Its to do with the uneven lengths of the pipe in relation to the position of the combustion chamber. The explosion accelerates in both direction out of the combustion chamber and by the time the chamber is a vacuum and sucking in more air the explosion on the exhaust side is only about half way round the pipe The inlet side is very short so the explosion almost fire straight out the pipe
I saw the fuel line came straight away from the combustion chamber. How about running it parallel to the chamber for a short distance to pick up heat so you boil the liquid propane?
@@GT380man if you werent so set on trying to be the smartest person in the room you would realise he means its powerful for how simple of a design it is... no one said it was gonna take us to mars bud...
Hey, I know your comment is 4 years old but I'm still gonna reply. So there's really 4 notably different valveless PJEs: Thermojet, Chinese, Linear and Lockwood. Each of them have their own ups and downs. Thermojets and linear are the easiest to build, but can be tempremental, and linear also has the intake pointing forwards so you lose some thrust. Chinese are easier to get going but slightly harder to build because of their angled intake(s). Lockwoods are arguably the most reliable but usually need to be much bigger to be effective.
Well, interesting experiment.. but what are your conclusions? what did you learn and what (other then putting a tube fuel extractor in) are you going to do to increase the efficiency of this pipe motor? enjoyed the video but it lacked result's to me.. But what do I know.. I just work with wood and a bit of electronics (very little bit)
@@imagineaworld I went over to Colin Furze and the short side w/ the combustion chamber is the exhaust and the long side is a tuned intake. I don't know about the numbers either, but the V1, they say, was pulsing at about 50 per second and it sure didn't sound anything like that. I expected 50 per sec to sound higher.
hi guys, nice video! could you try to tell me why our pulsejet does not work? its in my channel. is the exhast to short? or is the flow of air to high? or does it need another intake? we appriciate all feedback :)
You are describing a phenomenon called flashback, and it can be incredibly dangerous. A device called a regulator controls how much gas can flow out of the tank at any given time and there is a little rubber seal inside a regulator like the one I'm sure they used on the fuel tank that only allows fuel flow in one direction (away from the tank). even with this rubber diaphragm inside the regulator there should be a device called a flashback arrestor installed between the fuel line and the regulator that will keep any flashback from ever reaching the tank and exploding.
I could be wrong but I don't think water injection would help a lot because its not getting compressed with a piston in a combustion' chamber......well not a actual combination chamber anyway....I could be wrong....
atomised fuel delivery system will prevent flooding; try adding an acustic ossolation system to increase the pulsation rate. that will improve flow and will multiply the thrust. also research the tesla valve; this will reduce back flow via resistence, all of the aforementioned will improve your pulse jet ten fold. also where are you guys based I'd be interested to link up with you and exchange knowledge & ideas.. ??
Before they started, I thought, how many things could go wrong? No hot work permit, no fire extinguisher, no fire retardant clothing (PPE). The fuel cylinder was a little too close to the jet for me. Inside a garage???? Are you kidding me?? The brush pile was a tad close. Aiming exhaust at the road ant half throttle?? Not secured to the floor?All in all, it was a hoot, rock on.
That's some serious entertainment... on video, not next door! That crazy old guy "Doc" next door is gonna strap that thing to his DeLorean and who knows where he'll end up? Marty, watch out, this old guy here says he wants to talk with you...
Nice job from across the Pond guys, so to figure out how much thrust you need is simple addition would it be, figure out all your weight including parts LOL, this is the way to your fuselage and payload equals thrust
Why does it look like all the high-speed exhaust is coming from what they called the intake? The exhaust end looks like smoke is being dragged in. Do these guys really understand how these things work? Check out Colin Furze.
Expirementation is the basis of knowledge. Pretty soon the will realize the long leg of the engine is the inlet valve for the short leg exhaust. Maybe they will anyway.
@@gregwarner3753 Yes, I'm sure, but in another video, I saw, the thing was lit form the same end and was running the other way. The long end was the intake. Interesting that these things can be made to run in either direction. Not the same engine, but one with slightly different dimensions can run in the opposite direction. If I find the link, I'll send it to you.
Express Travel bus has ordered one unit !, it's a great way to test vertical wind turbine generator, good job you ordered fireproof garage door from Amazon, I have seen the Chinese use a jet to clear ice from the roads, I guess your out in the countryside:)
yes a good right shaped pulcejet is very effectice if mounted on a moving objekt-plane, there air is pressd in to the air intake,, compared to a testrun.. mounted in a garage where it have to suck the air mixd with exaust in again itself
@@cambridgemart2075 How could they be working on this thing and not know which is which? Are they running it backward? I just read the article on Wikipedia and I'm not clear on what's what. I should look at an animation.
