First off: I DO NOT KNOW DOOLY SQUAT ABOUT GAS TURBINES, but I do know enough about physics to get myself in trouble. That being said: the instant you began to talk about the “flow” of air in a linear motion (which is a fluid), the Bernoulli Principle was brought to mind. In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. (Googled.) Food for thought when designing your systems. Thank you for your time on this matter. Peace ✌🏻
These model turbines do not have a spark plug they have a glow plug also known as a burner during the start sequence the burner turns on and a fine amount of fuel is sprayed onto it because the element is glowing hot the fuel flashes off and ignites then as the engine temperature and RPM comes up to a defined setting in the ecu the main fuel line is opened adding more kerosene to the engine at the same time the starter motor increases it's speed turning the rotor assembly up to about 20000 RPM before diengaging the engine is now self-sustaining and will ramp to idle depending on the engine anywhere from 30000 to 45000 RPM
You actually answered the question I came looking for. He didn't mention the rmp needed at starting to get to self sustain. Thank you so much. BTW noob question, the glow plug is it automated? . Does it glow on its own or is it attached to some electronics which I don't think so. I checked TH-cam and there seems to be no explanation on how the glow plug works. Thank you so much sir.
@@jacobokpara7618, I'm a bit late to answer your question. But Glow Plugs are used in a lot of RC engines. Some electrical current is passed into them, and they heat up. After the engine is "self sustaining", the glow plug will continue to be hot, (even without more electrical current). In the case of smaller piston RC 2-stroke engines, the glow plug continues to serve as a point of ignition (once the pressure increases enough) Fuel Air Mixture + Pressure + Temperature of Glow Plug = Combustion For the RC piston engines I have, a separate "Glow Plug heater", is clipped onto the top of the engine. It is just a battery, and the top of the glow plug completes the circuit and heats up. Once the engine is running. the Glow Plug heater, is removed. And the engine runs on its own. ^for the piston engines. In the turbine, it may serve as a way to restore ignition (should the flame go out). But with turbines, there should be a continuous moving flame in the combustion area. So I don't think the glow plug would really need to do anything else after the start up phase.
Back in 1960 my brother was majoring in aeronautical engineering. He’d bring home trade magazines and I was disappointed in that most of the ads involved weren’t cool airfoils but competing ball bearing companies, stating size and various tolerances. Borrring!.....but NOW it makes sense.
There would be in a larger practical engine. These toy engines and even the smallest of real aircraft gas turbine engines have only a single-stage compressor, but that only works with a centrifugal compressor (not with an axial compressor).
It's a turbine engine, not a "turbine jet" or just a "turbine". It _contains_ a turbine, but the if you must use one word for the whole thing, try "turbojet" or "engine" depending on context. Thrust doesn't come out of the nozzle - *gas* flows out of the nozzle faster than it flowed into the intake, causing thrust in reaction. The centrifugal compressor impeller changes the flow from axial to *radial* (rather than "centrifugal")... and more importantly adds lots of speed.
Hey Buck, thanks for the comment! There's not much to see on the outside. In the front you can see a small section of the compressor wheel, starter motor and FOD screen. In the rear of the turbine through the nozzle you can see the back face of the turbine wheel. I'd love to take apart the Turbine, however, I don't want to cancel the warranty on it. There is another video where you can see more of what is required on a turbine airplane to make it all go. It's also the plane where this turbine was stolen from. th-cam.com/video/9On_PlQItPI/w-d-xo.html
This is the best video I've ever seen on how a model jet turbine works! To me, the combustion chamber is the most confusing part, as it's hard for me to visualize where pure air is flowing, versus the fuel-air mixture, versus where the flame is and where the flaming hot gases are?!?!?
The 3D model would certainly benefit from some flow arrows. Even better would be some dots representing small masses of air, flowing along that complex path, packed closer to together where pressure is higher... but that's a lot to ask for. Just arrows would be good...
Great video! Why does the ignited gas flow only to the exhaust/turbine end and not force its way back to the compressor stage? I'm assuming the pressure is much less on the exhaust side, but would love a detailed explanation.
In fluid dynamics, the fluid always takes the path of least resistance. Since the pressure at the turbine wheel is at atmospheric pressure and the pressure at the compressor wheel is much greater than atmospheric pressure, exhaust gasses can only flow towards the turbine wheel.
This was a very comprehensive video. I learned as new starter at lot. One thing is a bit sad. You told there are different fuel options which made me listen up. But you didn't go into detail. I would really have loved that
@@RCexplained You have told that *most* of the engines also work on diesel. Why just most of the engines and especially why? What are the requirements to run an engine on diesel? Cheers
Hi Jan, Most model jet turbines burn either diesel, jet fuel or kerosene. All these fuels are from the same fuel family. The ECU would have to learn the difference in the start up procedure for a new fuel within the first few startups. If there is any issue in the auto startup there may have to be some manual assistance.
Really super explanation. Do you have any idea why these engines sometimes stall on people during take off? Is it a lack of rigorous maintenance like partial disassembly and spraying out parts with a carb and choke cleaner?
HI Michael, thanks for the comment! I would expect a flame out to possibly be related to fuel delivery. A small air bubble in the fuel delivery line is enough to cause a flame out. Maintenance on most turbines are required to be done every 25hours of operation.
In model turbines, the lubrication is in the fuel. A very small percentage of the oil in the fuel makes its way to the front and rear bearings. There are no oil lines that feed the bearings. If you are familiar with how a small 2 stroke internal combustion engine works and receives oil to all internal components, the small model turbines lubricate in a very similar manner.
