My first commtest submission as a physics student!! The water has an insane amount of kinetic (moving) energy as it reaches the blob. As it hits the inflated side of the blob, it transfers its kinetic energy into potential energy. This potential energy travels across the blob from the inflated to the deflated side, and the object on the deflated side is propelled upward with equal energy to the bag of water as it fell, quickly turning back into kinetic energy. Now, this is only in an ideal world. Due to the laws of thermodynamics, energy is lost during the transfer to friction, sound, etc. Therefore, the ideal length of the blob is probably even shorter than the one used for the boat, I would say roughly twice the width of the bag of water. If you look at the “slowie” at the end of the video, you can see the bit of inflated blob between the water and the boat. In that distance between the falling water and the object, a small amount of energy is being lost. That being said, if the object is too close, or the blob too short (less than half the water bag’s width), then the water bag will either hit the object or the blob will not have enough space inside to re-inflate the other half of it, immediately compromising the spring force of the blob that makes watermelons fly to outer space. Hope that sounds smart enough :)

Hey! Thanks for the shout-out to all of us Marks!

Y'all need to launch a piano. I can't wait to hear what it sounds like when it hits the ground.

I happen to go to the camp where the blob was invented, so here’s a little story about it’s creation! The camp’s founder, Tex Robertson, needed a temporary roof for the archery shack, but didn’t have much of a budget, so he bought a tarp container from the government’s war surplus. I’m not sure, but I think it used to store gasoline. Anyways, to move the blob over to the archery shack, he pumped it up with air so he could pull it. While he was pulling it, his friend (I forgot his name, but I think it was Patrick) jumped on it and found the bouncing it did was pretty fun! They started experimenting with the blob, and found that it worked best on a lake, so they put it on the lake and made a little diving platform to jump onto it, and later put a “sock” over the black rubber blob, since it got very hot in summer. Some changes have been made over the years, but it’s remained about the same since it’s beginning.

The smaller blob can hold less air in it than the big blob. However, the size of the water bag is the same. What this means is that, proportionally, the small blob can move more air over to the other side of the blob quicker and harder. This also means that the water bag cannot push out all of the air underneath it without fully inflating the other end. This gives the smaller blob a much more forceful launch; however, it also causes the small blob to burst pretty much every time. As for the Big Blob, you can see in the slo-mos (2:14, 4:40 and 12:42) that the water compresses the blob, then the air has to travel across the length, which allows energy to dissipate before it reaches the projectile. The larger volume also allows for the air to adjust and compress to the sudden 1,000 kg of force. Overall, this happens in a fraction of a second and does not dissipate a lot of energy, but the compressibility of air allows it to absorb the impact like a spring. This heats up the air, which is a loss of energy. Again, this loss in energy is very small, which is why the Big Blob still performs spectacularly. Edit: TL:DR More air can absorb more energy, so smol blob is better. The air absorbs a small amount of energy, so the difference is small.

Crane operator: "this is the weirdest jobsite I've been on." 😅

That boat flip was insane! The bag acts as a see-saw, a weight pushes one side down forcing the other side up. The main difference is the air. The smaller bag should send items higher as there's less space for the forced air to travel to making it more efficient, though there's more of a risk of it popping. Using the principle of conservation of energy you can roughly predict how high the object will go, though you can't predict how cool it will look in slo-mo! Also, would it be ridiculous to play noughts and crossed with the blob, basketball or javelin style?

2:06 that footage was amazing!

Need to get Mark Rober to design ya'll a high energy, high velocity capable blob. Since those are technically designed for humans. Need like a kevlar ultra tough stitching Super Blob. Challenge initiated!

So the blob works on something called impeadance matching. In this case it has to do with how effectively the mechanical shock of the water bucket can be transfered to the air inside the blob. Then the compression wave of the air has to match up with the fabric on the other side to launch the items. The interface from impact to air to launch is an impeadance matching problem. The best way to find out the proper impeadance matched air fill is 3d modeling. This modeling is like what Mark Rober did for the trampoline.

Mechanical aerospace engineer here. What is happening is an impulse. Which is a transfer of power/energy in a short amount of time. You are taking the momentum and force of the water and transferring it as fast as possible into the object you are launching. The size of the blob ONLY matters in the direction of the energy transfer. Therefore if energy is only in the X axis, the Y and Z axis don't matter. It can be simplified like a seesaw but where the fulcrum. The longer the seesaw the greater the force transferred. If 1000kg impacts due to gravity that's about 10,000 N. Multiply this by 10 meters to get 100,000 N*m torque. Then the object being launched you divide by that length from fulcrum, say 1 meter, and divide the mass, say 100kg. And that object is being launched at 1000 m/s^2 aka 100 Gs

Was it higher than the trampoline launch? Looked incredible boys! Thank you so much as always you bring such joy!

