If You Fly a Drone in a Closed Box on a Scale, Will the Box Weigh Less?-Mind-Blowing Experiment! 

I have a little fun experiment for you. If you have cold water in lets say a cup, if you shake or stir it a little will it make the water colder or does it warm up because of friction? If you put some ice in the water it will get colder, but will the water get colder by itself?

+Pirat Carribean good idea! I might just do that!

Can a drone fly in a vacuum chamber?

The Action Lab Well people that say that are wrong anyway. If they were correct, it would be impossible to fly upside down. There is also angle of attack, that deflects the air downward to fly, as you correctly said

Colby Ness - I was just going to ask that too. then I thought of the vacuum cleaner did be the same as the drone. but at least with the drone we can see what's happening. also add color smoke bombs to see what the blades are actually doing.

Now ,as we see it it's , easy pesy

If only they would show it in the end. You could just skip to the end. But they usualy show it in the most non-logical time, something like 14:56 - 15:32 out of 20 minutes video.

The title should include the answer to the question if it is straight to the point.

@@maximumhero9682 then nobody would click on it

Usually i opened it for them

@@madharambe3264 good man

Or moths when they see a lamp indoors

Whats the last thing a bug sees when it hits a car windshield going 60mph ? Its buttonhole . 😂 😂

Yep I was going to write the same thing but here you are

:(

Yes, but there must be some dependence on altitude eventually.

I _wrote_ the same thing

I thought the same

thanks captain obvious :|

Pressure or Force. Btw the unit of pressure is Pascal not gram

@@rubaiyatmehedi9337 if i remember correctly pressures just newton per square meter. So to lift 21 g the drone has to apply 21/1000 * 9.8 Force down against the force of gravity, if say the drone is 1 meter in surface area it has to put that amount of force on same 1 meter area of area which gets pushed downwards which causes the weight machine to count the same mass. If that makes sense?

@@cpt.battlecock5264 yes Newton's per meter squared is the same as pascals. And yeah you're totally right.👍

@@rubaiyatmehedi9337 Fuck yes. Im finally getting an intuition for classical mechanics.

No, because he intentionally bumped into the box to see if it will change the scale reading or not

@@fennviktorvich I'm pretty sure the first instinct in these kinds of experiments is to fly it up, hovering in the middle of the box. But he just bumped it all throughout. I call bad flying skills.

@@fennviktorvich 3:29 with sides all removed, see how he struggled to keep it still..

I actually used to have the SAME EXACT drone (the small red one he first used)And let me tell you. IT IS HARD TO CONTROL.

It is not a professional drone with altitude control, its just a toy try to fly a toy helicopter and a professional RC helicopter you will find the difference!

Tello?

Its a tinywhoop

Exactly. Somehow this channel has way more dumb people on it than other science channels...

I didn't read all of the comments, but none of those that I've read strike me as particularly Dunning-Kruger-ish. Could you point me to one or copypaste one here?

I have no idea what dunning kruger is, but I'm assuming I'm probably one of the people your referring to because of the fact that I have no idea what the dunning kruger effect is

@@ChrisLuigiTails Including you.

@@yoshi6445 simply put it's a relattion between confidence and knowledge. How 'dumber' people overestimate their abilities.

Daniel Warnock it's literally the same thing. It's plastic tubs.

I know, that's so unforgivable, this experiment is clearly a lie!

Clearly Tupperware is being generalized.

Details matter people.

It's like buying a Land Rover, then going around calling it a Jeep

Ohh wait wait Today I saw a video of a popular Indian uthuber (RU-vidr) with 12M subs. And he said that Newton's third law works.. and showed that flying drone will weight more than resting drone.. And I was like.. wtf dude.. And now I'm here 😁 So I wanted to know the ans 😉

@@manishkumarshakya7989 you mean crazy xyz lol..

@@b-beluga4510 yepp 😂

*TWIDDLES CONTROLLER FURIOUSLY*

T-Rex FPV he’s so bad

David Ouch, that tiny thing probably only has headless leveled mode.

Tbh acro flight is fucking impossible, but darn fun.

imposible to fly in stab mode! it tends to always correct self. in acro it keeps constantly angle what you want!

it is happening because of air turbulence

Did you calibrate it?

is nobody able to take satire jokes?

its not satirical at all..

I read this before actually seeing it take off and when it did I couldn't breathe I was laughing so hard

if its powerful enough the engine on the fastest plane the blackbird sr will probably be like a pressure wash

The pressure of the plain would be distributed over a larger area than your body so you would not feel its full weight, but you would definitely feel some pressure.

Well actually the draft downwards is the product of the so called induced resistance, which results out of a pressure exchange on the ends of the wings (since theres an underpressure on the upper side of the wing and an overpressure on the downside). It results in a whirlwind like thing on the end of the wings and is not actually the thing which presses the plane up. This induced resistance is actually a bad thing since its well... resistance - which causes the wings to create less upward trend. To come back to your original question: The whirlwind thing stays for a while in the path the ends travelled through. The strength and duration depends on the difference of the overpressure and underpressure and the speed/power of the plane Big planes create a really strong and giant whirlwind which is actually dangerous, especially for smaller hobby planes (but also for the passenger machines), which is why theres a few minutes delay between 2 starts on the same runway on traffic airports

LMAO

@@Add50326 Additionally the highest pressure is only at the underside of the wing, it falls away with distance.

