brilliant.org/d4a/ Pulsejet engine ready to run: www.enginediy.com/products/pulse-jet-engine-medium-valve-controlled-gasoline-internal-combustion-model-airplane-model-engine?ref=d4a Support the channel by shopping through this link: amzn.to/3RIqU0u Patreon: www.patreon.com/d4a Become a member: ruclips.net/channel/UCwosUnVH6AINmxtqkNJ3Fbgjoin Grit: ruclips.net/channel/UCt3YSIPcvJsYbwGCDLNiIKA
How will the engine be influenced if one place a perforated tube inside the intake or the combustion chamber itself? This perforated pipe could positioned on the inner surface of the outer tube, but also with a space between it. Thus creating a hollow space like a cars exhaust silencer. Speaking about silencers: can one be installed in front of the in-/ but also the out/exhaust pipe? - How will all this influence the engine?
@@theblackhand6485 🔴 What Is Islam? 🔴 Islam is not just another religion. 🔵 It is the same message preached by Moses, Jesus and Abraham. 🔴 Islam literally means ‘submission to God’ and it teaches us to have a direct relationship with God. 🔵 It reminds us that since God created us, no one should be worshipped except God alone. 🔴 It also teaches that God is nothing like a human being or like anything that we can imagine. 🌍 The concept of God is summarized in the Quran as: 📖 { “Say, He is God, the One. God, the Absolute. He does not give birth, nor was He born, and there is nothing like Him.”} (Quran 112:1-4) 📚 🔴 Becoming a Muslim is not turning your back to Jesus. 🔵 Rather it’s going back to the original teachings of Jesus and obeying him.
18.20 Would cooling fins (cast or wielded) on the pipe downstream of the expansion chamber improve thermodynamic breathing? The pipe will be cooler as combution heat radiates away and increase the difference in temperature between the gas and the metal. It would affect the temperature of the exhaust gas returning to the combustion chamber, but that could be adjusted for in changing pipe diameter or length.
@@godassasin8097 You could just grind a nail on a rock or find the right rock to make a small knife out of. Making the jar seems to be the hardest task.
I've considered this as well. I think his purposeful periodical pauses to review and summarize the concepts he's just explained is key. I'm trying to learn and adopt some of his style to use on my own session's with colleagues and audience.
he isn't....that jar isn't a pulse jet....AND it has 1 moving part. It's a pop pop, or pump "engine". In other words, clickbait. His vane engine had recipricating parts as well....the vanes. This is well known. I suspect he knows this as well, but shines it in favor of clickbait. Unless he actually doesn't know.
Quick animation tip: You can interpolate between key frames without artefacts by smoothing out just particles on separate layer, them composing everything together. It can be done by drawing primitive shapes and moving them between key frames. No smearing, no AI. "Krita has animation tweens apparently (Animation curves tutorial)" Other than that I'm glad to see you are continuing to learn and teach us about even more engine types and keeping the style consistent ! These 2D diagrams and bold text are (together with your explanations) an important part of what makes everything so easy to understand.
@@msromike123 At 4:47 the engine outlines are trying to morph and move together with the fuel. It looks almost trippy, to the point where I was wondering if it was possibly intentional or is it just a glitch. Later on the transitions change to simple fade and look very good. My intention was not to look for a problem or criticise. Honestly I'm surprised I got so many likes and any responses. The animation is good and it never bothered me before. Simple drawings and showing each state for longer, like freeze frames in cartoons makes everything more clear and easier to understand. This is exactly why I like watching D4A videos and why sometimes fancy 3D graphics with thousands of particles isn't better - visual clutter takes more "brainpower" to process and distracts us from the actual important principles, especially with many things happening at once. I just wanted to post a... quick tip. So that If he ever wants to experiment with complex movements or morphing - it's there.
I was NOT going to watch this...until I saw that "Driving 4 Answers" made it. I am never disappointed by your D4A videos. Please keep up your creative ways to spread Engineering knowledge. It is tremendously appreciated.
My father bought me a hobby RAM Pulsejet and we used to run it on 30% Nitromethol airplane fuel. I cant tell you how many times I burned myself or how much hearing I lost while playing with it. That thing used to glow orange and red, it got so hot and it was obscenely loud but it worked pretty well. I mounted it to an rc street car and was fairly fast . Ram pulsejets are a lot of fun and they teach you some really neat science. Great video!!!!
I love watching your channel grow. When I started you were only at a 150k subscribers. Your quality and integrity hasn't changed since day one and I really appreciate it. Keep up the good work. 🎉
The V1 engine was actually quite a bit more complicated in that it had an array of reed valves ahead of the combustion chamber and also benefited from a ram air effect, allowing it to achieve a higher effective compression ratio and better fuel efficiency for extended range.
For the time being and the cost it was rather efficient. It would be hard to design a cheaper way to propel a flying bomb that distance. So if some of them took a nosedive on the way that was still a win in for the Nazi. No pilot and no plane risked, just a little fule and some explosives. But as effective tas they were these were slow. For a jet engine it's not very high performance, and British fighters were able to keep pace with then without problem. So they shot a lot of them out of the sky, and some even tipped them over using the wingtip to flip the V1 over. This tripped up the gyroscopic device steering the thing and it turned back and dropped into the sea when out of fuel. The V1 was a real terror weapon. They were cheap enough to manufacture that the Germans could send a lot of them. They had very bad precision compared to what we see today, but at the time it was just a fantastic idea that they could send them that far and have them hit somewhere in the UK. And that simple engine was what made it possible. And yes, the use of reed valves and ram scooping of air made it a bit more efficient than the puls jet engines discussed in this video. If I remember correctly they also had a constant use of a spark plug to start the combustion and didn't rely on the return of the hot exhaust of the previous combustion. So add a battery and ignition solution to the load.
