"Did you need the electromagnet to drop the metal ball?" ActionLab: "Yes"

@westonding8953

Жыл бұрын

It helps. Keeps it only going straight down.

@diggaaa13

Жыл бұрын

I realise he used it for good reason, but those were still my initial thoughts, too. :D "How does one create a large splash of water? Well, it's quite simple, really. Let me juuust get my electro magnet..."

@maticz3923

Жыл бұрын

Was hoping for a coil gun

@fluffyfox8286

Жыл бұрын

@@diggaaa13 My thought process was exactly the same!!

@py2724

Жыл бұрын

🧾☑️

I never knew that the Manu was a thing. I've been doing them for about 35 years, made it up when I was a teenager. I've always amazed all my friends and family at how big of a splash I could make.

@joebovovitch7803

Жыл бұрын

Hold a water bottle while jumping in letting it go in the water

@aaronfuge3267

Жыл бұрын

Same story! My siblings and cousins called them butt bombs. It started out as kicking out of a cannon ball, and then you would to try to “kick” water at people on the side of the pool!

@aaronfuge3267

Жыл бұрын

@@joebovovitch7803 we’d do that with soccer balls! Buoyancy can store a ton of energy too!

@charlibiris

Жыл бұрын

You should’ve patented it! Jk

@IncrediPaulAZ

Жыл бұрын

We called the jump a "watermelon." Never did it with and object to launch though. It's pretty cool

There is nothing I love more than the Manu getting the international attention it deserves.

@MrPalermonuncio

Жыл бұрын

Manu Ginobili

@warx9542

6 ай бұрын

I agree!

@ecneicsPhD4554

3 ай бұрын

It didn't. It got appropriated and was renamed Worthington jet.

When I was growing up we had two things we did from the high board (3 meter). One was a "cannon ball" which was the same principle as the steel ball. The chubby kids were really good with a cannonball. It also was a way for kids who didn't know how to control their position in mid air to really hurt their backs. The other was a "can opener". This, was a far more effective splash for people that actually knew how to do it. It is basically the same as the "manu". The trick is to lean back as you enter the water. Instead of grabbing your knee at the height of your jump, you wait until just before you reach the water. By bringing one knee up towards your torso your body begins to rotate backwards. Your extended foot pierces the water so that as you flatten your back, the water doesn't slap it as it would in a belly flop. If timed just right you could soak the lifeguard sitting 30 feet away and 10 feet in the air. The most addicting thing about doing this is the intense concussion of water you feel as the bubble collapses around you. A good can-opener rattles your head. You know you did it right if your body abruptly and completely stops moving down through the water just a couple of feet below the surface. You actually hear the concussion like an underwater bomb. "sssSSS-BOOM"

@michaelhill4033

Жыл бұрын

I used to do can openers too the other we would do we called a sleeper, but it's basically manu. We called it the sleeper because it looks like you are sleeping in a recliner as you hit the water then tilt back to make the splash effect

@CliveGregory

Жыл бұрын

As a kid I did the can opener but didn't have a name for it, other than bomb. You know you've done it right when you hear and feel the ka-boom. It gives more consistent results than a belly flop or legs tucked in.

@adil_ahnaf.08

Жыл бұрын

what the poor lifeguard do

@mitchd949

11 ай бұрын

Yep, can opener and cannon-ball were two classics. Another was "the preacher" or "preacher's seat" which seems to exactly be the "manu." The biggier, heavier kids were always better at making huge splashes because they were obviously displacing more water. I used to do another dive where you'd fold yourself into a U shape and let your hands and feet go into the water first, then after your belly hit you sort of turned the U inside out and it would make a nice splash...can't recall the name of such a dive.

@3DPDK

11 ай бұрын

@@mitchd949 I was on the diving team most of my teen years. The "U"dive you describe was a "throw-away" or an intentional "fail dive". If you were in competition with another team and found yourself ridiculously ahead in points, you would do this on a dive you normally didn't score well on to sort of even the competition. We called it the "duh dive". Because your feet and hands enter the water at the same time it can't possibly be counted as any type of legitimate dive, and get's scored '0' points. In this case you didn't try to make a big splash - if you got the judges wet they tended to score lower on your remaining dives.

