You know what, good for you dude. Not enough people experiment any more. I just finished a class in compressible flow last semester, and we talked about turbines, and air flows, etc. It is cool to see someone try and build an after burner for the hell of it. If you are going to mod the design, lemme know, and I'll send any help I can your way.
@LostDeadSoul On our engine, we make the AB the same diameter as our combustion chamber. We didnt have a flame holder directly inline with the flow, but used the step up from 3.5" to 5" as a recirculation zone.
You can increase the amount thrust by bending the copper tube into a circle and then drilling holes. The hole at the end should have 2 holes spaced closely so that they act as one and the amount of fuel mixed in the air will be equal. The amount of fuel mixed in the air from the last hole will hence be equal to the first hole.
Its just an electric grill ignition system, picked it up from home depot for like $20. Its not a high current system like most jet projects use, but its cheap and gets the job done, which is what my builds are all about, so tested it and used it.
@9unuunu I think i put 3 to 4 holes on each section of the X, about 2 to 3 mm in diameter, you want them as small as possible to help spread the fuel. What would be ideal is to get your hands on a atomizer spray nozzle.
Fundimentally most enthusists do not understand how to design a true AB, not flame thrower, because of a lack of understanding of basic thermodynamics, in simple layman terms the engine needs a more efficient/powerful compressor to over come the back pressure of the combustion pressure of the AB. So either a staged axial compressor,high efficiciency centrifugal 'impeller' or a combination of both like the famous most mass produced Rolls Royce/Allison 250 helicopter turboshaft engine is needed. Also a pressure ratio of over 2/1 is needed to obtain supersonic flow, that's >2 atmospheres i.e.30 psid,45 psia in the AB chamber or greater. This is referanced at sea level conditions. Those little Commercial Off The Shelf (COTS) RC turbojets don't have effiecient enough compressors to acchieve the pressure ratios needed like over 5/1,military turbojets have 10/1 to 30/1, that's over 400psi of compressed air at 700F at 10,000's of CFM or more. That's barily the basics but gets us in the ball park and right of left field.
Correct me if im wrong ,what if im going to modify or to change some of the component of the rc G.T.E. but (not the size) like fuel lines,high pressure fuel pump,add turbine blades( no im not saying adding 2nd stage),adding blade in the centrifugal compressor and modify the combustion liner. Do u think i could increase the engine thrust?
@crazystufffff Actually an afterburner doesn't have a "chamber", it has a jet pipe and liner. Also they do burn fuel aft of the nozzle thats why you can see the flame past the nozzle when in full A/B. Yes my flame holder is close to the nozzle, but I specifically designed it that way so as much of the flame was in view as possible.
@AKZak08 The piping is made for heat, plus the way i designed it, it doesn't get hot, I can hold the very end of the nozzle with my bare hands with it at full throttle and it only gets warm to the touch, so yea, no death part lol
Its a electric radial blower from a grooming dryer used to blow the water off whatever your trying to dry, so its high pressure output was perfect for what I was using it for.
@1950dodgefan as long as you ignite the fuel with the fan on, the flame will not go into the back of the edf, and once the spark ignited the fuel, it is no longer needed until you turn the fuel off.
@shadowfaithx idk about the subject, I built this right out of high school, I read a book in middle school on fundamental of design and theory of operation on jet engines and started researching historic turbines and the different designs they went through. Then started designing combustors and went to afterburners right before I joined the corps.
@juanelectricidad18 the compressor is a single stage radial electric blower, my next design will use a three stage 5.7" diameter electric radial compressor, which will provide a higher pressure for the combustor
@rbmaserang yea im re-learning all the physics since I first learned them reading a book on jet engines in the 8th grade, so im catching up. also, i had to use the electric compressor for the afterburner, because for one thats all i had to work with, and two, an afterburner does actually run in high velocity, high dynamic pressure air flow, not lower dynamic pressure, higher static pressure slower air like a combustor.
@goata007 Correct. A micro turbine would work, but you would also have to have a advanced afterburner and nozzle as well to create the proper circumstances for clearly visible mach rings.