Insane they went through all those engineering hurdles just to stick them on a cruise missile that would either explode or miss its target. I suppose they didn't have many other options.
So the way the engine works is kinda like what happens when you pour a very full box of milk: instead of coming out smoothly, the milk flow is fluctuating and creating pulsations. In this case, it’s because after part of the milk is poured out, a partial vacuum is being formed in the box, and air needs to get in first before more milk can be poured out, just like in the impulse jet engine, except instead of milk, we have hot exhaust gases. Very interesting design!
I used to watch Colin Furze play with pulse jets years ago and thought I had a fair knowledge of how they worked. Now I do. Yet again another excellent video. Yet again thank you for sharing your knowledge in an easy way for the masses to understand. 👌🏼
LOL "Let's vacuum up the alu particles, we don't want to make a mess of this nice tablecloth" 1 minute later "Half of the table and cloth are incinerated"
Amazingly well explained. I didn't understand how pulsejets work for years despite trying to get into the topic. You have explained it so well that it finally clicked! Thank you, you are a great eductator!
I love how educational your channel is, man. I'm a highschool dropout, come mechanic and I can't help but wonder how different life would be if I followed through with this. You make it sound so simple!
I spent 10 years in the car business almost immediately after I graduated (which was just barely) I left and became an electrician. I still wrench, but mostly for fun these days. It's never too late to change lanes man, or directions entirely.
I know some people that had worked on Pulsjet RC planes - the results are some really nice looking Messerschmitt and fantasy aircrafts (the smallest of their engines fits inside your palm). And since a few years they have now tried getting a puls-detonation engine going. larger prototypes "work" but are a pain to work with and not reliable yet. Would really love to see them manage to get them working. There are a few more disadvantages than mentioned: The thrust is intermittent at the engine-frequency - meaning it imparts massive vibrations that need to be dampened right at the source. Thrust-control is poorly understood and most attempts rely on a combination of limiting fuel supply and air intake.
Your ability to explain physics and mechanics never stops to amaze, this is the first explanation of a pulse jet which really gets me understanding what happens inside that tube.
I have to congratulate you for the exciting diversity in your selection of subjects. Thank you for pointing out stuff we take for granted but =have a fascinating background with is hidden from the average on-looker.
Lennox built, marketed, and sold the Lennox Pulse warm air furnace for many years. They had some weld issues early on but after that is was a great, albiet loud, furnace used for residential homes. Also after the early models they started using mufflers on the intake and exhaust to quiet them down some. Lennox added moving parts to their design. There was a small inducer/purge fan to clear the chamber and start the flow. Has a lawn mower style spark plug to ignite the mixture initially with a flame sensor to stop the spark and inducer fan. The intake and the gas valve both have a "flapper" valve to prevent gasses from flowing backwards. The main exchange is cast iron and the flue pipe and secondary exchange are stainless steel. There is a pressure switch to verify flow and detect a backup of condensate if the trap becomes plugged. After a normal heating cycle it is very common for the air circulation blower to come on a second, and even occasionally a third, time because the cast iron exchange would heat the air that much while cooling down. The purge fan comes on after the heating cycle to clear the exchage. It is to this day the only furnace I have tested and had a reading of 0 PPM CO at the exhaust. The first time that happened I thought the machine was broken but it ended up being fairly common to have very low or a 0 reading. It was ahead of the times and will likely be a never again furnace. One of the coolest furnaces ever made IMO.
I remember building one of these when I was a kid using plans from the back of a popsci magazine that cost $12 + $2.99 shipping and handling. Since this was back in the 80s I didn't have anything other than the plans for guidance. It was a design that used reed valves and because of my limited budget and skill as a kid, I found that to be the most difficult part because all I had to work with was old tin snips...and the reeds needed to be flat. I used a hammer and a scrap piece of steel i-beam to flatten them as best as I could. I was able to get it to start and run for about a minute before my mom told me to never do that again or someone will call the cops. Probably accurate as I did live in a city at that time. It did not explode though, which was a possibility in my mind, coupled with the fact that I was using gasoline as the fuel. I think that u-tube design is good but you may be able to improve the function of a pulse jet by using reeds, and rather than using reeds you could use a rotor with a weighted outer ring. My idea here is that as part of the start-up process you use a portable starter motor or compressed air to spin up the rotors, which have the weighted outer rim to act as a sort of fly wheel. Once they are up to speed they will provide a mostly steady air flow and positive pressure, possibly even boost, and the pulse jet exhaust would keep them spinning. Sort of a turbo effect, allowing you to burn more fuel more efficiently, thereby boosting thrust.
0:24 My German heart stopped for a moment, but then I remembered that you are East-European and probably do dangerous things like this all the time and are a trained professional.
@@Ammoniummetavanadate If he was German he would have used a Ständerbohrmaschine instead of an Akkumulatorenschrauber and not hold the jar in his hand, but secure it on a Maschinenschraubstock, to minimize the risk of getting injured. And also he would pronounce Porsche the correct way.
