Design and Build a Jet Engine Yourself?

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A discussion about what a few people have suggested: Designing and building a working jet engine from scratch.
From the idea to the working engine... is it a task that one person can tackle?
Here's the first in my series of combustor liner videos:
• Combustor Liners - Tur...
Darren Duncan and his Fairchild J44 turbojet project: / dscottduncan
Here's my vid about books to get you started: • Jet Questions 96: Books!
And for anybody wondering about my shirts: • Zelensky releases vide...

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5 окт 2024

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Комментарии : 375

@SpikedaStampede Год назад

The hardest pill I had to swallow learning to become an engineer is that nobody designs stuff like this. It takes an army of people years of iterative work to improve upon previous designs. It's a massive undertaking.

@terminalarray1047 2 года назад

I'm really glad you made this video. I'm a young mechanical engineer doing my Masters right now while working for a major defense contractor and I absolutely love gas turbines. I studied them a lot at my university (from textbooks and classes) but never got near one. My non-engineering related friends are always asking me to make a gas turbine and I laugh so hard. I try to explain to them that what some guy on youtube made by converting a truck turbo into a makeshift turbojet is nowhere near an actual aero gas turbine. It's not even in the same zip code. Gas Turbines are so complex it genuinely blows my mind. So much ingenuity, thought, research, experience, trial and error, and money goes into it. I remember researching some gas turbines from GE, they had dozens of seasoned engineers working on just the combustion chamber alone. Dozens working on the compressor stages, dozens on the software etc. It's just insane. There is a reason why so few companies in the work can make these kinds of devices. It's truly on the cutting edge of human ingenuity. I put it up there as a technology that defines a country's technological capability. Only the most advanced countries in the world can reliably make these engines on a useful, competitive world-class level. I'm just gonna send them this video to explain it to them lol.

@WeBeGood06 2 года назад

You should have chosen Aerospace Engineering instead of mechanical, it's not too late.

@jang6812 2 года назад

@@WeBeGood06 you don't need an aerospace engineering degree to work in aerospace. Mechanical engineers also design aircraft engines.

@arturoeugster2377 2 года назад

por Castilla y por León, nuevo mundo alló Colón.

@terminalarray1047 2 года назад

@@WeBeGood06 It's okay lol, I decided to go into Systems Architecting because I can do lots of different cool things in the aerospace/defense industry. Also, gas turbines make use of lots of different engineering disciplines. You got mechanical engineers, thermal, chemical, materials, fluids, software etc. It's such a huge undertaking that you're bound to find a niche for yourself in a gas turbine design.

@BerndFelsche 2 года назад

In terms of life, WW2 turbojet engines were rated in tens to a hundred hours. This wasn't a major problem for e.g. an Me-262 going into combat because it was more likely to be shot down before the engine would be due to be replaced.

@carabela125 2 года назад

Can I turn a jet engine into a turbocharger for my car?

@AgentJayZ 2 года назад

Yes! Use only the hottest of hot water to shrink the delicate metal parts to appropriate size. Ooh! Last night someone actually bit my shiny metal ass!

@carabela125 2 года назад

@@AgentJayZ That won't be necessary ! My car is really BIG ! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ztt76mO3zu8.html

@93corollausa94 2 года назад

there was actually a piston aircraft engine from the 50s that did that

@pinkdispatcher 2 года назад

@@93corollausa94 I'm a bit late to the show, but the German experimental high-altitude research plane Grob Strato 2C (en.wikipedia.org/wiki/Grob_Strato_2C ) actually did that, as well. It used the gas generator of a PW127 as its first stage turbocharger. Lots of problems with it, but it did break the absolute altitude world record for piston-powered manned aircraf of just under 61,000 ft.

@williamchamberlain2263 Год назад

@@Iowa599 use the bypass ?

@Tinman97301 2 года назад

I operate a very old power steam plant. every time we get a new person in they say the same thing "I'm going to stream line this place" and my question to them is always the same. What are you going to do that hasn't been though of in the last 200 years? It's amazing how much humanity has forgotten in the last 50 years 🤣 we use the things we use because a lot of very smart people spent a lot of time making it.

@KR4FTW3RK 2 года назад

I'd love to hear more what kind of plant it is... I've got so many questions.

@DScottDuncan 2 года назад

Hi Jay and thanks for the shout out!

@grahamj9101 2 года назад

On the subject of of the practicability of designing and building a small axial flow compressor, AgentJayZ pointed out that, in scaling down the aerofoils from, say, something as small as an Allison 250 compressor, the profile tolerances would ideally have to be scaled - if that were even a practical proposition. Beyond this, it would not be possible to scale the aerofoil dimensions, as they would become far too fragile. I have met members of the Gas Turbine Builders Association at the local Model Engineering Exhibition in the past. One of them has regularly shown his little engine, which has several axial stages. However, the last I knew, it had never actually run. Even the manufacturers of full-size gas turbines can get the design of a compressor wrong. Back in the 1980s, R-R had a 10-stage rig compressor that, in its day, was world-leading in terms of pressure ratio and efficiency. It underwent a major redesign , to scale it for the V2500 engine, together with some aerodynamic 'improvements'. It didn't work: either the efficiency was good, with poor surge margin, or the surge margin was good at the expense of poor efficiency. The solution was to un-redesign it, which had to be done in a matter of weeks. My team at Bristol did so, working 12-hour days, seven days a week. It worked first time.

@williamlawson4209 2 года назад

Good one. Many people don't grasp the millions of hours that have gone into designing one of these machines. Design your application; acquire the pieces to make it work.

@scottminshall6420 2 года назад

Great Shirt! You are correct on Nene 10, it has 9 cans on it. I think you did a great job of answering the question.

@Sjapilot 2 года назад

My gosh. This guy. So much opinion. All at once. And all completely reasonable.

@CharlieSolis 2 года назад

Facts

@dachlatte 2 года назад

It's almost like he knows what he's talking about :)

@dodaexploda 2 года назад

1) nice shirt. 2) thanks for the video. 3) I totally now want to build a small RC jet engine. It doesn't need to be good, or optimized. It would be a fun thing to attempt to figure out.

@aidenbramer1157 2 года назад

19:24 Agreed with one exception: it was fun. (Cool looking flamethrower too.) Glad to see you still making videos, AgentJayZ. Keep it up!

