The start of our video series on jet engines. We demo this engine running at 2 million BTU and explain the principles behind the design of our hybrid electric jet.
This is by far the most technically competent and entertaining video on RU-vid (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
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 лет назад
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.
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.
I have never seen a more intriguing and magnetic personality on RU-vid. Take all the suggestions you want but remember it's you and what you do that makes this channel so great.
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! :-)
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.
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.
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!
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.
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
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!
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
Now RU-vid? 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 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.
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.
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.
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....:(
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
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 RU-vid 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!
*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 *RU-vid* CHANNEL I HAVE FOUND.
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 :-)
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.
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!
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.
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 RU-vid. 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.
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
There's a lot of work has gone into this behind the scenes, you've earned my respect. May I ask how many people are working on this project and how long did it take?
The fan is stalled. I would replace the axial fan with a mixed flow one with static vanes. With a single stage you can create much more pressure and the output is already in annular shape. Your videos are awesome!
great job ! some friends and I the idea to do this back ~ 1993 but in those days powerful EDF units didnt exist, so we had the idea to use a glowplug engine to power it. actually ducted fans at all were very unusual back then. As we found when we tried it a cheap glow motor simply doesnt spin fast enough for a small diameter fan to generate much thrust / pressure, which is where we gae up. DELIGHTED to see your success and really look forward to see the outcome when you add a second compressor stage (I guess you will need to either engineer some stator blades or easier/better find a fan that rotates the opposite direction ?. Would also be nice to have an anulus that can be resized on the fly (a big ask I know, thats a project in itself). If you have fuel flow sensors would be interesting to try to graph thrust vs fuel flow (vs internal pressure / fan power setting as a 3D surface). Just as DARPA for a grant and three research assistants ;-). GREAT JOB MANY 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.
Hi, can you tell me what the native thrust of the ducted fan is on it's own? Also, what the KV of the motor was and it's 12s amp rating or what size ESC you used?
Yes, this was a lot of fun. Thank you for uploading. Your fans, myself included, would like to know a little bit about your background if you don't mind sharing.
I found your channel not too long ago from AvE. (The flat panel speakers using rigid panels and audio transducers.) This might seem silly, but yesterday I was thinking about supersonic shock waves for compressing air (ala the X-43.)
I can see there’s 2 nodes in the design, by having a variable diameter outlet nozzle this will be critical in tuning the ohm rate and cancel any excessive potential buildup. I’d be curious to see if installing a ring that can adjust the volume inlet/outlet while still inside the engine itself would slightly cool the outer area of the shell as well as allowing more volume to exit the tail end and then the tail nozzle can be optimized for a re-heater array to provide an additional 25% thrust when needed, maybe even add in a WEP type injector to see how it’ll behave. For cooling, that’s a tough one given the RC craft application. Heat kills is everyone’s watchwords when working with propulsion systems so aside from running coolant fluid through conduits around the entire engine, that leave the options of hi temp alloys and air cooling. A secondary high pressure-medium volume fan that pushes air down the exterior of the engine while a 1 1/4” gap is maintained between the outer shell and the engine body, similar to how old steam engines were in the 40’s, they had sheet metal jacket surrounding the boiler and put insulation between the boiler and jacket. So it would be similar but just an air gab to allow cooler air to flow and then it can either be dumped or diverted into the rear area either near the combustion chamber. I wonder if the engine could have a shaft that came out of the front so a small fan could be mounted to drive the air cooling fan? Thank you for taking time to explain your work sir.
Aside from being really neat, do you have plans for the engine in a practical sense? Perhaps you intend to use it on an aircraft someday or is it more of a display piece?
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.
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!😄
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.
