This is by far the most technically competent and entertaining video on UA-cam (this coming from an aerospace engineer). Keep this level of content up! Absolutely fantastic.
I love how he cracks the biggest smile before lighting the jet hahah he comes across so serious in all the videos until it's time for pyrotechnics then he gets so excited and elated ! Great videos I love watching all of them
For those that have not been following this guy, he has an amazing workshop. That and the high level of material he is conveying - from flat-panel speaker design & use, to audiophile (standard) speaker build-outs and non-phase-change air conditioning made me initially think he was doing this all at a university somewhere. Nope! This is his home! A previous video had him state that his wife came down about the noise, as did a neighbor that he would later have to go over to and apologize to (It was night time). This guy LOVES what he does, and is absolutely great at it. As I have told my contacts privately, if I had this guy as an instructor when in collage I would be in a different place now.
I checked his videos to see the air conditioner one and then realized that this is the "same guy from that interesting AC invention I saw a couple months ago". Very cool stuff, subscribed.
If anyone is having trouble hearing the narration at the end, try headphones, the vocals are primarily from the right channel and the jet from the left.
Yes that sucked!! You go through most of the video on the edge of your seat with high interest/anticipation and everything goes to shit at the end... Not even a mention of the kind of thrust he was getting out of this... 50 lashes with a wet noodle!!! Pffft...
6 років тому+4
Really, you shouldn't have to wear headphones or use surround sound to get the best experience. In the future, bringing the background down a bit would be appreciated by me, at least.
I have never seen a more intriguing and magnetic personality on UA-cam. Take all the suggestions you want but remember it's you and what you do that makes this channel so great.
For proof of concept, you should show the thrust of the electric fan running solo in the engine, and then with fuel with the fan running at the same wattage. This type of data will help propel your channel to the next level.
Drone Voyage ... YESSS!!! It would also be interesting to stack a couple of fans in counter-rotation in the duct increasing compression and velocity etc.. The end of this was a let down of an otherwise interesting concept.
The JP Hobby 90mm edf makes around 9.5lbs of thrust at 6s/125A, if this is the 12s version, it's making 13.4lbs at 117A. They're going to need a much larger force gage if they're going to measure the output. It also doesn't sound like they're turning the edf up to 100% power when the force gage is maxxed out, so they're certainly getting added thrust from the afterburner.
I wanna see it scaled up to use a lawnmower engine to turn the fan maybe see some cooling the jet with the fuel to keep the integrity of the structure and set up the hydrocarbons for combustion by getting them excited to meet oxygen to make a hot carbon and water vapor babies
These videos make me so jealous. There is a zero percent chance I will ever have the time, energy, or funds to enjoy scientific creativity firsthand like this. You have such a special thing here. Please, don't ever let it slip out of your grasp.
Thanks for taking the time and effort to produce a video with clear explanations that help non-experts understand how jet engines work. Much appreciated!
For anyone interested there are papers available on the internet written by Frank Whittle going through the full build process of his first engines, including the materials used for the turbine (Forth Rex 78 stainless, used in kitchen knives) and his issues with burners and so on. Frank patented (Edit:2nd patent)the jet 'afterburner/reheat (and turbofan engine) in 193? which he used for his supersonic engine design to go in the Miles aircraft.
I own an engineering firm, and work with subcontracted firms for some projects. Some of the technologies I've invented, I spend weeks trying to get engineers up to speed. I would love to have your skill at breaking down fundamental principles and effects. You sir, are an extraordinary teacher. I love your channel.
Now UA-cam? Now?... The whole time I've been living without this video, and I've been wondering lost without my own jet engine..... Why now do you recommend this awesome video.
This is a true tech channel. Many varied interests, concise explanations, suburb audiovisual. It feels like I'm in an engineering lecture watching this channel please look into getting a patreon account
Extremely well done sir! The way you explained things in 15 minutes allowed me to mentally connect many dots I've had floating in my head over the years in regard to the principles of how a turbojet engine works. Very much looking forward to the next portions of this series! :-)
*GOD* Bless you.. I was working for my project pulse jet engine and searching so many content in last 3 days, pulse jet is quite good but it gets really hot and not good for or ideal aircraft output using as a engine. so I was searching for another solution for engine that is cheap safe, easy to use and low cost fuel and maintenance so I found out that p300 small jet engine that use fuel and quiet expensive but durability and maintenance better than pulse engine jet. Now you have give me a solution electric ducted fan and I have search in the internet it has quite good lb. Very much safe and easy to use recyclable. *I* like the way you talk and Teach. Very Easy to understand (who is from 3rd world) Best *UA-cam* CHANNEL I HAVE FOUND.
Thank you very much for finally clearing up my confusion about the paradox of the standard jet engine. The combustion chamber increases the volume! (not the pressure) From that I see the equation of pressure diff times volume equals work, which means that the turbine produces far more work than used by the compressor, thus leaving excess for other work.
Yes, that is a very interesting idea. Our plan with the second fan is to introduce a water/alcohol mix between the stages to reduce the temperature rise associated with compression as is done with an inter-cooler and increase the air density. Note: don't choose methanol.
Actually, less explosive, but too powerful a solvent effect for the motors. The liquid will pass both around and THROUGH the motor providing direct cooling to the winding.