@thomasbaumgart9209 2 года назад

There are actually a few working DIY axial turbojet engines, here's an example: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-pXDNMv9t990.html It's truly amazing how much effort went into such units until they self-sustained at all. All the tin can units are a bad joke and anyone pretending these devices actually run a self-sustaining brayton cycle is a liar. The simpler radial/axial model R/C engines are meanwhile pretty reliable. Their short overhaul periods are basically related to using the "wrong" type of bearings, which are chosen due to the simplicity of their lubrication system. They utilize a total loss lube system with a little oil blended into the fuel and this mix metered to the bearings. These bearings are full-complement (cageless) hybrid angular contact types with silicon nitride (ceramic) balls and steel races. The problem is the balls aren't separated from each other and contacts between the balls tend to cause local heating and surface degradation which eventually leads to pitting, noisy running and finally failure. The use of unflitered air for cooling of the bearings speeds up this degradation process. A proper, closed circuit lubrication system along with bearings with cages would prolong the TBO of these tiny engines considerably. On the other hand, these "primitive" R/C turbojets are surprisingly powerful. A thrust/weight ratio of more than ten isn't difficult to achieve at all, especially with the smaller units. But they are thirsty little beasts, with TSFCs easily twice as high as their ancient role models. The reason that it isn't possible to just scale down an existing (axial) engine to get a running small turbojet isn't so much the tolerances but rather a thing called the "Reynolds numbers" involved in scaling aerodynamic contraptions. To explain it in simple words, these numbers describe the tencency of fluids to seemingly become more and more viscous the smaller the dimensions get. The air simply doesn't flow as well around a small airfoil as it does with a bigger one. That's also the reason a bumblebee can actually fly, though from the insect's point of view, it's more like swimming or diving through the air. A bumblebee scaled up a hundred times wouldn't be able to fly the same way since it's not been designed for that kind of aerodynamical Reynolds numbers -- just look at the way birds are "built" ;-).

@0623kaboom 2 года назад

yup the last part is so true ... you have to account more for corriolis and bernoulli the smaller you go ... and not just have it the back of the head and check it once in a while ... but actually have it in the calculation ... and thats where stuff gets interesting ... not to mention very very complicated ...

@julybliss4440 2 года назад

Comforting to hear an expert weigh in on exactly all my concerns with diy builds. Yet I still dream trying or modifying all the mentioned attempts (turbo charger, soup can, etc.) Until I get my retired engine or even pieces to play with or admire. You literally killed my dreams and bucket list but gave it a healthy reality confirmation, whether I end up choosing to burn up a soup can, $, and time (especially in fuel system) or spend that time and energy on a old restoration, it's nice to know my thinking was of your level with regards to efficiency and conceivably done with one person on diy design and such. And more hope I can find a older gas turbine for the mentioned 5-6k which is more conceivable than the 10-12k min I can only seem to find for sale. As long as it's sounds like a gas turbine I'm taking it lol. Don't care if it was decomisioned from leaky nuclear icbm. And before someone tries to get kiddy NO I DONT WANT TO SIT BY ANYMORE TORPEDO HEATERS. PROPANE OR KEROSENE.

@grahamj9101 2 года назад

Would it be possible for one person to design and build a jet engine? Yes, if it is small and as simple as possible: in other words, a home-built version of the commercially available small turbojets for R/C models. Someone has already mentioned Kurt Schreckling's book, 'Gas Turbine Engines for Model Aircraft', of which I have a copy. I also have a copy of, 'Model Jet Engines' by Thomas Kamps. I think that they are both long out of print. I had ideas that, in retirement, I might build an engine to one or other design, but found myself taking up sailing instead. I also became a STEM Ambassador and a grandpa. I must mention that Schreckling made his little centrifugal impeller from plywood, with its periphery wound with carbon fibre to stop it flying apart. Such models can only last for tens of hours, at best: typically, the commercially available models are only good for tens of hours before needing an overhaul. I nearly bought one at a 10percent discount a few years ago, to use as part of my STEM Ambassador activities: but I then thought that I could make better and more enjoyable use of the equivalent of around USD 2,500, such as going to see my granddaughters in Singapore more often. Would I recommend even trying to embark on a home-designed and home-built engine? Honestly, no. It would need a lot of study to get up to speed with the necessary theory, if it wasn't part of your training and background. It was part of my training and background, but I didn't relish the amount of revision that I would need to do, followed by all the work needed to make and build the thing. And all for what? For it to last just a few hours and, quite possibly, fail spectacularly.

@0623kaboom 2 года назад

LOL lots of study ... oh so much study ... 15 years of the last 22 has been dedicated to doing just that designing the iroquois ps13 MK II (yeah I cheated I had a pre worked starting point) but still I enjoy the impossible ... as it only takes longer ;) ... and besides I got nothing else to do with my time but watch you tube video's play games or go crazy with lockdowns and Prime minister Justin Castro trudeau ... and yes we are still effectively in a state of emergencies measures act ... he never rescinded it he only lessened its scope ..

@dougaltolan3017 2 года назад

I once investigated the design procedure for an aircraft propeller. "The equation" has 9 parameters, including engine power, rpm, air speed etc. It's a balancing act that is no mean feat. To simultaneously do that for each stage of compressor and turbine, while including combustion properties is why its a long, long team effort.

@0623kaboom 2 года назад

and it gets worse the further down the engine you go .. and once you have made the first pass you have to take all those calculated values and reenter them into the calculation and do it again ... and take the mean difference and figure out your error ratio ... and decide if its too large or not ... and then do it all again until you have made all the compromises you had to ... and got the result you can be happy with ...

@Jan_Seidel Год назад

Thumbs up for your shirt and the boldness of the soldiers on Snake Island 😁

@voytekcyvr1936 2 года назад

Great opinion!! (The Stamp) Yes, I share your idea that is a great satisfaction to bring some old engine back to life. If I have unlimited time and money I would love to restore some WW II aircraft.

@AgentJayZ 2 года назад

You may want to visit Planes of Fame in Chino, California. Right there is a restoration hangar called Fighter Rebuilders. You can go in and talk to them.

@fatkorn 2 года назад

I built mine outta paper towel tubes an old yogurt cups, don't worry it's all wrapped up in safety wire.... pipe cleaners, zoooom!

@robertthurman3743 2 года назад

This is the best description I've heard for why the little ones are cost-prohibitive. Referencing a 30-year-old motorcycle magazine article by Kevin Cameron, he explored the future use of small turbines powering generators for hybrid engines in over-the-road trucks and buses. This 30-yeard-old article was pretty much referencing our present. He said battery technology wasn't good enough to drop fossil fuels all the way. His comment talked about potentially using very small turbines that spin at consistent speeds to power only generators/batteries to run the vehicles, extending the range. Today as I see the Rivian R1T and the Tesla Cybertruck with their 1000 hp motors but only limited to around 300-400 miles max, I think back to that Kevin Cameron article about small turbines powering the battery banks of hybrids. I've often wondered why small turbines haven't found their way into these short-haul hybrids like the trucks, especially when I see the RC-sized turbines. Now I know. Thanks, Jay.

@CharlieSolis 2 года назад

Working on that right now in fact. There’s a HUGE market for micro gas turbine electric generator augmentation of electric vehicles. We should have been running our cars like this the whole time. Operating at peak efficiency performing RPMs and then just send the power by wire to electric motors on each wheel. Sooo much weight reduction and overall rotating mass reduction too from not needing the whole drivetrain. Just imagine how much lighter they will be without that battery pack these cars are sporting.

@jinglebombs3 2 года назад

Well... I'm going to take this as a challenge. Stay tuned for the video. 😉 I found your channel when researching similar things btw. I enjoy your videos. Keep it up!

@ImFromIowa 2 года назад

Make a video of your progress. To ensure that he sees the video. Show the doubters that you *C A N* make a turbine jet engine out of junk/ scrap yard materials (or 3D printed, of course wisdom is key to a successful 3DP a jet engine).

