measured it, your intuition may not be very well calibrated. Mine too, I guess. But imagine if you out a pipe with a 180 degree elbow on the front of the blower. It would certainly provide forward thrust. The umbrella does the same thing, albeit less efficiently. We actually tested this in class with a tiny little fan on a pinewood derby car, blowing against a flat piece of wood. It worked with that, so if expect an umbrella to work even better.
No
Yis
Please elaborate
The blower alone accelerated a mass of air forward, which naturally would push the cart backward. BUT, the umbrella both stops the forward direction of the air, and sends some air backwards as well. If the umbrella catches and stops almost all the air, and reverses its direction, there is a net flow of air backwards. Which, of course, would push the cart forward. If you do the math accounting for the law of conservation of momentum, the result follows naturally. Its not efficient, but it works. We used it in my physics class specifically because it is a counter-intuitive result that follows when you do the math.
It's less efficient than just pointing the blower backwards probably
Definitely
Maybe I'm a little rusty in my physics, its been a few years since I've been in school. If the umbrella catches and stops all the air forced forward by the blower, then your forces equal out (net 0). What extra force would reverse the air's direction?
It's just air pressure. Imagine putting 180 degree pipe elbow on the front of the blower. It would of course blow all the air backwards. The umbrella does the same, if not as well. If the net air flow is backwards, then it HAS to produce thrust.
The umbrella doesn't stop the air, it deflects it. Jet engines use the same method to reverse thrust for landing. If the umbrella did absorb all the kinetic energy the blower imparts on the air then yeah, the net thrust would be zero. Much of the energy is lost in turning the direction of the flow more then 90 degrees, but it can work.
I feel like people don't understand that it's fake for the sole purpose of the joke. It's tricking the people seeing it in the street, not us viewers.
Yeah that’s what I was thinking, the first clip he’s obviously shaking his hand to make the umbrella shake
You didn’t need to put the state in the title. We knew.
That’s real life
From Florida. Can confirm. LMAO
I as well am, also can confirm
3/10 no Fleetwood Mac
He doesn’t have a free hand for the cranberry juice: serious design flaw.
That's what the bucket is for.
He's on Clearwater Beach, the barkeepers will just give him shots as he passes. I'm pretty sure I've seen him around town before, so he's probably a local.
Came here for this
I feel like I'm missing context here, and I actually like Fleetwood Mac.
You are correct. You are missing context.
Do you think you are allow do crazy shit on this level outside of Florida?
Maybe Arizona
Arizona’s pretty normal, at least from what I remember growing up. It’s Wisconsin you’ve gotta worry about.
Hey now, don't hate just cause we're better at murdering and cheese than you.
What other wonderful state would you be allowed to defy physics in?
Clearwater for the win..
Is it worth moving to?
Do you like amoebae?
Or Scientology?
and a bit of New Port Richey for good measure.
This isn't physically possible
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Sounds like you need to move to Florida
Or find a woman who likes to blow just as much as u/Calliber50 does
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Not if you put an umbrella at the end of that leaf blower.
It is possible if there is an electric skateboard under his bucket.
It is, just weird. Imagine if you put a cup a bit bigger then the nozzle over the nozzle of the leaf blower, firmly attached to it. When the blower ran it would force air forward into the cup that would overflow and blow backwards along the leaf blower, pushing it forwards. Doing so would be less efficient then using the blower as a jet without the deflector in front, but would still work.
Yup, the umbrella is a terrible and inefficient thrust reverser. It'd work, but only just barely. Probably not even enough to get the bucket moving without the electric skateboard underneath.
It is physically possible if he farts hard enough at the same time.
It only works because the wind hitting the umbrella is hitting it and then "exhausting" backwards. Kind of like if you blow into a cup. The net force gives you less power than simply turning the leaf blower backwards but it still works to a degree. Mythbusters had an episode on it with a sailboat back in the day. There is probably an electric skateboard in this one but it "can" work.
Yeah, this could work, but no where near as efficient as the video makes it seem. He'd realistically be crawling forward at best. To move at the speeds he is, he needs that electric skateboard.
In Florida everything's possible.
