DuB-EnG: JET Engines How They Work - Gas Turbines Midlands Model Engineering Exhibition Meridienne
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- čas přidán 25. 08. 2024
- James from the Gas Turbine Builders Association takes us through various builds of Jet Engines and explains in detail how they work and how the radio controlled model making society have developed and moved forwards in jet power technology. Massive thanks to the Midlands Model Engineering Exhibition and Meridienne Model Exhibitions limited for putting on such a magnificent event in Birmingham, Warwick and London!
www.meridienne...
www.gtba.co.uk/
James is amazing... Thanks for watching!! Please thumbs-up and subscribe! ...
James is!!
I've been flying RC for 24 years and have scoured youtube for video explanations of RC turgine engines. This video has by FAR the most lucid and comprehensive description of the engine's operation! Not just that, it covers the design evolution too. All the dozens of centrifugal compressors I've seen and didn't realise the obvious fact until NOW that the design is based off vehicle turbochargers. Not to mention the wonderfully detailed explanation of the combustor's hole design. For something that appears so low tech i.e. a can with holes, actually has an extremely specific design dictated by the complex thermodynamics and fluid mechanics in that area of the engine, to the extent that jet engine designers liken it to "black magic". And this video gives a decent idea why. Watching this was like getting my engineering fix through a needle. Thank you for posting! :)
James is marvellous... have a look at some of the other collaborations we have done together including a guided tour of his laboratory... thanks for such great feedback and kind words. I have passed this back to James ! All the best, Howard
Look at this, It´s the same, but the 3 compartments are not in a line, but with kinks instead, because it directly uses a car-turbocharger-unit. Of cource having everything in a line is more efficient and powerfull czcams.com/video/JzwfzgfJiJ4/video.html
Additionally, the compressor can be essentially the same, but the turbowheel is different in turbojets compared to car-turbochargers. In the video I just suggested, they can use the car-turbocharger-turbo-wheel directly, of course... The missing part they add, is the self-made combustion chamber. Video is from the "tech ingredients"-channel.
That’s right
As a (semi-retired) Licensed Aircraft Engineer, I found the skills and grasp of all the necessary engineering principles involved in creating this miniature gas turbine absolutely astonishing - to the point where I may have to begin searching local scrapyards for an old car turbo unit myself..! This also proves that men - and women - in sheds still rule..!
Funny that, I think I want to have a play with an old turbo too!!
Truly fantastic demonstration/discussion! One of the best explanation of basic miniature jet engine designs I've ever seen - bravo!
Glad you liked it! Thanks for the feedback!! :-) James features in more videos on this channel... Stay safe!! Howard
What a fabulous insightful presentation. As an ex RR guy this has inspired me to make one myself. Thank you for sharing this.
Thanks Dove River! - James is a fantastic presenter full of knowledge on this! - I have also done a little work for RR in the past :-) All the Best!
I was once a member of the GTBA... I wanted to build one of these engine from scratch...I never did but I'm able to replace my own bearing thank to your research and work. Jesus from Artes was very helpful too Now all we got is these "cocky fly by night" turbine companies that believe they work for nasa lol...They need to recognize your work.
Great video and thank guys
James is genuinely brilliant! - I'm hoping to get some time with him in the back garden in the near future... we will make some fantastic videos of engines running!!
Beautiful backyard jet, nice how the fuel is injected
Most excellent explanation, chaps! Thanks for sharing this content.
Glad you enjoyed it! - James is fantastic!
Am a huge fan of jet turbine. Building one for myself. Not sure it will self sustain. But I did learn a thing or two from this video. Thank you so much
Jacob!!! That’s lovely!! Good luck, be safe and thank you 🙏
Just wow ... just wow ... my heads spinning
czcams.com/video/C40vUjOCRUQ/video.html
Here it is in action :-).
I forgot how great this video is... James is a brilliant educator!!! :-)
Absolutlely!
I like a bit of gas turbine. I shall join.
Plenty more where that came from!!