@N330AA 5 месяцев назад

Some of those turbocharger turbines are made from Inconel and are rated to up to 950c, and some are made from Mar-M and can go slightly higher. I've been thinking about designing hopefully one day making a turboshaft engine out of turbochargers that would turn a 20-30kw electrical generator - as a range extender for a hybrid-boat! If you had a good enough heat exchanger to allow for significant recuperation you could in theory get some decent thermal efficiencies out of them, even though the turbine and compressors themselves only have around a 75%-80% isentropic efficiency.

@jrow8694 2 года назад

Well said. I laughed at machine the compressor.

@JasperFromMS 2 года назад

Another excellent video. I think you've hit on this in the past, but it's one thing to design a compressor, combustion chamber and turbine; but it's quite another to actually manufacture them. One person (or team) may design the components, but another person (or team) has to design the machines to manufacture those components. I'd like to see you address thd different processes that are involved in the manufacture of the components: "these blades are cast," "this shaft is forged and machined," "this liner is stamped and then heat treated," or whatever. My guess is there's not a single factory that makes everything. Again, you videos make for understanding which leads to appreciation.

@AgentJayZ 2 года назад

Thanks! Your first name is a park in the Rocky mountains, with huge peaks and glaciers. When I crossed the Mississippi, I was impressed with how huge the river was, and how flat the land was. My tiny mind juggles those two images when I read your name...

@JasperFromMS 2 года назад

Ha! I understand that Jasper, Alberta, has THE BEST National Park as is befitting it's name. Also, my state is indeed very flat. The highest point in the State of Mississippi is 800 feet and it is 300 miles from the beach. (Google says that's 244m and 484km.) So that's flat.

@survantjames 2 года назад

I can’t disagree with anything you said, but I do take it as a challenge! Cheers!

@CharlieSolis 2 года назад

Yeah buddy! Make waves!

@oscarverwey 2 года назад

Execly challenge exempted

@jhyland87 2 года назад

thanks for this. I see a lot of these and I've always thought calling them jet engines was a bit of a stretch.

@waterlife.1905 2 года назад

I like your t shirt.

@thomasfsan Год назад

I wonder if it's possible to build, as an experiment, an incredibly SLOW jet engine? Imagine a glass venturi tube, with an electric heating element in one end, and an extremely lightweight turbine and compressor.. It would be more a science communication tool than anything useful ofc. I guess the question is, could a slow engine work? Or is it something about the speed and high pressures that are absolutly required for the concept to work. It's something that could be beautiful, and maybe useful for understanding if people could see the airflow, with smoke for example.

@rtwas 6 месяцев назад

Lots of folks can, and have done diy turbines from scratch. Some do *everything*, some use pre-fabricated compressor/turbine wheels from china, some convert turbo chargers. This stuff is all over youtube. My exception with such questions to AJZ is that there is a wealth of documents online on turbine engine design. One design document I found is 691 pages and quite extensive in coverage of turbine engine design.

@AgentJayZ 6 месяцев назад

My opinion is that no human being in history has ever built a competent gas turbine engine on their own. Competent means matching or coming anywhere near matching the performance of any commercially produced engine.... otherwise it's a model, or a toy. You may think Frank Whittle or Has von Ohain are exceptions, but they had teams of engineers and technicians helping them create even their first running engines. Also, calling a turbine engine a turbine is one of the most common mistakes made by people who don't really know anything about them.

@henriquesian3437 11 дней назад

@@rtwas Hy man, can you tell me the document reference (or title if it is a book)?

@rtwas 11 дней назад

@@henriquesian3437 "Aircraft Engine Design Second Edition.pdf". This will keep you busy for a while.

@rtwas 11 дней назад

@@henriquesian3437 And here is another one: "GAS TURBINE AND JET & ROCKET PROPULSION1.pdf"

@rovhalgrencparselstedt8343 Год назад

When you say the Gloster Meteor, i only remember it having the Derwent engine, unless that was just a different name for the same engine.

@AgentJayZ Год назад

You are correct. The Meteor did not have the Nene engine.

@jrnmller1551 Год назад

@@AgentJayZ I think it was the Vampire that had Nene!!

@icojb25 2 года назад

Thermodynamically the automotive turbocharger builds are identical to the machines you find in industry. From that perspective, they're really good for teaching engineering students. In terms of radial vs axial compressors, the issue is mostly mass flow (flow coefficient). Engines with lower mass flow requirements generally used radial compressors because most of the time its easier to design a radial compressor but more importantly the pressure rise per stage is much higher for a radial machine than you can typically get out of an axial machine. You'd need at least 3 or 4 axial stages for a single radial stage. For these reasons its much better to use a radial machine for lower flow machines. The big issues you have with radial compressors is - engine diameter, higher stresses in the disk for similarpressure ratios and of course the gyroscopic effect of having a large spinning disk under the wing ... In the old days, everyone wanted high velocity jet thrust (even though we know this is now not best), so development was naturally towards axial machines. Awesome and really cool video of course

@Jan_Seidel Год назад

Another issue regarding the size of an jet engine. The smaller, the harder to make it run and reach selfsustaining idle.

@andrewselberg649 2 года назад

Charlie Solis’ design is a Tesla Turbine though, not your normal jet turbine type. He’s going for energy production not thrust. Might be even harder to have designed a much lesser known type of turbine.

@mattsberggren2233 Год назад

love your shirt and your vids are fantastic

@onedaya_martian1238 Год назад

Thanks soo much AgentJayZed for entertaining these questions and providing such insightful answers !!

@dtiydr 2 года назад

Thumbs up for the T-shirt and the video.

@midwestreview6382 Год назад

Would love to c you do a video on building a turbo charger jet. Is it practical no. Useful no. Sounds cool yes. I only want to build one to put on a riding mower it would be a bonus if it moves under its own power

@todddembsky8321 2 года назад

Sorry Secret AgentJayZed (of her secret aeronautical service) the only jet engine that I ever created was closepinning cards to the spokes on my bike. And people wonder why an RC Turbine Engine starts at $7000 and goes up from there. And produces up to 5 pounds of thrust at full power. They do produce extremely wild balls of flame when they return to mother earth in an uncontrolled manner. I do think that a 3d printed compressor section would make a great blender for Margareta's. I personally think that non commercial turbines run best on CC Whisky, hot days, and chairs on the beach. (the fuel here is consumed the the chair occupant.) We let the real AgentJayZed's work on the real Turbines.

@gordonlawrence1448 2 года назад

Wren TS45i is way cheaper than that.

@Squodgamullis Год назад

Re. scaling down a large engine design: if I'm not mistaken, leaving aside the issues of increased precision and tolerances, an exact miniature still wouldn't work well since the fluid dynamics of air remain the same. I.e., factors such as the speed of pressure waves in air don't scale, meaning that a small turbine design would require a design optimised for its size. I'm happy to be corrected though.

@AgentJayZ Год назад

Correct. Because of this, the precision required when manufacturing parts for a smaller engine is greater, making the process more expensive. This is a big reason why you don't see variable stator, multi-stage axial compressors used for turbochargers. Even the smaller aviation gas turbine engines are less efficient overall than the big ones. Their design is simplified to allow manufacturing costs to remain reasonable.

