If you're wondering why the boat never cracked under thermal stress, it's because they made it out of quartz glass! How cool is that! You can also discuss this video on REDDIT: stvmld.com/xf-isn5j Check out Anker 521 Portable Power Station: ankerfast.club/3vq4RRe (#ad)

@sixtenwidlund4258

Жыл бұрын

Nice video!

@robertschnobert9090

Жыл бұрын

I love you, Steve! 🌈

@khadimhusen

Жыл бұрын

Great video, I wonder what would happened if heat is given from the top side.

@littlebacchus216

Жыл бұрын

How much did custom made quartz glassware cost? When I was at uni we had to sign glassware in and out and pay if we broke it... I broke so many Graham condensers.

@nobody-ek5bx

Жыл бұрын

but what happens if you make a T sektion with the pipes unter the boat and use 4 one way valve to use the sucktion at the front and the push at the back of the boat? is it better or more eficient now?

Those glassmakers did an incredible job.

@reidflemingworldstoughestm1394

Жыл бұрын

probably the most notoriety they've ever had

@pleasedontwatchthese9593

Жыл бұрын

i would like a video seeing how they made it

@schnizzyfizz7832

Жыл бұрын

@@pleasedontwatchthese9593 Gas torches (maybe oxygen/acetylene to get extra high temp, idk what quartz glass needs to melt), bending tools and various diameter glass tubes. I saw a video from a university where they made custom lab glassware. Also proper cooling to avoid cracking as with all glass. So prob some oven to let it gradually cool. Idk what that is called, but I am very sure there is all kinds of glass making terms. Glass is a fascinating material.

@anthonynelson6671

Жыл бұрын

Knowing just a little of how tricky glass can be I was wondering how much that little glass boat costs. I've seen how expensive high precision lab glass can be. It's an interesting yet different world of things.

@comradegarrett1202

Жыл бұрын

@@schnizzyfizz7832 the oven is called a kiln and the process of putting glass in a kiln to keep it from cracking is called annealing.

Excellent. If I ever find myself on a deserted island with an oil drum, a couple of pipes, and enough wood to make a raft and bonfire, I know how to escape.

@JD2jr.

Жыл бұрын

Now I want to see somebody build a human-size one of these...

@blackmber

Жыл бұрын

That’s right, put your signal fire to _work._

@flagmichael

Жыл бұрын

@@blackmber "I don't know, Captain. The signal fire seems to be moving!"

@besquareorbethere8093

Жыл бұрын

Hopefully you can keep that fire going long enough to cross the 7 seas.

@mucia55

Жыл бұрын

Just tell me the exact max d of the pipes to maintain the capillary effect of water preventing the vapor to move over inside it and I'm building it.

for forward motion, the shape of the boat also acts as a latching/winching mechanism. It glides forward in the water easier than it glides backwards, due to the hull shape.

@craigcole9337

Жыл бұрын

This is correct. You put a corner in the front of the boat, so it sluces easier. In the back of the boat is a wall, which absorbs energy. The greater area of the wall blocks the boat going backwards. It’s the same reason a man in a rowboat will expend WAY more energy rowing it backwards, rather than forwards.

@matthewbarncord3984

Жыл бұрын

@@craigcole9337 on the other hand, I've seen these boats made out of plain sardine cans, so there must be some net forward gain.

@DeanTheDoctor

Жыл бұрын

Well said guys! 😊🌎💖

@marcopruscini1603

Жыл бұрын

Water on speed wants to stay in direction, here to the back, as long as it moves fast. Sucked water (or any other medium) tries to get the easiest and shortest way and that is every possible direction. That means, the reaktion force of the pressure water is forward and of the sucked water is in almost every direction and eleminates most of it by it self. May be the physical terms are not correct because of my non Oxford english...😉

@germanvtg

Жыл бұрын

That is correct but as he said, when the water is coming in the tube it has less velocity than when is going outside. If you answer me I can give you the fluid dynamic formula which models this phenomenon. You can see it when an octopus is running away, it takes water with its siphon wide open and then it makes his siphon smaller to take the water away and gain velocity.

I am 69 years old, when I was a child my father brought home a metal Pop-Pop boat. I now have one to amaze my Grandchildren. Thank you for your video explaining how they work.

@blaisebaileyfinnegan8202

Жыл бұрын

I'm 200 hundred years old, when I was a child my father was a mercenary returning from the Java War fighting for the Dutch and he brought home a metal pop-pop boat. I now have one to amaze my great-great-great-great-great-great grand children.

@buckfizzard291

Жыл бұрын

@@blaisebaileyfinnegan8202 why would you disrespect the man like that

@blaisebaileyfinnegan8202

Жыл бұрын

@@buckfizzard291 Because I can, homeboy.

@buckfizzard291

Жыл бұрын

@@blaisebaileyfinnegan8202 well that's immature

@amarnamarpan

Жыл бұрын

Your grandchildren are so lucky. ☺️☺️👍🏼

I remember seeing one of these in ponyo when I was little, I thought it was so cool. Still do actually, would love to have a little boat like that big enough for me to actually fit in

@Laurpud

Жыл бұрын

OMG, right? That would be so cool to putter around in!

@rachelcookie321

Жыл бұрын

Wait, they have one of these in ponyo? I only watched the movie a couple years ago and don’t remember seeing this!

@v_Shami

Жыл бұрын

@@rachelcookie321 yeah, it's how sosuke and ponyo go around to look for his mom once the water rises

@rachelcookie321

Жыл бұрын

@@v_Shami oh, I thought that was just a regular toy boat. I didn’t realise it was one of these.

@korwynze6288

Жыл бұрын

same i thought of Ponyo right away! ahh what nostalgia

I'd assume that the shape of the boat also plays a factor in its forward trajectory as the bow of the boat is more streamlined for less resistance while the stern of the boat is not.

@khalilahd.