@@DubiousEngineering I did about a decade working for OPRA BV, so I'm a turbinist. Jan Mowill was taught by the guy who invented the gas turbine, and inherited all his prototypes.
Wow. What a brilliant explanation.
Glad you liked it!!
The jet with wooden compressor is a Schreckling FD-3 64, designed by Kurt Schreckling.
Wow!!
Wow very nice thank you for sharing your hard work and dedication I really do appreciate your videos
So nice of you - thanks for your feedback!!
No sir thank you for helping me understand more clearly on this feels
Even i also want to make my own model jet engine ,you are brilliant bro👍🏻☺️
James is indeed epic!! :-)
Plywood compressor hitting 75k rpm. That's legendary, salute
Yes indeed!! Turns to fluff!!
I have to wonder if he was practising cutting on the plywood and that led to practising balancing with it followed by "why not just mount it and see if it works".. all the way to an optimised proper wheel.
Just fantastic innovation 💡 👏 👌... they really wanted a turbine solution and they continued to prototype until done! 😀
Thank you for making this video! Great explanation!
Absolute pleasure! - James did all the hard work!! :-)
4:09 I think the 5mm gap at your finger tip between the turbin blade root and the combustion chamber output leaks hot air into the aft bearing from the rear, which can damage the bearing. Also the turbulence of air leak itself reduces fuel efficiency. The improved version at 5:36 shows the 3mm gap is much smaller and more reasonable. But I think the factory made engines keep the gap smaller than 1mm.
You have a keen eye :-)
Wish to see more similar videos, if you kindly move camera closer would be great , thank y so much for the video
Please check my channel for more videos on James's jet engine 🙏
WOW, just amazing. Dubious, i posted one for you about glass blowing. I could have watched for hours. Such an amazing craft.
Can you send me the link please?!?
czcams.com/video/M_th4Aeqrjs/video.html
Right off to check!
That’s epic! ... cracking video... I bet you wish you could get a short interview with them!
Very good video and message full
James is fantastic!
Good info
Glad it was helpful!
Just one slight correction, a turbine works on 4 cycles is however no 4 stroke engine.
Turbines usually work on the basis of the joule cycle and actual 4 strock engines usually on the Otto cycle or the diesel cycle. Even a 2 stroke engine differs slightly from the otto and diesel cycle.
Besides that very nice presentation, i didn't knew that people used wood for compressor wheels.
Thanks for your feedback... I’ll see James soon and we will discuss!!
Fascinating!
Thank you :-) 🙏
Wow!
James's engines are epic!
Good luck
Thanks
please more videos like this
Thanks Juniorbatista... I'll try!
super
Kenny Ndogho thanks 🙏 Kenny ... here it is in action !! czcams.com/video/C40vUjOCRUQ/video.html
Best explaination .....wow...
... James is superb ... thanks for your kind words!! :-)
Awesome.
Glad you think so! James is a superstar!!
Very cool
Ah yes :-). James is epic ... and his jet engines are amazing!! Thanks 🙏 ... we have many more videos like this!! czcams.com/video/C40vUjOCRUQ/video.html
Thanks for explain....modal turbine engine ... working process...
Pleasure!! James is amazing!!
I'm subscribed. I fly model turbine airplanes and just love learning all the science involved. Thanks for dropping some knowledge.
Very happy this video is useful! Thanks for your comment! Please take a moment to share this with some friends that may also find it interesting! Thanks! Howard
Very cool.
Thanks very much! - Tell your friends!! :-)
A 10 minute message for my regular viewers... czcams.com/video/hAVadIYgLbk/video.html
@@DubiousEngineering Ok friend could leave.
Браво
Yes!
Fantastic interview! thanks for making this video!!
Glad you enjoyed it!
I’ll try to make one myself in the future 😍
I look forward to seeing some guy on youtube flying about in a single seater aircraft with 8 of these running on the wings :-) Thats you!
i.chzbgr.com/full/558208768/h39D4EC1E/amen-brudda
Amir Hahahah :-)
Thx
Alpenbahnen in TT pleasure!!! :-)
I study turbine development @ RollsRoyce in Germany and Derby.