You've just solved an old childhood mystery. My brothers and I would have "highest splash" contests, and sometimes we'd generate HUGE splashes seemingly at random. None of us were able to narrow down exactly what we were doing to make them.

@fiusionmaster3241

Жыл бұрын

Cool

@Foshizzle4561

Жыл бұрын

Just learned about this. Gotta love when things come full circle.

@itoibo4208

Жыл бұрын

That should be an Olympic sport. I would watch it.

@kingandon4279

Жыл бұрын

Whatching education content more and more and you’ll find all the secrets to life 😉

@VIKTORSCHAUBERGERscammersONyt

Жыл бұрын

And you've gotten nowhere closer with this failure in backyard tinkering/repeating.

gotta love a person who can explain science so well, thank you. you make it very easy to understand.

@Lamiishere

Жыл бұрын

Cringe Af 😂

@ComputerPhysicsC

Жыл бұрын

@@Lamiishere no

@whoahwtfhuh

Жыл бұрын

We need meth

@mailgg4427

Жыл бұрын

@@Lamiishere shut up normie

@amentia

Жыл бұрын

@@Lamiishere 🤔 why tho?

We did these at the public pool. There's two versions. The can opener, which is a cannonball holding one knee only and keeping one leg straight out in front. You have to hit the surface tilted back at about forty degrees. The second was the chair. After springing off the board you a assumed the back lean like the can opener but froze in a seated position with your arms tucked into your sides with your palms covering your eyes. Getting the angle right doesn't take long. You know you did it right when you hear the tremendous thump of the water cavity collapsing underwater.

@theWZZA

Жыл бұрын

My friend taught me the can opener. He mentioned to grab your knee and crank backwards with your whole body. In that way, vert similar to what was described in the video.

One thing I love about Action Lab is you never know what new topic it’s going to cover. It’s almost always something fascinating that I didn’t know was a thing. And, of course, explained so the physics can be grasped by a non-physicist.

Interesting. At the pool we would always do a "cannon ball" and make a big splash. But the biggest splash was made by a "can opener". I would jump in feet first, tuck one knee in, and on impact lean back to hear a loud "boom". That's when I knew the splash was really high. Knowing how to control it allowed you to direct it and... make the lifeguard wet.

@grubalaboocreosote4774

Жыл бұрын

We used to see who could hit the ceiling of the YMCA the hardest with water. I couldn’t remember the name of it.

@OkSear

Жыл бұрын

Tf is can opener

@SlinkyD

Жыл бұрын

I thought the name "can opener" was only used in Memphis. The more I know... When he described the Manu, I couldn't help but think the technique is the inverse of the can opener. Then I thought about the "swan bomb". You start off with a swan dive and tuck into a ball, head first into the water. That make a bigger splash than the can opener if you do it right.

@happyman6102

Жыл бұрын

@@SlinkyD What you call a swan bomb we called suicides

@SlinkyD

Жыл бұрын

@@happyman6102 Our suicides was a regular dive where you put your hands on your hips and did like a 45° bend like doing a jacknife before you entered. It was more of a psychological challenge. Bigger stakes when you do it near the bank in the 3". I just realized danger and elegance was a big part of our swimming style in the hood.

I use to Manu bomb as a kid all the time. My technic was to jump in like you're sitting on a chair, slightly laid back, then when submerged in the water flatten out such that you make a bigger hole for the resulting upward rush for the splash. If you do it correctly, the splash should sound like a loud thud from the shock wave (especially in a pool). This bomb technic is a very Kiwi thing, especially among Maori children.

@Bishop0178

Жыл бұрын

We did the same thing but also used to pull one knee to the chest that way we were automatically rolling backwards as soon as we hit the the water. Fun times

@donovansun5470

Жыл бұрын

Aloha! Here in Hawai’i manu bombing is popular as well. I had no idea it was invented in New Zealand. Do you have any more info of who originated the bomb?

@AutPen38

Жыл бұрын

Children have presumably been trying to make big splashes since the time we lived in caves. The practice probably got perfected in communities that didn't have access to things like Gameboys and PlayStations until much much later.

@Horus-Lupercal

Жыл бұрын

@@donovansun5470 Probably a guy called "Manu", it's a Samoan word/name.