@gusmarr1 This is not a combustion chamber design, its an afterburner design. There is no combustion chamber in afterburners, only flame holders and the jet pipe. In all afterburners most of the fuel is burned aft of the nozzle. Just because the fuel is burned aft of the nozzle doesnt mean no thrust is produced. In rocket engines 90% of the fuel is burned aft of the engine bell, yet it still produces thrust. Its kinda a hard concept to understand, but it just works that way.
@crazystufffff This is true. I used propane because of a lack of funds and materials (like a fuel pump) at the time. My goal was to make it as simple as possible with what I had to work with. Also I really need a higher air flow and pressure to get any real thrust out of this design. It was basically made for just a nice big blue flame. Im hoping to incorporate an afterburner design when I finally do make a turbocharger based jet.
Hey! Thanx for the video man! I was looking around and thouhgt that it would be better to take a turbocharger and use that, but I was woried that the blower is not gonna be strong enough! So I could just try a normal electric engine and use that for compresing the air or is it to bad?
@nikorasu888 no fuel pump, the fuel i used was propane so the pressurized fuel cylinder gave the system the pressure to flow. I wanted to use propane specifically so i didn't have to use a fuel pump.
@JetAce08 Nope, look at my video you will see. Our engine is much much larger than a RC jet engine, it was a project for school so we had a lot of instrumentation on the engine as well and could monitor the tempers in each region. The only problem with over heating was when you hear the howling in our video. This is a type of resonance, every engine will have it at some point in its range and it creates unstable combustion in that range.
@Helicopterpilot16 I know! i love the J79 sound, its freakin epic! i kinda wanted to, but ran out of time before i joined the corps, plus they are complicated.
@scorpion00021 I am not saying a compressor is used during the afterburn stage, I was talking about two different topics entirely. Besides, he does use some sort of compressor, it is stated in the description above...
@9unuunu The pic at .22 is looking downwind of the flame holder, the air enters the side your looking at and exits the back, in 1.18 your looking upwind, or where the air exits. So yes your correct, the way i show it in .22 is reversed from when I show it at 1.18, mainly to show the fuel line.
@rhapsody2m Yes, you are correct about the air flow and how it works, and i can see how this looks like a torch. It looks this way due to the air flow being too low in pressure to properly burn the injected fuel. A torch uses the pressure of the gas to "pull" in air and burn, where in this case, the gas is simply put into the air stream and burns aft of the flame holder. Yes, this is not a turbine engine AND afterburner, but is is very much so an afterburner like one aft of a real turbine engine
@JetAce08 there will be some fuel burnt out the nozzle but the majority of combustion must be in the pipe. im not critising your design, but what i am saying is that i think you will get little or no thrust from the 'afterburner' you have designed. i would get rid of the propane your using and get a fuel pump and pump kerosene or diesel. then if you move your flame holder and injection system further back you will actually get a decent amount of thrust from your afterburner and a nice big flame!
@JetAce08 my understanding was that the exhaust velocity had to be supersonic + there needs to be a pressure difference for mach disks to occur. I read that the exhaust velocity of a JetCat turbine at full-throttle can hit 1300mph - which is supersonic speed. So I think its all down to pressure difference, is it possible at all to create mach rings on an RC turbine? I think it'll look really cool :D
@heavym3tal Thanks man, experimenting is my interest in life, im goin to build a larger diameter afterburner using the 10" diameter axial bower I have. The air wont be as high in pressure as my first one, but it will be a greater flow, I will post it when I build it. Right now my focus is on my JT8D combustor build (I have some videos up of that one).
I have since moved and no longer have vital pieces to rebuild this project. However I will be building an entire new design using an old J78 combustion liner and a similar air source that I will post a basic video on as I build it.
@goata007 its not smooth because the air flow though it isnt fast enough, or at a high enough pressure. Its very hard for a small home made system to get mach rings.