@@cambridgemart2075 All the Lockwood-Hiller pulse jets run that way and all the diagrams and animations say they're supposed to run the other way. I don't think anyone really knows how they're supposed to run. Or else the long tube is carrying too much air mass and causing the thing to run in reverse. There's every possibility that these things were built incorrectly.
@@cambridgemart2075 God, I think I have dyslexia. I read your comment inside out. I see that you are in agreement with K9T, but he is saying that the long pipe w/ no chamber is the exhaust. Clearly, the other pipe is doing something. I have an animation here. ruclips.net/video/55JoyhDwggU/видео.html See what you think.
10:03 I do Believe billiard ball has pulse jet for an Arse or he's blown a gasket in his ringpiece needs a rebore and the other guy just stands there and gets a lung full BB exhaust emissions
Nitrous oxide is non flammable.... Wouldn't do any good unless it has a piston compressing it in a cylinder..... but nitromethane on the other hand....boom!
05:00 I think you nearly put the school bus into the ditch. I would bet that's the loudest thing you ever had in the garage (the jet). Would have been over 120dB so off the scale?
Hey hey...I knew this one guy from technical school who built one of these for his bike (pedal kind) and got stopped by the police going down the road. They told him it was too loud, that's why he couldn't drive it on the public street. Btw this guy from the story lives in Central Florida.
I love how you give numerical output for the thrust but give non-empirical results for noise.
"Looking back, it was the point when it broke free of its moorings and flew off dragging the gas bottle behind it that things started to go wrong."
It was at this moment, he knew, he fucked up.
No it is when it did all that and flew to london that you know it went wrong.
Polystyrene ceiling.
Liquid propane.
Pulse jet.
What could possibly go wrong?
Hey, these are rocket scientists at work. :)
This should make a good heater for the home.
Ha ha. Your neighbours must love you!
Could be worse!!! They could have harleys!!! 😎😎😎
I just love these pulsejets the noise is very comforting for me
4:59 Lucky escape for minibus!
Clipboard, garage, flammable materials. All the ingredients of a good scientific video.
Amazing.Very informative….. i hope u upload more. Not only for just a video but for study purpose also
This is like an episode of Wallace & Gromet.
Or the Secret Life of Machines.
lol
They talk funny innit !
Its to do with the uneven lengths of the pipe in relation to the position of the combustion chamber. The explosion accelerates in both direction out of the combustion chamber and by the time the chamber is a vacuum and sucking in more air the explosion on the exhaust side is only about half way round the pipe The inlet side is very short so the explosion almost fire straight out the pipe
I saw the fuel line came straight away from the combustion chamber. How about running it parallel to the chamber for a short distance to pick up heat so you boil the liquid propane?
Would have loved to see the people's faces in that bus if this was running full power when they drove by 😂
Humans: magnificent feats of aircraft engineering
Me: Fart Rocket
You; ass.
My fear of severe burns will keep me from trying this but great video 11 minutes well spent
Unexpected to see the blue flame coming out of the _inlet_ !
Incredible engines these, so simple yet so powerful.
I don’t think 15 kilos of thrust is powerful,
@@GT380man if you werent so set on trying to be the smartest person in the room you would realise he means its powerful for how simple of a design it is... no one said it was gonna take us to mars bud...
They start to panic when it cuts out. They think a V1 is about to land on there head
Do you know what is the best design for valveless pulsejet engines?
Hey, I know your comment is 4 years old but I'm still gonna reply. So there's really 4 notably different valveless PJEs: Thermojet, Chinese, Linear and Lockwood. Each of them have their own ups and downs. Thermojets and linear are the easiest to build, but can be tempremental, and linear also has the intake pointing forwards so you lose some thrust. Chinese are easier to get going but slightly harder to build because of their angled intake(s). Lockwoods are arguably the most reliable but usually need to be much bigger to be effective.
@@JakandDaxterAddict your reply was helpful for me! thanks
Love the video one question did you guys build that from blueprints if so where did you get them?
Well, interesting experiment.. but what are your conclusions? what did you learn and what (other then putting a tube fuel extractor in) are you going to do to increase the efficiency of this pipe motor? enjoyed the video but it lacked result's to me.. But what do I know.. I just work with wood and a bit of electronics (very little bit)
Im skeptical that the side with the 2 foot flame is the intake. Is that correct ?
Its supposed to be... but it sure is not here..
I agree. And is that thrust typical? Seems extremely low.
