Home Made valve-less pulse Jet engine
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- I had a lot of fun making this video and I will leave resources for anyone that wishes to repeat it.
Also I am trying to build up my channel so a subscription would be great. I would love the opportunity to make more videos like this.
Here is the parts list with links to all of the parts and some basic pulse jet resources.
docs.google.co...
Here is the link to my Patreon (thought it couldn't hurt to try to make one of these)-
patreon.com/JamesJudson
Fuel system components
-Copper Tubing
-Grill I used (anyone will do this was just the one that I happened to get for free)
-The adapters are a bit tough to find so just make the best of what your local plumbing store has
-Propane tank
Engine Body Components
-Spark plug adapter
-Steel 3 in fire extinguisher (find an old one for free!)
-1.25in steel tube
-Intake tube
-NGK Spark plug
Electrical System Components
-Six volt battery
-High voltage generator
-Momentary switch
-Box used
-Battery charger
Tools used
-Angle grinder
-Cordless drill
-Cheap welder (can't say I recommend it)
-60-13 Welding rods
-Stepped bit
-air compressor
Pulse jet forum
Full v1 video
Pulsejet engines are quite hard to start but you’ll get the hang of it !
I was heavily inspired by your pulse jet videos. It means a lot that you would watch my video.
Hey Integra I just got done watching the video were you turn your Dyson hair dryer into a jet engine
Hey Intengza can you give me a shout out please i love all your videos and i am subscribed to you
It’s wonderful to see support from the youtube maker gods for great work like this
when the video has a pulse jet in it i already know you will be here lol 😂
There were young folks like this when I was in high school, and it's great to see they're still around. Go, James!
I'm studying jet engines.
TH-camrs like you should be known to the world
I've watched a lot of videos, but I'm the first person to explain it so easily.
I'll give it a try
Before that, I'll have to learn welding skills!
I have been " Skilled Trades" for roughly 40 years. I am absolutly impressed with your knowledge of hand tools and fabrication.
Keep hitting it, learn grow and get porficient.
You are going places in this world.
Finally a good channel that explained EVERYTHING and shows the whole process!!! so underrated!!!!
Well ,I got my plans from an old timer I knew as a kid,and tripled the dimensions, it was 15 feet long, and I couldn't get it to run, just pop, bang, not much run. Then after cutting intake and exhaust then adding dimension to combustion tank ,ect. I realized you. DONT USE A REGULATOR! Straight from the tank! Mine, and YOURS definitely would have run without a regulator, if you still have it, try it out and you don't need special fittings,just a fitting that goes onto the propane,rubber hose it, doesn't need to be high pressure hose hen to the metal line into your intake. (My latest, Pierre Laboom,shorts, pulse jet snoblower) KEEP UP THE FUN!
mind sharing the plans? sounds like a fun read.
And don’t stop doing such. It’s curiosity and ingenuity that move the peg. You rock
You can weld thin metal with a stick welder, If you use another welding rod, with the flux roughly chipped off. Introduce it to the weld pool like you are tig welding. You can then regulate the weld pool temp by introducing more rod. Good job on the parts for the pulse jet. I made one of these about 40 years ago my design was a little different though. worked great for about a minute & about the same after I rebuilt it stronger. My father banished me from the shed after that. (very wise since it was his business location & it was a wood building) I also nearly burnt it down a few years later. Fire brigade saved it.
What kind of amperage would you run?
@@jamesjudson67 well that depends on the material thickness. It takes a little getting used to the technique & best to have a self darkening helmet as you need to use both hands. once used to it you can even bridge some pretty big gaps.
You sound like me, I almost burned our house down in Chicago, back in the seventies, doing much the same as here.
Texas tig welding
Yay an another Integza and colinfurze going to be fun watching your journey. Don’t stop you are very good with your video and a great engineer.
At least you tried and it wasn't a failure but, a steeping stone in your next project! You go James!
Respect ! I noticed you wear protection (googles, gloves, apron, hearing muffles), this is very important and I saw full grown adults on youtube skimping on that.
I subscribed as soon as I saw how young he was and how passionate he is. If more young people would use their time pursuing productive outlets instead of putting rings in their faces and hating everything we would be back on track as a nation in no time. Kudos to this young man!!! Yes I said it... man!!