@matthewmackey7901

Жыл бұрын

@@Bishop0178 In the midwest of the United States we call that the 'Can Opener!' Great for getting the lifeguard on duty at the pool soaked.

I worked as a lifeguard in a pool for quite a few years and we were always messing about doing "Bombs" from various diving boards to see who could make the largest splash. Its interesting to see the actual physics behind it.

I've seen those videos a bunch of times and I had ideas about how it worked, but wanted to investigate more. And here you are. Thanks man.

We used to call it a "Can Opener" The only difference is you grab one knee and pull it tight against your chest while leaving the other leg extended, once your foot of the extended leg touches the water, you wold lean back and continue to fall into the water at an angle. . I remember how it would sound underwater. I never really thought about it but now I know that the sound it created was the void cavatating.

@Leonardokite

Жыл бұрын

Yep, that's the way I remember it.

@Bob5mith

Жыл бұрын

I remember that one, but my favorite was the "watermelon." It starts like a swan dive but you tuck and roll just before hitting the water. Watching this video, I realized the common action is using your back to make the biggest void without just landing flat. Maybe I just wasn't very good at the can opener and cannon ball, but I could do the watermelon well and it looks crazy. It also gets your head close to the collapsing void to make that part more intense.

@kasuraga

Жыл бұрын

YEAH can opener

@trialbyicecream

Жыл бұрын

When I learned the can opener it was all I wanted to do. No one beat me in splash competitions ever again.

@johanneslinnemann6660

Жыл бұрын

In germany jumping in like that is called 'Arschbombe', literally ass-bomb 😉

I'm amazed he hit the falling ball with the up-shooting water.

@magearamil8626

Жыл бұрын

Noone talks about it in comments but that is some next level timing and throw + jump coordination damn

@russchadwell

Жыл бұрын

@jimmy Burnett I throw the ball and jump: ball goes next door. I land in the sand for some reason. ... NAILED IT!!!

I just realized during your ball drop experiment that this is a great analogy for what happens during a lightning strike. The initial bolt rips the air apart and creates a cavity in the atmosphere, and when it slams back shut, the "jet" of air it creates is perceived as thunder. I wonder if a literal jet of air is created in the upper atmosphere and if this could have anything to do with sprites, jets and elves (the atmospheric anomalies, not the creatures).

@ObservationofLimits

Жыл бұрын

That's not accurate.

@joho0

Жыл бұрын

@@ObservationofLimits Please elaborate

@captainotto

Жыл бұрын

@@joho0 I think what you're hearing with thunder is the actual expansion shockwave from the superheated air. Inside the lightning bolt you have high temperature AND pressure. Both components influence the sound effect. On a side note, that high temp/pressure is why NOx is formed naturally from lightning. There is some amount of collapsing air that does get transformed into sound, but that pales in energy compared to the expansion wave. Maybe you could hear it if not for the expansion wave itself (crack) combined with the late arrival of the expansion wave from the upper portions of the bolt (rumble). I don't know what causes sprites, jets, or elves, but my guess is the physics of lightning change at high altitude because you have lower temperature, air pressure, CO2, and H2O gas constituents the higher you go.

This seems closely related to how a shaped charge explosive can penetrate crazy thicknesses of steel plate. It always amazes me how a relatively small diameter hole can keep going and going through a couple feet (or more) of steel, without even "mushrooming" out and dissipating.

@chemieju6305

Жыл бұрын

I was about to coment this, the way the cavity closes and creates a jet by pinching the material is surprisingly simmilar

This also perfectly explains the toilet splashback bidet effect. Nice work!

@johnvriezen4696

Жыл бұрын

There is a Smarter Every Day video covering this exact thing.

The Slow Mo Guys did an amazing experiment inside a wave simulator that has complete round basin that can generate waves from all sides, and they do this, not by dropping in a round object, but to crash precise waves into the center, giving the same effect of a very high jet.

@Lifesizemortal

Жыл бұрын

A rogue wave!

@ashutoshmahapatra537

Жыл бұрын

Yes exactly, I was thinking I saw this before somewhere there you go!

It's amazing how much you can capture with that slow mo camera. It doesn't look like anything without it but MAN does it look cool when slowed down!