You guys probably visited trinidad back about 20 years ago, I still build gas turbine
Great to know!! - They are so much fun!!
Really good video :)
James did all the hard work! ... I’ll pass on your thanks next time I see him!
James did the axial ever run? ive dug mine out of the chicken shed to give it a good clean up, get it back up to original condition again
You can contact James through the gas turbine builders association website
awaited about ramjet machines
One day my friend... one day!!
Arisset Aris Setiyanto you are CharliescAngels
Hahah... very good :-)
Welded a lot of inconcll and hastloy c276
... oooh ... welded!! I’ve seen that stuff friction welded ... large machines friction welding blades onto fan discs!! ...
Best explanation. But the way he says aluminum is the funniest thing ever 😂😂
Hahah... it’s spelt ALUMINIUM :-)
A lot of foreigners have trouble spelling and pronouncing English words.
Am planning on building a 3stage axial flow 1stage ngv. System
Epic! ... it’s bonkers!
Nice video. Wouldn't call it a 4 stroke engine though. You explained the 4 processes of an ICE but they apply to a 2 stroke engine as well.
Thanks kindly... I guess it was the best description we could think of at the time :-) Have a great weekend!!
Can Copper Tubes as sleeves to cover the vaporizing tube, will it survive the temperature of Combistion chamber ?
It may be brass rather than copper
Did you every visited a country in the Caribbean about 25 years ago , back then I built à single stage ngv and open combuster before knowing about the gtba
sherwin salvatori I certainly didn’t, but James may have done :-) ... great work!
Great video , how bearing lubrication is achieved? Thanks.
Maybe this helps?!? czcams.com/video/C40vUjOCRUQ/video.html
I'm sorry I'm no rocket scientist but those two engines are totally different my friend
agreed! ... aside from the fact that they both have turbines, compressors and combustion chambers... they are quite different :-)
In theory a gas turbine, is much simpler to construct than a reciprocating pistion èngine it only has 1 moving part , the shaft, with bladed fan assembly at either end. A pistion has 3 to more depending on design moving parts. My first turbine about 3 inches diameter single stage 2 stators a single piece combustion chamber , about 5000 rpm
Agreed... but that all important stator is a nightmare to manufacture :-). Thanks 🙏 for your great thoughts!! ... all the best!! Howard
How can someone contact them? Kindly advise
Google Gas Turbine Builders Association
wher is the video about the axial turbine?
Search the channel :-). Can’t post a link sorry
How does the bearing's lubrication-cooling process works ? Where are the pipes that feeds oil to the bearings ?
oil is atomised into the combustion chamber to take care of the exhaust bearings which are ceramic
gonzalo moreno andonaegui
on the more modern model engines , at least the several I have, they split off some of the fuel into ports that lube and cool the bearings, there is a small quantity of oil mixed with the fuel and the bearings are ceramic to withstand the heat and rpm.
@@chuckels431 exactly!! ... :-)
What will happen if I made the outer blades of diffuser in straight form without curve ?? Thank you for explanation ❤
What do you mean by diffuser? The last stage bladed disc? It would still spin but not as fast and efficient.
@@DubiousEngineering I mean compressor guide vane .
@@hydra7013 It would be a lot less efficient. The compressor rotor is shaped the way it is to move as much air as possible into the engine while the compressor guide vanes that follow it are shaped like that to guide the air from the compressor into the engine as efficiently and with as little resistance as possible. The turbine rotor is shaped the way it is for the same reason as the compressor rotor except in reverse; so the expanding and accelerating combustion gases coming out of the hot section of the engine speed up the turbine as efficiently and effortlesly as possible.
@@hydra7013weld sheet metal together in a shape of a triangle. Needs razor sharp edge towards the rotor.
I would actually like to do this , is there any drawings , or where can I get the information??
Www.gtba.co.uk
one question ive had for a long time is why havent RC Jet engine makers made an axial flow engine yet? is it due to price and complexity? ive seen one off ones but i mean mass production ones. very interesting video though!