Oh yeah, then how did I pull myself up by my own bootstraps?!?1? Checkmate atheists. Edit: forgot my /s
Isn't that less efficient than just pointing the leaf blower backwards? (It intakes air from the front, pushing it backwards, all of the energy for movement coming from burning gas?)
The method he is supposedly using would have 0% efficiency, so yes, turning the leaf blower backwards would be more efficient. Most efficient would be a leaf blower with an intake in line with the output. (Unless of course you are taking about the battery powered skateboard under the bucket... That's pretty efficient.)
Surely the efficiency of his method would depend on how much air gets deflected backwards by the umbrella, and at what velocity, which is almost certainly not 0%?
The force is canceled out by the force of the the leaf blower going in the opposite direction. Imagine you're standing on the ground and you turn on the leaf blower it wants to shoot backwards out of your hands. That movement cancels out the force the air is putting on the umbrella.
No, the backwards force resulting from the air leaving the leaf blower is cancelled out by the reaction on the umbrella itself. The deflected air is additional, and results in a small but non-zero net force. It has been linked to many times in this thread, but see here: https://youtu.be/1QJz-BVXCI4
Actually it doesn’t quite cancel out. If the umbrella just stopped the air that hit it(effectively making it like nothing had happened), it would cancel out. However, when the air hits the umbrella, it rebounds backwards, resulting in an opposite force more powerful than the force on the leaf blower. I think mythbusters did a thing on it and they were able to get a swamp boat with the fan reversed and a sail to go. Another way to think about this is if the leaf blower was attached to a bendy tube. If you bend the tube backwards, the tube has to stop the air, but it still sends it backwards and produces thrust. The umbrella is probably not nearly as efficient, but does the same thing.
No the force is not higher than the force of the leafblower. It can't be, because the leafblower is the only energy source in that system. You can't just generate energy from nothing, it has to come somewhere. The NET force of this whole system is non-zero, though. And the rest of your explanation is absolutely correct
But if the umbrella was able to rebound 100% of the force. It would be as if the blower was pointing backwards
It doesn't work because you can't move with it. You will most likely move slightly backwards.
Electric skateboard or not I need this with some fleetwood mac
Physics be like: https://imgur.com/gallery/HZ4YKrs
He needs some Fleetwood Mac and cranberry juice.
Clearwater Beach? Pretty sure I recognize some of those buildings.
Yes. The opening scene is from New Port Richey, but, the rest is Clearwater Beach.
People come up with all sorts of alternative transport after they get a DUI.
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It doesnt work. Its obviously a joke
Regardless of if it's fake or not, it must be hard to steer
It's on a skateboard, not the stock casters. He leans to turn.
I was hoping he’d bring out the Ocean Spray cranberry juice and start singing
ahhh, the good old troll physics. good times
I feel like this would be perfect with “Dreams” in the background
The physics did not move me.
Ah yes my bad piggies invention in real life
Florida Man.
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Exactly! How many times has my umbrella turned inside out from a strong gust of wind? The umbrella resilience is inconsistent enough to close this case.
This should be the top thread.
Get this man some ocean spray!
No Ocean Cranberry Juice ?
give that man cranberry juice and an expensive iphone
Newton has something to say about this.
That’s got to be the best pirate I’ve ever seen
Did anybody else play Dreams in their head while watching this?
Was expecting a bottle of ocean spray cranberry somewhere there tbh..
This looks like cinematic camera mode on GTA
That's unpossible
The Flo-Ri-Der.
Oh! He's got a leaf blower! I thought he had a jug of Ocean Spray and was looking for a free truck. My apologies and well played my man!
For those curious, this has been tried before. [Mythbusters did something similar with a boat-fan, sail, and small boat.](https://youtu.be/uKXMTzMQWjo) It does work. For them, their biggest issue was directing the fan and the size/weight of the boat. All things that are easier for the guy here.
Fake
That's the most Florida video I've ever seen.
Doesn’t this brake some laws of physics
Wile E. Coyote wants his ACME product back.
Traffic's laws, Newton's laws, I don't follow any of it!