I agree with you on this 100%. I have vowed to myself that I will one day set up a tech lab in my country and accommodate every young soul that intends to innovate anything legal they think about, however wild it is, as governments will never do this, and Universities will not take anyone from nowhere into their labs, and many of which don't have them in the third world. Sub-ing right away too.
To be honest (and from my very limited experience), when a pulse jet starts up and only sustains with compressed air, it almost always boils down to a geometry problem.
For example exhaust too long/short (which you tried), intake too far back/forward, needs more than 1 intake, fuel injector/spark in the wrong place, combustion chamber too small, intake/exhaust area too small/large, etc. No guarantees that any of these will help but that's what I'm inclined to thing. Also maybe braze the copper tube onto the jet to help with better heating of the fuel
Great to see such analog talent still exists
I like your style👍
Hang in there you’ll get it. Combustion tech is very difficult.
A friend of mine started young is now a propulsion engineer for NASA.
For an engine that size you're gonna want to get rid of that regulator. Keep going with it kid these engines are allot of fun.
Taking out the regular would probably a good call. I just did not have a connection point to the tank otherwise.
@@jamesjudson67 there are two types of propane regulators on the market, high pressure and low pressure. The ones you find on BBQs like that are low pressure, and won't put out the volume you need. You might find a high pressure regulator on something with a much larger burner like a turkey fryer, or you can get them off Amazon. A high pressure regulator will have an adjustment knob on it, and sometimes a gauge.
The only real suggestion I can give is crimp the end of the copper tube rather than make holes. This would be like putting your thumb over a garden hose for a jet of water. (Sorry, needed a visual model to be sure it was understood.) Then maybe use a valve to control the input for maximum thrust.
Very cool to see this. Keep experimenting and learning. I spent my youth in my parents basement building model airplanes and learning about machining and welding. 40 years as a self employed machinist is the result.
If the engine won't stay running without added air then that means that you are running a really rich air fuel ratio. Try using a copper pipe with one hole for your fuel delivery and no compressed air
One thing i found that helped start and sustain burn is to pre heat the combustion chamber until glowing red, thein try starting the engine.
Would that help with fuel flow also?
@@jamesjudson67
i would say yes, but start as normal, another thing to try is moving your forced air back and forth to get the best air/fuel ratio. Just mess with the ratios , youll find the sweet spot..lol
Great work buddy and don’t be put off that it didn’t self sustain, with perseverance you will definitely get there!
I totally can relate to stick welding thin steel, great video!
To get your pulse jet running, you just need to get the air to fuel mixture and the pressure right. I buildt my fuel line out of an old breaking line, you have to get the diameter of the nozzle juat right and things will get way easier. Good luck and keep building!
This is so cool. You make me feel so dumb and that's a compliment
Keep trying! Very few people achieve sucess on their first try, and much can be learned from failure.
If you are using a extension cord on your welder, if its not rated for the amp's that the welder draw's then your welds will come out really bad, and its heard to keep a bead going. Plug it directly in to the wall socket or find a larger extension cord rated for welder's. 50 AMP rating. Nice job on the pulse jet.
I was just going strait to the wall outlet (with the correct amperage rating). Since then I just decided to switch out my system for a cheep flux core setup.
🧐 In 2020 one passenger jet did Under 5 hrs from NY to London.. just sayin..
Great video bro..
This is so impressive, thanks for the video!
HEY @James Judson, i have built a few now and a few recommendations for you to help get it running:
1. I noticed towards the end you had a mig, id recommend using that for all the welds, there shouldnt be any extra lip on the inside of the engine because it will upset the natural flow which is what the engine depends on to sustain running because it goes off acoustic resonance of the detenation.
2. The length and shape of the exhaust compared to the combustion chamber and intake is also important.
3. Fuel injection positioning is also important.
They are a fun project, but not a toy so stay careful because it can be dangerous if you neglect safety and precaution. You can do it. You almost have it. The inner dimensions are very important with proportions and cleanliness of the joints and they can make or break it. Make sure to not leave the flow regulator on the hose from the bbq because it restricts the flow to much and will block the flow if the combustion triggers the safety valve.
One more thing, try turning your propane tank upside down so it feeds liquid propane into the thing giving it more fuel to use, and it also will run better once in a hotter state so if you need to run it best you can to heat it up then try going for full on run.