Unlikely, as (so far as I can tell) the water is going to be aspirated into the air stream between the compressors. However, it won't be wasted - the more mass you can throw out of the back of this kind of engine, the more thrust you will get.
This is a wonderful video. There's not many experimenters around anymore where it is worth the time to listen to their explanations, let alone quantify their results like you do. I would like to point out that on full size jet engines, the start up procedure is to first set the turbine rotating to a set speed with the starter (pneumatic or electric), trigger the igniter, then introduce fuel. This is done to decrease the risk of liquid fuel pooling and causing what is called a hot start, which can damage the combustion chamber. You sidestepped this by using propane, but it's helpful to know for future experimentation.
Wow. You really know what you are talking about. And more importantly for someone making and sharing videos, you know how to explain things well. Most people cannot do the latter. I am looking forward to more on this from you. Thank you!
the name of this type of jet is a "motor jet". there were a handful of modestly successful examples in the first half of the twentieth century with gasoline-engine front ends. ultimately the weight efficiency of driving the compressor with a turbine was well worth the substantial development difficulty
Joseph F it's the difference between low tech and high tech. you can't beat the efficiency of driving the compressor with a turbine, since you already have the hot gas supply. but if you can't afford the tech you use a motor, and the advantage of electric is that it's silent and nowadays off-the-shelf
Great explanation! That's exactly what i missed in many books and videos, that the pressure inside the combustion chamber and turbine does not increase but decrease! But the reason, how there is generated the power for the whole axel is the much higher cross-section-area but with a slightly lower pressure.
Your camera work has improved a lot. Multi camera setups increase the, uhh, let's call it effort, at a rate that scale as a square of the number of cameras; whereas the added value to the viewer only increases at a rate that scales as a multiple of 2 to the number of cameras. So, that should be in a language you guys understand. The switching of the cameras, and especially the overhead camera, during exposition is really quite distracting. TV does that to keep the viewer interested and not bore them. But, your viewers don't need that and when you are explaining something non-trivial to understand it ends up subtracting rather than adding. I was a producer and before that a camera operator for many years, so if you ever have any questions I'd be happy to help. I really, really love what you guys are doing. With the dumbing down of most media it's really essential that people keep making stuff like this. Being a polymath went out of fashion in mainstream culture but never lost its appeal for some of us. So, coming to your channel one day to learn about jet engines, or rocket engines and then coming back another day to learn about distilling banana liquor the next day, well, there really is no other place I can do that. So, don't worry too much about interesting camera set-up so much. Just keep the view stable, keep it in focus, make sure your sound is really good and just point the camera at Mr. Wizard there and le it rip. Your audience care far more about esoteric content than they do about camera set-up. Of course, you've improved by leaps and bounds in the intervening two years, so my critique isn't exactly germane anymore. Take from it what you can... And thank you, so much, for making knowledge cool. I detest the culture of being proud of ignorance so much. I imagine you do too.
And I was waiting with a pen and a paper to write down the instructions ..but I am really very impressed the way you described what's actually going on inside .. thank sir will wait for your next video
Cool project! You definately know how you keep me interested and wanting more :) I really enjoy the more elaborate explanation (compared to other tech youtubers), definately an example I want to follow!
I am looking to find a good toturial on how to build a rc jet engine and I saw your video. I have seen many of your video's and I love the way you teach people something. For me you are the best and it is easy to understand you. And I had smile on my face and happy until you changed into the pulse engine....:(
You are awesome dude. Probably start with a wider engine body... Larger input compressor fan... Neck it down significantly and you will have a much different performance... Yours looks like a ram jet at the end of the video. It's spectacular to watch. Starting off with more volume of air allows for greater compression potential. Potentially more efficient in an engine such as this... The hybrid idea is absolutely genius. Will have less internal drag without turbine blades.
I'm an "ex-T56-7/15 turbo prop tech", had always been interested in the easier/simpler engines such as the Ram, Pulse, and motor-jet engine (which you made). Your motor-jet is probably the best on YT (and I've seen quite a few of them, some of them are Almost as good as yours and some are just crappy "jokes"). any how good job :-)
Excellent explanation. Thank-you for setting the record straight. Unfortunately, on an iPad, your audio is only about Q2 or Q3 when the jet power is increased.
This is truly is the best channel I've found in a very long while, it's very professional and well made educational content which is super interesting! Never stop!
Really great job explaining the operation of a jet engine in an easy to understand video. I am looking forward to the upcoming videos, especially liquid fuelling and more thrust! Big thumbs up. Thankyou!
Wow! Some gears started slowly turning in my head! But I can't say that I really understand how jet engines work. Could you please discuss it in a future video and breakdown pressure gradients, velocity, volume, and the force that in the end provides the thrust (maybe on a chalkboard/piece of paper). Maybe compare how the engine you have built works to those we find on commercial airplanes. to the Many other videos on UA-cam are simplifications that are not very helpful and sometimes misleading. Hopefully there are more viewers out there that would be interested! As always, your content is truly incredible!
A very good explanation of your hybrid jet engine. Try using vaporised methanol at the front of the first ducted motor then watch how much power you get out of it.
Pragmatic speech blows me away every time. I didn't hear a thing you said, I was that impressed. I will have to watch later to see if you have left anything out, but I don't like my chances. Thanks, Thumbs up, subscribed.
ok...this channel is very awesome,but...we have see turbojet,rocket and hybrid jet, i think is time for air-turbo rocket!! Seriously it is really the best channel on the topic that exists on youtube.