Жыл бұрын

Yeah I definitely agree

@Lezenda

Жыл бұрын

oh well, there I go with my comment (17 min after you), thinking that I am the smartest :)

@archbox8593

Жыл бұрын

In that case it would be interesting to put the tube openings in the front and see if this would make it still move forward?🤔

@chorusofoddities

Жыл бұрын

He cut the bit where he mentioned that from the video, thinking it wouldn't interesting anyone, he said in another comment

@bbugl

Жыл бұрын

making a symmetrical boat would be interesting.

i have only seen this toy from Ponyo and it has been in the back of my mind. thank you for the name of it, and explanation of how it works.

I've played with a dozen of these when I was little. They used to keep me entertained for hours. I have forever been wondering exactly how these boats worked. At last your glass boat has put an end to that. High five !

@ezioboiz-ieatchildren-

Жыл бұрын

You should already know this because this is taught in physics 💀

@DemoniteBL

Жыл бұрын

@@ezioboiz-ieatchildren- Not everyone learns the same things in school 💀

@ezioboiz-ieatchildren-

Жыл бұрын

@@DemoniteBL wait so you're 9 year old?

@DemoniteBL

Жыл бұрын

@@ezioboiz-ieatchildren- ?

@ezioboiz-ieatchildren-

Жыл бұрын

@@DemoniteBL i mean the physics taught in this video is basic physics you're taught.

"The batteries are just there for weight" - exactly what someone would say to hide their perpetual motion machine. You can't fool us!

@truongnguyenhongnhat6590

Жыл бұрын

ok

@leyrua

Жыл бұрын

😆

@truthbetold1855

Жыл бұрын

Haha yes, the ONLY thing he could find.. HAPPENED to be two AA batteries.. SUUUURRREEE LOL I think they call this hiding it in plain sight 🤣 kidding.

@hankholschuh7987

Жыл бұрын

@@truongnguyenhongnhat6590 it was a joke genius

@bstikkel

Жыл бұрын

If you do not believe the batteries really are only there for counterweight, have a look at the metal version. We had several of those and it really works the way it is demonstrated.

No-one could be disappointed with any good visual explanation - even if it makes your channel a 'transparent version' channel!

@khalilahd.

Жыл бұрын

Always the best content 💛

@desu38

Жыл бұрын

Right? It's like those cg graphics, but better.

@amicloud_yt

Жыл бұрын

Better than "pour things out of jars" channel

@sethgwiyo2250

Жыл бұрын

kzread.info/dash/bejne/naWms5StmJqreqw.html

@desu38

Жыл бұрын

@@amicloud_yt Well, I like NileRed

My dad and I built one of these for a science fair in 2nd grade. Won the fair and blew the teachers and judge away. We used coiled copper wire instead of a tank.

@mr_dillus

11 ай бұрын

Lies

@liahansen6896

9 ай бұрын

huh, do you remember how that worked with the wire? Like did you use the wire to essentially make a tank, or something else?

@tombig4011

9 ай бұрын

@@liahansen6896 sorry, it was small copper tube the we bent into a coil that the flame heated. Not wire.

Now imagine doing this with a full scale boat

@FrogEmpress

Жыл бұрын

Just like in ponyo!

@TTHJJD100

Жыл бұрын

Well the issue here with the pop pop boat is you still need heat that causes this process. Thus you still need a fuel like coal, gas, or wood. So we're back at the problem of needing a finite resource.

@JustRememberWhoYoureWorkingFor

Жыл бұрын

It would be a very slow and inefficient boat

@michaeldougherty6036

Жыл бұрын

@@JustRememberWhoYoureWorkingFor But at least you wouldn't be slap-chopping manatees and whales with a propeller. I wonder how well a solar powered heating filament could work, in place of a flame. I'm sure there could be a market for an environmental and sealife friendly put-put boat.

@bconroy328

Жыл бұрын

Ponyo!!!!!!!

I was introduced to the Pop-pop boat from Ponyo and always wondered how it worked. Amazing video, thanks for the explanation!

@Mattguy-lg3nr

Жыл бұрын

yea

@spunkyspaz

Жыл бұрын

Ponyo brought me here too. :)

@fotiacruz3911

Жыл бұрын

W movie

@kennethsizer6217

Жыл бұрын

Same!! 👍

@its_aj251

Жыл бұрын

Same

I saw a clip or two in this video with the engine running with asymmetric amounts of water in each tube (3:35). That's very strange. Other thermoacoustic engines require pretty precise resonance matching between the engine cavity and the load to get any work done. In this case you've got two mismatched loads with competing resonances somehow popping at the same frequency. I'm guessing the mismatch must be minor enough to force synchronization but would like to see further tests. Does the amount of water in the tubes effect the frequency of the popinating? If you make one tube a little longer than the other so it contains more water by default will it still run?

@SteveMould

Жыл бұрын

That's a really good point. Happy to send you the boat if you want to run some test. Drop me an email if you're interested steve@stevemould.com

@littlejackalo5326

Жыл бұрын

How does this comment not have a single like? Why was it buried? Nighthawk in light is a huge KZreadr who does similar videos and this comment should have way more likes..

@Lets-Talk-Law

Жыл бұрын

@@littlejackalo5326 The bot presence is strong on youtube

@Resonanttheme

Жыл бұрын

That brought to mind a clip "Stirling Twins Pogo Engine", two syringes driven from a common chamber, one deciding to bounce higher then the other adjusting displacement.

@Resonanttheme

Жыл бұрын

@@MadScientist267 And the heat transfer properties of quartz is different. Ideally, if you could maintain a steam hammer effect, you'd get a lot of thrust.

I always like to put my guess for the big question on these types of videos… I’m at 7:30 and we’re about to figure it out. Basically, even though water is going in and out, theoretically putting the same force on the boat each time in opposite directions, we should stay still or perhaps shift back and forth slightly. However, because of the shape of the hull, there is very little resistance when moving forwards, and a large drag resistance when moving backwards. So even though the same force is imparted on the boat, the boat slides forwards easily, but doesn’t ever want to slide backwards.