Those are some good suggestions. As for the mig welder, I purchased it right at the end of the project. Ideally I would have used it the whole time. As for safety, I try to take all of the precautions that I can while still being able to work on projects like this one. When I make a second attempt I will definitely keep your suggestions in mind.
If you want the engine to self-sustain, you need a reed valve to keep the explosion inside of the engine's main body, if you wanted to use a valveless design then there is a special ratio needed between the intake and the exhaust tubes and you weren't even close to this ratio, I urge you to keep doing more research into the valveless style pulse jet engine. The Germans did experiments with the valveless design of pulse jet engine before going to the valved engine with shutter style reed valves that closed the intake with every explosion inside the body of the engine. You did very good for your first attempt, so don't give up, keep at it and perhaps you can be like a guy who did a bunch of TH-cam pulse jet engine work and eventually started making and selling kits for people to make their own pulse jet engines, I'm sure you can find his videos here on TH-cam.
You must be talking about Robert Maddox "Rocket Man "! I've been enjoying his creations for years now...
This video has cogs turning in my head lol might give this a try someday sounds like a fun project!
I'm your one thousandth subscriber!
Thanks so much, that’s a crazy milestone!
i would not be surprised ro know that bro will go on to be a scientist at jet propulsion lab of caltech
Great video, amazing editing.
Nice job, there is a video on TH-cam somewhere with a couple of guys that make one of these and put it on a sled. They rocket around a giant frozen lake somewhere in Sweden. You may want to search for it and see what they did. Yours looks similar, theirs is just a lot bigger. So I'm sure you could probably get yours going with some minor tweaking.
I saw that video, that thing looked mean.
Do you think if the intake was relocated and make bigger along with the fuel line put into a fitting and the fitting onto the extinguisher tank it would work and ignite smoother? (I am trying to make my own out of a fire extinguisher bottle)
Intake and exhaust have to be in a fine balance for a good running engine. For me it was tough to find steel tube with the right inner diameter to accommodate the engine. I think it is a good idea to relocate the fuel line. It would clear up the intake nicely.
Also you should make a longer conical structure when you are connecting the exhaust to the combustion chamber, it helps , for me it did.
Burn through is a primary indicator of improper weld technique. A few pinholes means your weld is not solid. Since you didn't specify your settings, and didn't clean well enough for 6013, I'd grind out the welds and try 7014 for a redo of the welds since 7014 is as versatile as 6013 but doesn't blow thru as bad. I'm convinced most beginner welding courses start with 6013 just to make thorough and effective cleaning (and proper joint fit up) before welding into a habit. That and the burn through is a sure indicator to the instructor that the student is having problems with technique.
Leaf blower is good for start up.
Interesting project and excellent video production. Keep it up, you're sure to go far! 🤓👍
Never stop doing this
I think the next thing I'd try. Is maybe some kind of restrictor on the fuel side. Might be a rich mixture issue. Maybe at the end of the fuel line "where it enters the intake" fit it with something threaded. So you can try different jets. This way you can have good pressure on the fuel side, which means you have good fuel discharge rate & a better ability to control fuel mixture.
The fuel tank valve can restrict it enough, all he would need is more air introduced to the mixture to offset the mix to combustility. I run my little one with tank upside down so it feeds liquid and i basically need it unrestricted on fully open to get it to run. Its a twin intake but stainless steel and gets almost white hot
Nikolaj Afanasievich Teleshov did NOT invent the pulse jet, he merely patented a steam pulse engine around 1867. Martin Wiberg from Sweden, and Robert Goddard from the UK were the fathers of the pulse jet.
Good job. Id love to see your Mark II attempt. We'd love to have you on our robotics team.
Bro, for personal Project I just built an app not a godamn jet engine..
How great of you!! Everybody can find the tools on internet to build a bloody app; not many can find the parts or build themselves an engine just out of their hands. Please lower your brainless arrogance a bit; I think this kid will build an app on the site how to build a jetengine
Then build an app that can fly you. Or even power a car.
Shut up
For someone like me who's least favorite part of any electromechanical project is writing code for microcontrollers, building something that doesn't require any code sounds nice.
To be fair, I think your project is equally challenging you just have different skillsets. Same as how I imagine you learned software development, engineering just requires binging a shit ton of youtube videos, obtaining the right tools, and then giving yourself some hands on experience with some easy projects.