Hey I have asked u questions before. But one more for ya is both ends of your tail pipe open and what direction do the flame holder and fuel system go. Thanks
@TheSwagDay I used a propane grill tank hose with a built in valve. then just basic plumbing parts from a hardware store. I recently uploaded a new afterburner video that explains its construction a bit better
@michelarjuna I wont ever get to actually go to college for it, but I plan on learning as much as I can though all my ongoing experiments, im about at final plans and ready for production of my newest chamber project (now that I have money)
@shadowfaithx lol well its kinda a rough build, and I think I want to rebuild it if im going to sell it. Plus it will be fun to work on an old project before I get back into building and start my best project yet.
@bi00110 If it is the "Compressor" section that you are looking for, you wont find it inside the "afterburner." The compressor is the last stage of the engine before the afterburner. If he put a compressor on his build, it would be a bit foolish without the rest of the jet engine. He has a fan to demonstrate the burn pattern of his afterburner, bbut I think he might need higher air velocity to simulate its functionality.
@sirsmorkmo Thank you :) I dont have very specific plans on my designs. They are mostly designed in my head and I use windows Paint as a simple sketch design visual. Now that im stuck in the barracks I cant make anything. My latest video is a description of my newest project. So far I still have many pieces to obtain but i'm hoping to finish it within a couple of months or so building it in a friends garage (if she lets me). I will probably make a couple of vids describing it further as I go.
it seems that in the picture of the fireholder at 0.22, the photo was taken from the back of the engine, soo how come, at 1:18, in the engine i see only the bent metal sheets after the cooling fan grill???and not the fuel pipe,fan grill,metal sheets, did you revers the flameholder?
thats a very interesting design. ive been working on developing a pulse jet engine for sometime. currently im stationed at MCAS Beaufort SC working on F18's. Where did you end up and on what platform?
Hi. Some while ago, i made me a gasoline turbojet engine and so i have been thinking about making a afterburner on it. But there are ofcourse some basic fysics about it, and have got me thinking of, how to get the most out of it. So if your a aviation mechanic you might have some answeres or some suggestions. Since a turbojet engine is a reaction engine, its the reaction part i'm thinking about. Should'nt the afterburner chamber be bit bigger than the turbo exhaust for more reaction areal ?
also, a tubing bender would be amazing, if i had one, realize i did this with tin snips, screwdriver, needle nose pliers and...well i think that was it. but thanks for viewing
@scorpion00021 Thats been a dream of mine for the longest time, but i had no tools and enough money to build it, and now that im stuck in the barracks theres no room to build anything. But I have moved on to my visual chamber design, this way its a simple build and i get to have fun with it. I do plan on building a massive turbocharger based jet engine in the future though.
@LostDeadSoul you can make it a bit bigger, but generally when your dealing with small R/C size engines the A/B is bigger then the turbine exhaust so its easier to build. The biggest issue when building a home made A/B is heat. Most garage A/Bs glow red hot when running. In an actual fighter jet the A/B has a liner much like a combustor liner, which engine air flows between the outer afterburner casing and the inner liner for cooling. I can send ya diagrams and such if you would like.
thanks man! and if you don't mind , i have another question : how many holes did you made in the fuel tube?? and if you could tell me how big they are i would very much apreciate that :)
@ruggero33 The only difference in my flame holder and a actual one is mine is in the shape of a "X" and a real A/B are usually ring shaped. As for the electronic ignition, i dont know what you mean the electric spark must "kill" power as it happens, but also in a actual A/B, most are ignited by a torch ignitor, which IS ignited by a spark plug. Also, if by "jetpulse" you mean "pulse jet", they are very different. I can explain if you are interested.
@2011aviator that would be my wildest dreams but i got into the corps to be a engine mechanic, ended up not getting it. im shooting to work at edwards AFB doing what im doing for the corps now.
for a while now iv been trying to finde how to build one of these, could you send me a copy of the blue prints and details? i would be much appreciated.