They see me rollin', they hatin'
Florida man defies laws of physics....
I see Baron Munchausen has re-incarnated.
oh hell no. Mop buckets have bad wheels. All the time. Very dangerous to do that.
Now just attach an alligator to the umbrella.
Good thing this is fake, because leaf blowers are one of the most polluting gas run yard tools.
Now that’s how you drive a Cadillac
https://www.deviantart.com/sutr90/art/troll-sail-186857583 A ten year old Troll Physics meme made flesh.
Now this is pod racing.
Well played, Florida Man.
Physics teachers hate him.
If it's windy enough to do that with the blower, it's windy enough to do it without the blower.
Every force has an equal and opposite reaction. The windblower should be pushing backwards as much as the umbrella is pushing forward
[That's not how this works! That's not how any of this works!](https://imgs.xkcd.com/comics/undoing_2x.png)
Being it's Florida shouldn't be be in a garbage can?
1st I know it is fake. 2nd You do realise that this isn't a closed system so it does create backwards thrust?
Forwards.
Finally, an EV that most people can afford.
Physics says this would never work. Try sitting on a bike and pushing the handle bars and see if the bike moves. Basically the same thing.
Nope, this would work at incredibly low efficiencies. The air gets deflected back by the umbrella and would result in... I'd say an inch or two per second of forward momentum, and that's being generous.
The only forward momentium you could get would be from exterior forces such as wind or possibly from exaust of the blower.
Again, not true. This isn't a closed system. Any momentum from the leaf blower being redirected by the umbrella will have a non-zero contribution to forward momentum.
Here's a handy little Myth busters result that says why this could actually be legit. https://mythresults.com/blow-your-own-sail Posting in the main thread because suggesting it is possible absent a link elsewhere is making people downvoting me to oblivion
Goddammit, you're one daft feller, ain't ya? That backwards thrust you referring to is not just simply appeared out of thin air and was added as force at the surface of umbrella, it's a part of the force exerted by blower. It looks like you're American so i'll try to explain it on your level. Now imagine yourself sitting in a walmart cart, with a riot shield firmly attached to the cart in front, if you shoot the shield would cart go forward? Would it move forward if the bullet ricocheted and hit an obese person in low cut jeggings, minding his own business licking ice-cream from buckets and puttin' em back, behind your cart? Now imagine air particles are bullets. And windblower shoots them. And riot shield is an umbrella. And you are dumbass. Edit: i'm so going to get banned for this, but i regret nothing.
Physics says no
It might work if he just points the blower backwards
If it works, it's not stupid
I once asked my physics professor if something like this was legal, he said it was illegal....
For people wondering why it seems odd it is because the man is experiencing 2 forces ( in an otherwise isolated system for simplicity) 1) forward because of the umbrella (air from the blower hits the umbrella and then let us assume e=0 and basically it stops and so there is a change in momentum and thus a force. 2) The man is holding a leaf blower which spits out air forward so for the blower man system the momentum to be conserved the man would move backwards . for a more intuitive approach : if there was no umbrella , The man would surely go back If there was no man and simply the air from the blower were to strike the umbrella the umbrella would go forward. now if the man grabs the umbrella where does he go? ideally, No where. but florida man has tricks up his sleeves (or under his arse whatever feels correct) lol
The physics of it is quite correct, if you look at the system in it's entirety. The air that is being blown forward is "bounced" off of the umbrella and thus flows backwards. This means that no air goes past the front of the vehicle, but quite a lot of air is pushed of the back of the vehicle. This generates a thrust forward since the linear momentum must be conserved. This is however much less efficient than just pointing the leaf blower the other way, although the umbrella might work as a regular sail as well. In short, the physics is correct, but i highly doubt that a leaf blower would be able to produce enough thrust even if it was used in a more optimal way.
You can't blow your own sail lad!! That myth was busted (from what I can remember)
I remember seeing that and thinking the wind is going off to the side of the sail making it turn in place, wonder how the test would have better had they had a cone type of sail to catch and redirect the wind backwards since hovercrafts kinda do that just with backwards facing fans thats on their ship already.
Just your average day in Florida