So You Want to Design a Jet Engine

This video is in response to the many people who have told me they are designing an amazing new engine idea, and are asking for my assistance.
With respect, I try to remind them of the enormity of what they are attempting.
I'm not sure they really know, but I encourage them to try.

[@rockroll9421]

I am an professional Aeronautical engineer. Currently i work for Rolls Royce Civil large engines. Believe me designing a whole jet is not a small job, it take 10-15 years of research and thousands of engineers hardwork 🔥

[@donaldstanfield8862]

Thanks for using your amazing skills for such good purposes!!!

[@SkyhawkSteve]

As an engineer, I appreciate your effort to convey just how much knowledge goes into high tech items. I was an engineer at McDonnell Douglas, and later at Caterpillar. I worked with so many smart people in so many different areas of expertise that it was truly humbling. It was a joy to work with so many clever people. Hopefully some of your viewers will go into these areas of study, make contributions, and share their stories.

[@unexploredmind5550]

And I'm still struggling to get into my dream job 😂

[@SkyhawkSteve]

@@unexploredmind5550 it might have been easier when Ronald Reagan was throwing tons of money at the defense industry. It should also be noted that funding for aerospace comes and goes very quickly, so you have to be prepared to use Plan B. Good luck!

[@jamesmason2228]

I was always impressed by your restraint when questions of this sort showed up. I'm impressed that you were able to prevent this from becoming a bit of rant.

[@AgentJayZ]

Well, I don't ever want to discourage anyone. Someday, somebody is going to revolutionize the world, and I don't want to reduce that persons chances at success, or even delay them.

[@jamesmason2228]

@@AgentJayZ I hope you have apprentices who work with you from time to time. You're just born to teach. For my part - I'll never mess with a gas turbine engine - but I really enjoy listening to your obvious passion for the subject. And it's cool to surprise my youngest (in US Army rotary wing training) with power plant knowledge. Got to keep the youngsters on their toes!

[@ksbs2036]

When I was young I thought everything was designed from scratch. Only later did I realize that nothing is designed from scratch. There's always a working unit that serves as the starting point. Great video Agent JZ. Always fun to listen to you

[@gunnergrant12]

As a jet propulsion engineer, this was very amusing. Great job and choices of words, you’re 100% correct. I also own a few books from Mr. Mattingly that were part of my college courses, including the one you mentioned. Great books.

[@UncleKennysPlace]

My day job is commercial jet engine certification and military engine qualification. I have held Whittle`s engine test logs in my hand. It is rocket science, to be sure. And even with hundreds of engineers and supercomputer fluid dynamics, stuff still doesn't go according to plan. Ever.

[@AgentJayZ]

Always good to hear from professionals in the biz.

[@TheSpaceGuy1]

I am an engineer at a small jet engine manufacturer in our expansion department (everything combuster and aft). It can take weeks to just to change the tolerance on an engineering print by .002" because of how many people need to approve of changes. And I work on small engines, I can't imagine what the manufactures of the larger ones have to deal with. Engines are very complicated and it takes teams of people and a lot of time to design new engines. Even if you could design one by yourself, manufacturing one is an entire other story too. Tolerances on the shaft of an engine can approach .0002" and it takes a lot expensive equipment to manufacture parts that accurately. I think its pretty unrealistic for an individual to make a jet engine approaching the complexity of any production engine.

[@AgentJayZ]

I agree, and it's always good to hear from a professional in the biz!

[@cynaptyc]

I can only see failure for and individual. There are just so many thing you have to have better then a rudimentary knowledge of to get so many things to sing, so to speak! Now as for a hobbiest type turbine there could be a chance, maybe!? But then the machining it the toughest spot there! They are truly marvelous machines!

[@imagiro1]

Designing a jet engine - sure, no problem. Building it according to the design - well, let's see. Making it run - uhm, not so sure about that. Preventing it from burning up - ok, _that's_ a challenge. Producing thrust - probably not. Making it run again, and again, and again for hours - yeah, I'd like to see that... Making a plane fly with that engine - I highly doubt it. Getting me on that plane - no way, dude! Oh, btw: Happy new year, to you, @agentjayz! All the best, for work, for making videos, for racing, for repairing speakers, mountain biking and whatever else there might be!

[@Kargoneth]

"So You Want to Design a Jet Engine?" Who doesn't?

[@sourabhg5418]

Who aren't fascinated with the thought.

[@rsw7231]

😅 seriously man

[@LanaaAmor]

I thought I was the only one :o

[@petethagore6975]

The Avon blade measurement at the end literally broke me 🤣🤣🤣.... I once saw the blueprint of this exact part and i have to say its a really impressive drawing. The curvature have 7-8 different profile with many more spline control point for each one of them......... and all that where created in the 50's without CAD !!! I have a LOT of respect to the engineers and machinist of these time. Good wake up call to those little budding genius !!

