Heel goed en heel mooi ! The JT8D engines on the DC-9s, MDs and B-717 we flew required so many compressor stages. These pulsejets somehow manage to pull in (suck) enough air to keep the engine from Melting ........Dank je wel, tot ziens.
its an experimental engine, was developed back in the 40s by germany, in simple terms it detonates the fuel while regular engine just burn, it was thought that it could replace jet engines and turbofans, there being no moving parts and over all simpler, but they have been phased out by ramjets scramjets and most recently the SABRE engine
a properly tuned pulsejet produces significantly more thrust than an exhaust pipe. they are less effective than a conventional jet engine but produce enough thrust to easily power a plane. In fact the V1 flying bomb weighing 5000 lbs,was powered by a pulsejet engine, which the German Luftwaffe fired around 100 per day at London in WWII
@ChineseSweatShoppe This is the first test, its just running stationairy because we didnt want to flip the tank yet. We will let it run on fluid propellant shortly.
Tyler Harrington that's not very nice. No need to call ppl dumb. Besides you're incorrect anyways. A welder didnt give the tube that curve lol. Most likely a mandrel bender.
In order to bend metal tubes like that, you need heat, and a bending tool. And for this tube, probably sand inside the tube to keep it from collapsing in on itself during the bending process.
Now, my idea was to mount one of those atop a small boat, anchored in the middle of a small private lake surrounded by homes owned by the fat cats and light the damn thin off at 3:00 am.
I want to make one of these to power an acoustic resonator that converts woodgas to electricity using acoustic resonance via piezoelectrics or a diaphragm and linear alternator. . . Just wanted to pass on the idea, and any suggestions would be appreciated.
+Blitherer Masterman Potential for solid state operation, no need for excessive filtration. . . If I could damp the sound without reducing power significantly, I see no problems with such a design.
I'm studying mechanical engineering but don't understand what you said, could you please explain the function of the acoustic resonator and linear alternator?
Pulse jets are very inefficient due to their low compression ratio (at most 1.2:1). In addition your resonator would have a very short lifetime due to extreme fatigue in the materials used- this problem also affects pulse jets themselves if they are of the valved type (the valves wear out very quickly). You'd be much better off burning the gas in an 4-stroke piston engine spinning a traditional A/C generator. If you really must use a pulse jet, be aware that the vast majority of the heat from your fuel is going straight out the exhaust of the jet without doing anything useful (I'd imagine that you would be lucky to get more than 5% thermal efficiency). You could recover more energy by using the heat coming off the jet and its exhaust to boil water and drive a steam engine than you could get from directly driving some kind of resonator or turbine, though obviously it would be best to do both.
Unless you could develop a piezoelectric converter that could also make use of heat. . . Anyway, it's an interesting train of thought, somebody could make it work somehow, I'm sure. I just like the idea of a singing crystal making electric power I guess. Even 5% conversion would be pretty good around here where there is unlimited wood that is slowly oxidizing anyway. I reckon anything to be possible. Thanks for the input.
I can see the spark plug not being connected to anything, so there is no spark-induced explosion, right? The motion direction of the combustion gas is directed at the beginning by the compressor. This is the valveless pulseless jet engine :)
***** An electric fan will blow the grass around some but it isn't thrust. This is actually a ramjet and a ramjet does not creat static thrust. That is, when sitting still.
Now I don't know about this one but Colin furze built a bigger one and get's around 70lb of thrust out of it, enough to get his jet bike up to 40-50 MPH
Scooter George Pulsejets aren't considered ram engines (the valveless design as showed above couldn't be a ram air engine even if it wanted to because it's air intake is facing opposite the direction of it's intended motion), they can produce 100% of their maximum thrust while stationary. The designs with reed valves have their air intake facing forward, but I'm unsure if higher speeds would equal more thrust or higher detonations per minutes as I don't have any personal experience with valved designs. Although the engineer in me REALLY wants to make one. And perform experiments. Maybe one day
Scooter George If it blows the grass around then surely it is creating thrust! Just maybe not a lot, but for every action there is an equal and opposite reaction. If it is able to bend 1 blade of grass, then the same amount of force required to bend the blade is also pushing the fan in the other direction. Obviously there is more to it than that, as air creates friction against other air molecules, so the grass doesn't have to move to signify thrust, but anything that is capable of blowing air out one end is producing thrust.