James is brilliant... When I next see him, I'll ask the question!! :-)
@@DubiousEngineering Thank you! gave you a sub.
How very kind!! I have an eclectic mix ... but almost always engineering related!!
Radial flow is considerably more efficient in these single stage micro turbines. Only once they start becoming a fair bit bigger and get a lot of compressor stages does axial become more efficient.
@@pieterveenders9793what if I pay for a second spool? Turbine diameter as large as the compressor case. 3 stage axial fan. Low bypass ( for cooling).
How do the engineers know how big to make the fan blades for the engine?
They need to be a perfect fit and cant be too big because the speed they sin would make them destroy themselves!
Epic explanation ❤ , could we get the plan of this jet ??
See the description above for the website details... designs are not on there, but contact details are... glad you enjoyed the video!
Hi Sir, amazing video,
Can you make a video on phoenix super panther. As I am an engineering student as well as a model engineer enthusiastic.
Post me a super panther :-).
was the milled compressor made of aluminum or steel?
The compressor is the cold end and made of aluminium. The turbine is inkernel.
2000 deg C!!
Is any part of material of this engine exposed directly to this temp? Or is the engine protected by the air shield from this high temp?
James explain that they introduce just small amount of air to the combustion zone (small holes) and than at 2. zone they introduce more air for unburned fuel to burn off and the third delution zone where larger holes are located has the joy to introduced 75% of air to drop from 2000C downto 800C where fast moving air is lead to the turbine wheel.
my question is are the walls of combustion champer (first zone) exposed directly to the temp of 2000C?
I’ll get a more precise answer for you soon, but, I believe the ball of rotating fire moves and rolls around in the combustion chamber which reduces the surface heat on the combustion casing... so, I think it’s only the internal flame that gets to such a high temp...
You should watch AgentJayZ, he’s a jet engine mechanic, he explains things like this in great detail on full sized engines. To answer your question, the holes that let the intake air in provide a sheath of cool air along the wall of the chamber. This is why you MUST have that sheet metal with holes in it. If it weren’t for that, then the 2000 degrees would just melt everything. It’s also very important to ensure good mixing before the turbine not only for thermal efficiency but also so you don’t burn the bearing oil or melt/deform the turbine
You offer drawings for these?
Contact the gtba.co.uk
Actually I am making fd3 . could you tell me please that the book say to use 608bearing which dimension is 8*16*5 . Could I use 8*22*5 dimension bearing it's few large than? Sorry for bad English.
I think the question is a little confused. The original bearing for the FD3 had a 16mm O/D, which is usually referred to as the 688. The 608 bearing has a 22mm O/D, which of course will not fit in a 16mm shaft tunnel.
A standard 608 bearing are normally 8 x 22 x 7 (I/D x O/D x Length)
A standard 688 bearing can be 8 x 16 x 4 or 5 or 6 (I/D x O/D x Length)
If this chap has already made the shaft tunnel with a 16mm I/D and a shaft with an 8mm O/D then he will need to use 688 bearings. However if he has not yet made the shaft tunnel, then he could alter the design and make a 22mm I/D shaft tunnel and still use the standard 8mm shaft, in which case he would then have to use the 608 bearing.
In any instance, he should source the 'Full Compliment Angular Contact Hybrid' version of whichever bearing he finally selects.
Judging by the sound of his message, it might be worth recommending he join the GTBA, as it sound like he needs a little help.
I think the question is a little confused. The original bearing for the FD3 had a 16mm O/D, which is usually referred to as the 688. The 608 bearing has a 22mm O/D, which of course will not fit in a 16mm shaft tunnel.
A standard 608 bearing are normally 8 x 22 x 7 (I/D x O/D x Length)
A standard 688 bearing can be 8 x 16 x 4 or 5 or 6 (I/D x O/D x Length)
If this chap has already made the shaft tunnel with a 16mm I/D and a shaft with an 8mm O/D then he will need to use 688 bearings. However if he has not yet made the shaft tunnel, then he could alter the design and make a 22mm I/D shaft tunnel and still use the standard 8mm shaft, in which case he would then have to use the 608 bearing.