Hey there I'm trying to make an afterburner for my model airplane I don't really know what I'm doing is there any advice or something that you can give me that will help me out on this
ethan zarian “agent jay z” is an awesome youtuber that works on J79 turbojet engines, and has several vids on afterburners. Definitely check out his channel. The purpose of an afterburner is to use the rapid increase in temp of the burning fuel to expand the gases, or in a ducted fan case the air. This then forces the gases to increase in velocity, creating additional thrust. The biggest issue is the additional weight in fuel, as well as the complexity in the whole system, to a RC aircraft that isn’t designed for the additional weight. Though there are videos of people who have done it on here.
Thank you and I understand that but but I'm really trying I've been wanting to make model airplanes for a long time now and this is something that I'm just not really good at I just don't really have the money for these kind of things but when the day comes I want to have the know how to be able to do it or be able to get one from somewhere
ethan zarian I understand, trust me. If your seeking general knowledge definitely give Agent jay Z channel, he gives fantastic explanation on all parts of jet engines.
Thank you I'm checking them out right now what I really want though is something that I can just buy And stick onto my model jet engine but I guess if I'm going to have to make one myself I guess I have no choice if there are none that exists in the market
Instead of being negative, I would like to contribute some helpful information. Go to the junkyard and pick up a turbo kit. It will make your project more "authentic." If you need any help with the build, send me a message.
I've wondered why an A-10 doesn't have afterburner on its engines, for more rapid departure? Is it the fuel capacity and consumption, (not-very) aerodynamics, engine mounts/stress on frame, ??? "To keep a flame lit in direct high-pressure air current"..... meaning the back end of fans under acceleration, the release of fuel into that chamber? Does this mean afterburner is not like a turbo added to a car engine, but a necessary part to keep the flame lit under all demand? What aircraft do you spend most time working on in Marine Corps? Cool project....so to speak..... the bends in the copper on the fuel system- could you have used braided stainless tubing instead?
Added weight, added thrust, longer engine due to afterburner chamber which means more drag whenever it's not flying at 0º AOA (ie, when maneuvering), etc. You pretty much answered yourself.
@bi00110 K, once again, your wrong, a "turbine" extracts energy from a flow, it DOES NOT compress air, that is done by the "compressor". And again, I did not say this was a "turbine engine" i said it was an "afterburner design" which if you want to accept it or not, is dam close to a real afterburner. I have been studying jet engines since fucking middle school. I literally drive by power plants shop every day and have friends who actually build the things. At least know what your talking about.
very nice design. it is nice to see that people know what they are doing and are going somewhere with it
You know what, good for you dude. Not enough people experiment any more. I just finished a class in compressible flow last semester, and we talked about turbines, and air flows, etc. It is cool to see someone try and build an after burner for the hell of it. If you are going to mod the design, lemme know, and I'll send any help I can your way.
@LostDeadSoul On our engine, we make the AB the same diameter as our combustion chamber. We didnt have a flame holder directly inline with the flow, but used the step up from 3.5" to 5" as a recirculation zone.
You can increase the amount thrust by bending the copper tube into a circle and then drilling holes. The hole at the end should have 2 holes spaced closely so that they act as one and the amount of fuel mixed in the air will be equal. The amount of fuel mixed in the air from the last hole will hence be equal to the first hole.
Pranav I'm looking for someone who can help me build a afterburner for my 1/4 scale f-18 super hornet
Its just an electric grill ignition system, picked it up from home depot for like $20. Its not a high current system like most jet projects use, but its cheap and gets the job done, which is what my builds are all about, so tested it and used it.
@9unuunu I think i put 3 to 4 holes on each section of the X, about 2 to 3 mm in diameter, you want them as small as possible to help spread the fuel. What would be ideal is to get your hands on a atomizer spray nozzle.
@AYXFF Its a replacement electronic grill ignitor that I got from home depot (or any hardware store). They cost $20-$30.