And this is why I love this channel. This is something that I could actually build. Although I most likely never will because it would never turn out right. But the fact that I know how to do it is just amazing to me 😊
I just found your channel (it appeared on the outro links on the Plasma Channel - another great watch). I knew the basics of the pulsejet, having watched many of Crazy Rocketman and others, but never decided to learn the full concept, usually because it was too dry and boring. You, sir, make it fun and entertaining. I mean, who wouldn't want to see an engine made form a jam jar?!! That was a great hook! Then the rest was interesting enough, especially with your way of narrating it...excitement, stressing etc...more than enough to keep one entertained and following along! Well done, well put together, and well received! And now we really know how a pulsejet engine works 🙂 SUBSCRIBED!!
Some of us are legitimately learning so much from this channel! When the acoustic section came up, I thought, "Oh, that's just like a two stroke," right before he said it! I only knew that that from another video here, I'm not sure how long ago. Keep up the amazing work!!
Nice to see a real genius for a chance. He is pedagogical top one in the world. You simply cannot stop watching him because there is so overwhelmingly strong stream of information pouring in without the usual load to fight the gaps.
Thank you very much for this. When I was a kid, I used to fly control line planes. I was always fascinated by control line pulse jet planes. Yes, you are absolutely correct, pulse jets are incredibly loud. Have a really lovely day.
I really apreciate putting the script in the description, I scroll RUclips even without audio sometimes and reading was nice. Did get to watch the whole video at home tho
Excellent! You are really good at what you do. I never knew how complex the process is until now. The German "buzz bomb" was pretty advanced technology, but cheap to build and fly.
What a coincidence, I've been thinking about these every day for the last week, I've watched just about every single one of the videos he showed here of pulse jets running, and now he uploads a video about them, how lucky I am!
An excellent scientific explanation and description of how a pulsejet engine works. Thanks for making it understandable by defining the technical words clearly along with diagrams showing how each word applies and what it actually does. It is also well arranged by sequential explanations, so as not to confuse one part with the others. Few people have the ability to make a process so easy to understand! You sir are one of those few. Thank you!
I posted a video tutorial on how to make this and different possible fuel options! Didn't go into detail about the physics and mechanics because I didn't think people would be interested but looking at these comments I'm glad that the interest in science is there! :D
Great video and concise explanation, as always! You can see just how many attempts it took to start the glass gar engine, with what it did to the table top) "Safe drilling noises" in CC hopefully means gloves were used at least once ;)
I think this might be the first time I've seen the actual title of a video appear only in the thumbnail, with the subtitle occupying the "title" space...actually pretty effective! I don't hate it 🥰
What do you think about the following idea: This innovative internal combustion engine design centers around a spherical combustion chamber, augmented by a Laval nozzle and a rotary vane mechanism, all working in concert with a turbocharger and a valving system. The process begins with air being drawn in and compressed by a turbocharger. This compressed air is then directed through an intake valve into the spherical combustion chamber. Fuel is injected directly into the chamber, creating a pressurized fuel-air mixture. Upon ignition, the expanding hot gases are channeled through a Laval nozzle. This nozzle accelerates the gas flow to supersonic speeds, converting thermal energy into kinetic energy, and simultaneously lowering the gas temperature through adiabatic expansion. The high-velocity, cooled gas exiting the nozzle then enters the rotary vane section. Here, the kinetic energy of the gas is transferred to a rotor, generating rotational power.[1] Finally, spent gases are expelled from the engine through an exhaust valve.[2] These exhaust gases drive the turbine of the turbocharger, recovering energy and further increasing overall efficiency.[1] The spherical design of the combustion chamber promotes uniform and complete combustion. The inclusion of the turbocharger maximizes power output by increasing the density of the intake gases, while the valves precisely regulate the flow of both the intake mixture and exhaust gases, optimizing engine timing and performance. The Laval nozzle's dual function of accelerating the gas and reducing its temperature contributes to both improved power output and reduced wear on the rotary vane mechanism.
I do not have the efficiency of communication to express how grateful I am for the understanding you share. Saying Thank you feels like trading a stick of gum for a freezer full of steak.
There are engines out there that are way simpler than a pulse jet. Ramjets work in a very similar to normal turbo-jet engines, only they use intake ram air pressure instead of a compressor, eliminating the need for a compressor and turbine. Literally all that is left is a combustion chamber. That is it, there is nothing more to these engines. As they rely only on ram air pressure, they only work at extremly high airspeeds, but that is besides the point. If you want an even simpler engine, then there are always monopropellant rocket engines, which also have no moving parts beside the fuel pump and do not even require a spark.
Another excellent video. I had a basic understanding of pulse jets before, but as usual you add a lot of depth. I really enjoyed your video on 2 stroke pipes as well.
I had wondered how those things worked. I understood the V1 valved pulse jet, but how a shaped curved pipe did it was mysterious. Thanks for cutting through the mystery.
When I was a kid I read a description of how a pulse jet engine works (some WWII book or the like). I didn't really get it, it was just word salad to me. Ever since then I just assumed that it was all a bunch of physics and left it at that. With this video I feel that I completely understand the principles of how this device works. Enough so that I can pass the knowledge on to the next generation. That alone was worth the sub to your channel that I did a couple of years ago.
The original use of expansion chamber on a two stroke engine was pioneered by Walter Kaden who was working for the East German company MZ. He had been involved in the development of the Vi during WW2. The MZ dominated the small cc GP racing in the early sixty's. The factory rider for MZ defected to the west and later worked with Suzuki to develop there winning engines.
I always used an Aquavelva, Lectric Shave, or some similar after shave or cologne bottle because there is a narrow hole in the neck which condenses the exhaust like a rocket nozzle. The alcohol based vapors make an excellent fuel as well. Those things really look cool at night when you ignite them in the dark.