In any instance, he should source the 'Full Compliment Angular Contact Hybrid' version of whichever bearing he finally selects.
Judging by the sound of his message, it might be worth recommending he join the GTBA, as it sound like he needs a little help.
@@DubiousEngineering .thank you very very much for your feedback & sharing your precious time.
It’s our pleasure!
Connecticut
Hello Connecticut!
Then thatbit goes googeleygoogley gargled and the flames gopooof
Hahah :-) ... exactly!!!
Why is this dude carrying around a tribble?
The trouble with tribbles...
I wish to build my mini jet engine but i dont have any idea about the diffuser and turbine blades angle
Pop onto the gas turbine builders website!!
Im curios about the diffuser wedge vane angle and thickness and also in diffuser axial vane bend degree can you give me some hint sir..
if your aiming for more air to be moved through so that you could get more thrust then i would consider building an axial flow turbine as opposed to these centrifugal turbines
There's a centrifugal compressor at the front and an axial turbine at the rear... more videos on this soon! :-)
My bad I didn’t see that
But why not have axial both ends?
Dubious Engineering An axial compressor would increase the flow, most turbines are axial. The reason is that an axial compressor can have a much larger intake cross section. Model engines rarely have an axial compressor because they’re a lot more involved to make and a lot trickier to get working properly. In a typical axial compressor you can have hundreds of parts, because like they did with the turbine in this video you have to cast each blade individually for the rotor because of center of mass balancing. The stator can be just two pieces though. In addition, casting blades like this needs to be done with die casting or investment casting (which with full sized engines is the only option). So you need to make a wax version of each individual blade, coat it in investment, wait for it to dry, melt/burn out the wax, pour and spin in a centrifuge. Working at a pretty fast pace you could on average cast a few blades a day. And that STILL leaves machining the blades and making the rotor assembly, AND doing the center of mass balancing which you either need to get software for or program a solver yourself. It certainly is possible, you can see at the end of the video someone that did it, but it’s certainly not for the faint of heart
I think we have just found out resident expert!! Hello Liam!! Here’s a video you might like... a tour of the workshop!! DuB-EnG: Jet Engine maker workshop, Tri-copter model engineering, VTOL quadcopter aeroplane azipod czcams.com/video/_alUhQptOi4/video.html
Why don't they make jet engines like they use in fighter jets? These look completely different
Ahhh the principle is the same... Lots of air, a little fuel, a chamber, fire and huge amounts of expanding air out the back end!
Dear Sir, how the fuel is injected in the comb.. Chamber is that atomise or liquid form? How even possible that burning liquid form (I tried but went vain )
Please reply Respect from (BANGLADESH)😍😍😍😍
The chamber is heated with propane gas for 1 minuteto warm up the chamber, then the parafin is injected into the combustion chamber... hope this helps
would u please permit me to conversate u SIR. If possible (urgent)
Please visit the GTBA gas turbines association... they can offer much better guidance than me!
is that a shaving brush the interviewer is holding :-)
Tee hee ... that’s my shaving brush :-)
Where can we get this engine?
I’m sorry roberto, but this one is not commercially available... some model shops do sell jet engines!
@@DubiousEngineering thanks for your quick response.stay safe
You too my friend!!
You stay safe too mate :-)
Can I buy one?
Actually... yes... model jet engines are available for sale on websites today... they aren’t cheap though! ;-0
I am in need of a double shaft turbine if some one will make it for me
You would likely have to pay quite a lot to have something custom made :-)
10:10 engine & model name?
Home built by James and the team. I don’t believe this is available commercially
@@DubiousEngineering any of its working demonstration video available on CZcams?
I’m so sorry ... no... it’s quite unique (out of all 70k people haven’t noticed) ... well spotted!!
That alloy that he's talking about is fucking expensive one bolt on an aircraft made from that alloy cost Boeing 2k a piece.
en.m.wikipedia.org/wiki/Inconel
Itsounds likehebeleives it?
he absolutely does
Jet engines are just big feedback loops. I'd say all engines are.