It's certainly possible considering they make these for turbo props. One thing to keep in mind is that they are terribly inefficient. The one shown in the video burns a litre of fuel every 3 minutes. When the plane is in the air it gets worse fuel mileage than my car.
@@RCexplained i wonder how many hobbyists have tried cheaper fuels, vaporized fuels for higher efficiency on a cost basis. liquid fuel seems so stone age.
@@RCexplained In theory my plane can do at least 40km with 6 litres of fuel in 8 minutes or less (that would convert to about 16 miles per gallon). Considering its going more than 185mph at that consumption its far better economy than any car :-) So the car comparison is a bit difficult since there is so much more to consider... Weight, Payload etc. But of course you're right. They are very inefficient. Nevertheless it would be interesting what such a small turbine could do in a backup generator.
Very nice video. I would just like to note that the fuel injectors go inside the tubes from the back to the front, not from the front as you designed. Also, gas start was used because it was easier, the igniters for rc model turbines have only been invented later. Anyways, good work on the video!
As far as I'm concerned, engine != turbine, the turbine is just part of the engine. I get that "turbine" is a more common term and people tend to get/click on it more easily, but still, it kinda makes it a little uncomfortable to hear. well, for me anyway 😁 Awesome video though! great explanation!!
Hey Gabriel thanks for the awesome comment. I will share my experience. I personally have learned that a turbine represents the full assembly and the turbine wheel is a specific part within a turbine. You can see this when you search for jet turbine or gas turbine, steam turbine, wind turbine in google images. When you search for the gas turbine wheel, you get the specific part you are after. I wouldn't call the grouping of all those different types of turbines, "engines," but rather turbomachinery. At the end of the day, which ever you call it, I'm sure I will know what you are talking about. :) Even some text books describing the brayton cycle will call the assembly a gas turbine but refer to the turbine wheel as just the turbine. It all works!
@@RCexplained Can you recommend any in the US ? I connected one and never heard back so i gave up on that place. need to find some where since i dont know the industry that much i was hoping you can me guide me to the a place you know.
Hey Anees Fatima, thank you for the very kind words. Appreciate your comment! There has been multiple requests for more turbine videos. In the coming weeks I'm hoping to get a couple more out. Thank you for watching!
Nice. I didn't know that the air goes into the combustion chamber from behind. I don't like the design that winds the air back and forth wasting energy. But if it works, it works.
The directional changes don't really waste energy. The path also allows incoming compressed air to keep the housing relatively cool, shielding it from the combustion flame.
Excellent video. But can you talk more about that fuel system? I never saw that type before. In the usual, the fuel enters behind the vapor tubes, and throw fuel inside the combustion chamber. In that type, you are throwing fuel inside the vapor tubes. why? Other thing. The function of the vapor tubes isnt to prevent the fuel injectors to melt? There is a part of the fuel injector that is inside the combustion chamber without the protection of the vapor tubes. Wouldnt it melt?
@@RCexplained but where is the spark plug in the comubstion chamber? I see there are many tubes with fuel that get sent to them but I dont know where the ignitor is/sparkplug in the combustion chamber in the model
Hey Spice Master, thank you for your comment. That sounds like a fun topic that I have not done already. I will certainly add it to the list of requested videos, but I should say that the queue is quite long.
This little Turbine is more advanced than anything out ther..its easy to operate..the Data Terminal does all the Work...my my... easy build..copy it...upgrade the Turbine a little bit..and ther it is..the Giant in the same order.
there now thats the video I was expecting ... the other one is called essentially the same thing but covers the support system for the turbine and NOT the actual turbine ... BIG difference
Thanks for the comment kaboom! The other video is called all components in a jet turbine airplane with the thumbnail showing many different components in an airplane. Not sure why you would expect to see a turbine torn down.
Is it possible to get the CAD design of the engine and the combustion chamber hole pattern please. And how do you lubricate the bearing. Any video on that?
Hi Jacob, the CAD models are downloaded from grabcad. The bearing is lubricated using turbine oil found in the fuel. The fuel mix circulates and contacts the bearing surfaces.
@@RCexplained alright thank you so so much. I have a model I made. Not sure it will work, my only issue is lubrication. I've seen models with a separate oil pipe for lubrication. In your model, you don't have that. Do you a video about lubrication of the bearings?
@2:17 kero start turbines doesn't uses propane gas to start or sparkplug.The kerosene flows through a injector and a glow igniter for ignition. But cool video. My buddy will be doing a actual rc turbine teardown and reassemble to testing video
Please check description. That is cool. Which turbine will he be opening up? I didn't want to open it up and void a lifetime warranty. I'd like to open one up but to be honest there's not going to be much in there to see.
@@RCexplainedSecond video will be a Rhino..but I do understand about the warranty 😁 what are your plans for the engine? th-cam.com/video/yeOt4z3rtio/w-d-xo.html th-cam.com/video/f2ITUJSo9ME/w-d-xo.html
@@RCexplained oh thanks, but do you know if they use like the same technology as turbo jet engines or turbofan engines because I know the 2 are different and I have always wondered which one they use because I thought the model jet turbines are turbo jet engines technology whereas most commercial airplanes use turbofan engine technology.
a turbofan engine has bypass air that flows outside of the combustion chamber. A turbojet engine has no bypass air. Model engines are turbojet engines for simplicity.
I know they use hybrid bearings. Bearings 608 and 6000 that I will be using should withstand 115,000 rpm, but the bearings I bought have poor performance and cannot withstand high rotation. The 608, 6000 should withstand 115,000 rpm and the 602 should withstand 65,000 rpm. Which bearing from which company is right for me?