Unfortunately unlike software, it required physical space for machines and a somewhat high upfront cost which are not luxuries that everyone can afford so a lot of the "experience stage" is unobtainable in that case :(
You need to manage the fuel-air mixture, and I think a check valve at the intake would help
This is crazy in the best way possible!
Impressive I wonder if intake was to small? I want to try it now thank young man!
The issue that you are having is clackers you have two exit points for the exaust
Your idea and my idea of a"working jet engine are quite different"
Heck of a job! Great video.
Great video! Hope you're having a good day. Can I ask what formula you used to determine the length of the exhaust and the combustion chamber?
Twenty thousand would be insane
this guy may be the new integza
Great stuff but I wanted to hear the pulse engine and all the noises involved in the making of it, not some random music. I do wish folk would stop putting music over informative videos. The audio is a vital part, the music overrides it and is superfluous. Good stuff though and what are you going to try next?
crimp the end dont drill small holes and the crimped input should face the intake. it will work
Good job on your video. Subscribed.
At 1:19
Pulse jet being replaced by the turbofan....
This is incorrect, it was replaced by the turbojet....the turbofan the somewhat different beast.
Please at least make a pinned comment about this oopsy of yours....thank you!!
To my knowledge a turbofan is a member of the turbojet family. I mentioned the turbofan only because it I used used today in both commercial and military planes and remains one of the most popular. I could always be wrong, so I will go back and make sure.
What height voltage generator did you get
Hey you should get yourself a wrap around for when you are drawing a cut line
Very impressive! I love your determination. Welding gets much easier with practice, but your insight for your age is very cool, so do not get discouraged. Everyone had to crawl before they walked. Not sure if your into motorcycles, but Google the Y2K bike, I think you will see it is your ideas on steroids.
Please keep trying to make these!
Good job! Keep it up. :)
Thanks!
OK, that was an interesting video....thank you for making it.
I do have a question though:
Why did you choose this design? There are multiple designs. The one I have seen the most of is a horseshoe-shaped or U-shaped design.
The ones that the Germans used had a flow-through design like a ramjet, but a spring-loaded door in the middle closed during combustion and opened during exhaust. That one may be the most difficult, the u-shaped one I have been told as the easiest....I I would suspect that the one you made is somewhere in-between.
Look for videos of some guy with a long beard having a jet powered bicycle or reject powered go-kart.
I would like to see a Mark II, by the way.
Have an excellent day!!
Good question. At the end of the day it came down to the resources that I had available to make this project. The u shape may be simple in design but the materials and tools required to make one are a bit beyond the capabilities of my small basement shop.
@@jamesjudson67
Kwel beanz!!
It is kind of unfortunate when you can make it this time. From what I understand, it is the easiest one to get running. You just have to tune the lengths of the pipes. It will then run until it is out of fuel....
Next time try 6018 or 7018 welding rods. The weld technique is to simply drag the rod/ Look up on YT for hints and examples. And, for any kind of welding you have to have clean, bare metal.... no paint, rust or coating of any sort.
Actually building a turbine engine doesnt require 20k moving parts. all youll need is 2-3 bearings, a compressor, and 1-2 turbines depending on how efficient you want the thrust gained from the flame to be and of course the center shaft everything connects to and goes into the bearings. from there you will just need a combustion chamber and fuel which arent moving parts. if you do plan on trying it I recommend using a gas fuel such as butane/propane as to not worry about high pressure fuel delivery systems. I myself am currently trying to build one for my High School engineering class as its my senior year and I want something to take home, though it has been hard due to this project being self funded and I own my own apartment so I also have to paint rent and I can only work a limited amount of hour bcuz of school but hopefully I get there.
The 20 thousand moving parts came from a commercial engine. I know that most diy turbofans don’t operate with that many moving parts.
Good job on your efforts. Messerschmidt could have used you on his development team for the argus back in the day!
Nice job
I think you did a great job. Would you need the air compressor if you had a bigger inlet(the entire front of the V1 was open)? Or would the air compressor make up for the ram-air effect provided by flying? Again, great job!
try a shorter exhaust to constricting, for your welds try a mig or a join the dots approach with a 5 mm gap between the dots,. just keep going around till it all welded keep trying you'll get there
Good afternoon, you need to increase the volume of the mixing chamber and reduce the diameter of the exhaust pipe
good job man
Great job
A few years ago a flight over the ocean was complete normal, even a few decades ago we fly between Europe and USA.