What?

Who?

when?

Where?

Why?

Abdal, if a commercial flight impacts a skyscraper at 550mph, how fast will the infidels on the top floor hit the pavement when they jump?

@@V_Deity Well, if i am not wrong then this is about projectile motion where the horizontal component of the impact net velocity would be the same as the plane and the vertical component will depend on the height of the plane when the person jumps off.

David Herrera 3, 2, 1...

He could easily show the thirty second experiment I get you

Thats not as fun though. Just cuase something longer than it needs to be, isnt bad. Its called entertainment.

It is. This is a fact. Every body needs to make money though. The whole point of these is ENTERTAINMENT. and knowledge second. You want to learn, you go through the entire subject. And is it necessary to call me stupid? I dont understand why this is the way we are wired, but because we have a barrier between us, you decide to be an ass hole, while others may act tough. Its ridiculous. I cant stand people judging people, its a bunch of bullshit. Anyways, Im sure your smart. And Im sure you a decent enough person in reality. But I dont get why you, amoungst many, feel the need to be superior.

Justin 355 I was having a bad day. I'm sorry, now that I read this, I feel bad.

I'm not used to them, I deliberately don't watch them because of all the overdramatic yelling, so yeah, there are plenty of us who like his voice just the way it is for one reason or another. And I find that his lack of "RU-vid voice" intonation makes the content feel genuinely interesting rather than somewhat showey and mindless.

The Turtle no, that’s 1st law

@@ExaShark First law is about the tendency of object to keep its state (moving one will tend to move, motionless one will still motionless, etc) while the Third law is about well... action and reaction, which would explain why the drone still have "weight" regardless it was in the air or not. I take the bait anyways. So be happy.

@@GregorianMG It's possible he means Newton's first law of thermodynamics in which he is technically correct but not really.

@@XerosOfficial i doubt he means that lol

just don't specify the number and you can't be wrong 😂

School paradox 😔

Meh I could slap a frog in that amount of time.

Thank you. You are a good man

thumbs up to save time lol

Corey Newhard Depends how tall the container less

Well, the mass inside the box stays the same, what did you expect?

Christopher Lefont what are you talkin about

Ryan McEntire He doesn't even know lol

With my advertisement at the end I ingrained the word "brilliant" in your head:)

believe me, i wrote the comment before the ad section!

i dont believe you

Think abOut this: if a coconut has milk and hair, is it a mammal?

I'm in the shower

If this channel answered all of my shower thoughts it would be porn.

he already did

Spoiler: it had a hard time flying

but did he do this weight experiment in a pressure chamber? 0.o

I don't think he did a video with high pressure in chamber, he did it in vacuum. In high pressure chamber drone would have to do less work.

2:07 clearly the scale doesn't work, no push and no weight on the scale, yet it scores zero! hahahhahahaha!

The Last Knight i agree

Gee MBDT, you sure is a smart fella!

lol

yeah honestly

I didn't read all of the comments, but none of those that I've read strike me as particularly Dunning-Kruger-ish. Could you point me to one or copypaste one here?

@@slehernik why two times the same coments ?

@@spaceexplorationindustry3454 I figured it was 2x more likely to get an answer. 😋😁

No matter how big this box is, and how high the drone flies, the result is the same.

@@HKragh exactly But Pressure will decrease when you increase area,force will remain same

It works exactly the same way - planes are still exerting a downwards force on the air. All airfoils work the same way - whether they be a wing, a propeller or a rotor. The only difference between aircraft is how they harness those effects

Maybe, but the force would have to be very concentrated. With an aircraft or helicopter, they likely distribute the force over a large area so it likely wouldn’t hurt you.

Could a drone fly in air bubble in space, and if so, could it move the bubble.

The downward moving air wouldn't crush you because the air would distribute the energy over a larger area very quickly.

thought exactly the same

i was sad he didnt explain how the air is 'thrown' his description made it sound like they push air down when in reality they create areas of low pressure which creates lift

@@danmccabe9889 yes

Joseph Elmurr really wouldnt make sense trying again after already watching the video. Just like its pointless to suggest it a month later.

what are you talking about?

I removed it!