Can I ask what is the lifespan of a jet turbine vs an EDF. Also what is the cost difference for jet turbine vs EDF with similar thrust output? (I realize EDF would need to be a lot bigger) Thanks
Jet Turbines require maintenance every ~25hrs to hold on to the lifetime warranty that some include. They are also more costly. However Jet Turbines will outperform EDF's at higher speed. There's another video on the channel that talks about this.
Hey man, great video great explanation, but I have a question, can I run any (I mean kingtech and jetcat swinswin) turbine engine on diesel, cause in my country jet A fuel is pretty rare, or if I can run kerosene, what type of kerosene can I run, are there any disadvantages with those fuels, I have looking in to turbine for almost 2 years now, I'm scared to buy one because of fuel type, if I can't run it, it would be a waste, I know it is long but I hope you will help me out, AS ALWAYS GREAT VIDEO, KEEP UP!!!
Hey Droid Tech, you can take a look at any of the manufactures spec sheets to see if their turbines can run on alternate fuels. Most turbines can. There are advantages and disadvantages, performance difference is subtle. Kerosene is great when you want minimum odour. Diesel is the most cost effective but does tend to have more smoke during start up and shut down.
Dumb question. Would there be any way to extend the rear turbine and add an after burner ring to make a true afterburner? I see a lot of real rc afterburners but they don't seem to do much but burn extra fuel for show as they are attached after the rear turbine
Edit. I know it would cause so many problems such as extreme rpm's and extreme heat. But damn it would be cool to see a truly functional rc afterburner. Who's rich enough to build it though? Haha
Hi Jeffrey. Yes it has been done and does significantly increase thrust when the fuel mix is correct. It should not have an increase in RPM's but will have a lot more heat out the newly fabricated exhaust. An afterburner burns fuel after the last turbine wheel stage. The expanding gases simply exit the turbine nozzle only and do not flow over any rotating components. That's why it has the name "afterburner."
Hey just a question...what system is used to spray fuel through the nozzles...is it an electrical pump or mechanical system? What pressure does it function at?
Hey James, It's an electric pump. I've never measured fuel pressure or saw any specification on it. I would expect pressure to be quite low. If you are looking for a specific value, I'd get in touch with the manufacture.
@@RCexplained thankyou very much for the reply,I wanted to know the preferred setup for RC!! I'll contact them!thanks again for an informative video,I subscribed!
@@jamesscott5407 Hi James, the RC turbine manufactures have everything included so that you do not need to worry about the specifics to this degree. For example the electric pump is typically integrated in the included turbine ECU. In a future video I will go over all turbine components in an RC Jet airplane. Thank you for the sub.
@@RCexplained yeah I guessed that by the prices haha...it's more of my curious mind than anything else...I've read some literature on turbine engines and they use swash plate style pumping elements so just wondered how the RC world did it. A video like that would be awesome. I wish you luck in your endeavours here on you tube,well presented and visualised!
Hello, for a kero start system, there is a pre heat of the fuel before ignition. I mention in the video that is uses a spark plug to ignite the fuel, however, a better term to use would be an igniter. Ignition can be created from either a heat source or an electrical spark.
Hello, both bearings are exposed to the internal fluid flow. The fluid is pressurized in the entire cavity. An extremely high percentage of oil actually never makes it to the bearings and simply burns out the exhaust nozzle. However this very small percentage of oil does make it to the bearings. In a more conventional jet turbine, there would be a dedicated system that pumps oil, injects the oil on to the bearings and then recycles it back to a reservoir. In our models, we rely on a much more simple system.
In the video a spark plug was said to fire the initial flame. However, an igniter would be the most correct term. In the turbine shown one ceramic igniter is used.
@@RCexplained okay Ill rewatch it again but one more quick question, is there only 1 igniter? Like in modern day turbo fan engines there are multiple im pretty sure but do they use only 1? And how many of those small tubes are there like those little purple ones you showed.
At 150,000 rmp the compressor tips are at mach 2.3, at adle the compressor gas flows are sub sonic, but not by a lot. Designing these things is a black art, not a science. If anyone tells you he that really understands what is going on, he lies. Still, hats off to the guys who did get these things to work in the end, because when I was first interested in 1970, there were quite learned engineering articles explaining how model scale gas turbines could never be made to work at all. One needs to understand that bumble bees can really fly, but according to standard aeordynamics they could not fly at all. Think of the hot gas as more like white hot treakle and you are getting there. A blast of hot gass at mach 2 on the turbine stator is more like a shower of tiny rubber bullets than we can even imagine. Think of those tiny rubber bullets as all being connected together by a property that we call viscosity. The work that we have to thank for all this started with heavy military helicopter starter motor gas turbines and moved on to your turbo diesel truck and later even my 1.5 dci turbine charger.
what happen to the motor in front of the engine you hold that ussd for starting the engine? your explanation is enermously talking only the combustion chamber only not entirely, for example the motor for starting the engine from dead cold
Hey Francis. It's not a dumb question, all questions are welcomed on this channel! And thank you for yours! The propane is used as starting fuel since at room temperature it already exists in gaseous form. Thus it's easier to ignite. Once the propane ignites kerosene can be introduced and the propane is then shut off. A kerostart turbine requires heating up the kerosene in order to turn it in to gas form to start the turbine.
@@RCexplained The term "kerostart" would have made more sense if you included this in the video: it means starting on just the engine's normal fuel (kerosene), instead of starting on a special starting fuel (such as propane).