Excellent video, gives solid understanding of how turbine gas generators work.. Heat does the work as they produce high volume high velocity gas flow..essentially they use fuel to expand air to create acceleration of mass/volume, some of which is tapped to pump a lot more air into the system, so that net expanded volume & velocity are compounded..the afterburner adds more fuel and thereby MORE heat beyond the core of the engine, so that even more velocity is created..resulting in compounded thrust.. steps of acceleration as air is primarily then secondarily expanded.. oh such a beautiful thing😁 Imagine the steepness of a slide.. if you imagine the shallow gradient, you slide down slowly..if you add gradient so its steeper, the faster you slide down..so the greater the difference in gradient, the more kinetic energy is realized.. the idea is to create the highest pressure gradient through the system& extract the greatest gradient in BTU, efficiently turning BTU into EXPANSION rather than increased temperature .. Latest technologies allow higher temperatures & thereby utilization of the greater efficiency of the more extreme expansion .. more heat added to a heat engine, more work done.. so long as materials can handle it!😄
So then when you introduce the second stage fan and get more compression, you will have lower temperatures due to the greater air mass moving in? Or are you going to put in even more fuel to keep the high temps? Is the steel holding up? Is that plain 304 stainless? or something more exotic like high temp inconel?
It's 304 stainless and there is some erosion and deformation near the junction with the nozzle strips. The second fan increases the compression ratio and even if no additional heat energy is added there will be more thrust as well as more efficient use of the same heat in converting thermal energy into exhaust, kinetic energy. Nevertheless, additional mass will also flow and so some additional fuel can be added as well.
What a wonderful jet engine...so well constructed and thought out. Was there a cooling annulus provided at the combustion stage onward to keep the interior cool?
It would. The advantage of propane is the higher energy density and easy compressibility of the hydrocarbon fuel. Hydrogen has a huge amount of energy/gm, but much less per cc.
@@TechIngredientsthx for the reply, but i mean HHO has already Oxygen in it , so it needs less to no mixing and turbulance behind the fans (i would guess).
Very similar to something I'm working on. I got the idea to try something like this about 5 years ago while I was sitting in a jet propulsion class, but until now I've just been a cash poor mechanical engineering student. To be honest its kind of depressing to see someone else demonstrating an idea so similar to my own, but I guess the fact that it seems to be viable for you is heartening.
This idea is not so profound that you missed your shot. There have been some early attempts to do this on UA-cam. The trick is dealing with the low compression ratios available from electric fans/compressors. This is why electrically driven turbochargers have failed to compete in the automotive area. With version 2.0 we have achieved an augmentation ratio of 2.3 which is close to the theoretical limit of 2.6. Where this gets interesting is when ram pressure is added. Typical turbojets only see a significant effect from ram pressure at relatively high flight speeds. Also, the benefit of turbo inter cooling may have some application to subsonic ram jets.
Would it be more beneficial for the second stage compressor to be contra-rotating with the first or would it be better for them to spin the same direction?
Thank you for your video, the way you are explaining the topic and the vocabulary you are using makes it very interesting to watch. There's lot of valuable informations.
To my knowledge I don't recall ever hearing of any motorjet that has a particularly worthwhile power increase due to it's afterburner? And I have looked long and hard and tried myself. Does the concept actually even really work? I really want it to! I really hope that your efforts pay off. You are one of the few people I'd trust to prove if it's possible. Thank you for what you do and share with us all. Has anybody seen a motorjet that has a worthwhile power increase please?
When you say motorjet, I assume you mean an electric ducted fan. In our most recent tests with the newer, two stage jet we see more than a doubling of the thrust compared with the fans alone. The fuel use is stagering and the flame and fury is frightful. Beautiful! An easy way to visualize what is happening without resorting to a lot of mathematics is to slowly approach the exhaust end of a running fan with an obstruction, the thrust increases substantially. The increase in volume of the exhaust within the combustion chamber requires an acceleration and this acts to increase the back pressure for the fans. We'll show this engine shortly.
There is already a significant amount of swirl in the air coming out of the fan. Better mixing of the fuel is always good and the presence of rows of unaligned strips in the fuel / air flow helps a lot. The nice thing about the strips is that you can continue to add additional strips until a good burn has completed, but not any more in order to avoid additional flow restriction.
If this were mounted on a vehicle, What if any, influence would the addition of forced air through the front have on fuel mixture? Would it be more efficient or use even more fuel? Thanks!
is the reason you're not getting shock diamonds because the pressure in the thrust isnt lower than the atmosphere or because the flame is too turbulent?
The primarily reason is that we do not have sufficient pressure in the throat to overcome the turbulence and allow the shock diamonds to be clearly seen. You are correct that they are the result of supersonic flow into the surrounding atmosphere.
Would ducting air around the latter stages of the engine to keep the stainless steel tube below melting temperature allow for higher combustion temperatures in the latter stages or for higher mass flow of combustion gases without needing to increase the cross sectional area of the engine? Could it also allow for using lower melting point materials that are lighter in that area?
