Handmade Jet Engine, Improvements, Mishaps, Testing, Full afterburner
2021 ж. 3 Мау.
143 480 Рет қаралды
Hi,
the engine is still alive. :-)
Some infos: Weight 18 Kg/ 39 lbs
Diameter 20 cm/ 8 inch
Lenght 80cm/ 32 inch
Fuel Jet A1/ Diesel
Thrust 33 Kg/ 73 lbs
OK, if you want to see other videos, click on my channel name "Praendy" and you`ll find a lot.
Andy
I just imagine someone being slightly confused about the suspiciously cone shaped area of dried grass.
aliens
I thought the same thing.
i made fall come early on half the tree in front of my house. Praendy has friends who like fire.
Hahaha I guess a lot of us where thinking the same
@@cj09beira i.kym-cdn.com/photos/images/newsfeed/000/183/103/alens.jpg
Man makes fully functioning after burning turbojet engine. KZhead commenters ... Its cool, but it would have been cooler if you had built a fully functioning Boeing 747 and flew people across the Atlantic . Most of these people can't build a bird house.
Hey! I can build a birdhouse! I mean mostly, ok fine I can’t build a birdhouse. Ps: I can in fact build a birdhouse, for the sake of my joke you do not know this
🤣 You just perfectly summarized 90% of all KZhead comments. “Never let your total lack of knowledge about a complicated subject get in the way of offering expert advise”
Very impressive. I guess you went back to the “Drawing Board “ many times , until this. Man that motor seems strong for it size. The end result of metals to make the components can’t be cheap
That s one way to clear the weeds away.
If you could make a bypass fan that ejects cooling air into the afterburner you would solve most of your heat issues.
A distilled water and methanol mix injected at some stage could possibly help too.
unfortunately this would not help. an afterburner gets its thrust profits from reheating the exhaust gases. if you cool the whole stream you will lose thrust. I'd rather improve wall cooling
Hi, all jet engines with water/methanol injection working the same way. You cannot increase the power of a jet engine with that. The only purpose is to "hold" the thrust in warm/hot ambient temperatures. The density in hot weather conditions is more less, than in cold weather. You loose thrust in hot conditions. Andy
How about some ITC HT Ceramic Coating on the inside of the burner that way the metal isn’t so hot and it will keep your heat/thrust
@@Praendy if you use strait alcohol as a afterburner cooling spray ( like a ring that sprays out the cones inner surface radially) you would gain the cooling you need also using it between walls in the tail section before injection would soak up quite a bit of heat, this is similar to what nasa does on its shuttle rockets
This is actually breathtaking, your ability to make something so precise is hard to wrap your mind around
Can you imagine 6 of these engines on an XB-70 ??? The R/C plane would be 7 meters long but it would be glorious.
Germans... simply genius. This is art, btw.
Yes Art! He will definitely get accepted in Vienna Arts Academy.
@@mayank25121990 *I HOPE SO*
Your work is absolutely beautiful! The sound of your engine, the roar of the afterburner amazing work!
Nothing short of AMAZING. I dont think I have seen a homemade turbine with a functional afterburner. Man, nice work! Very cool. Would love to see it in a RC model of some kind.
THAT jet engine is so much for a RC model. I is powerful enough as for an experimental jet airplane, with a human pilot.
@@charlesbaires1 no its not
Amazing. No need to explain anything. Just take a bow because what you are doing is truly amazing.
7:15 "Och Nö" :D. Good to see this beast running again, now much cleaner than before.
69,000 RPM Nice!
Combustion can design: Angle the holes and understand a simple rule, never let the flame touch anything other than air and fuel. Have a look at combuster cans of bigger engines and see how the cans are usually made of multiple sleeves and have air holes that encourage air to cool the can and provide a boundary layer.