@VovelPunch Год назад

nice t-shirt👌

@mp6756 2 года назад

I am confident I can design and build a multi stage jet engine My wife has a really nice hair dryer and a Dyson vacuum cleaner and my son has a fan on his nightstand so that is stages 1 2 and 3 I am planning to use my Coleman lantern bags for burning the fuel. I'm going to use pump gas so I can avoid having to buy so many sterno cans like my last jetpack.

@0623kaboom 2 года назад

first ... the lantern bags wont work well at all ... they will retard and restrict the flame at speed ... the hair dryer and vacuum and fan ... all will work as a visual working piece of art BUT not too well as a jet engine ... plastic being the biggest reason ... to much flex not enough heat dissipation ... to low a thermal thresh hold and poor center contact surfaces ... and pump gas ... at say 97 octane ... if you got the plastic fans to work well ... would need to be about 1 foot in front of the flame chamber... essentially removing all the compression you achieved .. . all in all you would be better off making a soup can engine and only run it on butane as a show piece ... cuz Titanium aint cheap ... and aint easy to work with ... and aviation grade titanium sheet or blocks is even more expensive as it has to be near perfect so yep ... acoustic testing of the raw material for defects to work around .. (think $1,000 each piece) . a throw together engine like most people show on youtube is nice for a personal proof you can make something do what it wasnt designed to do ... and work for a time ... but an actual working jet engine .. even a model rc engine ... still involves several thousand hours of math work before you even get it off the paper ... and test it in the real world for the first time ... which never works perfectly anyway ... so 10 to 20,000 hours of work on paper before you have anything you can actually put a finger on ..

@ericsills5290 2 года назад

Have you seen the turbine generator on a detroit dd15. It connects to the gear train of the engine and supposedly supplies up to 50 more hp to the engine.

@AgentJayZ 2 года назад

I have not, but I am reminded of the Wright Aero Engines R-3350... Two row, 18 cylinder, air cooled radial. Yeah... three thousand three hundred fifty cubic inches. I might be a turbine engine guy, but I love saying that! A later version, called the R-3350-TC, for Turbo Compound, had 3 turbines in the exhaust, similar to turbocharger turbines, but they were directly connected by reduction gears to the output shaft. I think they added 450Hp to the total output, making it over 3,500 Hp. We actually have two in our back yard. Each of those Power Recovery Turbines weighs over fifty pounds.

@AP9575-jd 2 года назад

Never underestimate a determined man or woman AgentJayZ.

@infidel6347 2 года назад

It will turn on but what it do ?

@AgentJayZ 2 года назад

Anthony... I am not saying it can't be done, but I am saying that never in the history of planet Earth, has it been done.

@TeemarkConvair 2 года назад

100% with you re; the great shirt. von Ohain had a team, Whittle had a team, Neumann had a team..

@Marr_SC 2 года назад

Formula 1 in recent-ish years has done a great job of progressing turbocharger technology. For example, (even though I'm a Tifoso/Ferrari fan) Mercedes pioneered separating the compressor and the turbine halves of their turbocharger... One half at the front of the engine, and the other half at the rear, with a shaft in the "V" of the engine connecting the compressor and turbine.

@AgentJayZ 2 года назад

So... longer shaft and shorter ducts. Amazing. Oops, left the sarcasm button on.

@Marr_SC 2 года назад

@@AgentJayZ - No need to be mean, sir. I love your channel and I can honestly say that I've learned a lot by watching your content. I especially love the lock-wire videos... So I'm not going to argue with you because I'm definitely out of my league here. All I'm saying is that F1 teams have dumped hundreds of millions of dollars into trying to get every bit of performance out of their engines (within the F1 regulations), and the split-turbo was something that Merc pioneered and everyone else copied... Probably for a reason. Thank you again for the great content.

@Justice-Seeker 2 года назад

@@Marr_SC It seems, if you look into the history of their invention, Mercedes were inspired at least in part by turbo jet engine designs. In fact, the engine Agent J used in this video might just be one of the designs referred to by the Mercedes engineers when talking about where they got some of their ideas as they referenced helicopter turbines specifically. Note, I did not do more than the most basic of research into the subject being curious about Agent Jz' reply so this could be completely coincidental.

@rodneytrynor7374 2 года назад

thumbs up for the shirt👍

@stevenwynne4041 2 года назад

The development of a gas turbine engine is a mix of thousands of compromises by a team of hundreds of engineers. No one person can duplicate what hundreds of engineers do. Even Whittle had the concept but had a team of engineers. In my opinion, the entire focus is temperature and bearings.

@0623kaboom 2 года назад

sure they can ... they just cant do it as fast is all ... people forget ... all anything takes is TIME ... if you have the time you can do it ... . 1 person can build a house completely ... but 40 people can do it in a few weeks while that one person may take a year or two ... . just because many minds make it faster doesnt automatically mean it is NOT possible for one person to do the same thing ... bake a cake or make bread ... 5 people doing the same job doesnt make it better ... and actually that many actually make it worse ... while 1 person has the ability and time to make it perfect or as close to perfect as they can ... sometime too many cooks spoil the recipe ... but also many hands make for lighter work loads ...

@arturoeugster2377 2 года назад

Take a look at a T62 made by Solar in San Diego, no jet engine but a 80 kW turbo shaft. Like you said no turbo charger. Has a well designed fuel controller.

@jonpardue 2 года назад

When "home made jet engine" comes up, link this video. This video will stand the test of time.

@C-M-E 2 года назад

Speaking to the general audience here as someone who built two from a S400 compressors and adapted jet engine parts, there is at least one thing that one can appreciate after the experience of repurposing, re-engineering and making the whole thing run, which is the absolute precision and mechanical beauty of the Real Thing. For me, mine was more target-based as a scientific pursuit for material testing future composite applications of extreme temperature resistance, and using turbo components was (initially, before you open up a money pit!) the most cost-efficient way to get there. I still had to machine parts, relearn CAD, become an expert in metallurgy, chemistry, 3D printing, welding somewhat exotic and extremely expensive metals, wear out my library card, read thousands of white papers, engine schematics, and tons of old threads on the JATO forum to understand the principles of how and why jet engines are designed the way they are to do every process they perform. And the small time investment of several years, but there were, let's say, setbacks... In the end, I had two functional 'jet' engines, but very quickly you will figure out how Inefficient the use of turbo parts are to getting any semblance of acceptable performance. At best, you'll be looking at PR's of 4-1, gobbles up LOADS of fuel, time and money if you intend to really do it right (and safely). Also be prepared for a lot of awkward engagements at the hardware store. That's not to say you won't meet some very interesting folks on your journey, certainly more than a few who will guide and/or correct your path. One such fellow I came across here on RU-vid who ended up building perhaps the creme de la creme of turbo-based engines is Praendy. His channel is chock-full of his trials and tribulations to building and running his exceptionally nice engine(s), and there's a lot of lovely afterburner work in his later efforts, because who doesn't love that?!