Yes!! The next upgrade will incorporate a second stage fan as I described in the video, but we're toying with leapfrogging with the addition of a third, larger diameter bypass fan feeding these two stages as well as cooling the stainless tube and allowing higher flame temperatures as well.
It is pretty interesting that you can do this with stainless steel instead of titanium. With the access to the high temperature and the constant stream of cooling air from the third or access to fresh outside air cooling, would a thermopile be able to generate significant energy? Since we are looking at a temperature difference of hundreds of degrees K, is why I ask.
Tech Ingredients ... Great!! Looking forward to the second fan in counter-rotation.:) you may want to consider an increase in number of blades in second fan and higher output/RPM... I would also use direct drive out-runner type motors for this... Although that may require some modification to off the shelf items. But you seem quite resourceful... HA! :)
Would a centrifugal fan create higher static pressure for the same size as an axial fan? if memory serves me the first jet engines used centrifugal compressors.
Yes! And believe it or not folks! He makes rocket engines too! I can't wait until he builds an interstellar propulsion device! Great video as usual! Peace
"Pulsejets tend to be very loud." Loud doesn't even begin to describe loudness the produce. Think along the lines of a high power rifle shooting 50-100 rounds per second.
"They aren'tloud once you have heard one.." ". . . . W H A T . . . ?" 🤣 Yes, supersonic flow.. very obnoxious sound.. good cause of hearing loss.. but did you ever see one of those cherry red hot rockets fly? 🤯😮😃😂😉👍
You know in Breaking Bad, that scene where Jessie tries heroine for the first time? That's basically me whenever a new TechIngredients video is released.
Its outputting more thrust because the same mass of air, moving through the fan, has expanded due to the added heat. This causes that same mass of air to accelerate down the tailpipe and reach a higher final velocity.
Could you show us more pictures from the inside and the assembeling. As a german with a low degree in English it's sometimes hard to follow your descriptions. And thanks to you and your team, you are awesome!
Finally! Someone who actually understand whats going on inside a jet engine and has the ability to articulate it correctly!
Thanks!
If you want to learn about gas turbine engines, check out AgentJayZ youtube channel
We have watched many of his videos, they are interesting and well made.
@@TechIngredients any updates?
True. But explaining these concepts while showing the P-V & T-s themodynamic relationships will make the concept clearer. Good job though.
This is by far the most technically competent and entertaining video on UA-cam (this coming from an aerospace engineer). Keep this level of content up! Absolutely fantastic.
HE'S PATEY-GRADE!
I remember that one tuber who did all kinds of weird dangerous things then just like Steve Irwin ..... died.
My God where did this guy come from ...I went from watching fiberglass to speakers and now jet engines This man is smart
"THE MAN FROM THE UNIVERSITY..."
(my guess he has Tenure)
I love how he cracks the biggest smile before lighting the jet hahah he comes across so serious in all the videos until it's time for pyrotechnics then he gets so excited and elated ! Great videos I love watching all of them
yeah I get that vibe of "turns off camera then BU HUU HAA HAA!!!" then back to "Normal"
For those that have not been following this guy, he has an amazing workshop. That and the high level of material he is conveying - from flat-panel speaker design & use, to audiophile (standard) speaker build-outs and non-phase-change air conditioning made me initially think he was doing this all at a university somewhere.
Nope!
This is his home!
A previous video had him state that his wife came down about the noise, as did a neighbor that he would later have to go over to and apologize to (It was night time).
This guy LOVES what he does, and is absolutely great at it.
As I have told my contacts privately, if I had this guy as an instructor when in collage I would be in a different place now.
I checked his videos to see the air conditioner one and then realized that this is the "same guy from that interesting AC invention I saw a couple months ago". Very cool stuff, subscribed.
If anyone is having trouble hearing the narration at the end, try headphones, the vocals are primarily from the right channel and the jet from the left.
it appears as if i have my headset on my head the wrong way...
Yes that sucked!! You go through most of the video on the edge of your seat with high interest/anticipation and everything goes to shit at the end... Not even a mention of the kind of thrust he was getting out of this... 50 lashes with a wet noodle!!! Pffft...
Really, you shouldn't have to wear headphones or use surround sound to get the best experience. In the future, bringing the background down a bit would be appreciated by me, at least.
@ I agree.
Thanks. You solved the problem for me. But I think that my ears are on the wrong sides of my head! 😁👍
This guy is remarkably articulate.
"I've wanted a turbojet engine since I was 4 years old". Please someone put that on a T Shirt!
I'll buy it
He looks like an unassuming uncle hanging out in his wood shop.
And yet...
OK, hes clearly a space alien!
Ted Kazhinsky on the "Good Meds"
I have never seen a more intriguing and magnetic personality on UA-cam. Take all the suggestions you want but remember it's you and what you do that makes this channel so great.
For proof of concept, you should show the thrust of the electric fan running solo in the engine, and then with fuel with the fan running at the same wattage. This type of data will help propel your channel to the next level.
Drone Voyage ... YESSS!!! It would also be interesting to stack a couple of fans in counter-rotation in the duct increasing compression and velocity etc.. The end of this was a let down of an otherwise interesting concept.
I guess it's similar to the electric turbos car ricers use, just more powerful, as this should be high rice :)
Good idea. We'll show that with the multiple fan upgrade.