[@obsoleteprofessor2034]

I have an idea for an upgrade on the Harrier engine. I will call it the Harriest.

[@_r-a-f_]

Take a like and get out :P

[@grahamj9101]

Been there, done that, but didn't get a tee-shirt - and didn't even get my name in that book.

[@davidrivas55]

"The dimension of the compressor is.......42" 🤣 ahh jee thanks mister that's the number I was missing lmao Great vid

[@jetranger47]

Well said. This reminds me of several people who have told me that because they flew a helicopter in a computer flight simulator, they could fly a real one. I challenged them to do the by offering to pay for an hour in a 206 without prompting from an instructor... but they had to pay me back double if the real pilot next to them had to touch the controls. They all backed down.

[@richardhead8264]

_17 people have their soup cans and tin snips ready to go._ ☝🤓

[@ROTHGLUT]

after 15 years of fiddling around with our self build rc jetengines, we are thinking of designing a bigger one. (mainly because the neighbors unimpressedness of the noise.) Now you scratch on my confidence a bit... But on the other hand, we do not expect to be better than anyone, it only needs to scare my self. I will read some more books and decide later... Happy new Year and thanks for the content and booktips and all

[@LanaaAmor]

you made your own rc jet engine? Designed it too??

[@ROTHGLUT]

@@LanaaAmor We did build it, but we did not design it (we did buy the UT160 plans). I would like to design a bigger one, but its very hard.... I got a clip of it: kzbin.info/www/bejne/bmWchp2OfL6GjLc

[@lyntonr6188]

Great work as always 👍 12:30 as a machinist I have had long arguments with engineers and designers about standardisation of parts ,some clown at a computer draws 330 non standard countersunk bolt dimensions and then wonders why the machinist wants to hit him over the head with a book of bolt standards ...🤣👍 (real life example ,not in any way related to building jet engines ,but a real life example of why designers need people checking their work BEFORE it goes to the machine shop...)

[@donstetson8535]

I've waited patiently and it's finally our turn. The runway is ready, the airspace is ready, the throttles advance. the brakes release. I begin a journey of several hours that it might take a man on horseback several weeks to complete. As speed builds, a childish voice behind me says out loud what I always say in my head, "Yee Haw!" Perhaps a future technician or engineer with skills to help transform piles of ore and puddles of petroleum into this fantastic machine. Then I glance down the isle to see folks reading newspapers or listening to MP3 players. Don't they understand the extreme forces and temperatures at work just outside the windows? Sadly, they are missing out, the poor, misguided souls. Thanks for the inspirational New Year rantlet.

[@saratogapilot6100]

Marvelously-written and worth quoting. Thanks for brightening my day.

[@AgentJayZ]

I agree. I wish there were cameras on top of the tail, at each wingtip, and underneath the plane showing the landing gear. Sadly, the committees have decided that the average passenger might be unsettled by that. Let's all be average, people!

[@Martinit0]

Don, please write a book.

[@grahamj9101]

@@AgentJayZ I've flown on a Malaysia Airlines A380 into/out of KL, on my way to/from Singapore. The do have a tailcam, so that you can watch on your screen. What I found a little unsettling was the tropical lightning of a distant storm.

[@oldretireddude]

I was privileged to be introduced to, and shake hands with, Hans Von Ohain during a short meet and greet ahead of a class that I was taking in the late 1980's. Really enjoyed his presentation.

[@astralnut6313]

I spent my career in an Aerospace Foundry. Many of the parts in this series are from the industry and even the foundry I engineered for. The material science and metallurgy is supremely advanced. Alloys in jet engine construction are Titanium in the cold section and superalloys in the hot section. All of those alloys have to be cast in advanced vacuum induction and arc reduction furnaces. Those processes are completely beyond any home hobby project. You might make a small jet but it will not last and will be nothing but a hobby simulator.

[@fascistpedant758]

I've counted to infinity twice, but I can't imagine counting to infinity squared.

[@AgentJayZ]

You're one of the smart ones...

[@tatdexter2334]

One of my first summer jobs was working in a spin-pit, balancing radial flow components for APUs. A ton of money invested for one small aspect of many. I encourage all jet engine developers to video their progress and tests... RUD (Rapid Unscheduled Disassembly) videos get a lot of hits on KZbin. AgentJayZ - thanks for taking the time to prepare and post these videos, love the tech talks and history you bring. A dram is 1/16 of an oz. or about 1.77 grams. Happy New Year all!

[@TheWiseFool_]

After 4 years of study at Embry Riddle Aeronautical University - Aerospace Engineering (Propulsion) - your senior (5th) year project is to do just that, design a turbo jet that functions on PAPER. It takes 5 of us 5 months to get that far with $1M worth of engineering software. And we don't even know if it will work in reality. Food for thought.....(5yrs at Riddle $250k)

[@TheWiseFool_]

And as to the title... Been there, done that, had to pay for the t-shirt in the bookstore......