The same reason a horn has a tone. The length of the horn and shape of the chamber sets up a resonance this creates a pressure wave. Now imagine that pressure wave being a piston in a normal engine and it kinda gives you an idea of what is going on.
When it 'pulses' (about 50 times a second) it ignites the gas in the combustion chamber. This sends high pressure gas shooting out of the lower nozzle. When this happens, it create an area of low pressure in the combustion chamber, sucking air in through the upper nozzle. (Can't suck air in the bottom nozzle as its on fire!) Whilst the fresh air is recieved it is partially compressed by the cone shape (similar to a ram jet). This new air combined with new fuel at the correct pressure and quantity ignites. sending more high pressure gases out the bottom nozzle. Then the whole process repeats itself again and again 50 times a second. Hope this helped.
justandy333 Are you sure or are you guessing? It appears to me that the air is alternating what side it comes in. If you have details on what this rig is I would love it if you could share them.
@GAV63 Actually, it sounds EXACTLY like a V1 rocket, because it had the same type of engine ! The V2 had an alcohol fueled rocket engine, not a pulse jet engine.
Klopt, éérste test. En op zich viel het geluid op een paar meter afstand wel mee, heel zwaar diep geluid. Maarjah hij draait alleen nog maar stationair :P volgende keer zetten we de propaan in een bak water om het bevriezen tegen te gaan, en word de gastoevoer groter.
Nikola Tesla invented an unusual kind of valve without moving parts... did anybody ever try to combine a Tesla valve with a valveless pulse jet engine? It may boost performance quite a bit!
Fuel is being pumped into the larger combustion chamber from the propane cylinder and as you can see, he uses a compressed air tank to push air into the chamber to create an ideal fuel/air ratio. I see there is a spark plug attached but it appears he is using some other flammable medium to provide the ignition source. When the fuel/air mixture is ignited the shock wave from combustion blows out each end, but because one tube is longer, and one is shorter, the flame never leaves the longer tube. After combustion and the expansion of gasses has taken place there is a vacuum created inside the combustion chamber which pulls fresh air into the combustion chamber via the shorter tube, and because the flame never left the longer tube, it gets pulled back into the combustion chamber and re-lights the fresh mixture of fuel and air. This entire process happens extremely fast, many times a second.
Troy Thomas there’s no ignition source at all. The combustion is sustained without a spark ignition. It’s literally just a steel tube and some propane gas.
I can in theory:::: a pulcejet is just an open pipe that works becouse of ITS SHAPE....... hehe Notice the kone shaped exaust pipe! as soon as the fuel explode, it blasts out the EASYEST WAY,, THE EXAUST KONE, and create vacum sucking in air at the other end, which mixes with the pressurised fuel coming from the gas tank and it explodes again in the ignitionchamber WHICH IS HOT, thats why they preheat it! It goes faster and faster, no valves,, just explosion-pressure-VACUM,,, thats why we hear B-R-R-R-R-R-R-R hehe
gezien de kleur van de motor is het de eerste keer dat jullie hem starten - en de laatste keer zonder gehoorbescherming :P voor vol vermogen, start de motor op gas en zet hem dan zo laag mogelijk. flip dan de propaantank op de kop.
@telescopereplicator My Dad was 5yo in England when the V1 was bombing them they called it a buzz bomb, I can see why now. That exhaust is red hot, is there some way of harnessing that heat and turning it into more energy?
11 years late, but for a valveless pulsejet like this, some of the thrust produced goes out the intake nozzle. If the engine were straight, this would counteract the positive thrust in the direction of motion; to prevent this, the engine is curved so that all the thrust is pointed in the positive direction, instead of just some of it.