The JP Hobby 90mm edf makes around 9.5lbs of thrust at 6s/125A, if this is the 12s version, it's making 13.4lbs at 117A. They're going to need a much larger force gage if they're going to measure the output.
It also doesn't sound like they're turning the edf up to 100% power when the force gage is maxxed out, so they're certainly getting added thrust from the afterburner.
I wanna see it scaled up to use a lawnmower engine to turn the fan maybe see some cooling the jet with the fuel to keep the integrity of the structure and set up the hydrocarbons for combustion by getting them excited to meet oxygen to make a hot carbon and water vapor babies
These videos make me so jealous. There is a zero percent chance I will ever have the time, energy, or funds to enjoy scientific creativity firsthand like this. You have such a special thing here. Please, don't ever let it slip out of your grasp.
I appreciate the hours and great effort you put in that project ! Thanks
Thanks for taking the time and effort to produce a video with clear explanations that help non-experts understand how jet engines work. Much appreciated!
Sure!
I feel *SO* patriotic knowing that you're using "British Thermal Units" :) God bless you, you are a TRUE engineer.
For anyone interested there are papers available on the internet written by Frank Whittle going through the full build process of his first engines, including the materials used for the turbine (Forth Rex 78 stainless, used in kitchen knives) and his issues with burners and so on. Frank patented (Edit:2nd patent)the jet 'afterburner/reheat (and turbofan engine) in 193? which he used for his supersonic engine design to go in the Miles aircraft.
I own an engineering firm, and work with subcontracted firms for some projects. Some of the technologies I've invented, I spend weeks trying to get engineers up to speed. I would love to have your skill at breaking down fundamental principles and effects. You sir, are an extraordinary teacher. I love your channel.
Thank you!
That means more coming from someone with your experience.
DYI? Do-Yourself-In projects? :-P
That's exactly what I was thinking, when he said it. 😉
Now UA-cam? Now?... The whole time I've been living without this video, and I've been wondering lost without my own jet engine..... Why now do you recommend this awesome video.
This is a true tech channel. Many varied interests, concise explanations, suburb audiovisual. It feels like I'm in an engineering lecture watching this channel please look into getting a patreon account
Thank you for teaching, without dumbing down the material for the lowest common denominator. It’s rare to find on UA-cam.
" Are you ready, let's get started!" You're a brave man to stand near that!
Extremely well done sir! The way you explained things in 15 minutes allowed me to mentally connect many dots I've had floating in my head over the years in regard to the principles of how a turbojet engine works. Very much looking forward to the next portions of this series! :-)
*GOD* Bless you..
I was working for my project pulse jet engine and searching so many content in last 3 days, pulse jet is quite good but it gets really hot and not good for or ideal aircraft output using as a engine.
so I was searching for another solution for engine that is cheap safe, easy to use and low cost fuel and maintenance so I found out that p300 small jet engine that use fuel and quiet expensive but durability and maintenance better than pulse engine jet.
Now you have give me a solution electric ducted fan and I have search in the internet it has quite good lb.
Very much safe and easy to use recyclable.
*I* like the way you talk and Teach.
Very Easy to understand (who is from 3rd world)
Best *UA-cam* CHANNEL I HAVE FOUND.
Thanks!
Thank you very much for finally clearing up my confusion about the paradox of the standard jet engine. The combustion chamber increases the volume! (not the pressure) From that I see the equation of pressure diff times volume equals work, which means that the turbine produces far more work than used by the compressor, thus leaving excess for other work.
It's unfortunate how so many explanations fail to properly point this out.
I suspect it is the "missing link" for a lot of people.
Could you use a water mister to increase thrust? You could even mist on the outside of the tube to decrease Temps to allow increased running output
Yes, that is a very interesting idea. Our plan with the second fan is to introduce a water/alcohol mix between the stages to reduce the temperature rise associated with compression as is done with an inter-cooler and increase the air density. Note: don't choose methanol.
Why not? Too explosive?
Actually, less explosive, but too powerful a solvent effect for the motors. The liquid will pass both around and THROUGH the motor providing direct cooling to the winding.
Huh, that makes sense. Last thing you need is something inside a motor being eaten by the solvent!
Unlikely, as (so far as I can tell) the water is going to be aspirated into the air stream between the compressors. However, it won't be wasted - the more mass you can throw out of the back of this kind of engine, the more thrust you will get.
This is a wonderful video. There's not many experimenters around anymore where it is worth the time to listen to their explanations, let alone quantify their results like you do.
I would like to point out that on full size jet engines, the start up procedure is to first set the turbine rotating to a set speed with the starter (pneumatic or electric), trigger the igniter, then introduce fuel. This is done to decrease the risk of liquid fuel pooling and causing what is called a hot start, which can damage the combustion chamber. You sidestepped this by using propane, but it's helpful to know for future experimentation.
Wow. You really know what you are talking about. And more importantly for someone making and sharing videos, you know how to explain things well. Most people cannot do the latter. I am looking forward to more on this from you. Thank you!
the name of this type of jet is a "motor jet". there were a handful of modestly successful examples in the first half of the twentieth century with gasoline-engine front ends. ultimately the weight efficiency of driving the compressor with a turbine was well worth the substantial development difficulty
true, but now with the strong permanent magnets in brush-less DC motors, you can do some pretty wild things.