[@bensabraham4863]

@@TheWiseFool_ really awesome man ,i would have gone for aeronautical if i had a choice

[@Kiera_Jackson74]

Again... your Burke/Asimov level of explanation and wit is on full display. I also break down technical details so people without the knowledge can digest them without their heads exploding. Well done.

[@SnoDraken]

With regards to measuring the length of a crankshaft, one time in my shop we received a compressor rotor from our customer's spares line and they asked us to prep it and install it in an overhaul we were doing for them. We visually inspected it, cleaned it, inspected it again as normal, Checked balance on it, and began the installation expecting zero problems. As we lowered the unit down towards the case it became apparent that it would never go in as the stages were not in their correct positions. After a ton of head-scratching followed by a very vigorous teardown inspection, we discovered "shop-X" had lapped the living daylights out of the compressor discs (TB5000) shortening the compressor rotor assembly by over .750 inches. Total scrap.

[@AgentJayZ]

That's a great story. Expect the unexpected, eh?

[@youtert]

I'm building a tokamak fusion reactor for my high-school science fair project, can you provide any pointers?

[@AgentJayZ]

Bagels, not donuts.

[@evilsoulzprezz]

@@AgentJayZ loool

[@merlepatterson]

If someone even wanted to begin to design their own jet engine, it would help to 1) have a mechanical engineering PhD, 2) Gather a team of CAD designers 3) Hire a fluid dynamics PhD 4) Hire an Electrical engineer and 5) Buy a $5 million dollar user license for CATIA and time in a NASA-like testing facility. However, design concept/type modifications as suggestions are just fine. Nobody gets harmed from the suggestion of a concept. They can either accept or reject it and then move on, easy peazy.

[@inothome]

Came for a rant and wasn't disappointed, great start to the new year! Gave out the compressor dimension.... of a turbine blade. I know you were testing to see who was paying attention.

[@anonpls9909]

I Saw a Russian youtuber build a model jet engine in a shed, most impressive show of solo craftsmanship and engineering I've ever seen

[@Shubhamsingh-lw5tv]

Can you please share his channel link with me

[@anonpls9909]

@@Shubhamsingh-lw5tv Игорь Негода , this is the video kzbin.info/www/bejne/moqpio1jnJyZsKM

[@tachios85]

Yeah, Igor Neroda is some kind of genius though. But bear in mind that all he aimed it to do was work for a while - no efficiency considerations or durability or anything other than having it work and produce thrust. Still, he did fly it on an RC plane he built himself. He's some kind of genius, like I said.

[@GeorgeRon]

@@anonpls9909 Wow that is some video, thanks for sharing

[@jw4620]

You have put more effort into this presentation than most of the wouuld-be designers have put into their projects to date.

[@superdau]

The standard answer is: if you have to ask for a solution in a youtube comment, it is clear you haven't done even your most basic preparation on a topic.

[@AgentJayZ]

This is true in almost every case, but sometimes I get some really good questions.

[@davidwalle5025]

I heard Dr. Hans Von Ohain speak in person about developing the jet engine. Lots of work and required the facilities of hieklel to get an actual working engine. Dr. Von Ohian started with crude proof of concepts to show that it might be able to be built at first. one of his biggest problems early on was getting liquid fuel to burn, he developed his very first engines using natural gas as a fuel. Dr. Von Ohain was a great guy. I am grateful that I had the honor of hearing him speak .

[@grahamj9101]

In contrast, Frank Whittle used kerosene and even his first engine was far more robust than von Ohain's sheet metal device, and went through numerous rebuilds. Sadly, I was never able to meet Sir Frank in person, although I saw him when he was present for the rededication of Whittle House at R-R Bristol. I have watched numerous documentaries about him over the years, of course, as I effectively owe my career to him. I have since met his son, Ian, on two occasions, when he has given lectures on the life and work of his father. He very kindly signed a copy of his father's book, 'Jet: The Story of a Pioneer', for me.

[@rcman50166]

I only needed two books to design my engine. "Gas Tubine Theory 4th Edition" by Cohen, Rogers, and Saravanamutto and "Gas Turbine Combustion" by Lefebvre. These are not introductory books and assume you know thermodynamics and have an engineering mindset. But everything is covered. Mine is a 300mm inlet engine. So APU scales, but will be using a free power turbine output. My advice to beginners is to make a automotive turbo engine first. It's been done a million times, yea, but the theory and design is only half of it. Combustor design is generations tribal knowledge and not methodically engineered as the compressor or turbine. Automotive turbo gas turbines use can style combustors which are easy to iterate on. Get good at that first, then go bigger and more expensive. Why blow more money on R&D than you have to?

[@anotheruser676]

Looking forward to it changing the world - per the vid

[@rcman50166]

@@anotheruser676 if that were the goal, sure.