+Teth47 during ww2 the germans had the v1 and 2 rockets that had a pulse jet engine. they shot them at england. some old person that was around during that time, hearing that noise again...lol
OK i see, but with the amount of propain there using by the frozen tank not sure the output thrust is anymore than that of a standard propain tube heater. I have seen Maddoxjets he boasts his have 250lbs thrust with reed valves.
I love the long propane hose (for safety reasons), and then leave the tank right next to the jet.
That is not only a nice but also powerful looking pulsejet! You should mount that on a bike or a canoe
Heel goed en heel mooi ! The JT8D engines on the DC-9s, MDs and B-717 we flew required so many compressor stages.
These pulsejets somehow manage to pull in (suck) enough air to keep the engine from Melting ........Dank je wel, tot ziens.
Were you able to measure thrust generated?
Extreml;y cool, congratulations on the successful test run.
its an experimental engine, was developed back in the 40s by germany, in simple terms it detonates the fuel while regular engine just burn, it was thought that it could replace jet engines and turbofans, there being no moving parts and over all simpler, but they have been phased out by ramjets scramjets and most recently the SABRE engine
a properly tuned pulsejet produces significantly more thrust than an exhaust pipe. they are less effective than a conventional jet engine but produce enough thrust to easily power a plane. In fact the V1 flying bomb weighing 5000 lbs,was powered by a pulsejet engine, which the German Luftwaffe fired around 100 per day at London in WWII
@ChineseSweatShoppe This is the first test, its just running stationairy because we didnt want to flip the tank yet. We will let it run on fluid propellant shortly.
Very cool, but you'll need to buy hearing aids after your hearing has been destroyed.
electronicsNmore. Huh?
No it's ok, I know sign language. 👍
electronicsNmore i think he use earplug
Huh??? What?????? What did you say???? Can you speak up???
WHAT??
Nah I already have AIDS from the sound, but thanks
i bet the neighborhood loves you guys!
Works very well. Please tell me how you made the pipe in a U-shape
Pavel Cherepnin welder. Dummy
Tyler Harrington that's not very nice. No need to call ppl dumb. Besides you're incorrect anyways. A welder didnt give the tube that curve lol. Most likely a mandrel bender.
Sam Sun the pipes are welded together you sensitive bitch
Tyler Harrington keep ur thoughts to urself they are irrelevant and invalid. U only made urself look foolish. Bitch.
In order to bend metal tubes like that, you need heat, and a bending tool. And for this tube, probably sand inside the tube to keep it from collapsing in on itself during the bending process.
Now, my idea was to mount one of those atop a small boat, anchored in the middle of a small private lake surrounded by homes owned by the fat cats and light the damn thin off at 3:00 am.
vanpenguin22 If I had a lake, I would.
+google user: he knows by himself. btw: did you google this knowledge?
My idea would to mount this on top of a fuselage, put on wings, then a bomb... Wait
I want to make one of these to power an acoustic resonator that converts woodgas to electricity using acoustic resonance via piezoelectrics or a diaphragm and linear alternator. . . Just wanted to pass on the idea, and any suggestions would be appreciated.
+Blitherer Masterman Potential for solid state operation, no need for excessive filtration. . . If I could damp the sound without reducing power significantly, I see no problems with such a design.
I'm studying mechanical engineering but don't understand what you said, could you please explain the function of the acoustic resonator and linear alternator?
Pulse jets are very inefficient due to their low compression ratio (at most 1.2:1). In addition your resonator would have a very short lifetime due to extreme fatigue in the materials used- this problem also affects pulse jets themselves if they are of the valved type (the valves wear out very quickly). You'd be much better off burning the gas in an 4-stroke piston engine spinning a traditional A/C generator.
If you really must use a pulse jet, be aware that the vast majority of the heat from your fuel is going straight out the exhaust of the jet without doing anything useful (I'd imagine that you would be lucky to get more than 5% thermal efficiency). You could recover more energy by using the heat coming off the jet and its exhaust to boil water and drive a steam engine than you could get from directly driving some kind of resonator or turbine, though obviously it would be best to do both.
