Can an Umbrella Made of Water Stop the Rain?

This is the

water

umbrella

, it uses

water

to protect you from the

rain

, so I won't get wet right now. It's okay, it's just starting to

rain

. Let's turn on our water

umbrella

and you can see the bottom. I'm completely dry, so let's go. Let's see if this can really deflect the rain with water sprayed down the sides. Who cares about the people around me? I'm dry underneath with my water umbrella now, before we try our water umbrella, let's talk about why on Earth I would ever need it. To make a water umbrella in the first place, it all started with a crazy Kickstarter called air umbrella.

This was a failed Kickstarter that became a famous internet meme due to a very dedicated backer named Michael who commented religiously asking for a refund for years. Unsuccessfully, a few years ago I

made

a video showing how the air umbrella is pretty impossible, you can blow off small droplets but basically you need a leaf blower to turn it on, but the madness didn't

stop

there with that video. I received more comments. People who weren't happy with the air umbrella wanted to see if it was possible to use a fire umbrella, so I

made

a propane powered fire umbrella that blew out fire in 360 degrees, this didn't work either, it dropped hot water. through, but it didn't come close to vaporizing the water before it passed on both devices, water always wins well recently.

I had an amazing idea of ​​a comet in the fire umbrella video. What would happen if you made an umbrella with laminar flow water? Spraying in 360 degrees would work. The first thing that came to mind that usually causes water to come out in all directions is that if you ever turn on the sink faucet and there is a spoon in the sink, spray it everywhere and the spoons really work. Well for this, but the problem is the spoons attached from the side and that causes the water to drip down, so instead I attached a small plate to some aluminum that goes through the center of a pipe so that water can spray in all directions. no handle on the side and this actually worked perfectly fine so to test this I have some black water here.

You can see that when it drips on the ground we can tell where it drips so we can delineate which water is rain and which. Water is our umbrella, so let's first start with the lowest setting and see if any water passes through when I drop it from above. Preliminary tests actually looked pretty good when I dropped the Black Water on top. You can see that it deviates and our test. The subject remains dry inside. You can see that the black blobs are deflected and pushed to the side, but these blobs are not moving very fast.

I'm dropping them right on top of the umbrella, so now let's drop them a little higher, so by dropping them higher, it easily goes through the flow, okay, so this is not a high enough flow, let's turn it up a notch. little more and see if we can deflect the drops, so I'm going to let them fall a little higher to see if they can get some. decent speed before they fall at this height, the droplets are going at about half their terminal velocity, so they're not even at full speed, but they can cut through the stream.

Steel, now let's try it with full power. Well, let's see if this. actually works fine pour it oh ok that didn't work so I have about a 20 foot radius of water sprayed around me but it still can't

stop

the smaller droplets from coming out when they fall from above. The problem is that we If we have a momentum battle, we have the momentum of the falling raindrop moving downward and then we have the momentum of the umbrella moving at right angles to the falling raindrop if we had exactly the same velocity for both and the same mass for both would move it at a 45 degree angle once they collide, since the terminal velocity of a falling water droplet is around 10 meters per second, which means we need our Water umbrellas will move at much higher speeds if we put a new tip on. on it with a smaller hole it increases the speed much more and it looks like we can raise it enough that no water drops get in now, but the only problem now is that the lateral speed is so high that we are spraying water in a radius of 30 feet around us, so this is not ideal for an umbrella, but hey, in this case we are going to have to worry about number one, who cares about all the people around you, let's stay dry under our Water Umbrella We know that high speed water in the lateral direction can deflect fast falling water, so now the question is how much water we can deflect with this fast moving horizontal water well.

Let's see what we can do with higher pressures and flow rates. so we're going to need a bigger hose and what's the biggest hose on the fire hose so we can see that with the fire hose you can easily prevent a bottle of water from being poured underneath you don't even get a 45 angle degrees, basically you just convert the vertical velocity to horizontal velocity, the horizontal water momentum is much greater than the vertical momentum, then when you add the vectors you basically get the initial horizontal momentum, so now for the final test let's see if I hold the fire hose. over my head if I can deflect an entire bucket of water that falls on me.

You're not understanding me, it was at this point. I realized while holding a fire hose over my head while my wife dumped a bucket of water on me that maybe just maybe the water umbrella isn't a good idea and I'm really nervous about asking for other umbrella suggestions so maybe maybe start a Kickstarter for the water umbrella in case Michael makes a donation and thanks for watching another episode of the action lab I hope you enjoyed it if you have any questions or comments let me know in the comments section and I'll see you next time time, thank you.