RCexplained Why model Gas jet engines produce more thrust than EDFs the same diameter ? Could an EDF reach the same thrust that a Gas jet with a powerful compact electric motor ?
For much more detail on how combustion chambers and turbines work in general visit the AgentJayZ channel here on TH-cam. Yes, he rebuilds and describes full size jet engines, but the fundamentals are the same. His channel is a priceless resource if you build DIY turbojets or simply want a deeper understanding of the details of turbojet operations. Since he has hundreds of videos it is helpful to use the channel search function, perhaps starting with "combustor" since he has great details on that.
hi Ryan, I emailed an RC turbine manufacturer asking why RC turbines do use bypass fans given they are capable of up to 80% thrust (ref RR).. No answer
Hey HiTekHead. Assuming you actually meant "do not use." I would expect the reason RC turbines do not use bypass fans is purely due to cost. Most turbine guys are not worried about fuel consumption. The biggest difference you would get by using bypass fans is better fuel efficiency. However there is a cost to this as well as the extra complexity.
There is only 1 spark plug/ignitor right? Like there arent more then 1 inside like a real commercial turbofan th-cam.com/video/L24Wf0VlTE0/w-d-xo.html 1:47 seconds on that video. I just wanted to make sure. By the way nice job on the 3d printed model it looks like u put a ton of effort into it and it payed off with a good explanation, the spark plug question is my only question.
![[LIVE] BABYMONSTER(베이비몬스터) - DRIP | 두시탈출 컬투쇼](http://i.ytimg.com/vi/UG05pxLGwzc/mqdefault.jpg)
First off: I DO NOT KNOW DOOLY SQUAT ABOUT GAS TURBINES, but I do know enough about physics to get myself in trouble.
That being said: the instant you began to talk about the “flow” of air in a linear motion (which is a fluid), the Bernoulli Principle was brought to mind.
In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. (Googled.)
Food for thought when designing your systems.
Thank you for your time on this matter.
Peace ✌🏻
These model turbines do not have a spark plug they have a glow plug also known as a burner during the start sequence the burner turns on and a fine amount of fuel is sprayed onto it because the element is glowing hot the fuel flashes off and ignites then as the engine temperature and RPM comes up to a defined setting in the ecu the main fuel line is opened adding more kerosene to the engine at the same time the starter motor increases it's speed turning the rotor assembly up to about 20000 RPM before diengaging the engine is now self-sustaining and will ramp to idle depending on the engine anywhere from 30000 to 45000 RPM
You actually answered the question I came looking for. He didn't mention the rmp needed at starting to get to self sustain. Thank you so much.
BTW noob question, the glow plug is it automated? . Does it glow on its own or is it attached to some electronics which I don't think so.
I checked TH-cam and there seems to be no explanation on how the glow plug works.
Thank you so much sir.
@@jacobokpara7618, I'm a bit late to answer your question.
But Glow Plugs are used in a lot of RC engines.
Some electrical current is passed into them, and they heat up.
After the engine is "self sustaining", the glow plug will continue to be hot, (even without more electrical current).
In the case of smaller piston RC 2-stroke engines, the glow plug continues to serve as a point of ignition (once the pressure increases enough)
Fuel Air Mixture + Pressure + Temperature of Glow Plug = Combustion
For the RC piston engines I have, a separate "Glow Plug heater", is clipped onto the top of the engine. It is just a battery, and the top of the glow plug completes the circuit and heats up.
Once the engine is running. the Glow Plug heater, is removed. And the engine runs on its own.
^for the piston engines.
In the turbine, it may serve as a way to restore ignition (should the flame go out).
But with turbines, there should be a continuous moving flame in the combustion area. So I don't think the glow plug would really need to do anything else after the start up phase.
@@andrewmattox1233 the real question is where to put the glow plugs i dont understand
@@pepepopo6415 the glow plug used to be a traditional plug screwed in from outside the turbine. Most have an internal glow plug now.
Back in 1960 my brother was majoring in aeronautical engineering. He’d bring home trade magazines and I was disappointed in that most of the ads involved weren’t cool airfoils but competing ball bearing companies, stating size and various tolerances. Borrring!.....but NOW it makes sense.
Finally an explanation!!! Thanks
Thanks for the comment!
Best explanation I‘ve ever seen and heard. Great 👍 Thank you 🙏
Wow, thank you!
Haha that would be awesome and bright.
You sir, are literally the best!
That is debatable but do Appreciate the comment Muhammed!
U r a very impressive important part of our RC World.. thank you
Thanks for the awesome comment!
I was expecting a whole series of compression fans. Interesting.
There would be in a larger practical engine. These toy engines and even the smallest of real aircraft gas turbine engines have only a single-stage compressor, but that only works with a centrifugal compressor (not with an axial compressor).
It's basically a gas powered Dyson
You are spot on, Dyson understands more about high velocity and high acceleration (1000g +) gas flow than anyone left working at NASA.
This was very helpful. Very interesting 🤔
Thank you.
thanks a lot , the small nozzle fuel different if we use propane fuel ?
Thank you for such a great and professional explanation!
Glad it was helpful!
How would/could you convert it to a plasma jet turbine...?
The best I've seen on how it works,good job
No one could explain like u... thanks!
Thank you for the comment SURYAN NASA!
FFKKKK i hate this youtube autoplay... sudden LOUD "HEY GUYS" wakes up everybody in the room.
It's a turbine engine, not a "turbine jet" or just a "turbine". It _contains_ a turbine, but the if you must use one word for the whole thing, try "turbojet" or "engine" depending on context.