[@grahamj9101]

You will need a lot more than that. Cohen and Rogers (before Saravanamuttoo joined in), plus Rogers and Mayhew, plus a few more books, plus a degree course in mechanical engineering, plus a five-year apprenticeship might help. And then, after 41 years you will be some good at it, provided you are a member of a good team of gas turbine engineers.

[@shawndinterman2219]

Every video my wife ask "why do you watch this channel?" I'm not sure why but I like him

[@deanropchan7213]

31:00 - 31:50 ... literally the hardest I’ve laughed in the past year.

[@danielhooke6115]

“The more you know, the more you know you don't know.” ~Aristotle

[@jackwhitestripe7342]

It must be Mao

[@gordonlawrence1448]

I am en electronics design engineer. I have also designed some mechanical systems for commercial jets. For a laugh I decided to try and make a "bean can" jet engine. The best I managed was 0.6ish pounds of thrust for somewhere between 25 and 27 seconds before it destroyed itself. That's with mad maths skills and a good knowledge of design processes (though not the specifics of turbojets). To mnake things easier it used propane and brass ring burner with v shaped steel flame holder (bent in a circle which was a complete game). Colin Furze managed to make some better engines but they need way more in terms of oil pumps and all sorts. Even then he maxes out at 100 pounds thrust or so and it guzzles fuel like a mad thing (as did mine). I worked out that mine had about 1% of the efficiency of a Williams FJ44. So though you "can" get something that sort of works, JZ is absolute,y correct in that it takes a large specialist team ages to get an engine right. I live near the RR plant and know some of the engineers, and one I used to drink with a lot spent two years on one compressor blade to get it to the point where RR were happy with the performance. That's two years for a guy to get just one of several blade types right. Apparently the turbine blades are a lot more difficult.

[@shoutout.kokain8713]

the amount of facetiousness in this video is just right! you're awesome!

[@C-M-E]

As one of those people who are undertaking this kind of endeavor, reading the books Jay presented and getting intimately familiar with a 3D printer should be your first steps, followed shortly after by forgetting everything you know about internal combustion engines and how they may benefit your wild design, because almost nothing short of metal fatigue and the general principles of combustion will transfer. I'm 2 years into my process, have 3 massive redesigns under my belt, an entire workshop of parts surrounding me, and a giant hole where my bank account used to be. After finally finding a breakthrough that perhaps could/should make an evolutionary breakthrough of the next generation of engines that can be made for multiple platforms, I will tell you that packaging and new materials are almost certainly the two most obvious areas where one can find the most benefit to 'reinventing' the wheel, provided you can scale it both up and down. Also be prepared to fail and fail often, learn from your mistakes and improve from your failures. I hope to have my failures on display when I finally get this prototype ready to unveil to the world that should make an interesting museum entryway exhibit. Your processes you develop will also have more impact and possibly benefit your bottom line far more than the end product itself, so get ready to learn about protecting trade secrets along with becoming an engineer, machinist, chemist and any number of other specialists. Lastly, be prepared for everyone in your life to call you a whackjob and expect constant ridicule. =/

[@AgentJayZ]

Sir, it appears to me that you have quite a good grasp of the magnitude of the project. I wish you success, and I would love to see some pics or videos of your adventure.

[@C-M-E]

@@AgentJayZ One of these days when I have a bunch of downtime, I definitely need to organize my build process media and make it into a discernible presentation, but in the meantime I can find some interesting snaps of the composite work and send those to an email box near you. Thank you for the kind words and your continued efforts to educate the world at large.

[@eric4946]

I think people confuse being able to work on something vs knowing how to design it. The amount of time spent on the design of a part let alone a section of an engine is massive. A jet engine mass produced is a 10-30m asset. That should reflect the complexity involved in design. A piston engine is literally 1000 times simpler.

[@billkahl1147]

I don't think too many people will understand where the answer of 42 came from! It will take awhile for the computer to come up with that number and you will have to remember what it was that you were trying to calculate in the first place.

[@RepJock88]

Oh, we’re around. Had my 42nd last year, Douglas Adams style! 😎

[@bemm69yah]

Only Hitchhikers will have a Thumb out for that one.

[@grahamj9101]

Holy Belgium, man! You need a shot of Pan Galactic Gargle Blaster.

[@napalmholocaust9093]

You are referring to the 'Dunning- Kreuger effect' often btw.

[@ur_a_buS]

Turbine design is basically rocket science :D There's a reason why top turbine engineers were hired at the beginning of the space race to help design new rocket engines that would take humans into space. The key to rocket engines at the time was new turbo/tubine pumps.

[@av8bvma513]

The five turbopumps on the Saturn V each produced more than 55,000 hp. Total, TWO HUNDRED SEVENTY-FIVE THOUSAND HORSE POWER, just for the fuel pumps.

[@ur_a_buS]

@@av8bvma513 that's a lot of herspurz. I didn't know it was that much.