Beautiful afterburner
That's really cool I used to do that for a living building test engines for different kinds of platforms. We even made a modern version of an old German design before turbine and especially compressor technology was even known the way they chose to heat the air was with an internal combustion engine so basically it was an overblown internal combustion engine that had a separate turbineshaft to extract the power from the turbine on demand as torque as opposed to thrust in addition to the crankshaft power produced that could be directed to the compressor or as torque through a pair of clutches you could either couple crankshaft horsepower to suck in more air for thrust or coupling the turbine output to the crankshaft to power a heavy load, propeller, generators. Imagine a V8 with the cylinders of a motorcycle about 250cc each, Turbocharged by a high bypass fan turbojet engine. Utilizing the engine as the combuster section. Combusters sections were beyond most people not to mention most compressor designs induce stall at some point in there operation that can be objectionable if not dangerous. Explosive compressor burps scare the hell out of people to hear a giant explosion and see fire coming out of the front of the engine on take off does not give one that warm fuzzy feeling witnessing it from inside the aircraft. Typically not a real reason to turn around and land but if it's bad enough you let it go on too long you may not make it back.
I love how you're conserving the fire extinguisher because you know you'll be needing it many more times later
Hands down the coolest damn project I've ever seen somebody complete. I'm building my own turbine at the moment for a F16 falcon rc project and your work my friend is simply inspiring and motivates me to succeed! Absolutely beautiful work!
Thank you Dan, hard to overview all comments and questions during the time. Yt does not inform about all "new" comments. What turbine do you build? Andy
What a awesome thing for a shed project
VERY COOL ENGINE!!! It looks great mate
What a beautiful engine! And scary. Well done!
Truly wonderful work.
I also think you need more cooling. The housing of the air inlet is expanded I suspect. Nice project. Great job!
Nicely done
Just brilliant to watch!
Your air intake threads needed high temp loc-tite, or some way to mechanically lock the intake in place. It looks like the intake backed out because of vibration and the rotation of the shaft turning the air that slowly slowly turned the intake out of its placement. The beauty of an inclined plane wrapped helically around a shaft, it works in both directions.
Wird immer interessanter mit jedem Video 🤔
Thanks for the video ..from algeria 🇩🇿
That is fantastic!
very nice lawn mower
Du bist eine Legende !
Love the engine. I was in the Navy and working on GE404 engine (F/A-18). Once you come out of burner, you should stay at idle for a little while. then shutdown.
Excellent work. How did you achieved to ignite liquid afterburner fuel?
du bist positiv wahnsinig, megageil
YAY another upload!! also it would be cool if you could make shock diamonds 😳
The noises at 07:58 were just awesome! 👍👍👍
Hi, I like it too😊 Andy
7:56 - 9:13 That's one obstinate engine. Lights up again and again as the builder tries to shut it down 😊
Nice jet engine! Is the straight section at the back (practically half of the length) needed for technical purposes or is just to make it quieter? I'm asking because mass produced jet engines for model aircraft do not seem to have such straight section.
Badarse afterburning home-made jet!!! 👍
Most videos I watched about homemade or even a modified jet turbine, they always kept the turbine spinning after shutdown to cool down the internal temperature of the engine. Saves the bearings and keeps warping down. I want to see one of these mounted in a RC jet aircraft and watch the afterburner operate ! 👍
Hi Richard, At 06:20, you can hear my fan. The turbine is also slowly spinning. The fan gets mounted after each run for 10 min. Then the temperature is below 50C. Andy
excellent work! reheat working really well
Hi, Sometimes I am in contact with Phill. Wrote some emails😉 Thank you! Today I received a new compressor wheel. The show must go on👍 Andy
@@Praendy cool, Phill really does know his stuff when it comes to jet engines! He's like a modern day Sir Frank Whittle
you are the best sir
Good video thank you 👍
That is wicked sick. Certainly one of the better ones I've seen out in the civilian home shop world. You may wish to consider some explosion Shields around the compressor and hot wheel areas. When Garrett Turbine, Allied Signal now Honeywell originally quoted apu's to Lufthansa they requested containment shields around the compressor and hot wheel areas and we did the prototype parts as well as some of the test rigs used to certify the design as the units are typically in the tail any failure resulting in a fire or the ejection of parts cannot be tolerated. Basically the shroud of the hot section and the compressor were beefed up considerably I believe the initial design was about 20 mm in the area of the hot section of inconel that ended up getting a lot of metal removed so it's retain the strength but to lose some weight this is done to all the shrouds that make up as I remember about six different pieces with the original parts weighed about 45 lb to current shrouds weighing almost 80 pounds in total.