If you have a twr of 1

mike big t: dat what she said

Same... Except I'm no better... I've had 3 remote control helicopters (just the cheap little things that can't go very far away) and one, big, expensive drone that looks just like his little drone but 15 times bigger and... I kinda destroyed two out of the three cheap helicopters I had (the first one stopped running the bottom two blades cause I'd let it hit things and kept trying to fly it instead of picking it up so the gears and shit wore down and now it flies in circles and the second one I had broke basically the same way, except since I was to afraid to let the blades hit literally ANYTHING as it was running, I'd instantly turn it off when it got anywhere NEAR touching something no matter how high it was so it just kept falling from highs of 5 to 10 to even sometimes 15 or more feet up when it hit or got close to hitting things and I'd just let it fall and crash which eventually broke it as well... It didn't brake so abruptly but it just ran slower and slower like they do when they need to be charged but... One day I had it fully charged and wanted to fly it but... It just slowly fell down to the ground instead) so... Now I'm kinda just to afraid to even TRY flying the two I have left (my last cheap helicopter and my huge freaking drone) because I don't want to break them... Even though it's been like 4 years since I broke the last one... And since then, drones and other remote controlled objects have become a LOT less popular so they probably don't even cost that much to replace and at this point, I could probably get even BETTER ones for cheaper... But... I still don't even dare touch the remotes... :T

Tom Huppi yup that's my expectation aswell. That *weight* is created by the air hitting the ground, with a higher box that ground pressure would vanish.

Einheit-101 I would imagine the velocity of the "exhaust" air would drop very quickly as the drone gains some height. I figured there would be a slight weigh loss because if this at his experiment heights. Who knew?

The turbulent mixing would decrease the downwash speed (you're right about this) but would spread over a bigger area. The original lift force is still same, and this cannot disappear. It must still counteract all the (spread out) downwash. The lower pressure over bigger area would collect back down to the same single-point (force) scale reading. The closed box is a literal example of a "closed system" and its weight (with fluctuations averaged over time) cannot change.

a bottle without vacuum will float on water anyways lol

I think it would depend exclusively on the bottle's density, since the air "in it" wouldn't be playing any job in the overall density's system o

CroGamerPro good question

It would float,because density of real vaccum is zero. Atleast i assume that. Because "nothing" has no mass,since having specific density which is equal to 0. 0kg/m^2 is smaller than 1000kg/m^2. Altrough it would entirely depend on definition of bottle.

A bottle with air in it will weigh less then the water, a bottle with no air in it it will weigh even less so of course it will float.

That’s not how I planes work though

@@FlorenceSlugcat Well all things that fly have to displace air. So related.

1st to reply to your not first comment!

The Action Lab AYYYY

It probably has to do with how quickly the scale measures. If you notice, there’s always a bit of a delay when the weight changes.

Agreed, a much more sensitive scale with fast response time would give a better idea of what is going on.

I think that in an atmosphere this would only really be possible if the mass of the drone were greater than or equal to the mass of the scale. As well as if the drone had minimal surface area/protrusions (like no propellers... or arms). That's all because the force applied by the air would lift the drone up relative to the scale if the area was too great and/or it weighed less than that force. Ideally, a drone capable of taking off in this situation would accelerate the scale downward, thus making the reading spike up from zero for an instant. That force would read approximately equal to whatever force air is pushing upwards on the drone with; but In turn the drone would make its own acceleration less negative ( more negative = greater downward acceleration). This is an ideal controlled situation and really it would be better to use a brick. Even better would be to just give up because who cares in the end?

juncear makes sense

When the drone is in freefall, the scale would (once the air pressure changes reached the bottom) show the weight of the drone vanishing. But that's fine, because forces only have to balance in a static equilibrium situation, which free fall is not.

why? nothing will happen. there is no air to push down on.

@@joosekraft3405 "absolute vacuum cannot be created" the pressure is low it's not vacuum

Talesbougs: A Channel of Historic Tales and Science okay? It still won’t fly. The air will be way too thin

No, it is a closed system the only way to affect the inertia of the system is an "external" force. So inside forces don't matter because as the drone produces a force downward it also creates an equal and opposite force upward hence canceling them.

It doesn't mean the drone can't fly( please don't think my first reply as a wrong explanation of newton's third law, it only need an external force and that's the important thing).

Wut?

That isn't how it works lol

@@kikoeta ya but would you still watch it tho

@@gigabytemon I mean I can imagine it well enough, it would just sit there and do nothing

No because the force the helicopter makes is spread across all the area below it

If you're a flat glass pane 2.5 times larger than the diameter of the rotor of the chopper.... Then yes you'll feel the weight

I too think that the acceleration and accompanying thrust would be factorial in the weight shown by the scale. Maybe not the altitude as such, but the rate of change in altitude.

@@williamhawes7005 hmm as long as you are not higher than the walls I think the height might not matter too much. Since the air that the drone pushes downwards spreads out like cones and walls would focus all the thrust down to the bottom of the box.

In da interwebs.

black market probably

Freedegrees.com lol

:P at a university

And try with increasing sizes of scale surfaces, and what function equates the relationship of flight height to "weight capturing area"

Exactly, I wonder why noone mentions it

Try to blow it something over a hundred M away

yes, though it is spread in a large area

Same thing.

@@ThatBoomerDude56 What about in a box that is 2km tall?

@@dgphi For a flying thing, Force in the "up" direction equals Force in the "down" direction. Doesn't matter where it is.

@@ThatBoomerDude56 there would be no down force on the bottom of the box from the propellors 2km away.

@@dgphi If the box were totally enclosed, yes, there would have to be. The world does not run on magic.