I can't help but feel as if I have been summoned

In sted of sitting object on top, push the end inside itself and put objects in the pocket. They will shoot out like a cannon

"Hello, Perth Motorplex" "Hi, we have a youtube channel and we would like to rent the track to drop 1 ton bags of water on an air blob to see how high we can launch stuff." "Is that it?" "No. We also have a golf club the size of a small bed that we've attached to a truck and we want to see how far we can launch stuff."

08:30 for the question "which blob is better, the big or small", the smaller is better because the longer it is the more energy is lost, so to answer the question, smaller is better, plus I'm in late to this video but keep up the great work

The Statue of Liberty is 305 feet tall, _including the massive base._ These absolute madlads launched a rubber ball 40 feet higher.

I MARK my territory as a Mark. Never felt so much attention from a UKposts video before. I feel so wanted. Good job guys. Love your content.

Destroy things with the HAMMER! BEST videos yet

Loved the Mark-related shout out. Thanks guys; your vids are always a blast!

Hmmm ... I'd love to see a washing machine, a dish washer and a fridge each launched with the Blob :D

I feel like I have to suggest this: Can you Line-X the blob and launch a car with a van? 🤔

I love the flying camera slowies, and how much fun you are having.

To answer your question about bigger or smaller working better; smaller works better. Air has a particular amount of compression per kilogram of weight applied. That compression absorbs some of that energy. As you increase the air volume, more energy is absorbed. In exact same environmental conditions the larger blob will absorb more energy due to air compression. You could actually measure how much energy dropping the same weight, from the same height, on the same object; just use different blobs inflated to same PSI. Use the height difference between the two and you can calculate how much more energy the large air volume of the big blob absorbs.

The blob is full of something, and things when dropped on it make other things go high. - My only form of education is Science with Gaunson

I have to say, I stumbled across HR a few years back, and I have been here since. No matter how long or bad of a day it has been, these videos get me back into a good mood, laughing and having a good time! Thank you guys!

Finally some recognition for us Marks!

Ruthie did a triple flip and made a perfect landing on both wheels. First boat ever to do a double roll and make a perfect landing. You guys just made history!! Congrats!

Idea: Build a giant marble track for a giant marble at the tower

Let’s get Mark Rober back on the show to help make the most durable blob ever. Then start throwing some really big/ heavy stuff around.

6:05 WOOOW was that are biggest ever anything XD 😆 I'm dying that wow was so powerful 🤣

Best flipping unexpected ending ever my dudes!!!! Best vibes to you guys, keep it up 🔥🔥🤘🏽🤘🏽

My mate sent this to me. And then I subscribed. I appreciate the welcome. And I am watching this in the morning after getting up with a screaming toddler. Cheers.

Does anyone else love how the bike landed wheels down

This is some of the best stuff to watch when you have insomnia. Thanks guys I love ya!

The smaller one is a lot better for smaller items, but you can get more trajectory from the big one with less air proportional for the size it will make a lot more pop of the blob. The big one can also have bigger items like the boaty, so I would pick the big one with a little less air

So.... No one's going to weigh in on how Ruthie nailed the landing? I mean, she crushed it.

"Why would anyone else... do this?" That pretty much sums up HR right there.

Best thing to watch with lunch on a day off from work. 44!

Blob size: It's more about how much air is in the Blob. The ideal amount of air, would give you an internal Blob pressure during the impact, that is just below the popping pressure. Also, the farther the items on the Blob have to move while still in contact with the Blob, the longer the acceleration time will be. Ideally, the items should be place on the Blob while partially deflated, and then the Blob aired up to the point that the items are just barely lifted by the blob. You can always ask the company that makes the Blobs, to double the fabric thickness. :D

Scott: “Atta girl Ruthy!” Also Scott: *kicks Ruthy’s head in*

This is Marky Boy shouting right back at you guys, and to all other Marks out there Hello from England. #How Good

"Why would anyone else do this?" Best question of the year.

The HR boys should go to a lake with the blob and launch themselves. Seeing Gaunson fly through the air doing science with Gaunson would be a classic. God bless guys

Blobs have sweet spots at both ends as far as incoming and outgoing mass placement for determining angle of launch. The length and pressure of the blob are going to determine the energy transfered through the pressure wave to the projectile changing it's distance along that launch trajectory. There will be an optimal solution where the graphed curves intersect between pressure disapation over distance and wave reflection impulse spike. Good luck.

"Something is going to happen" Well, that is an accurate statement.