Hi Chauvin, I use some approved aircraft parts for the engine. The ngv and the turbine wheel is from a Tornado fighter jet APU, called KHD T 312. The turbine wheel is made for constant 68 000 rpm, up to 730° C egt. The compressor wheel is a Mitsubishi TD 13 wheel and can handle 85 000 rpm. I only want to go to 70 000 rpm and short time. The engine will never fly, its just for fun and for some displays. It weights 16,2 Kg with afterburner. Still working on the variable nozzle and the performance. Bought a nice balancing machine, made in 1966. So far I had vibrations turbine side and was restricted below 70 000. Now I did the first testruns with a "balanced" rotor and it works much better. Will make a new video next time👍 Andy from Germany
Good job!
My inner scientist/engineer thinks there's still about 20% more thrust... somewhere. Where that is? I have no idea.
Hi, Thats also my "good" question. 30 Kg thrust is not much for this size. Will try a different compressor wheel next time😉 Andy
@@Praendy This is still better in thrust/weight than the axial flow engines of World War 2.
@@Praendy I was thinking the same thing about size power ratio. I believe some of the small commercially available RC turbines put out 30lbs of thrust and I saw yours spike to a little over 70lbs yet it looks like it is almost 5 times the size???? Before the video got to the part where I saw it working so well, [ which is much better than I could do with no manufacturing capabilities.] I was thinking the best thing is to copy existing designs. Make a turbo fan on the front for hi-bypass cooling and then a 14 stage compressor with NO centrifugal fan/compressor stage. Maybe make a J97 with a turbo fan or copy the GE-90 series???? The General Electric J97 [no turbo fan] has a Thrust-to-weight ratio of: 11.5 ... Performance... Maximum thrust: Take-off 5,270lb (23.4kN) dry, 8,000lbf (35kN) afterburner Here are unclassified specifications for the J97... apps.dtic.mil/dtic/tr/fulltext/u2/393034.pdf
@@DrHarryT Hi, First I will try a different compressor wheel. An axial compressor is a big challenge for homebuilders. The advantage of a radial compressor is the simple handling. You have a good pressure ratio with only one stage. For the same in axial, you will need 4-5 stages. Also the diffuser is easy to install. The shaft is easy to machine and to balance. For an axial comp, the aerodynamic performance only allows very small mistakes. Lets see the thrust with the new comp wheel😉 Andy
@@Praendy Hey, thanks for replying! If I was forced to guess, I would probably say its something to do with the engines expansion ratio where the air meets the fuel. I would focus on adding the fuel to the expanding air as early as possible, so the fuel can better atomise. Also, providing the right shape that allows the quickest expansion, like a rocket nozzle. As long as there's no flow separation. Just hyperthetically, do you think you could use a two stage radial compressor? Simalar to this? www.ksb.com/blob/189792/3e0e4102c74e2138a90ee45b809c276b/gegenlaeufige-pumpe-2-data.jpg Amazing work btw. Infinite respect.
Hey Andy, 30 kg is quite a lot for your own design. Yes, it sounds really like a fighter jet. I had my jaw dropped from the beginning of the video. When the compressor cover came off so did my jaw too lol... Good luck!!
Hi Shanaka, Yes, the sound is awesome. 30 Kg is not bad, but the engine is calculated with twice the power, without afterburner. Next step? Trying a different compressor wheel. The engine is still in perfect condition after the incident👍👍👍 Thank you! Andy
@@Praendy Ok i didn't dare to say so but 30kg with after burner sounded really inefficient. I'm keen on seeing the rest :-)
Epic man Groetjes vanuit Suriname
What is the max thrust you’ve achieved with afterburner?