I was just searching action lab videos hoping he already made a vid on it and sure enough he did! Man has vids for everything!!! So grateful 👍🏼

I can remember as a kid growing up my family would visit the Okere Falls near Rotoiti (New Zealand) and there is a place here that all the locals used to jump of a high cliff into the river below where the water was very deep. I took a lot to build the courage to jump this height and at this height you made sure you kept your body straight and upright and hit the water feet first. I can remember one day seeing a group of local Maori teenagers who decided to manu from this jump height.

@johnloosemore9949

Жыл бұрын

You kinda left us hanging there.

@magearamil8626

Жыл бұрын

@@johnloosemore9949 he left us "jumping"

@johannesaskehov

Жыл бұрын

So how far up did the splash water travel then?

@jxqyr

Жыл бұрын

@@YTho-ev1ej my favourite summer pastime 😂 The water is always freezing tho so can’t wait for it to get a lil warmer lol

@coreygossman6243

Жыл бұрын

@@johannesaskehov The splash of their souls traveled straight up to heaven

You just explained Poseidon's kiss without having to mention it. 😂

I don't think I've even been following James that long, probably a bit over a year, but it seems like the channel has grown MASSIVELY. I don't remember seeing his views go into the tens of millions per video back then! Maybe they were, but either way I'm very happy for his success.

This was a huge thing amongst kids back in the 70s wherever there was something to jump into water ,trees,bridges anything

I don't know how you do it... Every video you release is just so interesting and educational. Love it!!

@guatagel2454

Жыл бұрын

Oh, I know: he goes to the point.

This should have been called the toilet water jet.

@G_____

Жыл бұрын

I’m taking a shit reading this

@4424673

Жыл бұрын

Poseidon's kiss

@kavorkaa

Жыл бұрын

AKA Neptunes kiss

@atpray

Жыл бұрын

Oh man, now I know.

@KrlsOtc

Жыл бұрын

Just put toilet paper in the water before you take a dump and problem solved 😂😂😂😂😂

I did a manu once unintentionally once at the public pool while doing a can opener off the high dive. I went what felt like 6 feet deep before the water actually started closing above me, and the splash was enormous. I could never quite figure out how to do it again on purpose, so it was really cool to learn that other people have mastered it!

the concept seemed pretty intuitive to me because i often play around with water (anything physics-y) during my swim practice, and i kinda just learned how water behaves in certain conditions

A family friend that used to watch us as kids taught me how to do this and I used to do it all the time. We would just hold onto the ball, not throw it. I also did it all the time with no ball just for the splash. You always knew when you did it perfectly by the sound it made under water, and when there was a bunch of pissed off people when you came up. I never knew it had a name until now.

It’s like a shape charge of water

@Lumbeelegend

Жыл бұрын

Haven't heard "Shape Charge" in awhile. Combat engineer?

@jonathanperry8331

Жыл бұрын

That's a good analogy. What I'm wondering is why did he need the electromagnet? He could have just dropped it.

@pakornkeatinsawang278

Жыл бұрын

@@jonathanperry8331 I'd say he wanted to keep every drop consistent and straight

@stevenaylor5163

Жыл бұрын

@jonathan Perry because he’s next level smart.

Similar to a manu, as a kid we used to do a "jackknife". You'd jump into the water while holding 1 knee and your other leg extended. As you entered the water, you'd fall backwards letting your extended leg rise above the rest of your body. Made for great splashes. Holding your knee helped to lean back farther and faster for larger splashes.

I used to always make splashes like this but with my hands and they make a really cool sound, a frequency sweep from low to high pitch

Even a single piece of toilet tissue laid in the toilet bowl can prevent all undesired splash back from reaching your fundament. The water surface of toilet bowls is small and the depth often shallow so after the first impact, any subsequent stool that goes into freefall is likely to interact with earlier deposits preventing any subsequent jets. No one else (of the admittedly few) with whom I've discussed this has done it so this doesn't appear to be a widespread technique amongst people I know and I am inordinately proud of making this discovery myself. Yet there is a German language term for it translating to "building a raft". It doesn't take a raft though, one square works perfectly and is just that little bit more environmentally and economically friendly. I'm sure others have made their own independent discoveries like me, but it can be a rather awkward thing to share. Maybe someone out there is brave enough to start a social movement about this movement.