I wish you were a tutor at the technical college I attended.....lessons would have been much more interesting and understandable. Many Thanks for your efforts in making these vids for us.
as ever, yet another superb explanation of a challenging subject. I remember hearing stories from my grand parents generation about the horrible noise that came from the Doodlebug (V-1 flying bomb) as the flew over England in WW2, something many of them were haunted by for the rest of their lives.
Anyone seen the Big bigger biggest documentary aircraft episode with the scientist explaining the jet engine whilst holding a plastic water dispenser bottle and saying "THIS, IS A JET ENGINE". I always burst out laughing that phrase lives in my brain rent free😂
Hey! I am a huge fan of your channel. I love your method of clear, accurate, and simplistically effective explanations. They really help breakdown and allow people to understand the basics of complicated processes in engines, the engineering behind them, automotive and aerospace alike. Please do a video on detonation engines. Pulse Detonation Engines, (PDE), and Rotating Detonation Engines (RDE). Pulse detonation engines are almost like glorified pulse jets and are a very fascinating topic to me. P.S. -Another video topic idea that would be sooo cool would be- compressor surge/compressor stall in jet engines, I've found that the principles behind it are essentially the same as turbo flutter in turbo cars. (There are a couple videos of jets with compressor stalls/surges on youtube, they're hard to find but they sound just like turbo flutter except much bigger and louder.) If you read this, please let me know what you think!
This is a triumph of explanation. A team I was in as an undergraduate built a steam pulse jet, which just about worked. I had little understanding of the acoustics, though. I'd really value a frame by frame step through showing the three elements happening at once. Has anyone installed speakers in a conventional exhaust in an attempt to tune the engine?
Interestingly, I inadvertently made one by trying to burn out the carbon/soot from the exhaust pipe off of my old KTM 250EXC and a map gas torch. It had practically no thrust, but the noise certainly startled me at the time.
Great video as always! When you listed the Cons, I was expecting you to say something about lack of speed/throttle control. A given pulsejet will always pulse at the same frequency, I suspect, and have more or less constant thrust.
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"No, that's a spoon!"
How will the engine be influenced if one place a perforated tube inside the intake or the combustion chamber itself? This perforated pipe could positioned on the inner surface of the outer tube, but also with a space between it. Thus creating a hollow space like a cars exhaust silencer.
Speaking about silencers: can one be installed in front of the in-/ but also the out/exhaust pipe?
- How will all this influence the engine?
@@theblackhand6485 🔴 What Is Islam?
🔴 Islam is not just another religion.
🔵 It is the same message preached by Moses, Jesus and Abraham.
🔴 Islam literally means ‘submission to God’ and it teaches us to have a direct relationship with God.
🔵 It reminds us that since God created us, no one should be worshipped except God alone.
🔴 It also teaches that God is nothing like a human being or like anything that we can imagine.
🌍 The concept of God is summarized in the Quran as:
📖 { “Say, He is God, the One. God, the Absolute. He does not give birth, nor was He born, and there is nothing like Him.”} (Quran 112:1-4) 📚
🔴 Becoming a Muslim is not turning your back to Jesus.
🔵 Rather it’s going back to the original teachings of Jesus and obeying him.
18.20 Would cooling fins (cast or wielded) on the pipe downstream of the expansion chamber improve thermodynamic breathing? The pipe will be cooler as combution heat radiates away and increase the difference in temperature between the gas and the metal. It would affect the temperature of the exhaust gas returning to the combustion chamber, but that could be adjusted for in changing pipe diameter or length.
You were the moving part, you created a vortex by spinning it around. Try it without touching it.
It can take a engineer to make an engine out of a jam jar, but I wouldn't trust an engineer to make a decent jar of jam.
edited but still grammatical mistake 😔
Got it, explosive ok, jam bad.
Mate. If you think you need to be an engineer to drill a hole in a lid and fill it with a flammable liquid you need to go back to school
@@FBCxUNKNOWN i can't make that drill
@@godassasin8097 You could just grind a nail on a rock or find the right rock to make a small knife out of. Making the jar seems to be the hardest task.
00:34 I laughed OUT LOUD! 😅
Dust Buster CLOSED CAPTION: "Kia 1.6 GDI Engine sound"!
A little comedy is GREAT!'' More! More!!''(applause)
Yeah, taking the time for this +1000000 points 😂
…I think I might have that in my car 🤔
Mine said "FAYA!"
Yes, brilliant i laughted also 😂😂 love this guy
Glad I had the captions on for that one lol
I sent a screen shot to everyone I know LOL
How the hell is this guy so good at explaining all these things? Another brilliant video. Keep up the good work.
I've considered this as well. I think his purposeful periodical pauses to review and summarize the concepts he's just explained is key. I'm trying to learn and adopt some of his style to use on my own session's with colleagues and audience.
Some people are very good at communicating. Either naturally or life experiences.
he isn't....that jar isn't a pulse jet....AND it has 1 moving part. It's a pop pop, or pump "engine". In other words, clickbait. His vane engine had recipricating parts as well....the vanes. This is well known. I suspect he knows this as well, but shines it in favor of clickbait. Unless he actually doesn't know.
Total subject matter expert that understands his audiences much lower IQ 😂
@@adamfabing8250 Well somehow you are still watching his videos.
Quick animation tip:
You can interpolate between key frames without artefacts by smoothing out just particles on separate layer, them composing everything together.
It can be done by drawing primitive shapes and moving them between key frames. No smearing, no AI.
"Krita has animation tweens apparently (Animation curves tutorial)"
Other than that I'm glad to see you are continuing to learn and teach us about even more engine types and keeping the style consistent !