@AgentJayZ 2 года назад

Thanks. Your activities is not the subject of this video. The subject was designing and building an engine completely from scratch, as a hobbyist. My response was that is an impossible task. I think what you have done is a great project, and my original commenter that I am responding to in this video should consider following your lead.

@C-M-E 2 года назад

@@AgentJayZ I gotcha man, no worries. One caveat I would add is that making a *hobby-grade jet engine (that has no conditional merit other than personal satisfaction) from scratch can be done by one person start to finish, but there's a lot of asterisks attached. You'd need to be an engineer, a chemist, etc, have access to 3D printers and feed materials of industrial capacity, nearly unlimited funds and time... (you see where I'm going) Commercial engines, on the other hand, 1000% agree! Getting a completed engine through the red tape of airworthiness and all certifications on its own, as I understand it, can be a decade-long affair all by itself.

@0623kaboom 2 года назад

@@AgentJayZ not impossible ... but close to life long ... the arrow was 340Million man hours before they even built the wooden mock up ... and what 20 some test models ... . it IS do able ... just not very fast or efficient ... same as refurbing an engine ... do it ALL yourself takes forever .. when you have some help it takes less time ... one has to decide is their time worth the effort or not is all ... and if it is to be commercially available then you better get help because 1 person is NOT cost effective . as a person doing just as this video covers ... I cheated a bit I started with a designed engine ... and am working UP from there .. the ps-13 sitting at the aviation museum in Ottawa ... handy being able to walk down and snoop it over like a hawk ... impossible NO impractical sure ... but fun if you have a choice between go stir crazy or do something to keep your mind busy and active ... and who doesnt like to learn and understand new things ... . Heck Jay your first engine you ever worked on that you never had seen before or touched ... it was not easy to work on BUT it had all the familiar bits you were trained for ... didnt make fixing it impossible ... it just took longer is all ... after the 5th or 6th one I bet it's like making a PB and J ... old hat ... same with scratch design ... it just takes longer as 1 person .. BUT can be done

@justcarcrazy 2 года назад

The PT6 turbine engine family all feature radial flow compressors. Those things span outputs from 500hp and 2000hp.

@AgentJayZ 2 года назад

Like the Allison featured here, the PT6 has an axial boosted centrifugal compressor. 4 stages axial feeding the centrifugal.

@scottthomas5999 Год назад

They don’t know what they don’t know. Good video.

@steveshoemaker6347 2 года назад

Thanks AgentJayZ....Amazing fun video.....Shoe🇺🇸

@carpetbomberz 2 года назад

So happy to see the Allison 250 again. It's been a while.

@albertorossetti5375 2 года назад

I love your shirt 👍

@will891410 2 года назад

Once i tried to build a Buran at my backyard and i couldnt even start with the project.

@SebaSpeed 2 года назад

it would be very helpful to have subtitles for non-native English speakers (me e.g.)

@AgentJayZ 2 года назад

My channel attempts to cure a lot of confusion the general public has about a fairly technical subject. The RU-vid subtitle generator is so inaccurate that the results are misleading, and only add to the confusion. So subtitles are not available.

@LastBastionLabs 2 года назад

I have been a fan of the channel for years. Love your work. Turbine design begins with a thermodynamic analysis of the Brayton cycle. Until a designer can quantify their design in terms of changes in enthalpy and entropy, they are wasting everyone’s time. A basic analysis could be done by a single person, and I would not discourage anyone from that opportunity to learn. After that I agree, it will take a village. LOL

@sharg0 2 года назад

The ignorance from people that lacks even the basic knowledge of most topics that causes them to think "oh that is simple" is infinite... I've manufactured parts for gas turbines (including materials like inconel and hastalloy), I grew upwith jet engines since my father was an engineer working with them, I got a bunch of books on the topic, I've had a cut through image of one on my wall as long as I can remember... To make my own engine from scratch? That's as likely as me being a brain and heart surgeon.

@someoftheyouse 2 года назад

I have been down this road. I have Bachelors Degree in Engineering, I bought £200 worth of books RE turbine engine design. I've done the math (100 pages of calculations and several spread sheets), the geometry of the blades is absolutely critical and devilishly complex. The performance of the previous stage has a knock of effect to the next stage and the blade geometry must reflect that to achieve the kind of efficiency needed just to make the engine self sustaining. To prototype and build one solo you really need a 5 axis milling machine (approx £150k for a basic one) and thousands worth of high nickel alloys, aluminium and stainless steel raw material. That was the end of the project. Although we are potentially getting a 5 axis mill at work, so I might have to get the project file out again....... If you don't have that level of capability at your disposal, FORGET IT. You are not the mad scientist you think you are. The limitations are real.

@CharlieSolis 2 года назад

You can get a 5 axis stainless steel cutting capable cnc that runs on Mach 3 for under $10,000 now. It won’t be huge nor have all the bells and whistles but if you know what you’re doing you can make it work.

@CharlieSolis 2 года назад

Cool though. I’m glad I fit your bill of “mad scientist” 😈

@CharlieSolis 2 года назад

I’m still honing in my 4th axis cnc learning before jumping up to 5axis

@83abhinavnigam 2 года назад

@@CharlieSolis what is cnc ?

@CharlieSolis 2 года назад

@@83abhinavnigam Computer Numerical Control (CNC). Basically any computer controlled or automated manufacturing machine. 3D printers are a form of CNC machine. You can either hand program the Gcode like the old timers still do… 🤯… or learn some CAD program and a CAM package to help you generate your tool path gcodes based off of your CAD files.

@sighahnyde2215 2 года назад

Sounds like the Dunning Kruger effect to me.

@mattkaczorowski3099 2 года назад

I was coming here to say the same thing! It's a perfect example of not knowing what you don't know. I loved the detail of this video on explaining how they need to maintain the speed of the air through the compressor and of course, at different densities! I totally did not think of this before.

@MrCzarnm 2 года назад

For single person RC turbines are way to go. From 400N turbine kit you got engine like RR Dervent in principle with PR 3,8:1 with T/W ratio about 8-9:1. Keep in mind that to DIY engine from a kit in comparison to retail engine price is 3:1 ratio. Full design and manufacture is more than 10:1 ratio. I partially agree with AgentJayZ that in general are toys with great educational value - principle of operation, technology and manufacturing. Some of that micro turbines are useful for drones, missiles - AWP programm, decoys. Even in machine that paints white lines on a roads micro turbines are used to dry asphalt. I work with large engine up 20 kg/s. I just build and design micro turbine for my education and experiments and it is in a budget that is acceptable. Nature of centriugal, areodynamic and axial loads are the same with larger cousins.

@tiberiusvetus9113 2 года назад

Nice shirt.

@matz6425 2 года назад

hey hi, i have a question, i saw that in the KJ-66 rc jet engine, actually in all of them, the shaft has a spring, which I believe it's called "preload spring", but my question is why is there a spring? p.s. nice video new subscriber

@AgentJayZ 2 года назад

I have no experience with RC engines. I consider them models, and toys. They don't come anywhere near the service requirements of real turbine engines. I can't help with any description of them.