Unless you could develop a piezoelectric converter that could also make use of heat. . . Anyway, it's an interesting train of thought, somebody could make it work somehow, I'm sure. I just like the idea of a singing crystal making electric power I guess. Even 5% conversion would be pretty good around here where there is unlimited wood that is slowly oxidizing anyway. I reckon anything to be possible. Thanks for the input.
Blitherer Masterman
Обожаю этот звук 👍
I'd love to make one of those. Stainless steel, yes? I would consider adding fins along the length on the pipe to help disperse the heat.
Tune it to about 7 Hz and it will drive people literally crazy.
I can see the spark plug not being connected to anything, so there is no spark-induced explosion, right? The motion direction of the combustion gas is directed at the beginning by the compressor. This is the valveless pulseless jet engine :)
have you tried using gasoline/petrol?
I don't know.. but is it possible to make a engine like this... but straicht forward.. I mean... no curve after the combustion chamber...
Looks like you're using propane, could you also add a little bit of compressed oxygen in with the mix and get a little bit more power?
this is a type of engine that powerd the v1 flying bomb but i think that was a Valve puls Jet engine right?
Это было круто! Первый раз вижу такой агрегат!
в тридцатые годы у немцев были планера с двумя похожими двигателями...КПД низкий .зато клапаны менять не нужно.
@@ВладимирСвиблов-р2ь где бы чертежик раздобыть?
oh i understand now, also could that mean you could use diesel as a fuel ? as it requires heat ?
If I had one of those, I'd totally put my face up to it too while it is in full operation.
If i had one
I would put a corn in to see if it turns into a popcorn cannon
can u please , explain what is in the middle of combustion chamber,injector like thing.
thickness and material of the sheet used???...pls
No ear protection? You're gonna go deaf really quick if that's the case...
+aVeryIntelligentDog - I was wondering the same thing but: maybe they had earplugs (that we couldn't see) and found they weren't enough...
Foam inserts are at least rated to reduce up to 91 dcb... Even the reusable ones I wear hunting are rated to reduce 41 dcb overall.
WHAT?WHAT?
This jet engine puts out way more than 91, 140 decibel maybe
aVeryIntelligentDog wattttttt
So a similar principle to 2 stroke exhaust chambers then?
Richard Wendt Pretty much. Only without the compression.
why is the spark plug not being used ?
Wie kompliziert ist es so ein Triebwerk zu berechnen und zu bauen?
Since it appears nothing is holding it back. It's just sittinh on tha pallot, I'd say it's creating zero thrust.
*****
An electric fan will blow the grass around some but it isn't thrust. This is actually a ramjet and a ramjet does not creat static thrust. That is, when sitting still.
Now I don't know about this one but Colin furze built a bigger one and get's around 70lb of thrust out of it, enough to get his jet bike up to 40-50 MPH
Scooter George Pulsejets aren't considered ram engines (the valveless design as showed above couldn't be a ram air engine even if it wanted to because it's air intake is facing opposite the direction of it's intended motion), they can produce 100% of their maximum thrust while stationary. The designs with reed valves have their air intake facing forward, but I'm unsure if higher speeds would equal more thrust or higher detonations per minutes as I don't have any personal experience with valved designs. Although the engineer in me REALLY wants to make one. And perform experiments. Maybe one day
Ramjets are not capable of creating static thrust.
Scooter George If it blows the grass around then surely it is creating thrust! Just maybe not a lot, but for every action there is an equal and opposite reaction. If it is able to bend 1 blade of grass, then the same amount of force required to bend the blade is also pushing the fan in the other direction. Obviously there is more to it than that, as air creates friction against other air molecules, so the grass doesn't have to move to signify thrust, but anything that is capable of blowing air out one end is producing thrust.
How much thrust do you get out of that if any?
BvEHouten is dat een bedrijf of staat het Houten stuk voor de stad houten?