Impressive :)
Good video 💪👌
Cooles Spielzeug....hätte ich auch Spaß dran...😉
WOW 300N How did you get to spin up to 69000 RPM? Please reply
Very nice
Fantastic project - have worked in jet engine test for the last 40 years - I would highly recommend an inlet screen!
Hi Andrew, Thank you. An inlet screen is not required. The engine will never fly. Its a show model for displays, or jet meetings. Andy
@@Praendy I understand that, but over the years I have seen static turbines ingest all kinds of foreign objects from birds, to bolts to a crane hoist Chain!! They make pretty efficient vacuum cleaners!
@@OldGuyWithaCamera maybe we can see him throw in one of those broiler chickens from walmart
We used to do that to validate that the engines could withstand birdstrikes. They used to use a standard size duck, but once one caused much more damage than expected, it was discovered that some ducks swallow stones to make themselves less buoyant and able to dive more easily, after that they x-rayed each duck before firing it into the engine using an air canon!
how do you design the turbines for the jet engine? how do you know what measurements and stuff to make them?
whered you buy the turbine wheel and how big can i get one? im gonna make some of these motors in my machine shop for a jetpack
Ist der VEN separat gesteuert? Ich würde vorschlagen den mit der Fuel pumpe zu verbinden. Ebenfalls empfehle ich die Innenseite der Brennkammer, des AB Raums und des VENs mit Keramik zu beschichten um die Lebensdauer zu erhöhen.
Would you mind if I asked one question, please? Does it run on electricity or on shafts like a normal jet engine? Is there a compressor on the engine?
Nice. I'll give you as much as I can, as I have researched jet engines for a while. Water for fuel in the afterburner (needs 4000* F+ to achieve ignition) or as an air density increase. Ceramic turbine blades, like GE uses, can be manufactured and replaced early, and will not degrade nearly as quickly. High grade bearings and a lubrication system improvement is definitely necessary (I have a feeling that you spun a few in the "mishaps") A diverter cone in the afterburner would increase the output, but would need to be prepared for the environment. What you can't use: My implosive air intake uses cavitation/vaccume for improved inflow GE clockwork compressor is about the best basic form, but I have a ... different approach utilizing air to compress air while minimizing friction, sectionalized and stackable. I had a heated fuel system theory that worked with the water fuel concept, as well as a pulse jet burner concept (I have many burners...all need testing) Another theory is bleeding the thrust into the intake for higher heat, rpm, and burn efficiency, but I haven't scienced the "stuff" out of that yet, lol. I hope it helps in some way. You could use 100 pounds of thrust, right? For most guys, it's the rev of an engine, but for me, it's the blast of an afterburner that excites me. Ahh...that's the sound of horsepower.
Hi, I have already build a variable nozzle for the afterburner, but first I test with fixed nozzles. kzhead.info/sun/e7StYZSMsXhmY68/bejne.html To bleed exhaust air into the air intake again is really not effective. You use already burned air with less oxygen and a much less density. The bearings I use are able up to 90 000 rpm and one of the mishaps in the video was the new shaft, rubbing in the tunnel and got stuck. I will test a different compressor wheel next time and see, how it works. Thank you😉 for liking! Andy
Muy bonito, sirve para algo?, puede funcionar con carbon?
Grüße nach Hannover aus Münster. Ist der Einlassquerschnitt nicht etwas eng?
whoah thumbs up !
Nice!!
Que buen trabajo!!
what bearings do you use?
Can you make it usable in a pipeline .water sucking pump or oil? It would meore efficient
this is honestly the coolest thing ive ever seen. You're really out here iron-manning things I felt only companies with tons of money and resources could do. Could this actually power something like a light jet?
Very easily with alot of power to spare with the afterburner. Just have to find a way to deal with the tremendous heat and keep the airframe cool enough so the rc model jet doesn't burst into flames especially once you lite the burner.