These 2D diagrams and bold text are (together with your explanations) an important part of what makes everything so easy to understand.
Solution looking for a problem. I did not notice anything in the animations that needed improvement.
Or just use Blender, where you can keyframe everything and it just works seamlessly and without much effort, even in 2D.
@@msromike123Yeah, this is a classic example of when someone with high expertise in an area notice something regular people don't even think about.
@@msromike123 At 4:47 the engine outlines are trying to morph and move together with the fuel. It looks almost trippy, to the point where I was wondering if it was possibly intentional or is it just a glitch. Later on the transitions change to simple fade and look very good.
My intention was not to look for a problem or criticise. Honestly I'm surprised I got so many likes and any responses.
The animation is good and it never bothered me before. Simple drawings and showing each state for longer, like freeze frames in cartoons makes everything more clear and easier to understand. This is exactly why I like watching D4A videos and why sometimes fancy 3D graphics with thousands of particles isn't better - visual clutter takes more "brainpower" to process and distracts us from the actual important principles, especially with many things happening at once.
I just wanted to post a... quick tip. So that If he ever wants to experiment with complex movements or morphing - it's there.
or use a different interpolation algo in the video editor
I was NOT going to watch this...until I saw that "Driving 4 Answers" made it.
I am never disappointed by your D4A videos.
Please keep up your creative ways to spread Engineering knowledge.
It is tremendously appreciated.
My father bought me a hobby RAM Pulsejet and we used to run it on 30% Nitromethol airplane fuel. I cant tell you how many times I burned myself or how much hearing I lost while playing with it. That thing used to glow orange and red, it got so hot and it was obscenely loud but it worked pretty well. I mounted it to an rc street car and was fairly fast . Ram pulsejets are a lot of fun and they teach you some really neat science. Great video!!!!
is it make 125cc motorcycle going fast?
@@chiboreachedepends on the size
The good old Jam Jar Pulsejet
Ah the jetman himself
@@interhaker oh indeed.
This is the kind of prototype even I can get started 😁
Had a feeling you'd be here
Tomatoman joined the chat
I love watching your channel grow. When I started you were only at a 150k subscribers. Your quality and integrity hasn't changed since day one and I really appreciate it. Keep up the good work. 🎉
I'm in a totally different line of work but can't get enough of the hypnotic understandable dispensation of knowledge. Great job 👍!
The V1 engine was actually quite a bit more complicated in that it had an array of reed valves ahead of the combustion chamber and also benefited from a ram air effect, allowing it to achieve a higher effective compression ratio and better fuel efficiency for extended range.
Yes it had valves.
Yup, and it was also its main point of failure, but I mean, for something that must work a max of 30min...
Signature…Werner von Braun
For the time being and the cost it was rather efficient. It would be hard to design a cheaper way to propel a flying bomb that distance. So if some of them took a nosedive on the way that was still a win in for the Nazi. No pilot and no plane risked, just a little fule and some explosives.
But as effective tas they were these were slow. For a jet engine it's not very high performance, and British fighters were able to keep pace with then without problem. So they shot a lot of them out of the sky, and some even tipped them over using the wingtip to flip the V1 over. This tripped up the gyroscopic device steering the thing and it turned back and dropped into the sea when out of fuel.
The V1 was a real terror weapon. They were cheap enough to manufacture that the Germans could send a lot of them. They had very bad precision compared to what we see today, but at the time it was just a fantastic idea that they could send them that far and have them hit somewhere in the UK. And that simple engine was what made it possible. And yes, the use of reed valves and ram scooping of air made it a bit more efficient than the puls jet engines discussed in this video. If I remember correctly they also had a constant use of a spark plug to start the combustion and didn't rely on the return of the hot exhaust of the previous combustion. So add a battery and ignition solution to the load.
Insane they went through all those engineering hurdles just to stick them on a cruise missile that would either explode or miss its target. I suppose they didn't have many other options.
So the way the engine works is kinda like what happens when you pour a very full box of milk: instead of coming out smoothly, the milk flow is fluctuating and creating pulsations. In this case, it’s because after part of the milk is poured out, a partial vacuum is being formed in the box, and air needs to get in first before more milk can be poured out, just like in the impulse jet engine, except instead of milk, we have hot exhaust gases. Very interesting design!
Pulsepour milk stream engine, hmmmmm
I used to watch Colin Furze play with pulse jets years ago and thought I had a fair knowledge of how they worked. Now I do. Yet again another excellent video. Yet again thank you for sharing your knowledge in an easy way for the masses to understand. 👌🏼
LOL
"Let's vacuum up the alu particles, we don't want to make a mess of this nice tablecloth"
1 minute later
"Half of the table and cloth are incinerated"
🤣🤣
Amazingly well explained. I didn't understand how pulsejets work for years despite trying to get into the topic. You have explained it so well that it finally clicked! Thank you, you are a great eductator!
I love how educational your channel is, man. I'm a highschool dropout, come mechanic and I can't help but wonder how different life would be if I followed through with this. You make it sound so simple!
never too late homie
I am anxious about the decisions I mad too but I meet so many who are older than me and are starting new things, it really is never too late
I spent 10 years in the car business almost immediately after I graduated (which was just barely)
I left and became an electrician. I still wrench, but mostly for fun these days.
It's never too late to change lanes man, or directions entirely.
I know some people that had worked on Pulsjet RC planes - the results are some really nice looking Messerschmitt and fantasy aircrafts (the smallest of their engines fits inside your palm). And since a few years they have now tried getting a puls-detonation engine going. larger prototypes "work" but are a pain to work with and not reliable yet. Would really love to see them manage to get them working.