I actually verified, that is the exhaust, the tapered intake acts as an intake "ram" apparently. Not sure about the thrust numbers
@@imagineaworld I went over to Colin Furze and the short side w/ the combustion chamber is the exhaust and the long side is a tuned intake. I don't know about the numbers either, but the V1, they say, was pulsing at about 50 per second and it sure didn't sound anything like that. I expected 50 per sec to sound higher.
A buzz bomb. You guys are nutz, wish I was there cause I'm that kind of nutz too. Lovely
Yes darling theyre bloody genius!😃
That intro is by far one of the most horrifying things I've ever seen
Best gas to noise product. Love it
How many lbs of thrust have it?
JedaElectronic they said 50 lbs.
Which side produces thrust? The side with the flames coming out?
Man that is wicked good Job boys 👍🏽😉
hi guys, nice video!
could you try to tell me why our pulsejet does not work? its in my channel.
is the exhast to short? or is the flow of air to high? or does it need another intake? we appriciate all feedback :)
Did you get any numbers for the dB at all? Or just a series of Verbs?
30 second intro of robot dog with electric balls
What keeps the explosions from causing the fuel to burn in the supply line and back to the fuel container? Is there any chance of this happening?
You are describing a phenomenon called flashback, and it can be incredibly dangerous. A device called a regulator controls how much gas can flow out of the tank at any given time and there is a little rubber seal inside a regulator like the one I'm sure they used on the fuel tank that only allows fuel flow in one direction (away from the tank). even with this rubber diaphragm inside the regulator there should be a device called a flashback arrestor installed between the fuel line and the regulator that will keep any flashback from ever reaching the tank and exploding.
You guys are frikkin brilliant! Fantastic video!
Awesome show guys very informative matter fact I loved it, including comic relief, any thoughts of us methane power Pulse Jet?
Have you guys ever considered water injection to increase the mass flow, and use some of the excess heat to generate more thrust?
I could be wrong but I don't think water injection would help a lot because its not getting compressed with a piston in a combustion' chamber......well not a actual combination chamber anyway....I could be wrong....
Louder that that? Priceless.
There are easier ways to set fire to a garage! Why am I thinking of Laurel & Hardy?
They were the smart ones..... ;^)
Monty python meets pulse jets ....Please carry on this is F#####g awesome !
atomised fuel delivery system will prevent flooding; try adding an acustic ossolation system to increase the pulsation rate. that will improve flow and will multiply the thrust. also research the tesla valve; this will reduce back flow via resistence, all of the aforementioned will improve your pulse jet ten fold. also where are you guys based I'd be interested to link up with you and exchange knowledge & ideas.. ??
Before they started, I thought, how many things could go wrong? No hot work permit, no fire extinguisher, no fire retardant clothing (PPE). The fuel cylinder was a little too close to the jet for me. Inside a garage???? Are you kidding me?? The brush pile was a tad close. Aiming exhaust at the road ant half throttle?? Not secured to the floor?All in all, it was a hoot, rock on.
That's some serious entertainment... on video, not next door! That crazy old guy "Doc" next door is gonna strap that thing to his DeLorean and who knows where he'll end up? Marty, watch out, this old guy here says he wants to talk with you...
What a Debby downer you are.
I bet you're scared of leaving your house.
very nice pulsejet
So charmingly awkwardly British. Loved it! :)
Hello. Is that running backwards?
Someone has reinvented the buzzbomb.
Nice job from across the Pond guys, so to figure out how much thrust you need is simple addition would it be, figure out all your weight including parts LOL, this is the way to your fuselage and payload equals thrust
K9 Testis ............ Instant thumbs up :)
so did you ever get around to making the changes to the fuel delivery system?
Holy S*+_ Imagine a Tesla Turbine on the end of that!
You are a couple of very eccentric dudes.
That pulse jet was probably 145 or maybe 150 dB at 1 meter at full power and could be hard 30 km away in open areas.
I would say you need to cut part of the exhaust pipe and make it into more of a cone that should prevent the flooding
Very weird channel I love it
good job, and nice intro,,,,,
how big could you make one of these?
wonder how many decibels this is
Actual noise level reading?
Do you have a video on building it,
How about acetylene?
Why does it look like all the high-speed exhaust is coming from what they called the intake? The exhaust end looks like smoke is being dragged in. Do these guys really understand how these things work?
Check out Colin Furze.
He said it backwards, no reason to be such an ass, where is your handmade pulse jet?
Expirementation is the basis of knowledge. Pretty soon the will realize the long leg of the engine is the inlet valve for the short leg exhaust. Maybe they will anyway.
@@gregwarner3753 Yes, I'm sure, but in another video, I saw, the thing was lit form the same end and was running the other way. The long end was the intake. Interesting that these things can be made to run in either direction. Not the same engine, but one with slightly different dimensions can run in the opposite direction. If I find the link, I'll send it to you.
