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


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Published: 1 month ago
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If you have a closed box on a scale, and fly something in it, like a drone, will the box weigh less when the drone is in the air vs. when it is in the box? What about with the lid off? Or with no box at all, just hovering over the scale? In this video I answer these questions and talk about why what you see actually happens!


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comment  Comments

There are a lot of people commenting that planes don’t fly by throwing air downwards but rather by the pressure differences created by the airfoils. But remember that the normal-pressure air well above the wing pushes down on the lower-pressure air immediately above it, effectively "squirting" air down and behind the wing in a backwash. In other words, the pressure difference that a wing creates and the downwash of air behind it aren't two separate things but all part and parcel of the same effect: an angled airfoil wing creates a pressure difference that makes a downwash, and this produces lift.

4 weeks ago

The Action Lab- what drone is that??

6 hours ago

Bernouilli equation does not hold for compressible fluids! it is just not correct to use it.

4 days ago

People miss what Bernulis equation is. It simply states that the total pressure of a fluid mass is a constant. Total pressure equals the static pressure plus the dynamic pressure. It does not calculate lift per se. We can integrate the pressure and infer lift. Lift and drag are the net result of the change in momentum of the air mass being worked upon.

4 days ago

MIT
"The wing tip vortices produce a downwash of air behind the wing which is very strong near the wing tips and decreases toward the wing root. The effective angle of attack of the wing is decreased by the flow induced by the downwash, giving an additional, downstream-facing, component to the aerodynamic force acting over the entire wing. The downstream component of the force is called induced drag because it faces downstream and has been "induced" by the action of the tip vortices. The lift near the wing tips is defined to be perpendicular to the local flow. The local flow is at a lower effective angle of attack than the free stream flow because of the induced flow. Resolving the tip lift back to the free stream reference produces a reduction in the lift coefficient of the entire wing."
Here you go downwash reduces lift

6 days ago

Thank you, I forgot to add that bit in my reply. Yes I studies aerodynamics for a year.

6 days ago

The beginning of this video set off my Google Assistant. Weird.

7 minutes ago

No, it will not weigh less. It contains the same amount of stuff, so it will of course weigh the same. I am not even going to watch this.

31 minutes ago

People say his voice is boring and stuff like that, but to me, it's relaxing. I'm used to Youtubers like JackSepticEye, Markiplier, and PewDiePie. They constantly yell, so these videos, this voice, is very soothing.

4 hours ago

Lid on will not change, no lid will go 0, glass plate 0

9 hours ago

First of all, great idea; thumbs up for that! However: had this experiment been done more accurately and a faster-reacting scale been used, you would have found that the "weight" goes to above zero with the drone hovering above it. Same principle as with photons elastically reflected by a mirror; it's surprising at first but the mirror will be subject to double the impulse of that photon: first its impact, then it bouncing back. Classical question in physics exams. For the same reason a sailboat will move forward if you blow into the sail while sitting in the boat (difficult to do this experiment precisely enough in real life, just like yours); MythBusters have shown it, too. In your case the scale would have read a positive value had it been done precisely enough.

9 hours ago

Well made video 👍🏻

11 hours ago

Where did you get your degree?

17 hours ago

You need to get it right on the scale to get the ground effect from the Drone

17 hours ago

I guess that in the closed box the weight won't change, but in the other two cases it will

19 hours ago

no

1 day ago

Negative. The drone flies by throwing air downward. Fixed wing aircraft, like the model B17, fly by Bernoulli’s principle.

1 day ago

Air pressure.... it won't change simple because ether force needed to make the object fly

1 day ago

Your such a bad pilot

2 days ago

Before watching this, I'm going to hypothesize that the number on the scale won't change, for the amount of energy and mass of air to keep it up would basically be the same as if it were just sitting on the box.

2 days ago

Here's my prediction:
(1) Closed Box: As the drone rises, the "weight" will increase, but as the drone stops rising, it will decrease again. Once the drone is hovering at constant height, the "weight" will be the same as it was when the drone was sitting at the bottom doing nothing.

(2) Open Box: As the drone rises, the "weight" might increase slightly, but quickly decrease again, and go past, below the weight it had before.

(3) About the same as (2), but the "weight" will decrease even more quickly as it rises.

2 days ago

0:44 I think the weight will increase because of air mass.. =D

2 days ago

If you learn how to fly the stupid thing, you would get actual results

2 days ago

It's gonna be same ...right?