@bencejoful

Жыл бұрын

That was my guess as well

@Games_and_Music

10 ай бұрын

And funnily he didn't even mention it. Although it's not the main reason, but it's definitely a big part of hydrodynamics overall. Now it might be kinda "interesting" to see a pop-pop installed backwards and see which force wins. Will the 'engine' win, or will it slowly wander backwards or sideways because of the reverse installment and contra hydrodynamics. And how much is needed to turn that result around.

I think the boat has a shape that helps forward movement and not bacwards, so it will tend to go forward even if you apply the same force in both directions.

@Layarion

Жыл бұрын

easy to test, just put this in a box and see if it still moves

@beaconblaster33

Жыл бұрын

@@Layarion one annoying thing is the word is "help" not "essential"

@Games_and_Music

10 ай бұрын

@@Layarion Yeah, the box will still move forwards, but probably less fast, or less 'guided'. The point about the directional flow of water is still true, so, like beaconblaster said, not essential, but definitely beneficial.

As you've probably already been told, the "water flowing into the pipes from all directions" explanation that you rejected is the same reason Feynman gave as to why his s-shaped water sprinkler wouldn't work backwards. So it might be interesting to run that experiment in a clear box, like Hero's engine in reverse.

@anotheral

Жыл бұрын

YES SOLVE THE FEYNMAN SPRINKLER PROBLEM FINALLY!

@Lastielion

Жыл бұрын

Any excuse for a clear box :D We all love that sweet, sweet visible physics

@jeeeeeeeeeeezus

Жыл бұрын

You'd see nothing illuminating doing the feyman sprinkler transparently.

@resintom852

Жыл бұрын

@@jeeeeeeeeeeezus you’re fun at parties I bet.

@shawniscoolerthanyou

Жыл бұрын

@@jeeeeeeeeeeezus adding dyes to the water could give a qualitative feel to the asymmetric flow between in and out.

The drawings you refer to with the metal tank show a tank that is very flat with a height that is very similar to the tubing (~1D in height and only a few tubing diameters in width), and is slanted down towards the tubing. Your glass tank is several times the tubing diameter in both height and width, and doesn't have the same fluid dynamics as the metal tank. The tubing in the glass system are perpendicular and not tangental to the tank, again causing different dynamics. These changes might acount for the tank not cycing like the metal system. However, the end result is "the same" type of oscilation but different efficiencies occuring in different locations.

@harrymoyes5069

7 ай бұрын

I think the top of the metal tank is also part of the resonant system, adding another enhancement to the system, missing from the glass boat. I'm guessing that it helps to contribute the pop-pop resonance notable in the tin boat, and absent in the glass version.

Fascinating, I was scratching my head pondering the dilemma of how it moved forward vs just back and forth. Very cool!

Oh I've always wanted one of these after watching Ponyo when they turn one giant and use it as a real boat! I wondered how well it would work if a large version was made

@groggers

Жыл бұрын

That's where I first saw these too! Led me to buy one on a trip to Berlin, but regrettably I've not yet tried it after 4 years... I think it's about time

@Gammix

Жыл бұрын

If it weren't for watching that movie, I probably wouldn't have clicked on this video

@Book_Thoughts

Жыл бұрын

I found you guys! I was looking for anyone who had watched Ponyo. I want a giant one two.

Actually more than resonance I think this is a nice example of limit-cycle oscillation, where a steady supply of energy (from the candle) produces an oscilatory motion.

@sethgwiyo2250

Жыл бұрын

kzread.info/dash/bejne/naWms5StmJqreqw.html

@velbythorngage

Жыл бұрын

Yeah I wish he'd gone into more detail there, I still don't get how a constant force from the candle results in oscillation, I'd expect the expanding gas to reach equilibrium (kind of like applying a candle to that syringe, it would expand but wouldn't oscillate)

@acters124

Жыл бұрын

​@@velbythorngage Candle does not provide a true constant energy to the glass and gas inside. it is providing an oscillating energy to the glass and inside gas that you can visibly see. It would be great if there is a way to pinpoint heat transfer to a single point without it leaking to the surrounding environment. however, entropy will exist in any lab environment. This whole boat is a practice in how imperfections provide a oscillation in energy levels in the system. How one uses the oscillating energy is a mystery, in this example it is used to drive a boat forward. Another example of using oscillating energy sources is in an AC system. In an ac system, an oscillating energy source changes pressure from one side to another in a continuous motion.

@sumdumbmick

Жыл бұрын

@@velbythorngage he'd have to know wtf he was talking about to go into more detail, though.

@lucasbiaggini

Жыл бұрын

@@acters124 wouldn't a resonating frequency be constant, while random oscillations would be random? I think simply measuring the frequency of the popping sound in one of this boats could pretty much settle it.

Played with this boat since my childhood. Always wondered how it actually works. Thanks a lot for this beautiful explanation!!

Most honest sponsorship/review out there. Love your videos and appreciate your approach to this. Cheers!

Reminds me a bit of a pulsejet engine, the way it oscillates to produce a net force. Obviously it's very different in a lot of (very big) ways but I can see some similarities in how they work

@reubeng2110

Жыл бұрын

my favorite was in the 50s and 60s scientist wanted to launch huge payloads into space using pulsed thermo nuclear explosions Kennedy shut that program down they did nuke testing and it works just like a nuclear powered missle

@ruskiwaffle1991

Жыл бұрын

@@reubeng2110 orion right?