There are a few more disadvantages than mentioned:
The thrust is intermittent at the engine-frequency - meaning it imparts massive vibrations that need to be dampened right at the source.
Thrust-control is poorly understood and most attempts rely on a combination of limiting fuel supply and air intake.
Love these engines. They are VERY loud, but extremely simple.
you should create a pulsejet vuvuzela!🙉
You are insane but that's genius. The best explanation of acoustic and thermodynamics physics yet.
Your ability to explain physics and mechanics never stops to amaze, this is the first explanation of a pulse jet which really gets me understanding what happens inside that tube.
Fun fact: If you scream at the intake pipe you create an expansive wave and double the thrust
Ain't no way, but sounds cool
I'll take "Sht you just made up" for 800, Alex.
But still hilarious. I want to see someone try. Preferably someone I don't like too much
I have to congratulate you for the exciting diversity in your selection of subjects. Thank you for pointing out stuff we take for granted but =have a fascinating background with is hidden from the average on-looker.
0:56 That is the look of a man who knew it was going to work, but surprised himself with how well it worked.
Lennox built, marketed, and sold the Lennox Pulse warm air furnace for many years. They had some weld issues early on but after that is was a great, albiet loud, furnace used for residential homes. Also after the early models they started using mufflers on the intake and exhaust to quiet them down some. Lennox added moving parts to their design. There was a small inducer/purge fan to clear the chamber and start the flow. Has a lawn mower style spark plug to ignite the mixture initially with a flame sensor to stop the spark and inducer fan. The intake and the gas valve both have a "flapper" valve to prevent gasses from flowing backwards. The main exchange is cast iron and the flue pipe and secondary exchange are stainless steel. There is a pressure switch to verify flow and detect a backup of condensate if the trap becomes plugged. After a normal heating cycle it is very common for the air circulation blower to come on a second, and even occasionally a third, time because the cast iron exchange would heat the air that much while cooling down. The purge fan comes on after the heating cycle to clear the exchage. It is to this day the only furnace I have tested and had a reading of 0 PPM CO at the exhaust. The first time that happened I thought the machine was broken but it ended up being fairly common to have very low or a 0 reading. It was ahead of the times and will likely be a never again furnace. One of the coolest furnaces ever made IMO.
my brother had one of those.it was in the house he bought 25 yrs ago. i think he got a new furnace like 5 years ago not a lennox
@ronblack7870 he's better off not having a newer Lennox. Harder to work on the newer designs.
I remember building one of these when I was a kid using plans from the back of a popsci magazine that cost $12 + $2.99 shipping and handling. Since this was back in the 80s I didn't have anything other than the plans for guidance. It was a design that used reed valves and because of my limited budget and skill as a kid, I found that to be the most difficult part because all I had to work with was old tin snips...and the reeds needed to be flat. I used a hammer and a scrap piece of steel i-beam to flatten them as best as I could. I was able to get it to start and run for about a minute before my mom told me to never do that again or someone will call the cops. Probably accurate as I did live in a city at that time. It did not explode though, which was a possibility in my mind, coupled with the fact that I was using gasoline as the fuel.
I think that u-tube design is good but you may be able to improve the function of a pulse jet by using reeds, and rather than using reeds you could use a rotor with a weighted outer ring. My idea here is that as part of the start-up process you use a portable starter motor or compressed air to spin up the rotors, which have the weighted outer rim to act as a sort of fly wheel. Once they are up to speed they will provide a mostly steady air flow and positive pressure, possibly even boost, and the pulse jet exhaust would keep them spinning. Sort of a turbo effect, allowing you to burn more fuel more efficiently, thereby boosting thrust.
This ties so nicely into your two-stroke exhaust manifold video! Bravo
This was amazing! I had never considered that a jar by itself would pulse like that! Wow!
You truly have an amazing way with explaining things!
Your videos are quickly becoming top of my favorites when I see posted. I literally stop what I’m doing and watch.
0:24 My German heart stopped for a moment, but then I remembered that you are East-European and probably do dangerous things like this all the time and are a trained professional.
Yes, that wasn't TÜV approved.
you think that that was dangerous????? As a Polish pearson this was safer than walking around your house
I always thought he was German, huh
@@Ammoniummetavanadate If he was German he would have used a Ständerbohrmaschine instead of an Akkumulatorenschrauber and not hold the jar in his hand, but secure it on a Maschinenschraubstock, to minimize the risk of getting injured. And also he would pronounce Porsche the correct way.
@@yannnique17 my German is sketchy but basically you said he would have used a drill press? Seems overkill for drilling a jam jar lid.
And this is why I love this channel. This is something that I could actually build. Although I most likely never will because it would never turn out right. But the fact that I know how to do it is just amazing to me 😊
2:17 the man, the legend, the insanely cool rocketman from the youtubes
As soon as I clicked the video, I just knew a clip of him would pop up in it. Dude's a legend!
2:33 ohh... no footage of Colin and the Saftey Tie.
4:06 Here we go.
The attention to detail with the customized subtitles -- chef's kiss!
I just found your channel (it appeared on the outro links on the Plasma Channel - another great watch).
I knew the basics of the pulsejet, having watched many of Crazy Rocketman and others, but never decided to learn the full concept, usually because it was too dry and boring. You, sir, make it fun and entertaining. I mean, who wouldn't want to see an engine made form a jam jar?!! That was a great hook! Then the rest was interesting enough, especially with your way of narrating it...excitement, stressing etc...more than enough to keep one entertained and following along!