2 days ago

That's obvious it's because of the thrust

3 days ago

Your theory of planes throwing air down, equivalent to the weight of the plane, is that realy tro? It is not the same as with drones. I would say that air foils on planes, as on boats, create negativ pressor on topp of the foil created by quicker airflow in top compered to the bottom of the foil. The airpressor below a plane is not equivalent to the weight of the plane as it is with a hovering drone. The reson for that is the forward motion of the plane. Witch means the airstream is not pointing downward, but a lot more horisontal.

3 days ago

I don´t think that is correct. What creates lift on a forward moving foil is the the creation of low pressur on top of the foli created by arflow passing the foil not downward,. the faster the flow, the bigger the lift. That is why a wing/foil can stall. The same principle apply on sails on a boat. If the foils angle of attack towards the vind is to big eg. (maximum pressure below) then the flow on topp of the wing will disappear eg no low pressure, then the foil will lose all lift and crash. But I might have got it wrong. Your experiment with the drone is great eather way! :)

2 days ago

Not air pressure, but air mass accelerating downward which generates an opposing upward force

3 days ago

ok, so do you mean that there is a air pressure below the plane equivalent to the weight of the plan?

3 days ago

The air stream has a horizontal component and a downward component. But it is the downward component that keeps the plane up. And it is the same physics as a drone, a drone or helicopter is just a rotating wing.

3 days ago

The air will puch down so there will be more wight

3 days ago

Needs lessons on how to fly a drone....

3 days ago

Click bait mavic in a box

3 days ago

Lol nope

3 days ago

Something in between

3 days ago

Some flat earthers got offended. Dont know why I said that.

3 days ago

You are a terrible pilot

3 days ago

I was a full 3 minutes in when I had the face palm moment of "Oh yeh, the equal and opposite force obviously"
Im only at 4:00 mins now so I hope I'm right!

3 days ago

How many times does this have to be repeated until the dumbdumbs get it? In order to maintain position relative to the cog of another physical body (without colliding and "resting")with mass you need to negate the gravity force of the interaction between you and and the gravity well of that other body with a equal propulsive force. Your mass can never be negated (according to current science).

4 days ago

No

4 days ago

in the closed box i think it will stay the same.
a balloon of water is just as heavy with the water at the top of the balloon as when the water is at the bottom.
in the open box it will change because air can get in to replace the drone, where as the closed box still has the exact same massa inside. although the pressure from underneath the drone will still somewhat neutralize the weight difference i think, maybe to 10 grams is my guess. (there i no inside of an open box btw)

edit: welp, didnt expect the effect to be so little :P

4 days ago

better than king of ran..

5 days ago

So what if a helicopter hovers above your house with a wooden roof?? Will it collapse??

5 days ago

Very cool video. My colleague and I did something similar at our school. I would just add that the full physics can be described by the acceleration of the center of mass (well defined for the closed box, less so for the open one). You kept the accelerations very low. Full throttle in a closed box would increase the weight until it hits the roof, and than have a sharp decrease. If you close the engine, and free fall you will have a decrease in weight and than an increase at the impact. I think it is a nice complimentary way of thinking to the direct forces on the bottom of the box.

5 days ago

1:23

5 days ago

U didn't mention and a pressure

6 days ago

downpressue from the drone keep the box/plate same weight

6 days ago

this is great

6 days ago

So dumb

6 days ago

Nice vid

6 days ago

It will stay the same as it takes the same downward force of air as the drone weighs so if the drone sits there at 21g or of the props are creating 21g of downward air force to make it fly, the scale doesn't know the difference.

6 days ago

By the first box i can see you should stick to that box dont use the one that doesnt have walls how top

6 days ago

Every action has an equivalent action

6 days ago

This is loke saying if a helicopter flies over you do you weigh 2 tons?

6 days ago

The plane does not "throw air downwards" it only applies a pressure on the air around it. If you are referring to the thrust of the engine, then yes the engine throws air horizontally. The air is pushed downward and is not thrown the air downward meaning there is no air flowing from up to down unless you are talking about re-circulation or down-wash wish creates vortex on the tip of the plane and which you've illustrated in a photo in your video. If you are referring to those, note that they induce drag and not lift and the vortex is not throwing air downwards. The vortex line is horizontal.

1 week ago

I think it will go down in weight

1 week ago

Your voice pisses me off

1 week ago

this is kind of similar on my thought of if you jump on a moving train would you move against the way the train is moving or would i land on the same position?

1 week ago

More the air blows it down

1 week ago
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