@Nikarus2370

Жыл бұрын

@@ruskiwaffle1991 Well Orion IIRC was having a rocket in space propelled by dropping nuclear bombs behind it. There was another project exploring nuclear salt water rockets. Basically a nuclear reactive uranium (or plutonium or other) salt would be dissolved into water and stored in tanks with a lot of boron or other material to lower reactivity. Basically would work by spraying the fuel out the back through a nozzle lined with a moderator (like graphite) to cause a constant flow nuclear reaction out the back of the rocket. Scott Manley has a good video about it IIRC. A 3rd, (more feasible, and tested, adn I think Space X was makign some noise about bringing it back up) option is Nuclear Thermal. Instead of mixing fuel and oxidizer to burn (to make heat) to propel the rocket. You use the heat of a nuclear reactor (one running in a controlled fasion, and not actively exploding) to heat up your propellant.

@JohnDoe-rx3vn

Жыл бұрын

i think there's plenty of reason to call it a pulsejet

@Sacred_l0g1x

Жыл бұрын

STIRLING ENGINE 😆

I would be incredibly interested to see someone make a full-size version of this propulsion method

@icouldntthinkofagoodname7216

Жыл бұрын

I was thinking of a remote controlled rudder boat toy scale at first because the bigger it is, the cost also goes exponential.

@educationalpurposesmostly

Жыл бұрын

came here to say this

@TheCookiePup

Жыл бұрын

I'm worried that you would need a huge fire and/or the oscillation would be very slow, but I imagine you'd still get some forward motion.

@pleasedontwatchthese9593

Жыл бұрын

@@TheCookiePup maybe a lot of small engines

@SharpAssKnittingNeedles

Жыл бұрын

@@pleasedontwatchthese9593 Great idea!

This is very interesting, reminds me of a pulse jet, both initially seem like the forces should be balanced and no thrust should be produced, and both essentially consist of just a cleverly engineered tube.

@jeanpaulceulemans9973

4 ай бұрын

pulse jets expell more gas mass than it takes in because the burnt fuel components are also going through the tube unlike this construction which has external combustion. That said, I still think he's wrong and the asymmetry of omnidirectional intake versus directed expulsion generates the thrust This also applies to a closed pulse jet as part of its thrust generation imo

Never have even heard of pop pop boats. Amazing

Another possible reason for the oscillating motion moving the boat forward: the shape of the boat generates much more drag being pulled backwards than it does being pushed forward, so the net effect over a full cycle is in the positive direction.

@233kosta

Жыл бұрын

It's not really going fast enough for pressure drag to be significant, at that point it's mostly viscous drag which is symmetrical. Even if that wasn't the case, the boat would have to stop and reverse direction for the drag bias to have any effect at all, and it doesn't. It just keeps going.

@fireballxl-5748

Жыл бұрын

@@233kosta Disagree. Simply disagree and would have to see empirical evidence.

@233kosta

Жыл бұрын

@@fireballxl-5748 If you want "empirical" evidence, go run an experiment. I'm not paying for all that instrumentation just to prove a point to some rando on the internet who doesn't know what a Reynolds number is. Your choices are to either learn fluid dynamics and kinematics, or pay for an experiment everyone in the industry sees as a complete waste of effort. I suggest you start at Anderson's Fundamentals of Aerodynamics.

@fireballxl-5748

Жыл бұрын

@@233kosta What "experiment"? Suggestion? You're the self called expert.

@233kosta

Жыл бұрын

@@fireballxl-5748 You asked for empirical evidence, that is how you get empirical evidence.

You glossed over the flexing metal making a popping sound, but that compliance is actually another spring in the system. I believe this added spring sort of amplifies the steam effect which is what makes the metal boat faster than the glass one.

@DJZofPCB

Жыл бұрын

On the head of the nail.

@SebastianWoodard

Жыл бұрын

man I love KZread. you can learn so much stuff just by reading the comments

@SebastianWoodard

Жыл бұрын

but I assume because of the motion, it creates a bit of a vaccumn to assist th oscelation?

@DavidMartin-jr8nd

Жыл бұрын

I bet the glass boat is also much heavier. It might have worse fluid dynamics as well.

@altruismfirst6489

Жыл бұрын

It is a basic version of a Sterling engine with the metal acting as a piston . This flex is vital as is the cooling properties were and metal pop is a frequency with some other non audible frequencies that are yet to be observed in the overall propulsion total percentages. A glass version defeats many observations and in fact indoctrinates the real working aspects of the metal original. An infrared camera using a metal unit will be interesting.

I built one when I was a kid out of thin galanized steel and a coil of thin copper tube I got at a hobby store. Was really heavy but worked suprisingly well with a sterno can heating the coil.

Since childhood I have the pop pop boat but the only forward motion complexity cleared now after watching your great video ❤❤❤❤❤ thumbs up for the great explore with glasstube boat which is state of art 😀😀😀😀😀😀❤️❤️❤️

Very interesting & well made as usual

There is a very critical part you're missing. The resonance is controlled by the bulk modulus of the fluid. In a glass chamber, you purely have the bulk modulus of the gas in the chamber. The metal pop boat has a variable stiffness based on the size of the diaphram, which tunes the resonance to that of the heat input of the system.

@the-real-zpero

Жыл бұрын

Interesting 🤔 Explain it again, but pretend I'm 15 😁

@caseclosed9612

Жыл бұрын

I second ZPERO's motion for elaboration, but like a layman version please lol.

@unfa00

Жыл бұрын

What is a bulk modulus?

@hjertrudfiddlecock4394

Жыл бұрын

@@caseclosed9612 explain it to us like we're a slow cousin! please Fuddleton

@The_Rising_Dragon

Жыл бұрын

@@the-real-zpero So oonga bunga explanation is, that different material sound different when you hit them. Water if flow at certain speed, within certain vessel, it makes same vibration as material. Glass is not same material as plastic, so different shape required, or water need flow to be faster or slower! Capiche? EDIT: Also heat be important for good popping!

재밌게 상세한 설명 감사합니다.(62년생인데...어렸을때 마당에다 큰고무통에 물에띄어 신기해하며 놀랐던 추억이 생각나요)

I've always wondered (like since I was three) if one could make a person's size pop boat. In Hayao Miyazaki's "Ponyo" the little boy has a person size pop boat, my dad thought it was the cutest thing.