[@jonknipe8997]

Happy New Year, thanks for all the videos this year, you’ve helped keep me sane. 🙂👍🏻

[@transportstream3950]

Man-or-Astroman?! A great band! I had the opportunity to see them at the Horseshoe Tavern in Toronto years back, they referred to themselves as 'a poor man's Shadowy Men' with much praise given to that band, they even covered a shadowy men song, with members of that band in the audience as well.. they had Tesla coils on stage, the whole bit.. was super awesome. The methodology and passion with which you approach your stuff is similar to the way I approach the maintenance of restored and very old large CNC routers.. lots of facts, stories, wisdom, and it's fun.. thanks for sharing this stuff!

[@AgentJayZ]

Dim the lights, and chill the ham! Kids in the Hall! OK, let's get back to business... I know a guy named Larry!

[@patjohn775]

I’m going to design a warp drive

[@arunpillai3007]

Good luck

[@blip_bloop]

Me too can you suggest a work around for e=mc^2? I need m < 0 and c > 3x10^9.

[@patjohn775]

blipbloop1000 this comment was obviously a joke, but the theoretical warp drive doesn’t need to overcome those issues. You are “warping” space technically you aren’t moving across faster than light because the space is moving under you. Kinda like a black hole can prevent light from escaping because space is “falling” into the hole faster than the speed of light

[@blip_bloop]

@@patjohn775 hmmm I see your point, but getting the mass of the warping zone to less than 0, while moving it faster than light still leaves you with the same problem. I suspect leveraging some form of hysteresis is too much to hope for.

[@nfcopier1]

You're such a smart aleck, I love it! I'm also interested in designing my own jet engine. My my goals are not quite as lofty. Something fairly small that can fly and won't get me blown up. I still feel like that's a reach, though. I'm interested in doing so for the learning experience, not for the end product.

[@AgentJayZ]

The most successful builders of what you're describing start with a turbocharger and focus on the design of the combustor. They usually run propane for fuel, because it easy to make a good fuel nozzle for it.

[@mariusd5913]

Yeah, my experience in product design and manufacturing taught me that everything works perfect in concept, in principal and will sell fantastic. In reality the devil is in the details. That's when you learn that nature is under no obligation to follow your speculation and the customer is under no obligation to be impressed by your hard work. Nature will do its best to see you fail and you have a mountain of odds to overcome.

[@evilplaguedoctor5158]

this video would easily apply to me when I was younger. I actually submitted my MS paint drawings to the Canadian air-force.. I still cringe about it now-a-days.. but hey, I've learned from that, and continue to learn, so that's progress I guess.

[@fascistpedant758]

When I was that young we only had wax crayons.

[@whathasxgottodowithit3919.]

All the best for 2021 ----A Dram inch, it is well explained below, my preference would be a "wee dram" I imagine a few of those went down well last night, and not only in Scotland.

[@grahamj9101]

Absolutely correct. I, for one, had a "wee dram" last night watching the London fireworks on TV. However, perhaps I shouldn't use that description, as it was distilled on Dartmoor.

[@pauljanssen1325]

I mixed it up with some Speyside and Lynchburg Tn whiskies the later was mixed with a mandatory Coke, as one does with drinks from the colonies

[@keeganwebber]

I found a copy of EEVIAC at the library prior to the widespread adoption of high speed internet and didn't understand what the title was referencing until i asked my grandfather, who somehow knew things about the ENIAC. Dredging up childhood memories here.

[@petermuller3995]

Happy new Year, thank you for all your videos, one of the best channels on You Tube!

[@AgentJayZ]

Thanks!

[@TroyRubert]

Excellent video! I wish each content creator made a video like this about their respective field. Happy new year!

[@carabela125]

I mounted a bottle rocket on a balsa wood airplane. It actually flew, until the wings fell off.

[@donaldstanfield8862]

What could be better!?!

[@InsanePacoTaco]

At least the front didn't fall off

[@cncshrops]

2020: the Year the Wings Fell Off.

[@marianaldenhoevel7240]

Wearing a wooly hat and in short sleeves. I like Canadians. Thank you for your videos which I discovered yesterday. I have only ever been a passenger sitting between two or four jet engines, and only now I know how much I didn't know about them.

[@librasd8087]

In my study program as a mechanical engineer there are two subjects that in total are worth 25 credits ... 1 credits are worth 25 hours between lessons, exercises and average personal study ... they make a total of 525 hours of study on average ... these two subjects serve only to carry out the objectives of the first step of the development of a jet engine. I say this to point out that to make any engine there is a lot to know and a lot to study and I think that those who want to design a jet engine by themselves have certainly not made suitable studies, otherwise they would never have come here to ask the questions I heard in this video.

[@beefgoat80]

I agree with assertion one shouldn't check something off a list until it's done. Checklists can help keep you from screwing up and forgetting something. But it won't do its job if you screw up the checklist by not using it properly. Geez, I sound like my dad. 🤣🤣🤣

[@deangiacopassi8757]

Watching the broaching machines at P&WA E. Hartford was amazing. A large machine that was incredibly quiet. Cut the fir trees in the turbine disks. I think they are now machined on a multi axis CNC machine.