Joseph F it's the difference between low tech and high tech. you can't beat the efficiency of driving the compressor with a turbine, since you already have the hot gas supply. but if you can't afford the tech you use a motor, and the advantage of electric is that it's silent and nowadays off-the-shelf
>it's silent
Not with an afterburner lol
Great explanation! That's exactly what i missed in many books and videos, that the pressure inside the combustion chamber and turbine does not increase but decrease! But the reason, how there is generated the power for the whole axel is the much higher cross-section-area but with a slightly lower pressure.
Your camera work has improved a lot. Multi camera setups increase the, uhh, let's call it effort, at a rate that scale as a square of the number of cameras; whereas the added value to the viewer only increases at a rate that scales as a multiple of 2 to the number of cameras. So, that should be in a language you guys understand. The switching of the cameras, and especially the overhead camera, during exposition is really quite distracting. TV does that to keep the viewer interested and not bore them. But, your viewers don't need that and when you are explaining something non-trivial to understand it ends up subtracting rather than adding. I was a producer and before that a camera operator for many years, so if you ever have any questions I'd be happy to help. I really, really love what you guys are doing. With the dumbing down of most media it's really essential that people keep making stuff like this. Being a polymath went out of fashion in mainstream culture but never lost its appeal for some of us. So, coming to your channel one day to learn about jet engines, or rocket engines and then coming back another day to learn about distilling banana liquor the next day, well, there really is no other place I can do that. So, don't worry too much about interesting camera set-up so much. Just keep the view stable, keep it in focus, make sure your sound is really good and just point the camera at Mr. Wizard there and le it rip. Your audience care far more about esoteric content than they do about camera set-up. Of course, you've improved by leaps and bounds in the intervening two years, so my critique isn't exactly germane anymore. Take from it what you can... And thank you, so much, for making knowledge cool. I detest the culture of being proud of ignorance so much. I imagine you do too.
And I was waiting with a pen and a paper to write down the instructions ..but I am really very impressed the way you described what's actually going on inside .. thank sir will wait for your next video
Thanks!
Did you see that we followed this video with an improved version of this jet?
Cool project! You definately know how you keep me interested and wanting more :) I really enjoy the more elaborate explanation (compared to other tech youtubers), definately an example I want to follow!
I am looking to find a good toturial on how to build a rc jet engine and I saw your video. I have seen many of your video's and I love the way you teach people something. For me you are the best and it is easy to understand you. And I had smile on my face and happy until you changed into the pulse engine....:(
You are awesome dude. Probably start with a wider engine body... Larger input compressor fan... Neck it down significantly and you will have a much different performance... Yours looks like a ram jet at the end of the video. It's spectacular to watch. Starting off with more volume of air allows for greater compression potential. Potentially more efficient in an engine such as this...
The hybrid idea is absolutely genius. Will have less internal drag without turbine blades.
Excellent UA-cam Channel. Metric data in addition to what you already provide would be brilliant!
Thanks a lot!
You're welcome!
I'm an "ex-T56-7/15 turbo prop tech", had always been interested in the easier/simpler engines such as the Ram, Pulse, and motor-jet engine (which you made). Your motor-jet is probably the best on YT (and I've seen quite a few of them, some of them are Almost as good as yours and some are just crappy "jokes"). any how good job :-)
Excellent explanation. Thank-you for setting the record straight. Unfortunately, on an iPad, your audio is only about Q2 or Q3 when the jet power is increased.
This is truly is the best channel I've found in a very long while, it's very professional and well made educational content which is super interesting! Never stop!
Finally someone who knows what he's doing. Where was this gem hidden all this time.
Thanks!
Really great job explaining the operation of a jet engine in an easy to understand video. I am looking forward to the upcoming videos, especially liquid fuelling and more thrust! Big thumbs up. Thankyou!
jack ass
I didn’t even finish the video yet. I can’t understand how this video doesn’t have more views
Wow! Some gears started slowly turning in my head! But I can't say that I really understand how jet engines work. Could you please discuss it in a future video and breakdown pressure gradients, velocity, volume, and the force that in the end provides the thrust (maybe on a chalkboard/piece of paper). Maybe compare how the engine you have built works to those we find on commercial airplanes. to the Many other videos on UA-cam are simplifications that are not very helpful and sometimes misleading. Hopefully there are more viewers out there that would be interested!
As always, your content is truly incredible!
What an incredibly simple, yet good explanation of the turbine and its function.
A very good explanation of your hybrid jet engine. Try using vaporised methanol at the front of the first ducted motor then watch how much power you get out of it.
Best accurate explanation of how a jet turbine engine works
Version 2.0 is finished and tested. We will be producing that video in a few days.
Oh, and thanks!
Pragmatic speech blows me away every time. I didn't hear a thing you said, I was that impressed. I will have to watch later to see if you have left anything out, but I don't like my chances. Thanks, Thumbs up, subscribed.
Thanks!
ok...this channel is very awesome,but...we have see turbojet,rocket and hybrid jet, i think is time for air-turbo rocket!!
Seriously it is really the best channel on the topic that exists on youtube.
I have to say, while most of the video is sensible and fascinating; the use of BTU made me jump back in my seat!
Fair enough.
I'd be one of your first patrons, your videos are outstanding and always pique my curiosity even more! Thank you for the great content!
Most comfortable workshop I have ever seen.