@nikorasu888 correct, i use a propane grill fuel tank and needle valve replacement to control the fuel flow. It is shown in frame 0:34
Fundimentally most enthusists do not understand how to design a true AB, not flame thrower, because of a lack of understanding of basic thermodynamics, in simple layman terms the engine needs a more efficient/powerful compressor to over come the back pressure of the combustion pressure of the AB. So either a staged axial compressor,high efficiciency centrifugal 'impeller' or a combination of both like the famous most mass produced Rolls Royce/Allison 250 helicopter turboshaft engine is needed. Also a pressure ratio of over 2/1 is needed to obtain supersonic flow, that's >2 atmospheres i.e.30 psid,45 psia in the AB chamber or greater. This is referanced at sea level conditions. Those little Commercial Off The Shelf (COTS) RC turbojets don't have effiecient enough compressors to acchieve the pressure ratios needed like over 5/1,military turbojets have 10/1 to 30/1, that's over 400psi of compressed air at 700F at 10,000's of CFM or more. That's barily the basics but gets us in the ball park and right of left field.
Correct me if im wrong ,what if im going to modify or to change some of the component of the rc G.T.E. but (not the size) like fuel lines,high pressure fuel pump,add turbine blades( no im not saying adding 2nd stage),adding blade in the centrifugal compressor and modify the combustion liner. Do u think i could increase the engine thrust?
@crazystufffff Actually an afterburner doesn't have a "chamber", it has a jet pipe and liner. Also they do burn fuel aft of the nozzle thats why you can see the flame past the nozzle when in full A/B. Yes my flame holder is close to the nozzle, but I specifically designed it that way so as much of the flame was in view as possible.
@AKZak08 The piping is made for heat, plus the way i designed it, it doesn't get hot, I can hold the very end of the nozzle with my bare hands with it at full throttle and it only gets warm to the touch, so yea, no death part lol
Its a electric radial blower from a grooming dryer used to blow the water off whatever your trying to dry, so its high pressure output was perfect for what I was using it for.
@1950dodgefan as long as you ignite the fuel with the fan on, the flame will not go into the back of the edf, and once the spark ignited the fuel, it is no longer needed until you turn the fuel off.
@shadowfaithx idk about the subject, I built this right out of high school, I read a book in middle school on fundamental of design and theory of operation on jet engines and started researching historic turbines and the different designs they went through. Then started designing combustors and went to afterburners right before I joined the corps.
@danthemanzizzle na, its propane gas, so it gathers behind the metal where there is no wind, thats where it ignites and burns on further downstream
@juanelectricidad18 the compressor is a single stage radial electric blower, my next design will use a three stage 5.7" diameter electric radial compressor, which will provide a higher pressure for the combustor
@rbmaserang yea im re-learning all the physics since I first learned them reading a book on jet engines in the 8th grade, so im catching up. also, i had to use the electric compressor for the afterburner, because for one thats all i had to work with, and two, an afterburner does actually run in high velocity, high dynamic pressure air flow, not lower dynamic pressure, higher static pressure slower air like a combustor.
It was propane as well, easy to find and simple to build a custom fuel system.
@goata007 Correct. A micro turbine would work, but you would also have to have a advanced afterburner and nozzle as well to create the proper circumstances for clearly visible mach rings.
@gusmarr1 This is not a combustion chamber design, its an afterburner design. There is no combustion chamber in afterburners, only flame holders and the jet pipe. In all afterburners most of the fuel is burned aft of the nozzle. Just because the fuel is burned aft of the nozzle doesnt mean no thrust is produced. In rocket engines 90% of the fuel is burned aft of the engine bell, yet it still produces thrust. Its kinda a hard concept to understand, but it just works that way.
@crazystufffff This is true. I used propane because of a lack of funds and materials (like a fuel pump) at the time. My goal was to make it as simple as possible with what I had to work with. Also I really need a higher air flow and pressure to get any real thrust out of this design. It was basically made for just a nice big blue flame. Im hoping to incorporate an afterburner design when I finally do make a turbocharger based jet.
Hey! Thanx for the video man! I was looking around and thouhgt that it would be better to take a turbocharger and use that, but I was woried that the blower is not gonna be strong enough! So I could just try a normal electric engine and use that for compresing the air or is it to bad?