My thoughts, late though they are, on blob, bag, boat physics is quite basic but Gaunsonesque in it's rational simplicity. The minimum amount of required compression is the volume of blob you have. Just inflate the bag with a full blob just suspended but sitting on it so it's basically on the ground 1/4 of the way along the bag. Fill that baby. Once bag is full as far as it will go with the blob still on sitting on it lift the blob into the air and the correct amount of water displacement will be left in the bag. Then put the boat on with it's centre 3/4 of the way along the bag (having a blob just less than the width of the bag assists the physics happening). Drop that baby blobby and watch target object fly!! Basically whatever the weight/volume of blob, that's all you need to displace to give maximum performance. As long as your blob hits the bag centre bull on the 1/4 the 3/4 should go up transferring it's energy efficiently. If your bag is bigger than the blob you could try to fill the blob until even the bag pressure lifts it. When it drops it will transfer energy for longer until it hits the ground. Variations of bag size , bag dimensions and blob size are all dependant on the strength of the joins in the bag. If you're able make the weakest join at the farthest point to the position of impact this will alleviate the pressure on the nearest joins. My most important thoughts to avoid bag destruction at impact is to lay a couple of big strips of carpet or some tough protection over a larger area than where the blob will impact. Will help protect the bag and also spread the pressure a bit more. It only slows the energy by a few millisecs but worth the investment I think. #4EVA44

This is also my favourite video that you guys have made so far.

“Why would anyone else ever do this?” Herron says with genuine confusion and concern😂😂

Mark Rober needs to get in on this and send something to actual space

We love our new merch...thank you guys so very much. 👍 ~Marz

11:35 watch in 0.25 speed, there is exactly one frame where Herron's sunglass come off, float, and vanish x"D lmao

You gotta do a shirt with a silhouette of Rexxy and all the Tennis Balls flying off the Blob! Killer video!

The way the blob works: the water landing on the blob decreases the volume on the back of the blob. Since volume and pressure have an inverse relationship, the air pressure on the back of the blob increases and moves the air to the front. The movement to the front decreases pressure and (inverse relationship) increases volume, bouncing whatever is on it. Thank you 10th grade chemistry. P.S. I got a B on my final so there is a 20% chance I'm wrong

Yeah for all us Marks! God bless.

Impressive! Never a dull moment with you guys. I got a great laugh!

The mechanics of the boys *"shorter vs. longer blob being more powerful?"* question: In a nutshell the shorter blob has the most potential to transfer the energy best, since air can be compressed; the less air available to compressed the less potential for energy transfer loss. The sooner you can compress that air to a point it starts resisting compression the better. The vinyl itself also has a bit of stretch, so the more surface area you have stretching (thus alleviating pressurization) the less bouncing energy you'll transfer. The only reason to use the larger blob is to have less chance of it popping, because you'll get a more gradual transfer of the heavy water to the heavy boat, giving the blob a little more time to stretch and transfer that energy. Giving it time to stretch is comparable to our skeletal muscles, if you try and do the splits by dropping to the floor you're going to tear something, however if you stretch for a few days you'll do it no problem. It's just like that only on a timescale of nano-seconds.

"could this be the highest a melon has ever been launched?" two words punkin chunkin

Its been so long since ive watched this channel and Rexie is still here,, Nice.

the bowling balls was the best last time...they just sounded pure evil coming down..you guys made 2020/21 better

Honestly, we're at the stage now where I see the Eternal Watermelon and just feel fear from the mere prospect of it popping. I can only imagine the fetid, fermented horrors contained within.

5:51 we need an uncut version of that shot. No other shot gave that height justice.

That boat flip tho! That was the coolest thing I've ever seen. Definitely DID NOT expect that! Lol

5:15 so for that the blob if it is smaller there is a quicker energy transfer witch means more speed for high

11:35 Herrons excitment scared the sunnies off of him

"If 1000Lbs of water doesn't wake you up in the morning something will.....maybe a screaming toddler"😂

11:50 From the hull’s perspective, it was de-cab-itated

Should have put Ruthie in the boat driving too!! Amazing stuff guys, so jealous you get to do this for a job haha 👍👍👍

At 6:32 you can actually see a rainbow in the explosion of water, great elastic ball Launch. Phenomenal!

We need Mark Rober to make a Blob

Their laughter is so contagious when they break out into hysterics when the boat crashes 😂

Blob launch a tub of skittles like from the trampoline viddy! Great job guys, How Good #44 club all the way! Love you guys, keep up the great work!!