[@bjoe385]

First AvE and now AgentJayZ what is it with me and slightly mad Canadian sheds in workshops.

[@MrCzarnm]

I was working with turbojets and turboshafts. My ambition was to design my own jet engine form scratch. Considering available resources I could fund model jet engine size development. So I took a challenge, as designer, machinist, technologist. It takes 9 years working part time in hobby project, building three prototypes - 1st was forced to work by extreme EGT, 2nd - work well at idle conditions, 3rd - work as expected good acceleration, low temperatures, reliable. Only compressor wheel was took from turbocharger, diffuser,combustor, axial turbine was my design. Designing small turbines you would be limited by available bearings, and available of round bar of Inconell.

[@keebordcowboy]

Happy New Year, J !

[@peterszoldan150]

This was a brilliant rant, and the 42 at the end is priceless. On the other hand, computer simulations, metal 3d printing, and simply knowledge is so widely and easily available that I would not discount the chance of a self-starter enthusiast to be able to significantly contribute with determination, perseverance, and a large dose of luck.

[@Real_Tim_S]

I love this video. I feel your pain on this topic in my own field (electronics), and also lately in discussing politics... "Just a little hand-waving and a good marketing slogan, and we can change the world..." Yeah, it doesn't work like that. Better to spend that money and effort somewhere else, but convincing people of that is a challenge I no longer accept.

[@dodaexploda]

I didn't want to build my own jet engine. Now I kinda want to build my own jet engine.

[@TeemarkConvair]

the entry point of a rabbit hole..

[@Martinit0]

Ok, ok I get it. So a rocket engine it is.

[@5000mahmud]

Eh, basically just advanced plumbing, piece of cake

[@williamyamm8803]

42, the new golden number :-) ;-) I love your channel. Geeting from France

[@rogerdotlee]

You come up with some of the best content. It's almost got me inspired enough to see if I can engineer a solution that would use something like a RB-211 to heat up my day-old pizza. Eat your heart out, Rube Goldberg.

[@briancox2721]

I think you're understating the difficulties involved.

[@AgentJayZ]

I agree with you entirely.

[@zapfanzapfan]

42 is a good answer. Make sure you know where your towel is! :-) Merry 2021!

[@grahamj9101]

And watch out for the Vogon Constructor Fleet.

[@Racing95mx]

I love this video, even more the "dimension" part !!

[@SkyhawkSteve]

Love the Man or Astroman shout out! I've been listening to them for so long. Something about their album art appeals to me as an engineer. :-)

[@marksmadhousemetaphysicalm2938]

Honestly…don’t ask someone else for how to do it if you’re going to do it yourself…go do it…I’m trying to see if I can build a small engine…not to get rich or anything…I just want to see if I can do it…I’ve seen a bunch of guys build their own…and R/C model guys build their own…why not try…but first I’m doing my due diligence and studying from the various books on the topic and hope my. Uni calculus covers my butt sufficiently 🤷‍♂️ if not… oh well… it’ll be another hobby on the scrap heap..lm a nurse practitioner that gets bored a lot … lmao … could I buy a used jet engine? Yeah…would my wife kill me? Yeah…probably…🤣🤣🤣🤣🤣

[@AgentJayZ]

I have several videos on this subject. The RC turbine engines are models, not what would call real engines. They fall extremely short in the categories of power and service life.

[@marksmadhousemetaphysicalm2938]

@@AgentJayZ thanks for sharing your knowledge…and for that information…I’m going to play around see what I can manage to build…as I said, I’m not planning on selling anything but I want to see if I can clear the cobwebs out of the old thinker and actually do something…real…my wife would kick my butt if I bought an actual jet engine … I did ask her what she thought about me getting a “simple” Williams Turbine…she said I’d need to find a new address…half joking and half not … blow my dumb self up she said … so I guess I’ll do this below the creek on our property… maybe I’m working on the car or something… :-D

[@ashleymacdonald5853]

Mechanics like this give piece of mind to the statement flying is the safest means of transport

[@markellsworth4194]

I am not sure if I was supposed to laugh my ass off or not, but I surely enjoyed this one. I am only a semi-serious enthusiast with gas turbines, which I continue to look upon with wonder. Cutaway drawings are the tip of a very beautiful iceberg here. When you get to computational fluid dynamics and supers, you really appreciate how much you must rely on experimentation and upon trial and error in this endeavor, which really says, we don't really know all of what is going on, so we tell stories and fabricate parts so we can find out how the story ends. Love your channel.

[@flyingroark]

Literally have everyone of those books and more... one could probably cobble together a 1st generation engine from published data. The vast amount of proprietary data that's actually used to make a real engine is locked up in the big boys design offices. But every year low price CFD software is pushing the boundaries of what can be simulated. I think it's only a matter of time before someone does it.