I think you need to invest in a MIG welder. Good work!
Try using a Flux core wire feed like the cheap HF units, stick is difficult on thin metals unless you are a experienced welder, still a nice attempt on the engine though.
The air fuel ratio was off, so it would not stay running. If you can regulate the fuel better it will run.
Stick welding thin material with stick isn't easy.
You really need some backing-material as a beginner. Fill the pipe with sand, this will help with the burn through.
Weld hot in short burst and let the weld cool. Don't try to weld with lowered amperage, this will only end up in "pockmark" welds.
Try the "weld through" method. Take some iron sheet and put it over the weld area and weld through the covering. If have both hands free you can use a nail for that. Both methods add material that has to be heated up and so lowering the temperature that goes into the pipe.
Did you try with liquid propane?
Integza had the same problem, his designs were meant for liquid propane and he was just using the gas.
Good point. I probably could have turned the propane style fee upside down to get liquid propane. It is more challenging to atomize liquid fuel it I may have made a significant difference. For this iteration I just preheated the tank before use.
Good job for a young man 💪👍
What are you using for fuel?
Well done!
good job bro you can be famous ♥️😑
What fuel did you use
Well done
Hey Judson,
Random thought, but could the reason you are not getting a self sustaining combustion be the placement of your intake? With the intake in the place that it is, the shortest path between intake and exhaust does not cross the ignition. If you were to swap the placements of the intake and the ignition would that make a difference?
Your fellow teen, Jerry
You should look at few videos by Integza it will radically help your jet engine making. He managed to make self sustaining pulsejet from carbon fiber. altough the design is different (slightly) but it will make it more clear. you can also try to make a shockwave engine first, then pulsejet Mk2 the try your best at a rotating detonation engine. Integza always give 3D models of his builds so you can actually replicate the whole process with his schematics.
I dont know a lot about these engines but i tought that if you would try to make a «choke» system that controls the air that enters, maybe you would be able to start it beacause maybe there is too much air and it blows the flame up at the beginning
I'm curious as to why you shortened the combustion chamber. Is there a formula for length opposed to radius? Or, did you just wing it?
James. Have a look at Colin Furze channel he builds pulse jet engines, I'm sure Colin would give you advice. He builds some totally crazy stuff.
I am a huge Colin Furze fan
Good effort 😁
Congratulations, excellent work. As a non-technical observation, I would like to inform you that the photo you are using, labeled as V.V. Karavodin, is actually that of the Catalan inventor Ramon Casanova i Danés. After the fascist military uprising in Spain led by General Franco, Ramon Casanova had to flee to France. Shortly after, when France was occupied, Hitler's army stole them, along with all the other French patents. It appears that Ramon Casanova's already functional design was used by German engineers to manufacture the engine for the V1 bombs.
A fine first effort. Keep trying!
Also try increasing the diameter of the air inlet and slightly increase the fuel in proportion. and increase the cirumference of the combustion chamber more space and more fuel should defintely help. If it doesnt the well....meh
surprised you didnt strip the paint off first. Maybe you do. idk about a painted engine lol
Maby increace intake size? Or lengthoft the intake
I actually tried a bunch of stuff with the intake after filming, but to no avail.
Good learn and research. I subscribe you..
Lol i bet that jb weld smelt awesome when hot
What keeps expanding gases from pushing back into intake?
The exhaust is larger than the intake so the air is forced out of the exhaust. That creates a draw like in a fireplace. That pulls more air in through the intake and the process repeated a few hundred times per second.
Ignition of a gas creates its own suction it's not larger pipe size it's longer fires going to get its food just like you as quick and easy as possible so shorter section on top o2 in the exhaust is longer is going to push it out these I built two similar put them on my trike it was clocked doing 63 miles an hour ago by a cop and it wasn't that I was moving that fast it was noise level also proper fuel to air mission with helps a lot that's why he had firing problems
Read about PULSE JET ENGINES.... interesting engines with no moving parts.... except the fuel control
My question is, when do you let all the gas out?
I don’t quite know what you mean.
I mean like when do you let a vowl open?
I have made one with but it’s just a pipe and a can