I just love their enthusiasm, it makes me happy that these guys can be so happy. Keep making people smile✊

“You don’t wanna blow it out the back end especially when they got melons” thought this channel was PG 🤣

You've done a lot of crazy stuff in the past, but that boat was absolutely bonkers

so here the thing the way it works its because once it makes contact it then transfers that energy to every section on the 'blob' and this might not be the clearest answor but lets say you have like a bowling ball and you drop it on a matress like a bed mattress well that would have to go and dispers the energy to each spring if 1 sprin gets compressed by 20lbs then the rest will reverse compress by that 20 divited by how many springs you have same thing for the water molecules in the 'blob' thoes have to move out of the way since theres a big weight compressing it so it will then go out and push the opposit end or the furthests ends sorry if my english is bad im french but yea um it will push out the ends that are further away and strech the material out a lil bit but just remember this 'what comes up must come down' but with compression of molecules if it breacks the molecules you aint that bad for trouble but if you endup spliting an atom inside wich is way neer to imposible thne you just wiped out a full on city but cumpressed = decompressed or streched = back to normal... eventualy what im thinking in theory small is better but the weight has to change depending on the stress of the material of the 'blob' but bigger means bigger weight and also more despurtation (spreading evenly) so theres less of a reaction or 'flinging' stuff in the air also sorry for this paragraph have a good day :)

This is like Hollywood level stunts right here. With a little CGI, that slo mo shot of the boat could look like a huge wave flipped it or something. The blob is a beast!

10:35 If you’re here just for the boat

The little blob is better because the energy doesn’t have to travel as far before it gets to the object your launching so it has more energy pushing it up

Imagine the rubber ball bounced more then twice as high as the tower they nomally film at. That was massive. Also nice catch gaunson #teamgaunson

Well, this is awkward...I've never felt so important

Suggestion: Lower the amount of air that you put in the blob. Now this could all be total crap on my part, but it sounds right to me... Ideally what you need is for the blob to be at full tension (i.e. max air pressure) when you rest the filled water bag on it and it's base is flat to the ground. Perhaps rest the filled water bag on top of the blob before you inflate it, and then blow it up until the water bag just starts to move, that should ensure that you're close to max pressure taking the water weight in to account and it may prevent the blobs from bursting so often. Again, I'm no scientist, but to me it just seems to make sense.

You should do the rubber band ball again and strap a go pro to it! Awesome video guys 🙌🏼🇬🇧

I feel like you guys should make a blob out of Kevlar so it doesn't rip and drop some massive things!!

If something falls on the blob, the energy inside it is going to the opposit side of the blob wherd stuff is laying... How smaller the blob( not too s small) the blob, how faster the energy replaces itself to the other side, so its going faster and higher beacause there is less air that has to move!

I want to see them open the LINE-X watermelon at some point, i'd imagine it does not look pretty in there.

I wonder if u can trigger a Magnusson effect at the same instant in time that the blob transfers its energy to the projectile?

this is correct i learnt it in class the other day The water has an insane amount of kinetic (moving) energy as it reaches the blob. As it hits the inflated side of the blob, it transfers its kinetic energy into potential energy. This potential energy travels across the blob from the inflated to the deflated side, and the object on the deflated side is propelled upward with equal energy to the bag of water as it fell, quickly turning back into kinetic energy. Now, this is only in an ideal world. Due to the laws of thermodynamics, energy is lost during the transfer to friction, sound, etc. Therefore, the ideal length of the blob is probably even shorter than the one used for the boat, I would say roughly twice the width of the bag of water. If you look at the “slowie” at the end of the video, you can see the bit of inflated blob between the water and the boat. In that distance between the falling water and the object, a small amount of energy is being lost. That being said, if the object is too close, or the blob too short (less than half the water bag’s width), then the water bag will either hit the object or the blob will not have enough space inside to re-inflate the other half of it, immediately compromising the spring force of the blob that makes watermelons fly to outer space. :):):)

Guys you have to go big and you know it! do it HR stile and launch a plane!

The fact the boat did a double barrel roll and landed was fantastic

The blob works by having a certain amount of air in it that goes the the end of the blob when another object hits the other end and that launches the object at the end. The big and small blobs are as good as each other but are good at doing different things

Would be really cool if you edit the drop into the leap in the air view with the 360

Now that's one flying Dutchman of a boat if I've ever seen one. Maybe a Kevlar blob will solve the blowout issue

"Was that our biggest ever anything?!" Haha brilliant

I shared this with my good mate Mark Jones, performance poet extraordinaire from Devon, UK... had a good laugh! Thanks guys! I've been pushing him to subscribe like I am. :)

Yo, I’m in love with that Holden UTE!!!!

You should try stacking rubber-band balls one on top of the other like in a previous video you guys did back in the tower, this time with the giant blob!🤩

Love How Ridiculous went from dropping stuff to sending them to Mars! 😂

The water may work better in this application since the bottom is flat it will disperse more surface area quicker. Dropping the wrecking ball on other stuff would be cool though.

It would be great to see the big steel ball from the tower videos be launched on the blob!