@matz6425 2 года назад

@@AgentJayZ its ok, still thank you very much for taking time to respond my question

@mattie22011 2 года назад

I made a potato cannon with pvc tube and a grill ignitor once from a RU-vid video

@AgentJayZ 2 года назад

Propane, or gasoline vapor?

@mattie22011 2 года назад

@@AgentJayZ carburetor cleaner haha

@MrBen527 2 года назад

30 years ago as a kid the potato cannon was my first real build project. I used a flint lantern igniter and propane.

@AgentJayZ 2 года назад

Range is the main requirement. When I was 15, I build a slingshot with 40 feet (!) of surgical tubing and a funnel. It required a crew of three, and fired water balloons. Useful range was about 200 yards. At the beach, one guy was so mad at us barely missing his wife that he came after us. We watched him until he got tired and started yelling.

@MrBen527 2 года назад

@@AgentJayZ Ah yes! Those are fun also!! 😄

@jrnmller1551 Год назад

Why do people think they can do this in their shed or Garage, when GE/RR spending billions in enginering to developing just a better engines, not new engines, Thanks for trying to make it clear, that if you wanna play with this you are talking serious Dollars, and not worn out 50box turbos!!!!

@robc3056 2 года назад

Hey we did but it aint ever gonna fly just makes a superb racket and sits under the bench in the garage me and 2 mates a weekend project many many weekends lol took ages to get burner right so it wasnt burning in the turbo must get it out again bloody good fun.. beer and colin furze inspired..Do not turn the propane bottle upside down thinking that your all big and clever and that it should be fine running on liquid...

@EricTViking 2 года назад

The perfect T-Shirt doesn't exis...

@grahamj9101 2 года назад

Did I hear you say "radial outflow turbine"? Obviously a slip of the tongue: you really meant to say "radial inflow turbine". 'Centripetal turbine' is also an acceptable term. Another slip was to suggest that the R-R Nene went into the Gloster Meteor. It was too big for the Meteor, but it was scaled down to become the Derwent V, which powered later marks of the Meteor. The Nene had limited use in the UK, powering the Hawker Seahawk and Supermarine Attacker. However, it was built under licence as the P&W J42, which powered the Grumman Panther. It also powered the Canadair Silver Star. Infamously, it also powered the MiG-15, having been reverse engineered and developed by Klimov as the VK-1. This engine was based on a batch of Nenes that had controversially been sold to the Soviet Union, as a gesture to a wartime ally, with the proviso that they were for civil use only.

@AgentJayZ 2 года назад

Yeah, I did get that wrong. I was not aware of the Derwent in the Meteor. On my trip to Wisconsin in 2019, I got to ride in a Nene-10 powered T-33. I was very interested in the instrument panel during startup.

@EricTViking 2 года назад

More specifically the Nene was sold to the communists by the socialist Labour government of the UK. The USA was not impressed.

@NBSV1 2 года назад

This makes me wonder if you could couple 2 of the compressor sections from a turbo together and get 2 stages of compression. Would still take a lot of fiddling or math to work out how big the compressors and the turbine would need to be for it to really work right. Often it’s not that hard to make something that turns fuel into noise and fire. Gets much harder to really extract usable power out of something.

@rondesilva3077 2 года назад

there are engines with two centrifugal compressors - they say more than two becomes problematic

@0623kaboom 2 года назад

the answer is YES ... the reason why it's not often done as a DIY version ... is surge ... they never work as intended and tend more to surge one stage and then the other or both at the same time or neither ... making them ... as jay said ... not very useful beyond seeing if you could do it ...

@adamt5986 Год назад

Man Jayz you’re crapping all over my Supra aftermarket turbo business! Kinda funny the Supra engine was named after you or was it the other way round?

@stefanoconti4426 2 года назад

Outstanding!!

@johnlauer4550 2 года назад

Sir, first I want you to know your an inspiration and a damn good teacher. I agree with you completely about turbocharger hacks. I also took your advise and went through 5 different texts plus I subscribed to a couple of educated amateurs as a cross reference. Then I bought a Williams APU and made it run. Then 4 years ago I started building my own axial flow gas generator. I’ve went through 3 redesigns and I’m getting close to the first light off attempt I’ve designed an electrical delivery fuel at 125 lbs per square inch, I used mild steel for compressor stages and I ceramic coated them. It’s 7 stages high pressure and 3 stages low pressure. I’m making the turbine disks out of iconical steel with cold rolled steel spools( yes 2 spools)I will send you pictures of everything and your rebuild of the Irene’s 24 is what I’ve used as my model , you will know me by BubbaJ173

@amirhosseinbozorgi1935 2 года назад

to dear agentjz could you pls make a video dedicated to building and performance of pulse jet engine? thanks

@AgentJayZ 2 года назад

Nobody builds them, and nobody uses them. I try... I try to stick to the real stuff that I work on.

@oscarverwey 2 года назад

@@AgentJayZ well this guy build's Them m.ru-vid.com , even I have a simple en cheap replication of a part of his system m.ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-iltgTwZYOzM.html , please check it out en let me know what you think

@francisconti9085 2 года назад

@@AgentJayZ Actually some do, but @ expense of hearing & safety..essentially a pulse-rocket? I heard one ONCE..DEFINITELY feel it. Safer on RU-vid!

@rthefish 2 года назад

Gas Turbines for Model Aircraft by Kurt Schreckling

@dmytropashko8209 Год назад

I like your T-shirt!

@cptlucian2908 2 года назад

Hello how are you love your videos, here is my view on this designing a scale model jet engine is not that complecated by using a sectional reference image online you can use a cad software to design a replica that could be scaled to any size to feet a model aircraft like an rc b777 which am working on at the moment.

@stefanbehrendsen330 2 года назад

Well, I'd say we are closer than we ever have to that being a possibility. True, the engineering of a new design and making it reliable is no mean feat, especially if it needs to be rated airworthy. High end metallurgy via powdered metal sintering and precision machining are getting closer and more obtainable to the consumer. I guess it depends on what you want it for. Bladon's micro gas generator turbine is essentially a single stage turbine engine quite similar in design to a turbocharger. 12kw is quite small, but the principal is sound. Really, what's out of reach of the consumer is the high efficiency and high reliability reached after hundreds of thousands of man hours. No one's going to be flying on a homemade engine any time soon. There's are a reason why there are few truly new turbine engine designs, instead most are iterative improvements or reconfiguration.

@AgentJayZ 2 года назад

Ok, then... I'll put you down for a solid yes, and also a solid no. Check!

@RodrigoRodriguezowl Год назад

Yep when it comes to lifetime for precision machines and other important machinery life hours can easily get to many many many thousand hours

@MrBen527 2 года назад

Yes! Great shirt!

@DougHanchard 2 года назад

Good grief... 1) AgentJayZ is 100% right 2) Don't argue with point #1 3) If you ignore point #1, be prepared to be seriously injured (possibly fatal). Protip; watch this video 50 times to make sure you remember all 3 points.