@jxqyr

Жыл бұрын

I only learnt about this technique a year ago and it has changed my life 😂

@Danuxsy

Жыл бұрын

but I love feeling that jet pierce into my butthole, cleaning me both in and out ykno.

@iteragami5078

Жыл бұрын

Destin from smartereveryday did a video on poop splash a while ago

@joshyoung1440

Жыл бұрын

"Inordinately proud of discovering this myself" you must be German 😂 that, and "fundament" is a rather German turn of phrase to my linguistically trained ear lol. I truly must use that.

@joshyoung1440

Жыл бұрын

@@iteragami5078 of COURSE he did lmao. How could he not? The collapse of the water column is so smooth and _laminar_

This looks very similar to the Munroe effect that is used in high-explosive-anti-tank ("HEAT") warheads (hollow charges) to create a very focused and high velocity stream of molten metal to penetrate a tank's armor.

@KClO3

Жыл бұрын

It's literally the same thing happening. Ofcourse with much lower velocities

@OnTheRiver66

Жыл бұрын

It is actually the heat from the plasma jet that cuts the hole in the armor, the molten copper cone follows after and can go through the hole, but sometimes gets stuck in the hole. I saw pieces of armor punctured by shaped charges at Aberdeen Proving Ground. Some of the armor plates had the once molten cone wedged inside the hole, looked somewhat like a copper icicle. But unlike the manu bomb the energy comes from the high explosive, not the cone used to shape the explosive or anything surrounding the charge.

@KClO3

Жыл бұрын

@@OnTheRiver66 bs. The cone is a superheated jet of copper that goes so fast it just pushes the armoe out of the way. This is a fact.

@OnTheRiver66

Жыл бұрын

@@KClO3 then why do some of the armor plates have the cooled copper cone stuck half in and half out of the hole? That cannot happen if the molten copper first made the hole - the plasma moves many times faster than the copper and is gone before the copper hits the hole. I received my training at Aberdeen Proving Ground as an Ordnance officer and I know that copper as well as other materials are used to hold the cavity shape in the explosive just long enough for the plasma jet to form during detonation. Copper works well and that is the only reason it is usually used. Where did you train?

@OnTheRiver66

Жыл бұрын

I also later worked for a company that made a product that significantly reduced some of the force of shaped charges and that product had nothing to do with the copper liner but interacted with the high temperature plasma from the explosive itself.

Since I was a young boy I’ve done a similar jump called the ‘can opener’ wherein one knee is pulled up to the chest but same body-back motion as the manu. Always gets a huge water jet!

On another note, this is probably why canonballs in naval warfare were quite effective for a long time even if they do not hit the target itself and only lands somewhere near, because then then other than the manu bomb effect, when the water fills up the cavity of impact, it also pulls water from its surroundings disturbing the area where the target is and possibly capsizing it if enough disturbance was made. Now, of course, everyone has deadly missiles.

@AutPen38

Жыл бұрын

Fascinating. I'd never thought of that, but it sounds legitimate. I'm very glad that my local swimming pool has banned cannonballs and missiles, as my galleon has sprung a leak. ;)

U make science so easy to understand

Mesmerizing. Very cool to see the close up details, fluid dynamics are wild

As a kid (now 56) my friends and I would do what is called a "jackknife" from the high dive and could aim our splash.....usually at the lifeguard on duty! Same principle, hit the water with your body at about a 45* angle with one leg bent up towards your abdomen held by your hands and when your foot touches the water you quickly lean back to create the same motion and effect as mentioned in this video. Good explanation of what my 12y/o self did so many years ago. Even if the science behind it didn't matter to me before, it brought back a lot of forgotten memories of being young and having some innocent fun. Good video!

ive been making splashes like this since i was a kid and had no idea they had a name or a backstory like this. we called them can openers and just learned than if you hit the water the right way you get a huge splash. cool to learn all of this years now as an adult

I didnt knew that was called a Manu! Sometime in my teenage years i found out you can make a really big splash if you land "sitting" with your legs straight out, and as you hit the water, lay flat fast. Now i know why, thanks!