@zonesproductions

Жыл бұрын

It was the cutest thing 😄

@JimmyZeng

Жыл бұрын

To be precise he had a regular sized pop boat, Ponyo used her magic.

@joecool4656

Жыл бұрын

Oh you definitely could make a human sized version of this. It would work

@BierBart12

Жыл бұрын

Imagine having a nice wood campfire in a little metal stove under the tank

@DyersEve726

Жыл бұрын

@@BierBart12 roasting marshmallows while taking a boat ride. Brilliant, lol.

Thanks for explaining how it works. Would it be possible to put a piston in the tube to get it to spin a crank? It would push it both up and down

Fascinating. One thing that I didn't hear you mention was that water doesn't compress, air does. You can put pressure on water but not compress it like air can. So, the air on the suction cycle acts like a pillow.

Just a small note that the natural frequency of a system is not the same as the resonant frequency. They may be close, but they are not the same and can be calculated depending on the energy source driving.

@SteveMould

Жыл бұрын

Good point

@kain0m

Жыл бұрын

Also, the initial phase shift doesn't matter. If you have a energy supply coming in near the resonant frequency of the system, it will align it's phase _very_ quickly.

I feel like this explanation was lacking the usual rigor of explanations in previous videos, and it raised more questions than it answered: - What about a symmetrical boat with the same amount of water resistance forward as backward? - What if you pointed the tubes forwards? - What if the underwater portion of the tube had a T-junction with a one-way valve so that it would suck water in from the front and push water out the back?

@NareshSinghOctagon

Жыл бұрын

Time to hire more glass boat makers,eh?

@prophetsspaceengineering2913

Жыл бұрын

Agreed. I could definitely see asymmetric resistance being a significant factor. Hard to tell how much of the motion can be attributed to it.

@enaudeni

Жыл бұрын

Symmetry of the boat aids the forwards motion but to a minor degree, if the boat was square it would still move in the opposite direction of the tubes. It comes down to the characteristics of the suction vs expulsion of liquid from those tubes. On the suction of the liquid, it sucks water in from an omnidirectional area. Yet when it expels the water it is in a directional / concentrated stream, like when you squirt water from a syringe it is in a long directional stream. So the expulsion of the water has a greater directional force than the suction so will always move in one direction far more than the other.

@andrewfleenor7459

Жыл бұрын

I like the one way valve idea. Maybe a Tesla valve or two.

@dave7038

Жыл бұрын

Explanations like in the video are pointless without experimental proof clearly demonstrating in isolation a 'wrong' explanation failing while the 'right' explanation succeeds. Otherwise the explainer could equally well describe a mechanism involving magical fairies that just like it when the boat moves 'forward'. That's why the ball-chain fountain series was interesting and educational. This was half-assed (maybe because Steve wants some other KZreadrs to call him out on it so they can do some response videos that get more engagement, much like Derek's recent electricity video (which IMO was specifically designed to be 'wrong' in ways that generate responses (see his other videos on clickbait and experiments with video titles that maximize engagement) that generated a great deal of traffic and engagement across several channels, much more than if they just posted a single correct, well-researched video).

i had this when i was a small child here in India, i always thought it pulled water in from one tube and pushed it out of the other, great video!

A simple explanation by me🙃🙃🙃: it produces just back and forwards oscillations, and the main reason which pushes the boat forwards is ---> 1) the watter coming out of the end of both tubes goes straight direction i.e. 180⁰ angle only (becauseof momentumof water) , so it creates the much pressure which propells the boat forwards, but 2) while the contraction cycle the water gets sucked in but this water comes in not in straight direction, it comes from all direction of the both ends of the tubes , (in least resistant way) so the pullback force is less for 180⁰ angle as the force is diveded on other angles i.e. sideways. that difference between forward and backward pull forces makes boat to travel in forward direction. its like vacuum cleaner motor needs more energy to suck 1kg mass from a large distance. but blower motor consuming same energy can propell the same 1kg weight from same larger distance easily.

This was an interesting video for sure, one which I would never have believed had you not produced the glass model. From model engineer books I read as a child, some 55 years ago, I was led to believe that one tube was fixed into the cylinder at a slightly higher elevation, just a tiny amount and this in turn caused one tube to suck in water and the other to expel the water and vapour causing the forward momentum. So, I thank you for clarifying a miss held perception I have had for about 55 years or so. I am a marine engineer retired, yet I still held this belief to this day. Amazing really. Thank you for this video.

Theoretically, how large could you make a pop-pop boat and still have it work?

@DragonFiesta

Жыл бұрын

this is what I want to know aswell

@_Matchu

Жыл бұрын

as big as my p... house

@thomasbarlow4223

Жыл бұрын

Here come the new latest and greatest winter boats all over Wisconsin

@ChickenDeranged

Жыл бұрын

ha ha, the answer to this is in a movie called Ponyo... lol

@Aquanorte

Жыл бұрын

At least as big as titanic .. it had a similar working principle

The glass one is cool, but I also like the little flutter of the metal one on the top.

I'm watching this on a Sunday morning with a stinking cold, and it reminds me exactly of watching Open University as a kid, except now it's less dry and I more or less understand it! Thank you.

I still have my dad's pop pop boat from the 1950's. It was his toy as a child. And it still works very well. Nowadays, my two 5 year old boys are the ones that play with it.

9:41 It would be interesting to see this done with the tubes closed off by a flexible membrane, to preclude any possibility of water being sucked into the tubes any appreciable distance.

@charlieevergreen3514

Жыл бұрын

I’m wondering if dampening the oscillation would nullify the thrust. I’m guessing it would but I’m not certain.

@thebonedawg2808

Жыл бұрын

@@charlieevergreen3514 I'm not up on my physics but I think due to the inverse square law as soon as you close that thing the valve pressure would be so high It just blows back open, but at half pressure.