Thats great info, many thanks. You are getting good thrust figures.
And then granny woke up screaming...buzz bomb, take cover!!!
He almost lifted off at the end. Must have produced 180 lbs of thrust. Perhaps a propane enema.
Imagine being their neighbors
Daya dorong berapa kg?
Express Travel bus has ordered one unit !, it's a great way to test vertical wind turbine generator, good job you ordered fireproof garage door from Amazon, I have seen the Chinese use a jet to clear ice from the roads, I guess your out in the countryside:)
This should be on some type of aircraft. I'm thinking, something like a V1 with a cockpit instead of a warhead
yes a good right shaped pulcejet is very effectice if mounted on a moving objekt-plane, there air is pressd in to the air intake,, compared to a testrun.. mounted in a garage where it have to suck the air mixd with exaust in again itself
Aim the exhaust at that nice big brush pile next. Huge Bic lighter!
One must remember to play with your combustible toys out doors....
That’s insane.
@ 4:58.... "CAR!" @ 5:01......."Game on!"
It runs backwards as to your explanation.
4:44. . . Oh. . He has a clipboard??
OK!. . .
It's all safe, legitimate and scientific then!!
My goodness, at first I thought it was loud, then u mentioned going to full throttle.... I could see everything shaking
Great!
I wish you guys were my neighbours.
Errr.....
Well in my neighbourhood.... :-0
I believe you said the intake and exhaust backwards.
Look at which part heats up first, it's the long branch so that's the exhaust.
@@cambridgemart2075 How could they be working on this thing and not know which is which? Are they running it backward? I just read the article on Wikipedia and I'm not clear on what's what. I should look at an animation.
@@cambridgemart2075 All the Lockwood-Hiller pulse jets run that way and all the diagrams and animations say they're supposed to run the other way. I don't think anyone really knows how they're supposed to run. Or else the long tube is carrying too much air mass and causing the thing to run in reverse. There's every possibility that these things were built incorrectly.
@@alext8828 Was that supposed to be addressed to Uncle Schickelgrubber? I'm in agreement with K9T.
@@cambridgemart2075 God, I think I have dyslexia. I read your comment inside out.
I see that you are in agreement with K9T, but he is saying that the long pipe w/ no chamber is the exhaust. Clearly, the other pipe is doing something. I have an animation here. ruclips.net/video/55JoyhDwggU/видео.html See what you think.
10:03 I do Believe billiard ball has pulse jet for an Arse or he's blown a gasket in his ringpiece needs a rebore and the other guy just stands there and gets a lung full BB exhaust emissions
It was about 125db. Are meter doesn't go much higher
What if we added NOS to it
Nitrous oxide is non flammable.... Wouldn't do any good unless it has a piston compressing it in a cylinder..... but nitromethane on the other hand....boom!
Kind of like expansion chamber on a 2 stroke engine
you have the exhaust and intake backwards.
I was about to say that
I NOTICE MYSELF.... THIS IS A TUNING PROBLEM..... LENGH OF EXAUST IS NOT TUNE PROPERLY
05:00 I think you nearly put the school bus into the ditch. I would bet that's the loudest thing you ever had in the garage (the jet). Would have been over 120dB so off the scale?
😁 I wonder when they will be let out of the looney bin. Years since a video.
You didn't mention your quiff
excellent
hello, i built a similar engine and its hard to start it
I guess it would be pointless to put a nice paint job on that?
can i please establish contact with you as we are dealing on a project the same way but youve got more resources experience on this than us
V1 über alles
If nothing else, you have uncovered an off season use for a leaf blower.
thats a big leaf blower
This must be the Florida part of England
Hey hey...I knew this one guy from technical school who built one of these for his bike (pedal kind) and got stopped by the police going down the road. They told him it was too loud, that's why he couldn't drive it on the public street. Btw this guy from the story lives in Central Florida.
I would day its probably like an internal combustion engine, in that its gets more efficient when it gets hot.
Nice, man.
Pulse jet plans
That would be nice for sure
If someone knows please let us know
just the kind of neightbor everybody hates.
fart loud , not bad
Anyone seen seen the fire extinguisher? Never mind, here's a leaf blower.
V1 that’s all I’m going to say
nothing like a V1, this is just like a venturi, no moving parts, an 8 year old could make this
The V1 (Argus Intermittent Propulsive Duct) engine had valves, as everyone knows.
Serious health risk turning liquified gas bottles upside down 🤔
Armando Silvier : yes it’s a go a Big Bang and a Bigga flames 🔥 whoosh!