Amazing physics! I never heard of this Manu but looks like fun!

Looks like something you'd see when watching someone try to finish a video game as fast as possible.

The counter clockwise twist of the rising column is mesmerizing

This explains something that I was intrigued by when I was a kid. Growing up in the tropics, a lot of time was spent staring at the rain drops, and each drop used to throw a larger jet of water into the air as it hit the puddle - I think this is the reason behind that. Thank you!

@danielch6662

Жыл бұрын

I grew up in the tropics as well. But didn't spend anytime staring at raindrops falling on puddles. But I still live in the tropics. Never too late to start. 😁

@cliffmathew

Жыл бұрын

@@danielch6662 Southern Indian houses that I lived in had a "verandah" in front, and it was a pleasure to sit outside watching raindrops (except during lightning storms)

I’ve enjoyed your videos for years and you have inspired several useful inventions I’ve made. Thank you for all you do!

@TheActionLab

Жыл бұрын

thank you!

@jonathanperry8331

Жыл бұрын

@@TheActionLab why are galaxies in a disc instead of a sphere?

@pinakadhara7650

Жыл бұрын

​@@jonathanperry8331 May be because they are spinning. If you imagine multiple balls connected to the end of a rod which spins, they would form a disc like structure.

@jonathanperry8331

Жыл бұрын

@@pinakadhara7650 well I guess that's the big mystery is what is the rod? We don't really understand gravity yet but what's holding all of this together? You have your dark matter theory and the maybe there's a black hole at the center of the Galaxy. I hope they figure this out in my lifetime but I kind of doubt it.

@spencercase5370

Жыл бұрын

In order for material to stay in orbit, the momentum trying to go strait has to balance with the force of gravity pushing it to center. This only works if the material is rotating about the center of the gravitational pull. To understand this, imagine a spherical galaxy. As it spins along an axis, there will be stars spinning at the top of the sphere close to the axis. The inertia will be pushing the stars away from the axis, but not away from the center of the sphere, but gravity would pull towards the center of the sphere. This would make the stars “fall” towards the equator of the galaxy, where they would collide with stuff and either fall towards center or fall into orbit around the equator

We had a couple of techniques that we called the “can opener” and the “coffin.” Both were similar to the Manu. We would jump in butt downwards, then force our back into the water at the right moment. If we did them correctly, we created huge splashes. When we would swim in indoor pools, we would try and see who could get the most water into the ceiling. We also had a belly down splash maker called the “Fuji.” It was almost as impressive as the others.

@AutPen38

Жыл бұрын

I don't think this was ever a thing in boring Britain, particularly in the seventies and eighties. All our swimming pools famously had signs up that said "No bombing" with a picture of a boy curled up like a ball. They also said "No petting" which always made me laugh. There was nothing to say you couldn't pee in the pool though, so that's what British kids did to amuse themselves.

When i was a Kid i seen this olympic diver doing a double back manu off a handstand at our town pools..His form was tremedously perfect

We called it the coffin, arms crossed, feet first and then as feet enter the water your body, slightly bent, overtakes your feet thereby creating the large cavity mentioned. Also it can cause, if done right, quite a clap noise when the water collapses back. We were quickly banned from doing that due to the noise and the wet ceiling, haha, great fun though, thanks for explaining the mechanics behind it 🙂

@999nevamind

Жыл бұрын

A coffin and a manu are completely different

@antitheist9976

Жыл бұрын

@@999nevamind They look remarkably similar to me, the way the guy entered the water, only difference seems to be the arm crossing.

@999nevamind

Жыл бұрын

@@antitheist9976 no, a coffin you basically stay straight, you have to tuck for a manu and then roll out once you get into the water

@antitheist9976

Жыл бұрын

@@999nevamind Where I am from, when jumping into the water whilst making the splash and the cavity that causes it, we called it the coffin, due to the crossing of the arms.

@ibeatyoutubecircumventingy6344

Жыл бұрын

bro how to say you went swimming but never actually went swimming without telling us you cant swim

This is also how torpedoes work. Their explosive charge doesn't do the damage itself, it creates an air cavity and the water jet punches through the armor

We need this as a bigger experiment to go to space!

We used to call this a "cannon ball".