@greenaum

Жыл бұрын

Doesn't using red water demonstrate that? You can see that most of the water in the tubes remains the same water, once it's up and going. You can see that none of the water from the tank it's floating in gets in there.

@gaminawulfsdottir3253

Жыл бұрын

@@charlieevergreen3514 That's what I was curious about.

@gaminawulfsdottir3253

Жыл бұрын

@@greenaum No, I really can't tell from the dye whether outside water is diluting it, or if so, how much. Mainly I'm interested in how much of the motive force is generated by allowing water into and out of the pipes, or whether it's more of a vibratory function that can just as easily be performed by a membrane.

Great Explanation sir. Glad to learn the working of this toy. 🎉🎉

Thank You. You explained that very well. I like to learn new things every day!

This reminds me of Feynman’s thought experiment of what would happen to the motion of the arms of one of those rotating (“helicopter”) sprinklers if it were placed underwater and sucked water in instead of expelling it out. Would it rotate in the same direction as the expulsion case, the opposite direction, or not at all?

@hollt693

Жыл бұрын

I wouldn't think the spring loaded diverter arm that drives the rotation would move much (if at all) if water was being sucked into the spray aperture, but I can't say that I have anything more than intuition to base that on. Am I close?

@charlieangkor8649

Жыл бұрын

It could also sometimes rotate this way sometimes that way or not at all. If we do a similar experiment - drain a sink and ask "will the water rotate or not and which way?", it may rotate every time a different way or not at all.

@samroyston7281

Жыл бұрын

@@charlieangkor8649 that's the opposite of a scientific answer, congratulations. Feynman's ghost is probably doing backflips and it's not even true, water drains in a remarkablely consistent direction based on your hemisphere, an observation that has helped us deduce things about gravity and fluid dynamics. If we had just said "sometimes it does one thing and sometimes it does another", we havent observed anything, we've ignored reality

@Mister_Brown

Жыл бұрын

not at all by my account for two reasons, one the force of the water coming in at a right angle hitting the back of the tube would cancel the suction "force" (i know, i know) but the main reason is those sprinklers use hydrodynamic bearings that float on a film of water provided by the hose pressure and seize up if you don't have pressure pushing up on the arms, even worse in suction

@bobafettjr85

Жыл бұрын

@@hollt693 I think you're thinking of a different type of sprinkler. The helicopter type doesn't have a spring.

There is a similar "cancellation" effect during expulsion phase as well as during the "suction" phase. At the final point of the expulsion phase, there is negative pressure difference in the chamber, that will later suck the water in the tube. While negative pressure difference holds in the chamber, the vapor/air inside it "sucks" boat backwards (or in other words, stronger atmospheric pressure pushes the boat backwards). So, the given explanation of the boat propulsion is not complete.

@tau9632

Жыл бұрын

Came to the comments to say exactly this!

@johnineson

Жыл бұрын

My gut feeling was that that explanation was wrong. For me, a more logical explanation for forward motion is the asymmetrical hydrodynamics of the boat. Going forwards, you're pushing the streamlined prow through the water, whereas backwards is is trying to force the flat stern against it. Even with exactly equal forwards and backwards impulses, I would expect net forward motion. The toothbrush is a good analogue. The bristles are sloped backwards, making the friction asymmetrical. Push backwards and they will tend to grip; forwards they will tend to glide.

@hanvyj2

Жыл бұрын

@@johnineson a good test of that theory would be to have the tube exit the front of the boat. It should still go "forwards" if that was the case, and it was the hydrodynamics, whereas it would reverse the direction of the video exposition is correct.

@enderyu

Жыл бұрын

Of course there is no total cancelation! The water being spat out will inevitably mix with the surroundings. Its not like it is sucking in the same water it just ejected out

@ewicky

Жыл бұрын

I also came to the comments to see if anyone else was totally thrown off by his explanation of "only a cancellation in one of the two phases of the cycle". Like, huh?!?

A mechanic you failed to mention about the metal pop pop boat is the top piece of metal in the chamber pops in and out just a little bit. This assists the positive and negative flows of the water. That's one of the reasons the metal one moved faster. Weight is likely a factor as well I'm sure.

@_..-.._..-.._

9 ай бұрын

He mentioned that, maybe not that throughly, but it was said.

I did not know these things existed! :) Thank you for explaining why it doesn't just oscillate in place! It makes good enough sense! :)

I think you missed something… the shape of the boat. I would like to see the test done with a rectangular boat to see if the lack of a bow makes a difference.

@SteveMould

Жыл бұрын

I cut that from the video actually! I wasn't sure if it would interest everyone. But yeah, I think it probably enhances the effect.

@matthewbarrowcliffe1091

Жыл бұрын

@@SteveMould my curiosity is about whether or not the pipe exiting the bow would allow the effect to be reversed, perhaps not efficiently. I may build myself a couple to experiment.

@JCisHere778

Жыл бұрын

I don't think the shape of the boat will have that much of an effect. Most energy will probably not be dissipated through friction but through the surface waves

@WJS774

Жыл бұрын

@@SteveMould Cutting that was probably a mistake, I swear like half the comments here are some variation of "you're wrong, it's actually the shape of the boat".

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@Richardson238

Жыл бұрын

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Жыл бұрын

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@betheluktu7647

Жыл бұрын

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@philip1258

Жыл бұрын

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@Richardson238

Жыл бұрын

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The shape of the boat will influence it's motion as well. For a typical V shaped haul, it's much easier to push the boat forward, as apposed to reverse.

Ah I love these. My dad had some vintage ones from his childhood we got to play around with when I was a kid.

I bet the shape of the boat helps too. Since there’s more drag when the boat is accelerated backwards, it will have a slight preference to move forwards with the periodic motion from the tubes. Could be worth building a setup where the tubes are mounted in reverse to see if the drag being different is dominant over the argument you made for the collision between water and air. Great Job on the video! Edit: I said it was the first video I’ve seen on this channel. Turns out that was a lie. You got a new sub today

@quartercast

Жыл бұрын

I agree. Movement is due to the streamlined shape of the boat. Same as the biased shape of the toothbrush bristles leading to forward motion of the bristlebot. I'm also not convinced with his first argument that jetting does not have an effect, I believe it would have an effect, regardless of conservation of mass in the reciprocating volume of water.