This is the best hoke made jet on UA-cam
Excellent video, gives solid understanding of how turbine gas generators work.. Heat does the work as they produce high volume high velocity gas flow..essentially they use fuel to expand air to create acceleration of mass/volume, some of which is tapped to pump a lot more air into the system, so that net expanded volume & velocity are compounded..the afterburner adds more fuel and thereby MORE heat beyond the core of the engine, so that even more velocity is created..resulting in compounded thrust.. steps of acceleration as air is primarily then secondarily expanded.. oh such a beautiful thing😁 Imagine the steepness of a slide.. if you imagine the shallow gradient, you slide down slowly..if you add gradient so its steeper, the faster you slide down..so the greater the difference in gradient, the more kinetic energy is realized.. the idea is to create the highest pressure gradient through the system& extract the greatest gradient in BTU, efficiently turning BTU into EXPANSION rather than increased temperature .. Latest technologies allow higher temperatures & thereby utilization of the greater efficiency of the more extreme expansion .. more heat added to a heat engine, more work done.. so long as materials can handle it!😄
So then when you introduce the second stage fan and get more compression, you will have lower temperatures due to the greater air mass moving in? Or are you going to put in even more fuel to keep the high temps?
Is the steel holding up?
Is that plain 304 stainless? or something more exotic like high temp inconel?
It's 304 stainless and there is some erosion and deformation near the junction with the nozzle strips. The second fan increases the compression ratio and even if no additional heat energy is added there will be more thrust as well as more efficient use of the same heat in converting thermal energy into exhaust, kinetic energy. Nevertheless, additional mass will also flow and so some additional fuel can be added as well.
Just discovered this channel. These are really cool projects.
What a wonderful jet engine...so well constructed and thought out. Was there a cooling annulus provided at the combustion stage onward to keep the interior cool?
Thanks!
Not in this version, but in the video that follows, we added a second stage to the compressor and an inner cooling jacket for that purpose.
I would have to rate this as my favourite youtube video site
11:38 i wonder if you could run it with HHO-Gas instead of butane. That might bring more Heat (BTU) ?
It would. The advantage of propane is the higher energy density and easy compressibility of the hydrocarbon fuel. Hydrogen has a huge amount of energy/gm, but much less per cc.
@@TechIngredientsthx for the reply, but i mean HHO has already Oxygen in it , so it needs less to no mixing and turbulance behind the fans (i would guess).
Very similar to something I'm working on. I got the idea to try something like this about 5 years ago while I was sitting in a jet propulsion class, but until now I've just been a cash poor mechanical engineering student.
To be honest its kind of depressing to see someone else demonstrating an idea so similar to my own, but I guess the fact that it seems to be viable for you is heartening.
This idea is not so profound that you missed your shot. There have been some early attempts to do this on UA-cam. The trick is dealing with the low compression ratios available from electric fans/compressors. This is why electrically driven turbochargers have failed to compete in the automotive area. With version 2.0 we have achieved an augmentation ratio of 2.3 which is close to the theoretical limit of 2.6.
Where this gets interesting is when ram pressure is added. Typical turbojets only see a significant effect from ram pressure at relatively high flight speeds. Also, the benefit of turbo inter cooling may have some application to subsonic ram jets.
Man I love your shop, and your channel. Thank you for what you do!
That is great to hear!
Would it be more beneficial for the second stage compressor to be contra-rotating with the first or would it be better for them to spin the same direction?
Contra-rotating and that is what we are doing.
Thank you for your video, the way you are explaining the topic and the vocabulary you are using makes it very interesting to watch. There's lot of valuable informations.
That was awesome, i cant wait for more.
To my knowledge I don't recall ever hearing of any motorjet that has a particularly worthwhile power increase due to it's afterburner? And I have looked long and hard and tried myself. Does the concept actually even really work? I really want it to! I really hope that your efforts pay off. You are one of the few people I'd trust to prove if it's possible. Thank you for what you do and share with us all. Has anybody seen a motorjet that has a worthwhile power increase please?
When you say motorjet, I assume you mean an electric ducted fan. In our most recent tests with the newer, two stage jet we see more than a doubling of the thrust compared with the fans alone. The fuel use is stagering and the flame and fury is frightful. Beautiful!
An easy way to visualize what is happening without resorting to a lot of mathematics is to slowly approach the exhaust end of a running fan with an obstruction, the thrust increases substantially. The increase in volume of the exhaust within the combustion chamber requires an acceleration and this acts to increase the back pressure for the fans. We'll show this engine shortly.
I wonder if you could use a heat recovery system to generate power to operate the input fan(s)?
Would be be worth adding fins on the inside to swirl the air just after the RC fan for what I presume is a better burn?
There is already a significant amount of swirl in the air coming out of the fan. Better mixing of the fuel is always good and the presence of rows of unaligned strips in the fuel / air flow helps a lot. The nice thing about the strips is that you can continue to add additional strips until a good burn has completed, but not any more in order to avoid additional flow restriction.
Thanks for the video.
How much thrust it made at last ?
Fuel consumtion?
Thanks again.
Did you watch our follow up video on this engine?
@@TechIngredients Yes i just watched 2 next videos.
I got my answers.👍👍👍
Thanks for reply.