Big feedback loops big feedback loops loops loops ....
75000 rpm or 7500 rpm did I hear that wrong 75000 rpm??? That’s insane considering it’s wood, handling that centrifugal force
D333ZZZNUTS you didn’t hear wrong... some of James engines run at 150k RPM
Dubious Engineering jeez, that would be loud as f***
Here’s the engine in action... this ones worth a share :-). DuB-EnG: AMAZING JET ENGINE with Centrifugal Compressor Axial Flow Gas Turbine ALL HOME MADE
czcams.com/video/C40vUjOCRUQ/video.html
Dubious Engineering any idea what compression ratio did he get from the compressors?
"only uses 18-20% of the air coming in" is that because air is comprised of 21% oxygen and all of that oxygen is used for combustion? Or is he talking about 18-20% of the 21% oxygen component coming in, so only 4% of the available air coming in is used for combustion.
The combustion chamber is quite efficient but it cant burn everything especially if the air is moving through the engine at supersonic speeds
You need to keep the exhaust temperature low. Also I will never understand why there is no grille of cooling inlets in front of each turbine vane to keep the hot air away. And a vortex thereafter to convert heat into speed.
This video hindi lauguage change
Yes
I’m sure mr Wittlemadehis socomplicated.
haha he sure did
mm
yup!
Please in spanish
Maybe turn on the subtitles
It's dubbed and EnGLisHe
Roger that :-)
I think your every engine without NGV😁😁😀😀🙄🙄🙄🙄
... Natural Gases are amazing!!
@@DubiousEngineering you make a video about NGV
Solar powered mobility scooter
czcams.com/video/dg2MpcoBhxA/video.html
how do jet engines work ... simply ... they suck .. they compress .... they ignite .... and they exhaust ... instead of taking the energy and making a psiton move to make a crank shaft turn to make a flywheel spin to make a drive shaft rotate to make your wheels move ... you spin fans to make shafts move and let the compressed and heated gases left over out to provide movement ...
.
yup they are JUST 4 stroke engines made to move air instead of pistons ... they are also more work efficient because they use the excess heated gases to propel you ... while a car engine just uses that heat to keep you warm in winter and otherwise cools it with a radiator wasting all that nice potential energy ... just like NASA discarding rocket boosters and fuel tanks every launch to get into space ... while a jet turbine engine is more like elon Musk which uses as much as possible over and over again to get into space ... the old adage .. waste not want not ... NASA never used it Elon is ... what he doesnt discard he reuses making it less costly in the long run
.
IF nasa reused the fuel tanks from the shuttle as building material for the ISS it could be big enough for a space hotel NOW but they chose to do like americans do all over (everyone essentially) toss their garbage and leave it wherever they like ... a good 80% of the JUNK orbiting earth is GARBAGE because it is not working or end of life or discarded rocket bits ... the shuttle when being designed was touted to be able to retrieve that JUNK and return it for study and resale as scrap or reused parts ... but they never did that instead they made it into a bus with a little haul capacity to get more junk into orbit.
.
It is a little scary... we do tend to fill our plant with fumes and junk... and now space too!!...
All those smarts and the English still mispronounce aluminum. ;-)
Now that’s funny 😂 coming from a people that have only existed for a few hundred years!! We invented language and discovered your land... :-) I lived in Chicago for 7 years - I started to develop the American twang but never got the chance to mis-spell aluminium!! :-). All the best :-)
@@DubiousEngineering It *is* pretty amazing. In only 200 years, we took your language and, you know, perfected it :).
Cheers, Mate XD
I’m ROFL ... you Americans!!! The Canadians got it right A! ... they mix in some french A!
@@aerobyrdable In the US you still use Olde English words we have replaced centuries ago, heck, you even use the measurement system we used BEFORE Imperial!
0:58 is he mocking him by that vomit gesture? how rude are u?
How interesting... James is a very good friend of mine :-). You guys really read too deep sometimes!!
Hello James. Nice work.. Please how can I contact you
Look up the British gas turbine association please.
@@DubiousEngineering Please is that a website ?