@Dino14345

Жыл бұрын

If you move side to side on a small sailboat, you will go forward

This is really cool! I just rewatched Ponyo and, towards the end, the main character's little boat (which I now is a poppop boat lol) gets made big enough for him to ride as a method transport. So I wonder how big a poppop boat could actually be 😂

@sethkeown5965

Жыл бұрын

i didnt and havent wanted to watch ponyo. can you sell me to watch it?

@SovietMarmalade

Жыл бұрын

@@sethkeown5965 what??

@sethkeown5965

Жыл бұрын

@@SovietMarmalade ive bot seen ponyo, i want to hear a sells pitch that will get me to watch it.

@a1esandra

Жыл бұрын

@@sethkeown5965 underwater town fantasy and the satisfaction of seeing a working Lifesize toy boat :3

@a1esandra

Жыл бұрын

Right I've never seen this toy before but when it showed in ponyo I was so fascinated I'm so glad this video conveniently showed up on my feed

As a child, this tinplate toy was a must have every year during my annual vacation to Varanasi, India. I still have a few left, preserved somewhere within my chattel. Thank you for posting this video.

I had a little boat of this type, at the beginning of the 60s. It was made of a tin and with a cotton ball and alcohol, it sailed through the waters of the bathtub. Very clever toy.

Love the "transparent version" of everything. Understood engine working from transparent engine from SmarterEveryDay channel. It's make me understand concept, always knew how engine works but never felt from inside. This is also very beautiful.

The water pushed out is a jet that mostly goes straight backwards and propels the boat forwards. The water being sucked in comes mostly from a hemisphere (or more) around the end of the pipe, i.e. multiple directions, having much less effect on the movement of the boat.

In my teaching days we use to make these with the kids but the 'engine' was just a length of copper brake tube formed into a coil for the boiler with the ends soldered into the back of the tin boat. Without the flexible tin on top of the boiler they didn't pop so audibly but still worked. Also we didn't fill the tubes with water, just tilted the hull slightly so one exhaust was under water and the other not so a few drops of water entered one end, that was enough to set them off.

I love how they reused a tin can to make the hull. Clever recycling. The glass boiler made of chemistry test tube didn't do it justice, since glass is a good insulator. It brought back memories from when I was 6-7

I never heard of scientific glass blowing team, that sounds like the strangest hobby ever, but the really made something pretty

@explosiverift2037

Жыл бұрын

Labs have them sometimes.

@DocBree13

Жыл бұрын

It’s also a career, for some

@johnmf6096

Жыл бұрын

My BIL is a scientific glassblower by trade and it IS in fact a career.

@AG-pm3tc

Жыл бұрын

@@johnmf6096 can you tell us a bit more? what use cases employ your ability? how you got into it?

@5naxalotl

Жыл бұрын

lab glassware is traditionally hugely expensive and large universities often have a glass blower who can do repairs, when it's not an item that can be mass manufactured in china there are a whole bunch of youtube videos of lab glass blowing. it's exactly as amazing as you'd think it is so you really should check them out

Great video. I used to play with them in my childhood and I was pretty intrigued how it worked. Thanks to you now I know. Might get a couple of pop pop boats to play with too 🤪 I also watched your entire advertisement of Anker.

Magnífic explanation. Thanks for your work.

Intresting video ! I used to play with this boat in my childhood during rainny day's.

I remember when me and my dad would make these out of old soda cans. We would have to buy pre-made tubes and tanks but it was still fun. He said that these were a very common toy in India and other places in Asia

@ApoorvPadhye

11 ай бұрын

This video unlocked a core memory for me as a child. I remember my dad bringing such boats from a regional fair nearby the city and showing me how it works. I wasn't allowed to touch it as I was very small and the boat used to be hot from recent usage. They went away as I grew up and I subsequently forgot about them until now.

0:14 "this channel is becoming a transparent version of things" lol 🤣🤣🤣😂😂😂

Fluid-dynamics is always so interesting.

I remember my parent give this at my childhood Btw in indonesia we call it "kapal otok-otok"

@irchonite1953

Жыл бұрын

that's so cool! :)

Really interesting - Thanks Steve. I remember playing with these with my grandpa as a little kid in the park beside their house! I think he did explain to me at the time how it worked, but all I'd ever remembered was that it was a bit similar to a Sterling Engine, so nice to see a clear model in action.

When i saw this I had to watch it. Ponyo! Thanks for explaining how it worked. I honestly didn't even know it was a real thing!

I remember seeing this toy in the movie Ponyo and I always wondered how it worked.

The first explanation is somewhat correct. After the first exhaust phase, water is sent backwards while the boat is propelled forwards, conserving momentum. When the boat draws in water a second time, it doesn't come from water used back in the first cycle, but local water ahead of the first cycle. In this sense, it's like climbing a ladder.

@blackmber

Жыл бұрын

Ooh nice analogy.

@megamaser

Жыл бұрын

Bingo

@emersonpage5384

Жыл бұрын

that's interesting, because if true it would mean if he continued running the experiment with colored water inside the tubes, eventually the tubes would be filled with only clear water.

@DaP84

Жыл бұрын

It should cancel out the energy/momentum regardless? When you push on something there is an equal and opposite force acting on you = how the boat starts moving. The same, but opposite physics phenomena should happen when the boat pulls water back into the pipe, regardless of which water it sucks in. So why doesn't these two opposite forces cancel out each other? So the analogy of climbing a ladder with your claim of "intake of local water" goes against basic physics. Must be some other factor that does it

@1.4142

Жыл бұрын

@@DaP84 The key to the answer is the center of mass of the boat-water system. After the first cycle, if the boat were to draw back in the water expelled from the first propulsion, it would go back to its initial position. But by using local water ahead of the first, the center of mass of the boat-water system has moved forward.