[@mobilemarshall]

The thing is those big boys are already using the most advanced software to improve their designs. Though it would be awesome if someone found a new way to do things.

[@johnnyleewalker9872]

The more you learn the less you know.

[@grahamj9101]

There's all this talk about the answer being 42, so I think that we should really challenge the folks who think they can design their own jet engine to come up with ..... The Infinite Improbability Drive.

[@AgentJayZ]

The IID... I like it! OK, we've got the basics down, but we're going to need a good design engineer to get the details to work. Hmmm. somebody with experience in engines...

[@misteenmarshall4092]

The math for a compressor isn't that difficult. India has great you tube videos.

[@AgentJayZ]

MM: I've seen those, and I do not approve. Just my professional opinion.

[@grahamj9101]

@@AgentJayZ Sorry, but I don't have a brain the size of a planet, but I do have some back pain, although It can't be as bad as the terrible pain in the diodes down Marvin's left side.

[@caddy_v3277]

Love this vid and is a great pointer of the reality of the engineering world. I work in mechatronics/robotics and even the smallest of tiny minor decisions is made by and gets input from multiple brains. Look up the dunning kruger effect aka the realization of most things are never as simple as it might seam.

[@pizzagogo6151]

Ha! Thanks for the (mild) & funny rant. clips. standard modern issue, the internet has helped create the persistence of ignorance , so that majority for people now under estimate the difficulty gaining any hard acquired skill or knowledge. First point to the misguided is if a multi-million dollar company with hundreds of experienced engineers can’t make a better engine= profitable engine ... why do you think you can??!! Someone saying they can “revolutionise jet engines” are just saying they are so dumb they don’t understand the level of complexity involved in designing one. Thanks for sharing your hard earned knowledge 😁. All the best for the new year.

[@mikejnaughton1226]

"42" "Inches or millimeters" "Yes"

[@AgentJayZ]

Cubic astronomical units, sir!

[@carneeki]

Smoots!

[@grahamj9101]

@@AgentJayZ When this Covid-19 stuff is all over, how about meeting up at The Restaurant at the End of the Universe for a Pan Galactic Gargle Blaster?

[@sourabhg5418]

More importantly how much precision or no. After decimal is enough and feasible.

[@sourabhg5418]

For taking dimensions out of a blade one have to create a cloud of points with dimensions in x, you and z to the accuracy I don't know. Sometime i think how the roots are toleranced so that they swing freely to absorb vibrations, expand contract during their operation and survive hell of stress system.

[@firstnamegklsodascb4277]

you can't design a gas turbine, but you can design a pulse jet or a solid fuel rocket (if you are smart.) Those are technically jets.

[@AgentJayZ]

Sure.

[@zapfanzapfan]

Yepp, Jet Propulsion Lab (JPL) never worked on what we would call jet engines, they were a bunch of guys playing with solid fuel rockets for Jet Assisted Take Off. JPL can also read Jack Parson Laboratory, he was an interesting dude.

[@yuglesstube]

I recommend Sir Stanley Hooker's excellent autobiography. Not much of an Engineer. From the Sptifire supercharger to the Whittle engine to the RB211. Its quite a tale!

[@csdstudio78]

Dunning-Kruger comes to mind.

[@simonwiltshire7089]

AgentJayZ is simply GOLD! Knowledgeable, a natural teacher and a and laugh out loud sense of humour! Thank you :). Some of his responses to comments are priceless!!!

[@AgentJayZ]

Thanks for the kind words!

[@ThatOneOddGuy]

Now this is the teacher I want in my schoo

[@excitedbox5705]

I think no of these people are even gonna get close to buying materials to build an engine. Building a jet engine is hard and making it work well is close to impossible without a practically infinite budget.

[@mayurmahale3049]

It indeed is. I failed pretty bad but one has to dust themselves off and try again eh?

[@johnleake708]

Virtually no-one gets the opportunity to design an engine today nor have they done it for many years.

[@JSxxxxxxx]

Came for the engine lessons Stayed for the ranting

[@victornwalunor6816]

This Guy is superly gifted!!!!! I feel awed every time he tries to dissect engines. Agent JayZ, Keep on bringing it! I'd love you to also check your email for veekindigo. Cheers

[@welltell.]

So the Answer is 42. What AgentJay Zulu is saying. The answer to the meaning of life is 42 and you should take your guide and go hitchhike the galaxy.

[@dallynsr]

lol Best 32 minutes I’ve spent in a long time...to learn 42?!

[@robc3056]

And theres me thinking 42 was the meaning of life..turns out to be a dimension of a compressor blade.....depressing..

[@0623kaboom]

what do you get when you multiply 6 x 9 .... youngin's these days arent willing to do the work ... they want the end result now ... but they forget that to get that you have to start at the bottom and work your way up .... no graduate gets employed at a company in the top spot they get placed under someone who has been there done that much longer than they have to show them the ropes ...