We used to call that the Jack knife to get that big splash.

@daviddudeskie6940

Жыл бұрын

Yeah!...it wasn't invented by New Zealanders. He has obviously never been to a public pool or swimming hole in this country.

Can confirm. I remember doing this as a kid ... And adult. There's a variation of it where you run as fast as possible, that creates a very forceful wave.

My older brother went to a "sports school" in the late 70's, which was actually a camp for troubled kids in Whangarei, New Zealand. Him and a group of his friends would go to Whangarei Falls, a local swimming hole and have competitions to see who could create the biggest splash. They developed many different techniques for creating a "Bomb" the most successful being the one mentioned in this video. The name of that school was Maunu Health Camp.

I've seen others mention it so my vote is for the "Can Opener". But part of the skill was controlling the spray. While sometimes for height, also to spray people standing around the pool. You could get some distance to the back row lounges! And I found a properly performed "belly flop" did not hurt and made a great side splash.

So this is what happened when u drop a giant crap in toilet without paper on the surface of water🤔

When I was a kid, I was the master of creating a huge splash of water. We always did it from the high dive in an attempt to soak the lifegaurd. When I was a kid, I always called them a "Sleeper" because of when laying back right after entry into the water. Never knew they were actually called a Manu. I was doing this nearly 45-50 years ago!

I had no idea there was a name "Manu" for it, but when I was a kid, many decades ago, we used to "bomb" like this for fun. Somehow I doubt anyone in recent memory "invented" it. I suspect people have been doing it for centuries.

I have only known it as a water bomb and it was already well known how to do it when I first learnt and started doing it in the early 70's here in Melbourne Australia! I'm surprised to hear that it was invented in New Zealand..... No date was given as to when it was discovered? The video shows the guy going in backwards, we also could achieve it going in forwards which I believe produced better results, you could actually aim where you wanted the water to end up, the girls unfortunately didn't find it as amusing as we did but it did get their attention! They would always make sure that they knew where you are at all times LoL.... One deliberate splash, lots of apologies and eventually a date.

For the most repeatable and forgiving setup, I hit in a tight V and almost immediately try to flatten out, like an backwards parachute. Just trying to slow down as quickly as possible while also entering the water as smoothly as possible. I've done it as a dive while touching my toes and got huge results, but there was less room for error

Growing up in the rural northeastern US, we called that type of cannonball a canopener

Crazy that no one ever jumped in the water until someone From New Zealand did it.

Whoever's reading this, i pray that whatever you're going through gets better and whatever you're struggling with or worrying about is going to be fine and that everyone has a fantastic day! Amen

@yesnt1910

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Thanks!

@MysticLGD

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Thx

@qaz3823

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Bot lol 😆

@vlgrx

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first guy is a bot

@ernestkhalimov9368

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Wtf, a certified Bot?

We called it a jackknife, one leg straight the other bent, holding it with your arms, as you enter the water foot first you pivot backwards creating a larger cavity. We used to see who could hit the ceiling of the dock (about 20’ high) by jumping into an empty houseboat slip. Most of us could easily hit the ceiling.

This channel is underrated and this guy deserves to be in discovery channel

We called it a ‘reverse staple’ - mainly started doing it after a few failed staple dives and badly hurting chests 😅

Thanks for the video.

I learned something new and unexpected. Nice one!

Would be fun to try and launch a projectile with this effect. You could even justify using TWO electromagnets and program the delay in the projectile's drop to optimize the force it receives or the height it gets to. Would be interesting.

When I was young, we did "Can Openers". I'm old AF, and sure that technology has improved dramatically since.

I used to use the running honeypot - most ball-like bombing technique. It was great for soaking bystanders at the opposite edge of the pool - not for the vertical spout.

I love this guy... Thanks from NZ.

Great video. It takes us all back to our childhoods and from around the world too.

Grew up in the east of The Netherlands, we did this all the time when we went swimming. I basically went for the illustrated technique.

I like how the initial manu creates another manu as it falls back down

When we were kids we spent a LOT of time doing this. You straighten out after you hit & go under the water to get the biggest splash. We used to call it 'lay-backs' in Australia.

great analysis !

We called it a jackknife back in the late 80s. Contests all summer at the community pool.