Thrust doesn't come out of the nozzle - *gas* flows out of the nozzle faster than it flowed into the intake, causing thrust in reaction.
The centrifugal compressor impeller changes the flow from axial to *radial* (rather than "centrifugal")... and more importantly adds lots of speed.
Thanks! Very clear explanation. Would have liked to take a closer look at what you are holding though.
Hey Buck, thanks for the comment! There's not much to see on the outside. In the front you can see a small section of the compressor wheel, starter motor and FOD screen. In the rear of the turbine through the nozzle you can see the back face of the turbine wheel.
I'd love to take apart the Turbine, however, I don't want to cancel the warranty on it.
There is another video where you can see more of what is required on a turbine airplane to make it all go. It's also the plane where this turbine was stolen from.
th-cam.com/video/9On_PlQItPI/w-d-xo.html
@@RCexplained Okay, but zooming in to eliminate the space wasted on livingroom furnishings (which is most of the image) would be much better.
A really good explanation 🙂
Glad you think so!
Please which motor used in jet engine kv ? Of brushless motor please tell me details
Yeap finally a proper explanation.
Thanks for the comment Fernando.
This is the best video I've ever seen on how a model jet turbine works! To me, the combustion chamber is the most confusing part, as it's hard for me to visualize where pure air is flowing, versus the fuel-air mixture, versus where the flame is and where the flaming hot gases are?!?!?
The 3D model would certainly benefit from some flow arrows. Even better would be some dots representing small masses of air, flowing along that complex path, packed closer to together where pressure is higher... but that's a lot to ask for. Just arrows would be good...
Great video! Why does the ignited gas flow only to the exhaust/turbine end and not force its way back to the compressor stage? I'm assuming the pressure is much less on the exhaust side, but would love a detailed explanation.
In fluid dynamics, the fluid always takes the path of least resistance. Since the pressure at the turbine wheel is at atmospheric pressure and the pressure at the compressor wheel is much greater than atmospheric pressure, exhaust gasses can only flow towards the turbine wheel.
Can we use a cnc machine to do this
😮😊 Finally I got the right explanation
Glad it helped!
Perfect explanation and wonderful visual aids. Nice work
Thanks for the comment M Prior!
Nice and easy way of explaining. Thanks.
You are most welcome, thanks for the comment!
Awesome video. But a tip, TV died for a reason, drop the reporter voice.
hello, does the combustion chamber's length have any impact on the jet's working ?
Yes
This was a very comprehensive video.
I learned as new starter at lot.
One thing is a bit sad. You told there are different fuel options which made me listen up.
But you didn't go into detail. I would really have loved that
Hey Jan what details were you looking for?
@@RCexplained You have told that *most* of the engines also work on diesel.
Why just most of the engines and especially why?
What are the requirements to run an engine on diesel?
Cheers
Hi Jan, Most model jet turbines burn either diesel, jet fuel or kerosene. All these fuels are from the same fuel family. The ECU would have to learn the difference in the start up procedure for a new fuel within the first few startups. If there is any issue in the auto startup there may have to be some manual assistance.
@@RCexplained Oh, so any jet can run diesel.
It is really just the matter of how to startup?
That's convenient. Thanks for your reply :)
Really super explanation. Do you have any idea why these engines sometimes stall on people during take off? Is it a lack of rigorous maintenance like partial disassembly and spraying out parts with a carb and choke cleaner?
HI Michael, thanks for the comment! I would expect a flame out to possibly be related to fuel delivery. A small air bubble in the fuel delivery line is enough to cause a flame out.
Maintenance on most turbines are required to be done every 25hours of operation.
Thank you
Great explanation Thank you
Thanks man 👍
You bet
Could you make a video about the bearing's lubrication-cooling process ? Where are the pipes that feeds oil to the bearings ?
In model turbines, the lubrication is in the fuel. A very small percentage of the oil in the fuel makes its way to the front and rear bearings. There are no oil lines that feed the bearings. If you are familiar with how a small 2 stroke internal combustion engine works and receives oil to all internal components, the small model turbines lubricate in a very similar manner.
@@RCexplained the fuel/oil mixture is directly injected into combustion chamber, there is no way for oil to reach the bearings?
blows me away almost no-one makes a diy high voltage generator out of these.
It's certainly possible considering they make these for turbo props. One thing to keep in mind is that they are terribly inefficient. The one shown in the video burns a litre of fuel every 3 minutes. When the plane is in the air it gets worse fuel mileage than my car.
@@RCexplained i wonder how many hobbyists have tried cheaper fuels, vaporized fuels for higher efficiency on a cost basis. liquid fuel seems so stone age.
hey Jester. Do you have an example?
@@RCexplained My swiwin turbine only burns 1 liter in 7 minutes at cruise speed
@@RCexplained In theory my plane can do at least 40km with 6 litres of fuel in 8 minutes or less (that would convert to about 16 miles per gallon). Considering its going more than 185mph at that consumption its far better economy than any car :-)
So the car comparison is a bit difficult since there is so much more to consider... Weight, Payload etc.
But of course you're right. They are very inefficient.
Nevertheless it would be interesting what such a small turbine could do in a backup generator.
Exellent explanation thanks ;-)
Thanks for the comment, glad the video helped.
Very nice video. I would just like to note that the fuel injectors go inside the tubes from the back to the front, not from the front as you designed.
Also, gas start was used because it was easier, the igniters for rc model turbines have only been invented later.
Anyways, good work on the video!
Thanks for the comment José.
Came here to write that!