What kind of thrust are you developing if u have any way to measure it?
what the sparkplug function?? seems like only accessories
Which gas is it?
how is throttle controlled? gas level increase or decrease?
What is a pulsejet used for? Stumbled on this looking at firefight videos
yea but there are other videos on youtube where there are even valved pulse jets not using a intermittent spark
how to handle the overheating problem?
if there is no valve then why does it pulse and not just be one continuous burn?
I dont get it
The same reason a horn has a tone.
The length of the horn and shape of the chamber sets up a resonance this creates a pressure wave.
Now imagine that pressure wave being a piston in a normal engine and it kinda gives you an idea of what is going on.
When it 'pulses' (about 50 times a second) it ignites the gas in the combustion chamber. This sends high pressure gas shooting out of the lower nozzle.
When this happens, it create an area of low pressure in the combustion chamber, sucking air in through the upper nozzle. (Can't suck air in the bottom nozzle as its on fire!) Whilst the fresh air is recieved it is partially compressed by the cone shape (similar to a ram jet). This new air combined with new fuel at the correct pressure and quantity ignites. sending more high pressure gases out the bottom nozzle. Then the whole process repeats itself again and again 50 times a second. Hope this helped.
ROTORS! The RC Helicopter Show
Cool That makes sense to me Thanks
justandy333 Are you sure or are you guessing? It appears to me that the air is alternating what side it comes in. If you have details on what this rig is I would love it if you could share them.
Waarom blijft die pallet liggen. Of kantelt hij niet ?
@GAV63 Actually, it sounds EXACTLY like a V1 rocket, because it had the same type of engine !
The V2 had an alcohol fueled rocket engine, not a pulse jet engine.
is this made from wolfram?
Great sound !
Klopt, éérste test. En op zich viel het geluid op een paar meter afstand wel mee, heel zwaar diep geluid. Maarjah hij draait alleen nog maar stationair :P volgende keer zetten we de propaan in een bak water om het bevriezen tegen te gaan, en word de gastoevoer groter.
doesnt get red hot does it?
Nikola Tesla invented an unusual kind of valve without moving parts...
did anybody ever try to combine a Tesla valve with a valveless pulse jet
engine? It may boost performance quite a bit!
Go4it Go4that
Yes. In fact they were tested before the reed valve type and the valveless types. However they where even less efficient
What happened to this?
can someone explain what's going on here? i dun get it
How much thrust does/did it have?
Question: Is the top part the exhaust, and the bottom the intake and combustion chamber?
Fuel is being pumped into the larger combustion chamber from the propane cylinder and as you can see, he uses a compressed air tank to push air into the chamber to create an ideal fuel/air ratio. I see there is a spark plug attached but it appears he is using some other flammable medium to provide the ignition source. When the fuel/air mixture is ignited the shock wave from combustion blows out each end, but because one tube is longer, and one is shorter, the flame never leaves the longer tube.
After combustion and the expansion of gasses has taken place there is a vacuum created inside the combustion chamber which pulls fresh air into the combustion chamber via the shorter tube, and because the flame never left the longer tube, it gets pulled back into the combustion chamber and re-lights the fresh mixture of fuel and air. This entire process happens extremely fast, many times a second.
Troy Thomas there’s no ignition source at all. The combustion is sustained without a spark ignition. It’s literally just a steel tube and some propane gas.
@@50kfpv The spark plug is to initially light the fuel.
beautiful ... will you please explain how you did away with the valve system?
I can in theory:::: a pulcejet is just an open pipe that works becouse of ITS SHAPE....... hehe
Notice the kone shaped exaust pipe! as soon as the fuel explode, it blasts out the EASYEST WAY,, THE EXAUST KONE, and create vacum sucking in air at the other end, which mixes with the pressurised fuel coming from the gas tank and it explodes again in the ignitionchamber WHICH IS HOT, thats why they preheat it!
It goes faster and faster, no valves,, just explosion-pressure-VACUM,,, thats why we hear B-R-R-R-R-R-R-R hehe
ok. this vid was uploaded over 18 months ago, made it into anything yet?