[@relitto1019]

hope you have a happy new year :)

[@EricTViking]

Say it as it is mate - very entertaining to a fellow engineer 👍😂 Especially the advice on how to locate books.

[@BABarracus6]

they would also need to know about Thermodynamics, fluid mechanics and heat transfer how can you build a jet engine that revolutionizes the world if you don't know what the max theoretical limit of efficiency that an particular engine can have

[@mrugennaik534]

And after they have done all of that on the design part. They will have to Manufacture it.. 🤣🤣🤣 that’s where they will realise they need another life time.. 🥲

[@mikecowen6507]

As GE was given an operational British Power Jets W.2B engine (2485 lbf thrust) to get things going, it may be fair game to say GE has *never* produced a single jet engine "completely from scratch". Moving forward, some Boeing 777 models use GE90-115 engines. At 127,900 lbf rated thrust, it's considered the 2nd most powerful production engine. Each engine produces twice the power of all the steam engines on the Titanic, combined, or as the LM9000, 65MW (power for roughly 6500 homes). A steal at $27.5MM apiece. Save your bottle caps, kiddos! For the record, the GE9X takes the prize as most powerful engine at 134,300 lbf thrust. That's a lot of incremental improvements from a design "borrowed" in 1941!

[@mikecowen6507]

@@trevoncowen9198 I believe you're taking my comment out of context. First, at the time, the war was still underway, and GE didn't have access to that tech *out of the gate.* Second, I'm not trying to insinuate there are *no* revolutionary increments in the jet engine timeline. There have been many substantial improvements along the way, but given *this* technology, where *exactly* do you draw the line? And let me be *very* clear, I'm *only* talking about concept, *NOT* engineering difficulty. The details to work out bringing the idea to life deserves much admiration and respect. Compressors. Axial vs. centrifugal. Both types were known, so is it revolutionary to say "hey, let's try the other kind"? Spools. Ok, were getting closer. Again, we have one spinny thing we already know, so what if we put 2, or 3 independent, and speed optimized spinny things, rotating on the same shaft? Combustors. This is probably the closest thing to revolutionary we have. We have a bunch of separate heat sources arranged in a circle. Can we make this into a contiguous curtain of heat? Ultimately, it's all about your definition of evolutionary vs. revolutionary.

[@mikecowen6507]

@@trevoncowen9198 Thanks! Yours too! BTW: refresh my comment. I accidentally posted before I was done composing. Yes, I think we're saying the same thing.

[@jasonlemon4491]

I built a Tin can jet engine out of a steel window cleaner spray can, it has 4 fan stages and 4 stater stages and i made the combustion chamber out of a bicycle hub I ground dow in inlet sidedown to the base of the hub, also, I lined the hub with a cone peace of sheet metal to act as a compression chamber, and 3 exhaust fan blades and 3 stater exhaust blades and a rear exhaust cone! I was inspired from watching all of your KZbin videos! @AgentJayZ

[@AgentJayZ]

Bargle crackle. There no fans in the exhaust. Whatever a stater exhaust blade is, I want one, to chop up my bacon. Mmmm, bacon!

[@mikecowen6507]

@@AgentJayZ Mebbe it goes on yer tater?

[@pibyte]

Thanks for the laughs and the interesting read. What I think you have not even mentioned all , next to all the math, physics, fluid dynamics, metallurgy, engineering, ... is the legal field: patents. I am not an expert on the topic but I suspect there to be thousands of patents around every single system in a jet engine that you have to potentially violate when you want to commercialize your "self designed" engine. So even if you get your engine up and flying (which you won't) be prepared for some really nasty cease and desist letters in the mailbox.

[@hazzard77]

I want to build a fighter jet. What is the dimension?

[@youtubasoarus]

Yes

[@Karibanu]

Quite big, but not that big.

[@hazzard77]

@@Karibanu Okay, so I can make some parts big, but other parts not that big?

[@kasuha]

42

[@vishalparihar743]

As ajent jayZ said 42 for engine so let's assume near 110 for it...

[@ShuRugal]

I feel like your talk about the work that goes into designing a jet engine is a good analogy for how the economy works. No one person produces a world-changing revolutionary business. While a new business idea can be designed and built by one or two people, it will be small, inefficient, and not much better than the other ways of doing business already in use. It takes thousands of people working together over hundreds of thousands of man hours to build a business which has the reach to change the shape of an economy. The only difference is that we falsely give the credit to just one person for so many revolutionary things that businesses have achieved, where we recognize that no one person "invented" the jet engine, much less the modern incarnations of jet engines.

[@keithyz3943]

If someone is asking you about dementions - materials etc.. I assure you they are nowhere near ready to design & build their own jet engine. ..period - FULL STOP !!!!

[@sukhnathoram1126]

You're joking ?