If this were mounted on a vehicle, What if any, influence would the addition of forced air through the front have on fuel mixture? Would it be more efficient or use even more fuel? Thanks!
Never mind. The answer is in the 3.0 video. Thanks!
What my life lack is a great mentor/friend like you!
is the reason you're not getting shock diamonds because the pressure in the thrust isnt lower than the atmosphere or because the flame is too turbulent?
The primarily reason is that we do not have sufficient pressure in the throat to overcome the turbulence and allow the shock diamonds to be clearly seen. You are correct that they are the result of supersonic flow into the surrounding atmosphere.
A nice warehouse heater:)
I was gonna say, a torpedo heater is like $99 at the harbor.
Awesome engine. Thanks for the in-depth explanation.
How do you calculate the number of holes, hole sizes & the placement of the holes on the combustion chamber? Any hand calculatioms ?
It's a little experimental, but the flow area from all the holes combined should be greater than the cross section of the combustion tube.
That is some seriously knowledge dense video. Awesome work. Looking forward for next video
Thanks! Version 2.0 of this jet was completed and tested. Stay tuned.
That's a brilliant example of a cool DIY project build.
Thanks!
sir, you are living my childhood dream.
Would ducting air around the latter stages of the engine to keep the stainless steel tube below melting temperature allow for higher combustion temperatures in the latter stages or for higher mass flow of combustion gases without needing to increase the cross sectional area of the engine? Could it also allow for using lower melting point materials that are lighter in that area?
Yes!! The next upgrade will incorporate a second stage fan as I described in the video, but we're toying with leapfrogging with the addition of a third, larger diameter bypass fan feeding these two stages as well as cooling the stainless tube and allowing higher flame temperatures as well.
It is pretty interesting that you can do this with stainless steel instead of titanium. With the access to the high temperature and the constant stream of cooling air from the third or access to fresh outside air cooling, would a thermopile be able to generate significant energy? Since we are looking at a temperature difference of hundreds of degrees K, is why I ask.
Brilliant would love to see it at sub assembly level of individual components so it's easier to visualise.
OK, when we install the second fan and the liquid fuel sprayers we'll lay out an "exploded" view of the sub components.
Tech Ingredients ... Great!! Looking forward to the second fan in counter-rotation.:) you may want to consider an increase in number of blades in second fan and higher output/RPM... I would also use direct drive out-runner type motors for this... Although that may require some modification to off the shelf items. But you seem quite resourceful... HA! :)
Cool project, ive thrown around the idea of building one of these for quite a while, great to see it working!
so calmly and easily explained, subbed
How much of a thrust increase did you see over the EDFs default max thrust?
Would a centrifugal fan create higher static pressure for the same size as an axial fan? if memory serves me the first jet engines used centrifugal compressors.
What if also exhaust gases from piston generator would be driven into the combustion chamber, wouldn't that raise overall efficiency too?
Great video, but one suggestion regarding the video itself: Can we stick to the camera to a tripod, and have other close ups on a b-roll? Thanks!
Damn. Best I've seen on UA-cam, looking forward to the next.
Thanks!
There are a few and we'll be uploading another in a couple of days.
This channel is outstanding!
Thank you 4 your work.
Sure!
Yes! And believe it or not folks! He makes rocket engines too! I can't wait until he builds an interstellar propulsion device!
Great video as usual!
Peace
Ah flash back days @test cell on TF-30 F404s - you need hi bypass to channel cool air beyond your compressors to AB section, very nice project!
We may in fact do that and eliminate the water, but we wanted to try that out first. Sometimes the best idea is to simply try it.
How cute! Your expression shows how proud you are of your new propane burning, thrust producing baby. And rightly so.
"Pulsejets tend to be very loud."
Loud doesn't even begin to describe loudness the produce.
Think along the lines of a high power rifle shooting 50-100 rounds per second.
"They aren'tloud once you have heard one.."
". . . . W H A T . . . ?"
🤣
Yes, supersonic flow.. very obnoxious sound.. good cause of hearing loss.. but did you ever see one of those cherry red hot rockets fly? 🤯😮😃😂😉👍
@@francisconti9085 The dead around here are still awake...
Your work bench in the back ground is that made from aluminum extrusions?!? Looks great.
That entire bench is a large, pulsed dye laser. I explain the design and demo this laser in a couple of earlier videos.
Neat. I've been thinking about making a net engine for electrical power generation, and every bit of information helps.
You know in Breaking Bad, that scene where Jessie tries heroine for the first time? That's basically me whenever a new TechIngredients video is released.
I need one for my bicycle to speed up my newspaper delivery route.
Do you ship to Australia?
If it's outputting more thrust.. should the fan spin faster than the battery can push the motor to draw in air?
Its outputting more thrust because the same mass of air, moving through the fan, has expanded due to the added heat. This causes that same mass of air to accelerate down the tailpipe and reach a higher final velocity.
What is the increase of thrust measured against the ducted fan alone considering the added weight?
We demonstrate that in the follow up video that shows the upgraded version of this engine.
How did you coat with ceramic stanles steel? can you tell me what process was used? And how did you do it?
I didn't. We contracted that out to a local plasma spray coater.
Could you show us more pictures from the inside and the assembeling. As a german with a low degree in English it's sometimes hard to follow your descriptions. And thanks to you and your team, you are awesome!
This channel just keeps suprising...