@nikorasu888 no fuel pump, the fuel i used was propane so the pressurized fuel cylinder gave the system the pressure to flow. I wanted to use propane specifically so i didn't have to use a fuel pump.
@JetAce08 Nope, look at my video you will see. Our engine is much much larger than a RC jet engine, it was a project for school so we had a lot of instrumentation on the engine as well and could monitor the tempers in each region. The only problem with over heating was when you hear the howling in our video. This is a type of resonance, every engine will have it at some point in its range and it creates unstable combustion in that range.
Check the испытание форсажной камеры 2.VOB named video, where you can see an another rc jet afterburner with variable diameter nozzle.
That is so good, This would be a fantastic heater what temp will it produce. would love to have one. Well done you.
@Helicopterpilot16 I know! i love the J79 sound, its freakin epic! i kinda wanted to, but ran out of time before i joined the corps, plus they are complicated.
@scorpion00021 I am not saying a compressor is used during the afterburn stage, I was talking about two different topics entirely. Besides, he does use some sort of compressor, it is stated in the description above...
@9unuunu The pic at .22 is looking downwind of the flame holder, the air enters the side your looking at and exits the back, in 1.18 your looking upwind, or where the air exits. So yes your correct, the way i show it in .22 is reversed from when I show it at 1.18, mainly to show the fuel line.
@rhapsody2m Yes, you are correct about the air flow and how it works, and i can see how this looks like a torch. It looks this way due to the air flow being too low in pressure to properly burn the injected fuel. A torch uses the pressure of the gas to "pull" in air and burn, where in this case, the gas is simply put into the air stream and burns aft of the flame holder. Yes, this is not a turbine engine AND afterburner, but is is very much so an afterburner like one aft of a real turbine engine
Hi! Would you mind sharing the materials and the process of creating an afterburner? Thank you!!
@JetAce08 there will be some fuel burnt out the nozzle but the majority of combustion must be in the pipe. im not critising your design, but what i am saying is that i think you will get little or no thrust from the 'afterburner' you have designed. i would get rid of the propane your using and get a fuel pump and pump kerosene or diesel. then if you move your flame holder and injection system further back you will actually get a decent amount of thrust from your afterburner and a nice big flame!
@JetAce08 my understanding was that the exhaust velocity had to be supersonic + there needs to be a pressure difference for mach disks to occur. I read that the exhaust velocity of a JetCat turbine at full-throttle can hit 1300mph - which is supersonic speed. So I think its all down to pressure difference, is it possible at all to create mach rings on an RC turbine? I think it'll look really cool :D
@heavym3tal Thanks man, experimenting is my interest in life, im goin to build a larger diameter afterburner using the 10" diameter axial bower I have. The air wont be as high in pressure as my first one, but it will be a greater flow, I will post it when I build it. Right now my focus is on my JT8D combustor build (I have some videos up of that one).
I have since moved and no longer have vital pieces to rebuild this project. However I will be building an entire new design using an old J78 combustion liner and a similar air source that I will post a basic video on as I build it.
@goata007 its not smooth because the air flow though it isnt fast enough, or at a high enough pressure. Its very hard for a small home made system to get mach rings.
Hey I have asked u questions before. But one more for ya is both ends of your tail pipe open and what direction do the flame holder and fuel system go. Thanks
@amarshall87 thats interesting, did it have any overheading problems on the jet pipe?
@TheSwagDay I used a propane grill tank hose with a built in valve. then just basic plumbing parts from a hardware store. I recently uploaded a new afterburner video that explains its construction a bit better
@michelarjuna I wont ever get to actually go to college for it, but I plan on learning as much as I can though all my ongoing experiments, im about at final plans and ready for production of my newest chamber project (now that I have money)
@shadowfaithx lol well its kinda a rough build, and I think I want to rebuild it if im going to sell it. Plus it will be fun to work on an old project before I get back into building and start my best project yet.
@bi00110 If it is the "Compressor" section that you are looking for, you wont find it inside the "afterburner." The compressor is the last stage of the engine before the afterburner. If he put a compressor on his build, it would be a bit foolish without the rest of the jet engine. He has a fan to demonstrate the burn pattern of his afterburner, bbut I think he might need higher air velocity to simulate its functionality.