Well done, well put together, and well received!
And now we really know how a pulsejet engine works 🙂
SUBSCRIBED!!
Exemplary and world class tuition. A very gifted individual. Thanks for the super interesting lesson.
Some of us are legitimately learning so much from this channel! When the acoustic section came up, I thought, "Oh, that's just like a two stroke," right before he said it! I only knew that that from another video here, I'm not sure how long ago.
Keep up the amazing work!!
Nice to see a real genius for a chance. He is pedagogical top one in the world. You simply cannot stop watching him because there is so overwhelmingly strong stream of information pouring in without the usual load to fight the gaps.
NGK....good plugs, I've used them a lot and they worked well in your demo ! Thanks always very educational and enjoyable, take care from Australia.
Champion, Bosch and Denso left the chat..
Thank you very much for this. When I was a kid, I used to fly control line planes. I was always fascinated by control line pulse jet planes. Yes, you are absolutely correct, pulse jets are incredibly loud. Have a really lovely day.
Thanks!
I really apreciate putting the script in the description, I scroll RUclips even without audio sometimes and reading was nice. Did get to watch the whole video at home tho
This really takes me back to my undergrad intro to compressible aerodynamics.
Isn't there a danger of the jar to explode?
@@MarianLuca-rz5kk Of course there is. That makes it more exciting!
Excellent! You are really good at what you do. I never knew how complex the process is until now. The German "buzz bomb" was pretty advanced technology, but cheap to build and fly.
What a coincidence, I've been thinking about these every day for the last week, I've watched just about every single one of the videos he showed here of pulse jets running, and now he uploads a video about them, how lucky I am!
YOU SHOULD'VE STARTED WITH "Here before me I have a standard pulsejet" or something similar
This deserves so many more subs!
The v1 used a pulsejet which added more to the terror of a flying bomb just from its noise.
Though it used a Valve-controlled pulse jet, which has moving parts, but is more aerodynamic
An excellent scientific explanation and description of how a pulsejet engine works. Thanks for making it understandable by defining the technical words clearly along with diagrams showing how each word applies and what it actually does. It is also well arranged by sequential explanations, so as not to confuse one part with the others. Few people have the ability to make a process so easy to understand! You sir are one of those few. Thank you!
Nice! Finally someone explained to me how the physics of this thing work. And you're wearing a shield! Great! :D
Wow, what a great explanation on this subject. Put into simple small steps pointing out the important details. So easy to listen to.
This man should have 12.5m followers, not 1.25m
And great vid, thank you.
Detonation is neither uncontrolled nor necessarily damaging. In fact it leads to a substantially more efficient engine.
Isn't there a danger of the jar to explode?
Exactly look at Nasa's RDE research
@@MarianLuca-rz5kk I mean I wouldn't do it in a glass jar just like I wouldn't use glass pistons in an internal combustion engine.
@@petergerdes1094
Thank you. I feared similarly about the safety.
Correct. And, if my understanding is correct this is why diesel engines are more efficient since they run off of detonation. 👀
I posted a video tutorial on how to make this and different possible fuel options!
Didn't go into detail about the physics and mechanics because I didn't think people would be interested but looking at these comments I'm glad that the interest in science is there! :D
Great video and concise explanation, as always! You can see just how many attempts it took to start the glass gar engine, with what it did to the table top)
"Safe drilling noises" in CC hopefully means gloves were used at least once ;)
Excellent content. As a retired R&D engineer, very nice presentation, easily digested. But wait, no mention of entropy? ;)
2:10 Heading for London
Had always learned about ramjets, this was the first time I heard of a "jamjet"
I think this might be the first time I've seen the actual title of a video appear only in the thumbnail, with the subtitle occupying the "title" space...actually pretty effective! I don't hate it 🥰
Dude the educational prototypes you build for your videos, hell yeah brother. I love your channel
one of the best youtube channels
easy to digest information
quality&simple grpahic aids
keep up the good work
3:33 My favorite type of understanding
What do you think about the following idea:
This innovative internal combustion engine design centers around a spherical combustion chamber, augmented by a Laval nozzle and a rotary vane mechanism, all working in concert with a turbocharger and a valving system. The process begins with air being drawn in and compressed by a turbocharger. This compressed air is then directed through an intake valve into the spherical combustion chamber. Fuel is injected directly into the chamber, creating a pressurized fuel-air mixture. Upon ignition, the expanding hot gases are channeled through a Laval nozzle. This nozzle accelerates the gas flow to supersonic speeds, converting thermal energy into kinetic energy, and simultaneously lowering the gas temperature through adiabatic expansion. The high-velocity, cooled gas exiting the nozzle then enters the rotary vane section. Here, the kinetic energy of the gas is transferred to a rotor, generating rotational power.[1] Finally, spent gases are expelled from the engine through an exhaust valve.[2] These exhaust gases drive the turbine of the turbocharger, recovering energy and further increasing overall efficiency.[1] The spherical design of the combustion chamber promotes uniform and complete combustion. The inclusion of the turbocharger maximizes power output by increasing the density of the intake gases, while the valves precisely regulate the flow of both the intake mixture and exhaust gases, optimizing engine timing and performance. The Laval nozzle's dual function of accelerating the gas and reducing its temperature contributes to both improved power output and reduced wear on the rotary vane mechanism.
I do not have the efficiency of communication to express how grateful I am for the understanding you share.
Saying Thank you feels like trading a stick of gum for a freezer full of steak.