@0623kaboom 2 года назад

4 anything is possible ... IF you are willing to put the time in to do it ... so far 15 years an counting ... and Im still only at best 60% of the way through the design ... and NO virtual testing as of yet .. and no tweaking .. so in about 15 years more when im about 74 I should be at a point where I can make a mock up lol

@Igbon5 Год назад

I was surprised to learn that a very large cost in Formula 1 racing is paying for computational fluid dynamics. So even using computers to help out with the enormous complexity of fluid dynamics is cost prohibitive. I don't know much about fluid dynamics but I do know that even the wrong amount of paint on the elevators of an aircraft could cause flutter and disaster.

@TDOBrandano 2 года назад

The closest thing to a "proper" turbocharger compressor jet engine are RC jet turbines. These generally have an annular combustion chamber, and there's at least a plane using two of these for human flight. A Cri-cri. Plus a few people using these to sustain flight with a wing suit and some other weirdos using them to control attitude with a jetpack. The main issue with these is generally the life of the bearings and of the turbine, and naturally they are nowhere near as efficient as the full size multi-stage engines are. Incidentally, the early DIY rc sized jet turbine prototypes used a plywood compressor held together with carbon fiber tow, the turbine was cut out of sheet metal with the blades formed by twisting them with pliers, and the combustion chamber was built out of a disposable propane tank from a camping stove. Scary, but they did work.

@TDOBrandano 2 года назад

Btw, seems like some crazy guy still goes the plywood compressor way: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-tEi8c6qseiA.html . I guess as long as you take care never to be in the same plane as the turbine disk while it is running...

@christinadaly7743 Год назад

Just trying to make a Stator Frame for a home made compressor would be a nightmare !

@AgentJayZ Год назад

I have never seen, or heard of any one person, ever, creating a multi-stage axial compressor from scratch of their own design. Almost all home made "engines" use a turbocharger's centrifugal compressor module, and turbine module as well.

@AdmiralCrunch01 Год назад

@@AgentJayZ search up preandy on youtube he's got his own working, built from scratch centrifugal jet engine and its pretty cool!

@khaledyousfi7160 2 года назад

Hi AgentJayZ, please i have a question, it might be out of the object of today but i only can communicate with you in the comments. My question is why the velocity of the compressed air get lowed in the outlet of the compressor, we have proved it today theoretically. Please if you can give me a physical explanation. Thanks in advance.

@AgentJayZ 2 года назад

Why? The compressor works best at an airflow velocity higher than what is best for combustion. In case you meant how, the diverging shape of the gas path acts as an aerodynamic diffuser; it divergent, expanding cross section causes airflow to decelerate and increase in pressure. The lower velocity is more appropriate for combustion, and the extra pressure is a benefit.

@ddegn 2 года назад

I'm sure I'm not the only one who took this video as a challenge.

@AgentJayZ 2 года назад

A mighty challenge, sir. No one person has ever done it before, ever. I wish you luck and success.

@DKTAz00 2 года назад

Been looking for a good excuse to start building that metal sintering 3d printer. And the diy ECM machine for finishing. ( but it wont count, because i didnt invent ECM myself xD )

@drewharrison6433 2 года назад

@@AgentJayZ Personally, I saw another video you made on this subject. From then on, when I thought of a jet engine, I put down the drawing board and started shopping.

@0623kaboom 2 года назад

@@AgentJayZ well since i was 42 I have been doing just that ... I hope to be done before im 70 ... im 57 now lol ... yeah it aint easy ... it aint a short haul ... it aint financially viable for a commercial product ... (15 years at 45 bucks and hour avg of 40 hours per week .. not cheap design costs to recoup) . But the RCR enjoy the impossible .. because it takes a little longer ... less time dealing with brass back home lol

@obsoleteprofessor2034 2 года назад

I'll call it "The huff and puff". There...I got a name and that's a start..hopefully not a torching start.

@forloop7713 2 года назад

Does someone know how to balance the rotor if I build one

@sharg0 2 года назад

It's showed in at least one of AgentJayZ's videos.

@CharlieSolis 2 года назад

Nikola Tesla has a balancing apparatus patent that he got for being able to balance his turbines back on the day. It works really well. I would highly suggest checking it out.

@forloop7713 2 года назад

@@CharlieSolis thank you very much. I will look into this.

@CharlieSolis 2 года назад

@@forloop7713 you’re very welcome! It’s patent US186,799 - “Process of and Apparatus for Balancing Rotating Machine Parts”. I use it for balancing my custom Tesla Turbine Jet engines that I design and make on my own Lol 😇

@TechOne7671 2 года назад

Well said.

@jreid641 2 года назад

I’ve got that same t shirt.

@0623kaboom 2 года назад

yes it is possible to design and build your own turbine jet engine .... BUT ... you BETTER love math ...one pass from front to back in calculations is an equation about 10 feet long ... in something like the orenda ps-13 engine .... if you make a change to any 1 portion ... such as adding an extra air hole in the combustor liner ... then you run that calculation again ... and on each compression stage you run it all the way ... so for 10 compression stages thats 10 runs just for those ... plus 12 stator runs ... plus a run for each air bypass bleed off so you know what air is left to be used to mix first with the fuel ... then thee is the flame ignition ... where it starts and where it should move to once running at nominal ... theres 3 passes for EACH combustor chamber ... and then the restriction before the rear turbine blades ... yup a pass for that and each turbine blade ...and each stator if any and then one for the expansion chamber and one more for the duct at each pressure setting from idle to max ... all in all ... you will run a 10 foot equation about 2,000 times just to get ONE final answer ... then you can make a change .. and yup do it all again ... and if you want to get fancy and have slightly adjustable compressor vanes ... then each vane not only do you need to know the airfoil shape at every point on the vane BUT the attack angle for each level of compression ... and there's how many vanes per compressor stage ... and how many stages are going to be adjustable ... and what limits are they going to move at etc ... . essentially a basic turbine jet engine from scratch has you doing about a years worth of math calculation just to design every bit from front to back ... then about another year worth of virtual testing and then the tweaking begins ... . so yes it can be done ... but you BETTER love your math ... and complex equations and know all your constants .. and conversions ... and material strengths and so on ... . like Jay says the car turbine ... is pretty much nothing more than a .5 to .75 mach capable engine in full scale ... as the compressor just cant move enough air fast enough to go faster ... unless you slap something like an a 380 engine on the side of the single seater plane .. of course one on each side ... and dont forget to balance them too ...