Imma try this next year when the pools are open again I’m definitely gonna remember that

The fusion reactor I'm working on operates on the same principle of inward focused waves.

The pressure & momentum of the water entering the cavity that was caused by the man that jumped in the water produces a vertical splash that launches the ball up.

In olympics, Divers try to minimize this splash as it counts to the score. They bend their body in such a way that area of surface that comes in contact with water would be very less and hence less splash

Ah I like this dude I always see his shorts so this is cool to watch

When I was a kid we used to call it a "can opener"... Performed slightly differently, but generates the same effect.

I used to do this all the time as a kid growing up in the 80s. I called it the jackknife, because I would grab one leg with my arm, and jump in a bent position. As soon as I hit the water I would straighten the leg up and lean back. It caused overpressure which launched a splash straight up - usually. I got good at aiming it and I could actually control the direction - somewhat - it would fly. So I could splash people sitting on the deck :D Everyone thinking they were cool doing the cannon ball, and I could launch a splash 20 feet into the air :D I remember you knew when you got the sweet spot. You could feel the vacuum under you, and the water rushing up. You kind of "fell" into the hole from the water. It made this "whomp whomp" sound, with the second whomp usually louder and more forceful than the first. It was a very unique feeling that is hard to describe. If you did it you know it though.

A bomb that goes a bit higher than a manu is an easy one called the coffin, you jump in feet first but as soon as your feet touch the water you lean back as fast as you can

The creek they are swimming at is Harvey's creek far north queensland. Great place during summer.

There's this famous ad in New Zealand of this Maori kid teaching Santa Claus how to pop a Manu

I never knew this had a name, but you can get a pretty decent one with a regular "cannonball" landing on your back. Although we considered it a failure, were generally going for "largest volume splash" instead of "highest altitude splash" :D I've also seen it (without being on purpose) from people who are good at making straight dives. Going cleanly into the water makes a nice cavity.

In Oz as a kid we did this as well never called it a Manu it was called the Jerry bomb but I always got a way bigger splash from doing what was called a "Horsie" . Same principle but in reverse, as you're falling you have your stomach pushed forward with your back arched backwards with arms and legs in a parachute free falling position and just before hitting the water you flex in the opposite direction, have your arms and legs hit the water 1st and just as your torso breaks the water, flex your stomach forward again so there is hopefully a pocket of air that is now being compressed even hard into the water. Same principle as having your hand flat and making a splash or cupping your hand and then flattening it out as you hit the water.

I used to swim and dive competitively back in the seventies and I could do what they call a can opener and it would shoot the water straight up just like you described I never know how it worked though thanks for clearing that up looking forward to your next video catch you on the flip side my brother. ✌️

I discovered something like this and was telling someone at work but was looking at the force trying to keep an object down with an airpocket.

In my youth, we called it a “can opener”. It was the same theory, but, the person would cradle one knee with both hands as the water was entered. With practice, the jet of water could be directed at a modest angle. Innocent and dry sun bathers could be soaked from a distance. What fun!

We used to call it the "can opener." Whenever we'd go to the pool and people were talking turns on the diving board, and someone pulled out a can of tuna (back then they didn't have the pull tabs) and looked at each friend imploringly when one finally pulled out a metal scissor-esque device, that was a can opener.

We used to do the can opener off the diving board.

the first time I heard about Manu Bomb. In my childhood we had several types of water bombs. - Brett (board) (very similar to Manu Bomb) - Totenbein (dead leg) (one leg stretched, the other pulled to the chest) - Kopfbombe (head bomb) (as vertical as possible, head first and roll in just before touching the water) - Schwalbe (Swallow) (as horizontal as possible, belly first, just before touching the water pull in arms and leg and then stretch back through)

2:51 should be "so almost the entire volume of the cavity collapses in on itself." You can still see the bottom portion of the cavity bubble that doesn't joint the rest

We jump in similar way and we call it bomb, but instead of spreading out, you stay curled up to create bigger cavity. One disadvantage is that your head is on top and cavity can colapse on your head with quite a concusive force, but it's realy something special to hear.

Fun fact you can see these on the impact creates on the moon. The cavity jet is also how anti-tank armour penetrating shells work