There are engines out there that are way simpler than a pulse jet. Ramjets work in a very similar to normal turbo-jet engines, only they use intake ram air pressure instead of a compressor, eliminating the need for a compressor and turbine. Literally all that is left is a combustion chamber. That is it, there is nothing more to these engines. As they rely only on ram air pressure, they only work at extremly high airspeeds, but that is besides the point.
If you want an even simpler engine, then there are always monopropellant rocket engines, which also have no moving parts beside the fuel pump and do not even require a spark.
And if you have an autopressurising fuel, you can remove your pump and just have a valve, now that's a simple engine
And a solid fuel rocket only needs a lit match!
Another excellent video. I had a basic understanding of pulse jets before, but as usual you add a lot of depth. I really enjoyed your video on 2 stroke pipes as well.
I had wondered how those things worked. I understood the V1 valved pulse jet, but how a shaped curved pipe did it was mysterious. Thanks for cutting through the mystery.
When I was a kid I read a description of how a pulse jet engine works (some WWII book or the like). I didn't really get it, it was just word salad to me. Ever since then I just assumed that it was all a bunch of physics and left it at that. With this video I feel that I completely understand the principles of how this device works. Enough so that I can pass the knowledge on to the next generation. That alone was worth the sub to your channel that I did a couple of years ago.
Best explanation I've ever heard 👍
Great information! Wow, it is basically a putt-putt model boat motor, except with fuel and igniter.
the straight pulsejets with the bulbous front end and long tailpipe are usually reed-valve inlet engines.
I was wondering how these work! Thanks for this excellent and engaging explanation! 👍
me again, loving these videos. thanks for them.
Love your Videos ! Great explanation of how different engines work .
The original use of expansion chamber on a two stroke engine was pioneered by Walter Kaden who was working for the East German company MZ. He had been involved in the development of the Vi during WW2. The MZ dominated the small cc GP racing in the early sixty's. The factory rider for MZ defected to the west and later worked with Suzuki to develop there winning engines.
Super interesting and very well explained!
Now please do ramjets (although I wouldn't expect a live demonstration like for this one...) 🙂
Cheers!
I always used an Aquavelva, Lectric Shave, or some similar after shave or cologne bottle because there is a narrow hole in the neck which condenses the exhaust like a rocket nozzle. The alcohol based vapors make an excellent fuel as well. Those things really look cool at night when you ignite them in the dark.
I wish you were a tutor at the technical college I attended.....lessons would have been much more interesting and understandable. Many Thanks for your efforts in making these vids for us.
Clever engineering!
as ever, yet another superb explanation of a challenging subject.
I remember hearing stories from my grand parents generation about the horrible noise that came from the Doodlebug (V-1 flying bomb) as the flew over England in WW2, something many of them were haunted by for the rest of their lives.
Thanks for this. always wondered how the V-1 engine worked. Did not know RC planes used pulse engines.
I learned a lot from this video, thanks for going so in-depth
Anyone seen the Big bigger biggest documentary aircraft episode with the scientist explaining the jet engine whilst holding a plastic water dispenser bottle and saying "THIS, IS A JET ENGINE". I always burst out laughing that phrase lives in my brain rent free😂
Hey! I am a huge fan of your channel. I love your method of clear, accurate, and simplistically effective explanations. They really help breakdown and allow people to understand the basics of complicated processes in engines, the engineering behind them, automotive and aerospace alike. Please do a video on detonation engines. Pulse Detonation Engines, (PDE), and Rotating Detonation Engines (RDE). Pulse detonation engines are almost like glorified pulse jets and are a very fascinating topic to me. P.S. -Another video topic idea that would be sooo cool would be- compressor surge/compressor stall in jet engines, I've found that the principles behind it are essentially the same as turbo flutter in turbo cars. (There are a couple videos of jets with compressor stalls/surges on youtube, they're hard to find but they sound just like turbo flutter except much bigger and louder.) If you read this, please let me know what you think!
This is a triumph of explanation. A team I was in as an undergraduate built a steam pulse jet, which just about worked. I had little understanding of the acoustics, though. I'd really value a frame by frame step through showing the three elements happening at once. Has anyone installed speakers in a conventional exhaust in an attempt to tune the engine?
Interestingly, I inadvertently made one by trying to burn out the carbon/soot from the exhaust pipe off of my old KTM 250EXC and a map gas torch. It had practically no thrust, but the noise certainly startled me at the time.
Haha! My friends older brother did that in high school on their YZ125.
Very cool. You explained alot of engines. How about ramjet/scramjet next time?
So what you’re saying is that an empty beer can is a jet engine? I never realized I built so many jet engines.
Thanks for simply explain the system in all aspect❤
12:34 2 stroke jet engine!
Thank you Kevin Cameron!
Seen many videos about pulse jets but as usual d4a explains it in such a perfect way even morons like me get it!!!
best subtitles ever
It's a good thing that you vacuum cleaned the table top cover before burning few holes in it =)
Awesome! I guarantee you this video will be shown in physics classes along with a glass jar demo like yours at the start. :D
Great video as always! When you listed the Cons, I was expecting you to say something about lack of speed/throttle control. A given pulsejet will always pulse at the same frequency, I suspect, and have more or less constant thrust.
Man, this is genius-level explanation!
Another excellent work! Full of skills and information!
Would love to see some experiments using passive valves and nozzles to increase pressure and gain efficiency.
10:56
And just when I thought I was out - they pull me back in!
I almost legit cried at the beginning thinking "if my highschool teacher did things like that I would've been more interested in my education"