Pulsejet engines are quite hard to start but you’ll get the hang of it !

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. KZfaqrs 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!

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!

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!!!!

And don’t stop doing such. It’s curiosity and ingenuity that move the peg. You rock

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.

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.

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.

Great to see such analog talent still exists

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.

At least you tried and it wasn't a failure but, a steeping stone in your next project! You go James!

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.

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

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 made a pulse jet when I was 16 years old. I am now 73. You need I moving part, a petal valve, fitted between the fuel input and the combustion chamber. I made mine from razor blade steel.

This is so impressive, thanks for the video!

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

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!

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.

Great video, amazing editing.

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.

This is crazy in the best way possible!

Keep trying! Very few people achieve sucess on their first try, and much can be learned from failure.

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.

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.

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 KZfaq 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 KZfaq.

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.

Also you should make a longer conical structure when you are connecting the exhaust to the combustion chamber, it helps , for me it did.

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.

Interesting project and excellent video production. Keep it up, you're sure to go far! 🤓👍

This is so cool. You make me feel so dumb and that's a compliment

This video has cogs turning in my head lol might give this a try someday sounds like a fun project!

Heck of a job! Great video.

🧐 In 2020 one passenger jet did Under 5 hrs from NY to London.. just sayin.. Great video bro..

Great job

Nice job

You need to manage the fuel-air mixture, and I think a check valve at the intake would help

Well done!

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.

good job man

Nice job, there is a video on KZfaq 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.

Good job on your video. Subscribed.

Your idea and my idea of a"working jet engine are quite different"

Well done

Good job! Keep it up. :)

The issue that you are having is clackers you have two exit points for the exaust

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.

crimp the end dont drill small holes and the crimped input should face the intake. it will work

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

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.

Please keep trying to make these!

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?

Good effort 😁

Hey you should get yourself a wrap around for when you are drawing a cut line

Good job for a young man 💪👍

Good afternoon, you need to increase the volume of the mixing chamber and reduce the diameter of the exhaust pipe

James,See" indoor snow removal pulsejet included" @ Pierre Laboom, in the " shorts" for more " unregulated fun"

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.

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)

Good job on your efforts. Messerschmidt could have used you on his development team for the argus back in the day!

Fire dawg

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.

I'm your one thousandth subscriber!

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

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.

All the best

The air fuel ratio was off, so it would not stay running. If you can regulate the fuel better it will run.

What height voltage generator did you get

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!!

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

Keep it up!

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?

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.

Maby increace intake size? Or lengthoft the intake

Subbed 👍

I cried when I saw those welds

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?

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.

What fuel did you use

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.

❤ awesome

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

Lol i bet that jb weld smelt awesome when hot

What keeps expanding gases from pushing back into intake?

I would relocate the spark plug and turn the propane bottle upside down.

good job bro you can be famous ♥️😑

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.

A fine first effort. Keep trying!

i built a working one with a redbull can and a steel tube

A 7014 rod might have been better

Find stainless/nickel rods . 6013 is available in 1/16” use 20-25 amps . Cut just a half inch from the bottom, and a few hacksaw cuts on the body at the cutline to allow it to collapse and fit in the bottom. Good ideas but you need a mentor for materials and techniques

surprised you didnt strip the paint off first. Maybe you do. idk about a painted engine lol

The size of the combustion chamber is too small compared to the thickness of the injection nozzle, and combustion is well maintained when the air inlet is much narrower than the outlet.

I have made one with but it’s just a pipe and a can

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.

Keep trying you'll get it.

Bro, for personal Project I just built an app not a godamn jet engine..