As far as I'm concerned, engine != turbine, the turbine is just part of the engine. I get that "turbine" is a more common term and people tend to get/click on it more easily, but still, it kinda makes it a little uncomfortable to hear. well, for me anyway 😁
Awesome video though! great explanation!!
Hey Gabriel thanks for the awesome comment. I will share my experience. I personally have learned that a turbine represents the full assembly and the turbine wheel is a specific part within a turbine.
You can see this when you search for jet turbine or gas turbine, steam turbine, wind turbine in google images. When you search for the gas turbine wheel, you get the specific part you are after.
I wouldn't call the grouping of all those different types of turbines, "engines," but rather turbomachinery.
At the end of the day, which ever you call it, I'm sure I will know what you are talking about. :) Even some text books describing the brayton cycle will call the assembly a gas turbine but refer to the turbine wheel as just the turbine. It all works!
thank you very much for the video sir !
Most welcome!
I found this video every helpful. I was curious to know is there any kind of certification to repair these turbines? If so where can i go in the US?
Yes, more than likely any certification required is controlled by the manufactures and dealers of these turbines.
@@RCexplained Can you recommend any in the US ? I connected one and never heard back so i gave up on that place. need to find some where since i dont know the industry that much i was hoping you can me guide me to the a place you know.
I have no connections within this part of the industry.
The way you explain is superb. You should desrve something big . Thanks for making this video
Hey Anees Fatima, thank you for the very kind words. Appreciate your comment! There has been multiple requests for more turbine videos. In the coming weeks I'm hoping to get a couple more out. Thank you for watching!
Thank you.
You're welcome!
Where I can find that CAD model sir?
Nice.
Nice. I didn't know that the air goes into the combustion chamber from behind. I don't like the design that winds the air back and forth wasting energy. But if it works, it works.
The directional changes don't really waste energy. The path also allows incoming compressed air to keep the housing relatively cool, shielding it from the combustion flame.
Great video. You made this turbine? And you made the CAD model?
Thank You Rudá. The turbine was purchased. The CAD model was downloaded off of a 3D model site and modified to suit the video.
@@RCexplained Nice! Where I can get this CAD?
@@RBAERO I think it was grab cad
Great vid, and I only build boats! And steam driven at that!
Thanks Gor!
Excellent video. But can you talk more about that fuel system? I never saw that type before.
In the usual, the fuel enters behind the vapor tubes, and throw fuel inside the combustion chamber. In that type, you are throwing fuel inside the vapor tubes. why?
Other thing. The function of the vapor tubes isnt to prevent the fuel injectors to melt? There is a part of the fuel injector that is inside the combustion chamber without the protection of the vapor tubes. Wouldnt it melt?
What is the overall efficiency of a model jet engine ?
Nice sir you are great
Thanks and welcome
❤❤❤👍👍👍👍
where is the igniter in the combustion chamber? Is it in the tubes because if so wouldnt there need to be 1 for atleast each tube?
The turbine in the video has one.
@@RCexplained but where is the spark plug in the comubstion chamber? I see there are many tubes with fuel that get sent to them but I dont know where the ignitor is/sparkplug in the combustion chamber in the model
Hello rcexplained, is this jet turbine model exactly like the real one?
Can you talk about (if you haven't already) the pros and cons of rc jet vs piston engines? Especially regarding helicopters
Hey Spice Master, thank you for your comment. That sounds like a fun topic that I have not done already. I will certainly add it to the list of requested videos, but I should say that the queue is quite long.
Which material is use to make bearings? And which oil is used for these turbines MOBILE JET ?
Hybrid of Ceramic/Steel. Mobil DTE light is used in the turbine I was holding.
@@RCexplained Thank you for the information. We use Mobile Jet II in our real aircraft turnbine. This was very helpful. Highly obliged.👍🏻😊
I want to build a 100-120 lbs drone what would be my best engine option?
This little Turbine is more advanced than anything out ther..its easy to operate..the Data Terminal does all the Work...my my... easy build..copy it...upgrade the Turbine a little bit..and ther it is..the Giant in the same order.
Jet A1 and kerosene are two different things?? Always thought that "Jet A1" was just the same slimy stuff!!??
Typical "jet" fuels, including Jet A, are kerosene-based. Try the Wikipedia page for "Jet fuel" for more explanation.
I wish I had the tools to build the components because I wanna play with building a small jet engine
there now thats the video I was expecting ... the other one is called essentially the same thing but covers the support system for the turbine and NOT the actual turbine ... BIG difference
Thanks for the comment kaboom! The other video is called all components in a jet turbine airplane with the thumbnail showing many different components in an airplane. Not sure why you would expect to see a turbine torn down.
Is it possible to get the CAD design of the engine and the combustion chamber hole pattern please.
And how do you lubricate the bearing. Any video on that?
Hi Jacob, the CAD models are downloaded from grabcad. The bearing is lubricated using turbine oil found in the fuel. The fuel mix circulates and contacts the bearing surfaces.
@@RCexplained thank you so much.
I know it too much to ask, any possible links to this particular model for download? .
Hey Jacob, I don't remember which one I had used. Try a few of them.
@@RCexplained alright thank you so so much.
I have a model I made. Not sure it will work, my only issue is lubrication. I've seen models with a separate oil pipe for lubrication. In your model, you don't have that. Do you a video about lubrication of the bearings?
I don't have a video on lubrication of the bearings.
can I have the model's file to open it in CAD software?