@sirsmorkmo Thank you :) I dont have very specific plans on my designs. They are mostly designed in my head and I use windows Paint as a simple sketch design visual. Now that im stuck in the barracks I cant make anything. My latest video is a description of my newest project. So far I still have many pieces to obtain but i'm hoping to finish it within a couple of months or so building it in a friends garage (if she lets me). I will probably make a couple of vids describing it further as I go.
it seems that in the picture of the fireholder at 0.22, the photo was taken from the back of the engine, soo how come, at 1:18, in the engine i see only the bent metal sheets after the cooling fan grill???and not the fuel pipe,fan grill,metal sheets, did you revers the flameholder?
thats a very interesting design. ive been working on developing a pulse jet engine for sometime. currently im stationed at MCAS Beaufort SC working on F18's. Where did you end up and on what platform?
Hi. Some while ago, i made me a gasoline turbojet engine and so i have been thinking about making a afterburner on it.
But there are ofcourse some basic fysics about it, and have got me thinking of, how to get the most out of it.
So if your a aviation mechanic you might have some answeres or some suggestions.
Since a turbojet engine is a reaction engine, its the reaction part i'm thinking about. Should'nt the afterburner chamber be bit bigger than the turbo exhaust for more reaction areal ?
also, a tubing bender would be amazing, if i had one, realize i did this with tin snips, screwdriver, needle nose pliers and...well i think that was it. but thanks for viewing
Very thanks now in 2023. It's still usefull.
@scorpion00021 Thats been a dream of mine for the longest time, but i had no tools and enough money to build it, and now that im stuck in the barracks theres no room to build anything. But I have moved on to my visual chamber design, this way its a simple build and i get to have fun with it. I do plan on building a massive turbocharger based jet engine in the future though.
@JetAce08 All you have designed is a fancy fuel dump system. afterburners burn the fuel in the chamber, not out.
@JetAce08 will u tell me what subject is needed to create this ??
i'm aiming as aircraft engineering for my ambition ...
@LostDeadSoul you can make it a bit bigger, but generally when your dealing with small R/C size engines the A/B is bigger then the turbine exhaust so its easier to build. The biggest issue when building a home made A/B is heat. Most garage A/Bs glow red hot when running. In an actual fighter jet the A/B has a liner much like a combustor liner, which engine air flows between the outer afterburner casing and the inner liner for cooling. I can send ya diagrams and such if you would like.
thanks man! and if you don't mind , i have another question : how many holes did you made in the fuel tube?? and if you could tell me how big they are i would very much apreciate that :)
@ruggero33 The only difference in my flame holder and a actual one is mine is in the shape of a "X" and a real A/B are usually ring shaped. As for the electronic ignition, i dont know what you mean the electric spark must "kill" power as it happens, but also in a actual A/B, most are ignited by a torch ignitor, which IS ignited by a spark plug. Also, if by "jetpulse" you mean "pulse jet", they are very different. I can explain if you are interested.
wouldn't it be more efficient with proper fuel jets?I'm thinking of making one and I plan to use a paint gun jet
Nice job!! And thanks for being in the armed force .. your appreciated
just wondering what you used for an ignition system
@2011aviator that would be my wildest dreams but i got into the corps to be a engine mechanic, ended up not getting it. im shooting to work at edwards AFB doing what im doing for the corps now.
how is made the irternal fan and compressor?....
Will it ever melt the edf and do u need constant spark
That's awesome. Now you need to work on diffuser and nozzle design.
Hi there can you make a video how to make this step by step so I can
for a while now iv been trying to finde how to build one of these, could you send me a copy of the blue prints and details? i would be much appreciated.