It’s cool how sound & like literal energy from heat can create their own frequencies

We used to make these before they became easy to buy. We just got a length of copper tube and put a single horizontal coil in it. To run, the candle had to be under part of the loop not in the centre of the whole loop. 1 loop was fine, more did not make it go faster.

Thank you for the transparent view. I found it to be very helpful in explaining the oscillation of the liquid and how far the liquid actually travels back toward the tank. (As others have mentioned, the dye was also very helpful!)

When I watched Ponyo last year, I has a slightly different theory on how those work so it's nice to have it all laid out like this

@codegeek98

Жыл бұрын

🤔 I don't remember those I will take this excuse to rewatch it

Collision and momentum. Fascinating!

Have you tried making the shape of the boat same in both the front and rear? The drag in the forward motion is much smaller in the usual shape.

Man, these are giving me visions of full scale, and even giant vehicles operating with these kinds of propulsion systems, perhaps in the style of those in classic Ghibli films. Imagine hopping on the pop-pop boat to be ferried across the channel to the opposite coast, at the edge of the desert where you catch a ride on a bristle bot for the trip to the oasis in the center

@clownsabound

Жыл бұрын

there actually was a life sized pop-pop boat in a ghibli film called ponyo! its the reason why i clicked on this video funnily enough 😅

@coloradolove7957

Жыл бұрын

Let's keep working on this....

@ennoshita7495

Жыл бұрын

@@clownsabound same :)

Very interesting & well made as usual! I don't quite accept the "collision" on the intake being that important of a factor for moving forward (and having no "anti-collision" on the output.) Just like the oscillating syringe example, the pressure and vacuum forces both slow and stop the motion, then reverse it, with seemingly equal force.

@tau9632

Жыл бұрын

Exactly!

@enderyu

Жыл бұрын

Why would you assume equal forces? You are grabing mostly still water around the boat and throwing it backwards creating net thrust. The ejected water will inevitably mix with the surroundings, and the still water around it will present less resistance and thus will end up being sucked into the boat, instead of somehow being ignored and forcing the boat to suck the same water it just spat out

@maxwang956

Жыл бұрын

"Just like the oscillating syringe example, the pressure and vacuum forces both slow and stop the motion, then reverse it, with seemingly equal force." You're missing one thing: when the vacuum forces stop/slow the outward motion, there is less water in the tubes than during the reverse motion, because some of the water was pushed out!

I really like these type of engines without moving parts. This one reminds me of the pulse engine of the v1

@joefish6091

Жыл бұрын

Pulse jets need flap valves to allow air in, then they are force closed from pressure from the fuel detonation, forming a reaction rocket chamber.

0:15 thanks for your transparency.

I knew it. I’m so glad you’re doing this video rn dude. These were one of my favorite toys to play with. And the movie ponyo really made me love them

I think the reason the boat moves forward and not back and forth has a much easier explanation. I think it's because of the shape of the boat, pointy in the front and flat at the back, making it have much less drag going forward than backwards.

@umblapag

Жыл бұрын

Came down here for this

@enderyu

Жыл бұрын

That is not correct. Steve even said in a comment he tested it with a symetrical boat (which worked) but didnt think it would be too relevant. It works because you are not just pushing the same body of water in and out of the boat; the ejected water mixes with the surroundings and still water around the boat ends up sucked in. Essentially taking still water around and throwing it backwards.

This brings a lot of memories. I want to buy one in the future...maybe

Alright. Now let’s see you build a life size one you can ride inside!

Ah I remember watching ponyo as a little kid, and up until now I thought that maybe the boat they used existed to some extent, but I never thought it would be exactly as theovie portrayed it, very nice!

@SurajGrewal

Жыл бұрын

With? You never had one as a kid?

@rickus7843

Жыл бұрын

Ponyo!! Was my first thought!

I used to make bristle bots all the time as a kid and something that is really important is that the bristles are all angled in the same direction. That ensures that it is depressed forward when it vibrates before the bristles spring back to their original position with the brush slightly moved from where it was before

Also something as simple as the shape of the boat where the front allows for less water resistance vs the back of the boat would contribute to the impulse (change in momentum) to forward motion, even in the hypothetical condition that the forces cancelled each other out

I wonder how a large scale version would behave in the sea. Massive oscillation plus noise should make for a nice trip to the Maldives.

@JustRememberWhoYoureWorkingFor

Жыл бұрын

It would be very inefficient

I had actually wondered how these worked since watching Ponyo. Thank you for answering that question.

This was and still is my favourite toy! I always wondered why they don't use this kind of tech to power actual boats. Effeciency, perhaps? I would love to see some madlad making a huge boat which uses spent nuclear fuel to push boats around. Popping sound optional. Or something similarly bonkers yet fun.

@raghubharadwaj7122

Жыл бұрын

spent nuclear fuel on regular boats 😂 noice

@Nineninetails

Жыл бұрын

I was right there with you until you said spent nuclear fuel. The spent rods dont put out much to any heat. That is why they are considered spent even though they are still radioactive.

@aquafyre99

Жыл бұрын

This exact concept was mentioned very briefly in the Harry Harrison Stainless Steel Rat sci-fi series. Not spent fuel, but a small nuclear source, as a simple, reliable backwoods boat engine.

@AabhasLall

Жыл бұрын

@@Nineninetails Ah, interesting. I just knew that spent rods are to be placed in cooling ponds for 5-8 years. But nuclear powered popping boats sound nice, both conceptually and literally! :D

@radadadadee

Жыл бұрын

Not sure how you can you stop the boat with nuclear rods

That toy was my childhood memory. I had this. Sweet memories ❤

Awesome glass job. Surface area must count for a lot in the tank as well.