@2:17 kero start turbines doesn't uses propane gas to start or sparkplug.The kerosene flows through a injector and a glow igniter for ignition. But cool video. My buddy will be doing a actual rc turbine teardown and reassemble to testing video
Please check description. That is cool. Which turbine will he be opening up? I didn't want to open it up and void a lifetime warranty. I'd like to open one up but to be honest there's not going to be much in there to see.
@@RCexplainedSecond video will be a Rhino..but I do understand about the warranty 😁 what are your plans for the engine? th-cam.com/video/yeOt4z3rtio/w-d-xo.html
th-cam.com/video/f2ITUJSo9ME/w-d-xo.html
It's in a Boomerang sprint
the vaporizing tube was it face the right direction in initial time before the video started.
do they use the same technology as turbojet engines or turbofan engines?
model jet turbines are very much simplified versions of larger scale turbines.
@@RCexplained oh thanks, but do you know if they use like the same technology as turbo jet engines or turbofan engines because I know the 2 are different and I have always wondered which one they use because I thought the model jet turbines are turbo jet engines technology whereas most commercial airplanes use turbofan engine technology.
a turbofan engine has bypass air that flows outside of the combustion chamber. A turbojet engine has no bypass air. Model engines are turbojet engines for simplicity.
How do you calculate how big the holes in the combustion chamber are going to be?
I do not have these specifics.
I know they use hybrid bearings. Bearings 608 and 6000 that I will be using should withstand 115,000 rpm, but the bearings I bought have poor performance and cannot withstand high rotation. The 608, 6000 should withstand 115,000 rpm and the 602 should withstand 65,000 rpm. Which bearing from which company is right for me?
Can I ask what is the lifespan of a jet turbine vs an EDF. Also what is the cost difference for jet turbine vs EDF with similar thrust output? (I realize EDF would need to be a lot bigger) Thanks
Jet Turbines require maintenance every ~25hrs to hold on to the lifetime warranty that some include. They are also more costly. However Jet Turbines will outperform EDF's at higher speed. There's another video on the channel that talks about this.
Hey man, great video great explanation, but I have a question, can I run any (I mean kingtech and jetcat swinswin) turbine engine on diesel, cause in my country jet A fuel is pretty rare, or if I can run kerosene, what type of kerosene can I run, are there any disadvantages with those fuels, I have looking in to turbine for almost 2 years now, I'm scared to buy one because of fuel type, if I can't run it, it would be a waste, I know it is long but I hope you will help me out, AS ALWAYS GREAT VIDEO, KEEP UP!!!
Hey Droid Tech, you can take a look at any of the manufactures spec sheets to see if their turbines can run on alternate fuels. Most turbines can. There are advantages and disadvantages, performance difference is subtle. Kerosene is great when you want minimum odour. Diesel is the most cost effective but does tend to have more smoke during start up and shut down.
HOW REDUCED SIDE BUT MORE POWER THAN THIS.
Dumb question. Would there be any way to extend the rear turbine and add an after burner ring to make a true afterburner? I see a lot of real rc afterburners but they don't seem to do much but burn extra fuel for show as they are attached after the rear turbine
Edit. I know it would cause so many problems such as extreme rpm's and extreme heat. But damn it would be cool to see a truly functional rc afterburner. Who's rich enough to build it though? Haha
Hi Jeffrey. Yes it has been done and does significantly increase thrust when the fuel mix is correct. It should not have an increase in RPM's but will have a lot more heat out the newly fabricated exhaust.
An afterburner burns fuel after the last turbine wheel stage. The expanding gases simply exit the turbine nozzle only and do not flow over any rotating components. That's why it has the name "afterburner."
Jetcat does make a generator on the NX series, to supply power for the operation of the turbine and to replenish the Rx batterys.. 💖👍💖
That is pretty awesome!
Hey just a question...what system is used to spray fuel through the nozzles...is it an electrical pump or mechanical system? What pressure does it function at?
Hey James, It's an electric pump. I've never measured fuel pressure or saw any specification on it. I would expect pressure to be quite low. If you are looking for a specific value, I'd get in touch with the manufacture.
@@RCexplained thankyou very much for the reply,I wanted to know the preferred setup for RC!! I'll contact them!thanks again for an informative video,I subscribed!
@@jamesscott5407 Hi James, the RC turbine manufactures have everything included so that you do not need to worry about the specifics to this degree. For example the electric pump is typically integrated in the included turbine ECU. In a future video I will go over all turbine components in an RC Jet airplane.
Thank you for the sub.
@@RCexplained yeah I guessed that by the prices haha...it's more of my curious mind than anything else...I've read some literature on turbine engines and they use swash plate style pumping elements so just wondered how the RC world did it. A video like that would be awesome. I wish you luck in your endeavours here on you tube,well presented and visualised!
How will this engine start ?
I mean before starting there is no heat in the combustion chamber or nozzle to convert the liquid fuel to gas.
Hello, for a kero start system, there is a pre heat of the fuel before ignition. I mention in the video that is uses a spark plug to ignite the fuel, however, a better term to use would be an igniter. Ignition can be created from either a heat source or an electrical spark.
Please sir I want you to teach me the functions of turbine components and how to fix them together
WOW
how does the oil make its way to the bearing especially the front one?
Hello, both bearings are exposed to the internal fluid flow. The fluid is pressurized in the entire cavity. An extremely high percentage of oil actually never makes it to the bearings and simply burns out the exhaust nozzle. However this very small percentage of oil does make it to the bearings.
In a more conventional jet turbine, there would be a dedicated system that pumps oil, injects the oil on to the bearings and then recycles it back to a reservoir.
In our models, we rely on a much more simple system.
how many spark plugs are there?