I've heard that pulse jets burn really clean. Is that true? even if you aren't using propane?
Will Flock Yes they do! I can say from experience. The smoke you see on my couple vids is my smoke system I'm working on.
You have video of explosion also?
is that a Civic's exhaust pipe!
How does this work?
gezien de kleur van de motor is het de eerste keer dat jullie hem starten - en de laatste keer zonder gehoorbescherming :P
voor vol vermogen, start de motor op gas en zet hem dan zo laag mogelijk. flip dan de propaantank op de kop.
Waar heb je t ijzer vandaan? En hoe dik is de wand vd buis?
@telescopereplicator My Dad was 5yo in England when the V1 was bombing them they called it a buzz bomb, I can see why now.
That exhaust is red hot, is there some way of harnessing that heat and turning it into more energy?
Interesting!
Well made!
Why curved and not straight?
11 years late, but for a valveless pulsejet like this, some of the thrust produced goes out the intake nozzle. If the engine were straight, this would counteract the positive thrust in the direction of motion; to prevent this, the engine is curved so that all the thrust is pointed in the positive direction, instead of just some of it.
wouldn´t it be somehow better to check the pressure and temperature coming out of the pipe with a piece of plywood instead of your hand and your face?
Please make and share "how to build one" video!
So what exactly is happening?
How much thrust?
Hello, can you tell me more about the design of this engine or any reference? Thank you.
Reference 'Pulse Jet'.
Did you put oil car in there if not it will twice of trust
why don't you use a propane torch instead of the match?
How much stress do you think it developed
I haven't built one in a long time. I used to build the kind with the reeds.
You should fire that up near an English old folks home and see what response you get...lol
+HalfLifeAMD WHAT?
+Teth47 during ww2 the germans had the v1 and 2 rockets that had a pulse jet engine. they shot them at england. some old person that was around during that time, hearing that noise again...lol
HalfLifeAMD WHAT?
+Teth47
What?
+ramairgto72 WHAT BOI?
should have measured the thrust if there was any
There most definitely is thrust. Watch Colin Furze, he powers a bike with one
I beat him to it with my engine on my go kart!
Anyone know what efficiency it is ?
wats the thrust on this one?
what about the doodle bugs? you obviously have never heard of the v1.
Is zoiets moeilijk om te bouwen?
I landscape all day. i use my hoody for ear protection too.
Looks like a V1.
Sounds like a V1.
Mi Lau that... or a tuba !
Mi Lau It looks nothing like a v1.
Mi Lau i agree albeit without the wings
*****
Yes, but a valved one, completely different compared to this.
шумовой эффект хороший, но какое у неё назначение ??
Like the V1 and V2?
only V1. "Staustrahltriebwerk"
Ramjet engine
how fast can this cook a hotdog?
Mmmm, Smores.
So much effort put into the technical stuff, yet no hearing protection? :-o
She runs a bit warm?
thrust?
On a pallet ?
OK i see, but with the amount of propain there using by the frozen tank not sure the output thrust is anymore than that of a standard propain tube heater. I have seen Maddoxjets he boasts his have 250lbs thrust with reed valves.
Know about simple hole and place spark plug in it
can I use it together with my bicycle?
I bet you were popular with the neighbours! Good Work.
Just like the v1 missile
No, this one is valveless, the V1 ones valved.
Bet your neighbours just love you ... :o) seriously though, a very fine project.
Is dat in houten ???
Look up the German V1 . They used a version of the pulse jet during WW2 and they used them to attack England.
@ChineseSweatShoppe haha well i just think this model doesn't cut the edge...It's super to see it glow red hot don't get me wrong.
What power produce this engine?
Spark plug for what?
give me the Build Plan pls
Can I buy one?
Germany was testing in ww2 or had it
i thought all pulse jets has some kind of a valve.... usually some sort of a reed valve. Otherwise, it would just be a ram jet .
Ate they really that loud
+Hatsune miku 01 - No, actually they're even louder than the video suggests.
Are they😆