I Like it a lot :)
Have you published the technical drawing of this jet engine ???
Where did you get your nozzle and guide vanes?
Wir gehen wieder!
very nice! did you measure compressor discharge pressure? how did you balance it? that AB is very happy and it isn't melting anything. very nice!
Hi, Yes, but with the current compressor wheel, the pressure is not that much and the thrust is missing a lot. Today I got a new wheel 8+8 bladed and a bit bigger. Balancing I do in my hands😉 First trying with knead, to find out the imbalance and when all feels good, grind off step by step the opposite side. For that I use compressed air and it takes much time. Thank you👍 Andy
@@Praendy That is my next step- learning the art of balancing. Keep up the good work!
whats the normal clearance between the impeller and intake cone thingy?
I wanna make one some day
Hello Andy, I already have a jet turbine engine, so the question is whether you can give me a blueprint or design for the afterburner, because I searched everywhere on the internet and couldn't find a blueprint or design for the afterburner, I want to make and install it in my jet engine, please answer 🙏🙏🙏
On other static jet engine tests, I notice they use a horn on the inlet to match air impedance ( if I recall correctly). Would that be useful in your application?
Hi, not really. Its much more important for axial compressor engines, to avoiding stall conditions in case of cross winds. I have a radial compressor. When my engine is running, I take care of the wind direction. Thats an advantage of a portable engine😉 Andy
awesome! build me one please! that thing wants to jump off the bench with that Nachbrenner!
how much more thrust does it bring?
exciting..... great....
lol, you better change your profile icon xD
I have been after building a similar engine for several years now and now have all the equipment however the 2 parts I cannot seem to find are the turbine wheel and ngv where did you manage to find them ? Regards tim
Hi Tim, found the turbine and ngv at ebay UK. Have a look! Ngv is still available, but I dont know your compressor size. www.ebay.co.uk/itm/144086277759?hash=item218c361e7f:g:05IAAOSwytBg00iH Andy
Wunderbar!
can this jet engine compete with the jet engine used by subsonex?
The engine got hot and the case expanded more than the intake housing so it fell off. I saw it happen earlier in the video. You'll need to find another means of attaching the intake. Just screwed together is not enough.
On the ground testing you have to get cool air passing through to take the heat away.
Curious tho, Why not make it a hi-bypass turbofan engine?(duct the bypass/reactive thrust into the combustion chamber) in order to prolong the life of the hot section of the engine problem tho is the turbofan, where will you get the profile of that and its material.
Hi Joel, things to tell is always easier, than to make. its not possible to put only a fan in front and using the air for an afterburner, or combustion chamber. The engine then needs at least 2 shafts and 2 turbine wheels. Thats my very first jet engine build. Will see in the future :-) Cheers Andy
nice!
super teil :)
Thats what I needed for those weeds
Die Grill Saison ist eröffnet.
Which metals you used for this
What is the turbine made of
Boah da hat sich was getan...Sieht saugeil aus :D
Danke👍
Beautiful engineering. This could go on a boat...you'd avoid a whole lot of regulatory hurdles by not putting it in an aircraft.
did you make you threads deep enough so that thermal expension doesn't pop out your air intake?
Hi, The thread is 2 mm. In ambient temperature its tight to screw in, so the compressed air has already 160 Celsius and the Teflon gets weak. To prevent, I will 4 screws around the intake to hold it in place. Andy
what kind of metal is it made of?
This yes is very strong yes from Argent
ABSOLUTELY MATHEMATICS IN ACTION!!!Where did you buy the turbine blade?
Hi, the turbine wheel is from a small APU and I found it on Ebay UK. Thank you👍 Andy
Soooo rc jet goes for Mach 1?
Done good
Your next level would be a turboFan : ) nice job sir! I guess vibration made the air intake nozzle slowly spin out of thread...Nicely enough, when it was off it did not touch the air-compressor blades. 😃
Hi, the heat made the teflon compressor cover soft and the aluminium intake got pushed out. Now all is made of aluminium. Thank you👍 Andy