In the video a spark plug was said to fire the initial flame. However, an igniter would be the most correct term. In the turbine shown one ceramic igniter is used.
@@RCexplained okay Ill rewatch it again but one more quick question, is there only 1 igniter? Like in modern day turbo fan engines there are multiple im pretty sure but do they use only 1? And how many of those small tubes are there like those little purple ones you showed.
the purple tubes like at 8:30
Did the engine work if I made the outer blades of diffuser straight without curve ?? Plz reply , thank you .
Are you referring to the stator vanes on the turbine side? Yes it can still work but efficiency is reduced.
@@RCexplained No I mean the compressor guide vane .
@@hydra7013 yes it would be along the same idea. It can work but would rob you of flow efficiency. You will want to optimize it as best as you can.
@@RCexplained Thank you so much .
@@hydra7013 no problem
Hey dear . Can i buy this type of rc turbine engine.. ? Which site i can buy
Yes you can. I'm not sure where you are from, however, you can type in RC turbine and I'm sure sites/dealers will pop up.
Hello, can you tell me what is the fuel consumption in this type of mini jet engine?
At constant full throttle, the turbine I was holding in the video burns 1 litre of fuel every 3 minutes.
can you power a jet turbine with propane gas
If it will burn and you can control it, it can work.
Can anyone please send me cad file (which has all the parts) of such jet engine
Much less living room, leaving much more the image for the engine, would greatly improve the opening segment (the first third of the video).
At 150,000 rmp the compressor tips are at mach 2.3, at adle the compressor gas flows are sub sonic, but not by a lot. Designing these things is a black art, not a science. If anyone tells you he that really understands what is going on, he lies. Still, hats off to the guys who did get these things to work in the end, because when I was first interested in 1970, there were quite learned engineering articles explaining how model scale gas turbines could never be made to work at all. One needs to understand that bumble bees can really fly, but according to standard aeordynamics they could not fly at all. Think of the hot gas as more like white hot treakle and you are getting there. A blast of hot gass at mach 2 on the turbine stator is more like a shower of tiny rubber bullets than we can even imagine. Think of those tiny rubber bullets as all being connected together by a property that we call viscosity. The work that we have to thank for all this started with heavy military helicopter starter motor gas turbines and moved on to your turbo diesel truck and later even my 1.5 dci turbine charger.
what happen to the motor in front of the engine you hold that ussd for starting the engine? your explanation is enermously talking only the combustion chamber only not entirely, for example the motor for starting the engine from dead cold
Hello Kodox. The motor is talked about at 1:00 and again around 2:34.
I have a dumb question . Why do others have propane and also kerosene ?
Hey Francis. It's not a dumb question, all questions are welcomed on this channel! And thank you for yours!
The propane is used as starting fuel since at room temperature it already exists in gaseous form. Thus it's easier to ignite. Once the propane ignites kerosene can be introduced and the propane is then shut off.
A kerostart turbine requires heating up the kerosene in order to turn it in to gas form to start the turbine.
@@RCexplained thank you very much ! I learned a lot because of your channel .
@@RCexplained The term "kerostart" would have made more sense if you included this in the video: it means starting on just the engine's normal fuel (kerosene), instead of starting on a special starting fuel (such as propane).
RCexplained Why model Gas jet engines produce more thrust than EDFs the same diameter ? Could an EDF reach the same thrust that a Gas jet with a powerful compact electric motor ?
Answered this on the comment you left on this video: th-cam.com/video/mVYfRFzvBQU/w-d-xo.html
For much more detail on how combustion chambers and turbines work in general visit the AgentJayZ channel here on TH-cam. Yes, he rebuilds and describes full size jet engines, but the fundamentals are the same. His channel is a priceless resource if you build DIY turbojets or simply want a deeper understanding of the details of turbojet operations. Since he has hundreds of videos it is helpful to use the channel search function, perhaps starting with "combustor" since he has great details on that.
Why hello their Tom Brainy
Lol, I see what you did there. 🤣
hi Ryan,
I emailed an RC turbine manufacturer asking why RC turbines do use bypass fans given they are capable of up to 80% thrust (ref RR)..
No answer
Hey HiTekHead. Assuming you actually meant "do not use." I would expect the reason RC turbines do not use bypass fans is purely due to cost. Most turbine guys are not worried about fuel consumption. The biggest difference you would get by using bypass fans is better fuel efficiency. However there is a cost to this as well as the extra complexity.
Some 🚄 are oil & Electric !
Why burn fuel in engine what is use of burning fuel in engine what is science
Not sure what you are asking?
@@RCexplained why fuel burning in jet engine for fire what is reason
@@Royaltech91 The expanding gases create the potential for power.
@@RCexplained bro please make a video how to make a jet engine
That would be tough as I've never made a jet engine.
There is only 1 spark plug/ignitor right? Like there arent more then 1 inside like a real commercial turbofan th-cam.com/video/L24Wf0VlTE0/w-d-xo.html 1:47 seconds on that video. I just wanted to make sure. By the way nice job on the 3d printed model it looks like u put a ton of effort into it and it payed off with a good explanation, the spark plug question is my only question.
like is there a igniter on the bottom and top or just the top?
Is that Tom Brady
I know... its a short haired Brady with glasses lol
hi sir im interested
Right on!
Looks like a big expensive piece of junk tbh.
Aww is someone a little jealous?
Doesn’t clearly shows how fuel is delivered
Hope this helps: th-cam.com/video/9On_PlQItPI/w-d-xo.html
What the name of viewer you r used ?
It's a design software package.
Its Solidworks.