Hey there I'm trying to make an afterburner for my model airplane I don't really know what I'm doing is there any advice or something that you can give me that will help me out on this
ethan zarian “agent jay z” is an awesome youtuber that works on J79 turbojet engines, and has several vids on afterburners. Definitely check out his channel. The purpose of an afterburner is to use the rapid increase in temp of the burning fuel to expand the gases, or in a ducted fan case the air. This then forces the gases to increase in velocity, creating additional thrust. The biggest issue is the additional weight in fuel, as well as the complexity in the whole system, to a RC aircraft that isn’t designed for the additional weight. Though there are videos of people who have done it on here.
Thank you and I understand that but but I'm really trying I've been wanting to make model airplanes for a long time now and this is something that I'm just not really good at I just don't really have the money for these kind of things but when the day comes I want to have the know how to be able to do it or be able to get one from somewhere
ethan zarian I understand, trust me. If your seeking general knowledge definitely give Agent jay Z channel, he gives fantastic explanation on all parts of jet engines.
Thank you I'm checking them out right now what I really want though is something that I can just buy And stick onto my model jet engine but I guess if I'm going to have to make one myself I guess I have no choice if there are none that exists in the market
Are there anything like this that I can just buy in the RC Market or does that not exist yet
Pretty cool!
how much thrust does it generate
@BrokenAeroVT cool, thanks for the tip
does it give any additional horsepower in return?
Yea, I have always been curious the difference between JP-5 and propane
Does afterburner add more thrust?
Please reply
@shadowfaithx yea, im a cryogenic tech stationed at MCAS Miramar in san diego, CA
What is the fuel and ignition source?
hi there!! can you sent me some tutorial on how to build this afterburner? im planning to make one also just for fun.. thx in advance
How does an afterburner help a car ?
does your afterburner ignites from the hot gasses or you used a spark to fire it up ?
what kind of fuel are you running in your AB?
You should try and design a variable nozzle! and even better yet make it sound like a F-104's J79 Afterburner!
Instead of being negative, I would like to contribute some helpful information. Go to the junkyard and pick up a turbo kit. It will make your project more "authentic." If you need any help with the build, send me a message.
Ok what did u use to spark it
i wish i knew how to biuld something like that.
@BlankBox7 yep, one of my ideas for it
how much thrust you getting with this setup?
@shadowfaithx lol..ya know, i am thinking of putting it up on ebay after i rebuild it
why isn't it smooth like F-22's afterburner...it'd be really nice if you can get mach rings/disks.
@BrokenAeroVT lol, I know right! you have no idea how many times i thought how lame that looked to be a "jet engine"
@shittywilly its uses a spark from a electric grill ignitor to start
I've wondered why an A-10 doesn't have afterburner on its engines, for more rapid departure? Is it the fuel capacity and consumption, (not-very) aerodynamics, engine mounts/stress on frame, ???
"To keep a flame lit in direct high-pressure air current"..... meaning the back end of fans under acceleration, the release of fuel into that chamber? Does this mean afterburner is not like a turbo added to a car engine, but a necessary part to keep the flame lit under all demand?
What aircraft do you spend most time working on in Marine Corps?
Cool project....so to speak..... the bends in the copper on the fuel system- could you have used braided stainless tubing instead?
Added weight, added thrust, longer engine due to afterburner chamber which means more drag whenever it's not flying at 0º AOA (ie, when maneuvering), etc. You pretty much answered yourself.
what did u use for the compressor?
Thanks
you're my hero !...
How long does the fuel last?
DreamAboutSpace mmmm about 10 seconds haha
Its an ignitor coil off an electric grill sparker
@shadowfaithx lol, well thank you.
imagine that coming out of your cars exhaust!
@JetAce08 what corps ?? MARINE CORPS ?!!?!?!
You should study aerospace engineering
Keep experimenting!
Yes
Thanks im going to use a big coffee thermos
Sweet.
@bi00110 K, once again, your wrong, a "turbine" extracts energy from a flow, it DOES NOT compress air, that is done by the "compressor". And again, I did not say this was a "turbine engine" i said it was an "afterburner design" which if you want to accept it or not, is dam close to a real afterburner. I have been studying jet engines since fucking middle school. I literally drive by power plants shop every day and have friends who actually build the things. At least know what your talking about.