@0623kaboom 2 года назад

nice close up of the compressor blade ... aside from being a constant expanding airfoil it appears to have 3 different airfoil geometries ... one thats really scooped at the middle ... one thats more open around center and the mostly open at the tip ... just to calculate that one blade ... not worrying about its mounting considerations .. is a basic airfoil calculation for each change .. and as it is a small engine ... at least a new calculation about every .5mm from root to tip ... and each one of those calculations must also take into account the shape of the stators before it .. sometimes they can also be varied geometry also ... which means you have to have the numbers for each 0.5mm calculation for stator and compressor and for every operating speed of the engine ... in useful intervals .. so for a 500hp engine .. I would probably expect every 1hp worth of power ... would be a recalculation ... . no small feat ... and a LOAD of math ... now do that for each blade geometery on each stage of the compressor as each compressor stage can use different geometries ... thats an even longer equation ... and as the compression chamber narrows that adds more complexity .. for each side that narrows ... the one shown narrows from the center and the blades appear to also narrow from the top to the bottom ... so a double narrowing chamber ... which is yet another part to add in to the calculation . ... and dont forget as yu compress a gas or fluid it gets hotter .. so you need to know that part as well and have a material that can handle the highest and lowest temperatures possible ... IN the compressor stage ... . look at the little engine ... it appears to be about 4 feet long full sized when built ... so if thats say used in a model arrow ... thats a 12 foot long plane .. and a 10 foot wingspan ... roughly .. then you have to accommodate the actual engine diameter ... well the actual arrow engine bay is a minimum of 10 feet across ... just shy of 8 feet for the engines ... and the rest for ribs mounting and engine needs like fuel power air bypass ... etc ... if that small engine diameter is 3 feet across your engine bay is now about 7 feet wide and tall ... so the length is now pushing 20 feet and 15 to 17 feet wing span .. and thats a VERY VERY rough calculation of scale in the head ... and it becomes one of the largest rc planes designs around ...

@AgentJayZ 2 года назад

OK, we get it. But really, Tl;Dr. It's good that you agree with me, but lets try something like a 100 word limit, eh? Update: So, you've ignored my request, and funnily enough, my automatic filters keep catching your comments due to the use of blocked words. I have been just "ok"-ing your comments up to now. But if you can't listen and respect the creators requests... you gotta go. I have given the robots full authority. See if you can guess how to get past them... This channel is not your soapbox. Sorry for using that one... you prob have no idea what it means. It's an old guy thing.

@0623kaboom 2 года назад

@ AgentJayZ ... anything is possible ... given enough time and the willingness to put in the work and effort ... the problem in todays world ... people want Instant gratification .. and are not used to the hard work and effort to accomplish the goal .. so somewhere around 2037 ... I may actually have it all done on paper .. assuming at 75 I can see the computer screen still lol

@rondesilva3077 2 года назад

@@AgentJayZ LOL! @... "try something like a 100 word limit"

@lukepotosky7710 2 года назад

@@rondesilva3077 hahaha it was 8 words over the limit.

@waterlife.1905 2 года назад

My interpretation of that awesome T-Shirt, an Army infantryman is on duty while seeing a ship full of sailors on duty who appear to be having a good time vs him on land not having a good time. Hence the ol middle finger salute?

@AgentJayZ 2 года назад

No. At the beginning of Russia's invasion of Ukraine, a vessel sent a radio message to a Ukrainian observation post on Snake Island (Ukrainian territory): "this is Russian warship. Surrender and you will not be fired upon." or something very similar to that. The Ukrainian reply over the radio was " Russian warship, go fuck yourself." This made the news, and you disappoint me by not being aware of it. Since then, Ukraine has issued a postage stamp with this graphical representation of the event, and many sources are selling merchandise featuring the design.

@FourthWayRanch 2 года назад

look at how much the RC turbines cost, or a solar for your helicopter? You can't DIY the metalurgy or can you?? What about building your own steam turbine?

@AgentJayZ 2 года назад

Solar gas turbines are for industrial use, and weigh about ten times as much as an equivalent aviation unit. Their advantage of course, is durability and extremely long life, but they will never fly. Also, let's stay in focus, people. This video is about designing and building your own jet engine. Steam turbines are not that.

@93corollausa94 2 года назад

you can use cheaper off the shelf alloys like they did with the jumo 004 engine from the me262 but this will come at the expense of engine life. the 004 had a 35 hour tbo and that was extremely optimistic

@93corollausa94 2 года назад

@@AgentJayZ numerous helicopters such as the mosquito xet and rotorway use solar T62 turbines so they can fly for sure

@N1WP 2 года назад

How much is a JT8d 217 run out and getting it up to speck worth ?

@93corollausa94 2 года назад

i have my own machine shop, i was wondering if you could explain how the jumo 004 sheet metal hollow blades are made and work. i could probably make something like that if i had enough info

@AgentJayZ 2 года назад

I have no experience with that engine, but I think I've seen a video on YT about just that process.

@93corollausa94 2 года назад

@@AgentJayZ i heard that the tooling they used to make the blades was similar to what they use to make car body panels. you got a link, id love to watch it!

@andriandrason1318 2 года назад

@@93corollausa94 The hollow turbine blades were produced from folded and welded Cromadur alloy (12% chromium, 18% manganese, and 70% iron) developed by Krupp.

@gordonlawrence1448 Год назад

The Jumo 004B was a complete git. IE "Winkle" Brown (UK's best test pilot ever) stated you had to throttle up and down very slowly, and the engine even if you babied it would be well and truly nerfed in 25-30 hours. We are talking scrap rather than rebuild. The earlier models lasted longer due to not being restricted to cheaper steels.

@93corollausa94 Год назад

@@gordonlawrence1448 yeah, that was because of the limitations of early materials. a hobbyist could probably pull it off but it wouldnt be very efficient or long lasting

@Ash1978E 2 года назад

Absolutely true. No one person can do it all. Thanks for reminding me of that. And Love the shirt. F Putin.

@voanirges 2 года назад

you are bunch of miserables....

@LeoSutic 2 года назад

Great video, great shirts! 🇺🇦

@shanecateriny4359 2 года назад

Love you. I know for a fact I can engineer, fab…produce a system to appropriately feed a j44

@gordonlawrence1448 2 года назад

Yes bean can engines are garbage compared to proper ones but they can be a lot of fun (though you have to get a bit paranoid with safety). I have spent years on and off making "bean can" jet engines. For those that have not seen them they use a bean can as the outer and a small can like a tomato puree can or single serving fruit can as the combustor. The compressor is a pig with 3 sets of blades on mine and a single set of blades on the output turbine to power the compressor. They get through butane like there is no tomorrow and my record is 1.2 to 1 for power to weight (utterly useless in the real world). It managed that for all of 10 seconds (timed with a stop watch) before turning into slag. Anyone who thinks designing an axial flow turbojet or turbofan is easy has not tried it for real. It is fun though if damn noisy. If you want a real genuine jet engine that is small and will last long enough to actually do anything then recently the price has dropped quite a lot. TR Turbines make a Wren TS45i for roughly $2200USD but that does not include the fuel pump engine management or anything. Also last time I checked it has a 20 hour service life and servicing was expensive. At one point they cost near 4 times that.

@MarkRose1337 2 года назад

Just 20 hours? Yikes. That's $1.83/minute in engine cost.

@justincase3880 2 года назад

Myself, as an RC turbine powered (factory built turbines) model jet pilot, would never try to build a turbo based turbojet .. I’m way past that. They’re way too kloojy/bulky/cumbersome, time consuming, and, for me, have no hobby value .. Also wouldn’t try building a mini RC one (GTBA engine). I had a mini RC JetJoe kit, cheap, was somewhat reasonably well made, but was not well balanced. Several tries, including a turbocharger balancer was tried, to no avail. Even if you finally get it the parts fit, the combustor to burn the fuel properly and get a decent mass flow, it’s impossible to balance without a VERY specialized (very expensive specialized equipment) balancing process …