Hi David, I've always wanted to make one too. Yes there is a flame holder in the burner can, still needs some work to get it right though, at high rpms the flame is very inconsistent. I had to use a hot-streak to light the A/B as well. not easy to do on such a small engine.
Dave, The "hot-streak" is a small nozzle which introduces fuel into the combustion chamber in a fine jet, this momentarily shoots a small flame through the turbine and lights the fuel within the A/B. I tried the glow plug approach but it failed misserably. Cheers, Smithy.
@knobby4 true, turbojets don't bypass air around the core, but they do direct some air further into the combustion can(s) to shape the flame. This is called primary, secondary and tertiary airflow, only the primary gets burn't which is about 60% if I remember correctly. Secondary and tertiary air doesn't get burn't, therefore it's oxygen rich, making afterburners possible in turbojets.
Hey Chevy, Yes, the A/B fuel tank is now a 1 litre saline bag which now sits between the frame rails, the engine fuel tank is the same but only 500mls. Doesn't last long at all..!! Cheers, Smithy.
@vtwinmesa true, there are differences between turbofan, tubojet, turboshaft and turboprop engines. Turbofan does bypass most of its air around the core, whereas turbojets takes the whole mass airflow through the core as there is no bypass, however, some air in all engines doesn't mix with the fuel, it is directed further back in the can to shape the flame into what is known as a toroidal vortex. this air is called primary, secondary and tertiary airflow. Only the primary air is burnt, secondary
Awesome job knobby4 ! I love watching rc jets at the flying field, this is a whole different level. How do you stop it , does it have brakes like a jet?
You're quite right, it is fairly slow off the mark, but has plenty of top end speed, 183.56kmh so far, recorded at WSID drag strip just over a week ago. Cheers, Smithy.
@knobby4 hmmm yes, heard that before, but air at that temperture has very few oxygen, but certainly some left. when the a/b is on does it burn inside the a/b chamber too or just outside as seen in this video?
Hey Cyclops, To be honest, I haven't had it flat out, I always run out of room first, plus when it is a long way away it can get difficult to control. Turbines don't have the throttle response of a piston engine and things take time to happen. I've had her up to a measured 143kmh but she's capable of a lot more I suspect, I just don't have the balls to do it yet!! Cheers, Smithy.
Hi PB, yes the A/B is custom made, took me many months to just get it to light let alone make any extra thrust, I get about 30% extra thrust out of it now. Cheers, Smithy.
Hi Dude, The afterburner or "re-heat" is used for thrust augmentation, in some cases it can add ~40% or more to the normal thrust output, in this case it is ~30%....but uses 150% more fuel, not really fuel efficient..!!! Cheers, Smithy.
Jet A-1 mixed with 5% Mobil Jet II oil for the engine and usually just straight Jet A for the A/B but here I am just using the same as I already had it pre-mixed. Cheers, Smithy.
a thing about afterburners few realize is that in a turbo fan engine there is a flow of fresh air supplied to the afterburner stage, but in a jet engine that is not possible. I spend a lot of time thinking about this and the only option I see is to build a ram air cone around the engine that would do the trick but only from a certain speed upwards , at zero speed not applicable
The engine itself runs on real jet fuel... Jet A-1 with 5% turbine oil (Mobil Jet-II) mixed in with the fuel. The bearings are lubed by this fuel and the lube flow is then burnt out the back, a total loss lube system. I use the same fuel for the A/B system mainly because I have it already mixed, but straight Jet A-1 also works very well. Cheers, Smithy.
Ive built alot of models over the years, but ive never seen anything like that! Pretty damn cool! Did you build it yourself? How did you actually make a working afterburner? Ide like to see it in action.
Hi Martijn, You're quite right of course, I have radio which can vary the servo travels etc...the only problem is that just a tiny movement of the servo has a major effect on the turning of the car at high speed, under ~45kmh it's not bad at all, but get very "twitchy" at higher speeds....very scary indeed. Cheers, Smithy.
Hi Martijn, The car is capable of well in excess of 160kmh, however it's very difficult to control at this speed, the steering is very direct and a lot of "expo" is dialed in to help, I'm still working on the steering to try and reduce the rate. The engine produces more than enough thrust to achieve this sort of speed, keeping it in a straight line it the hard part. Cheers, Smithy.
Im in the design stages of building my own RC Turbine. Can you tell me what brand Turbine you are using? I was looking at the Jet Cat P100. Do you have any recommendations on turbine selection? Any help would be greatly appreciated. Thank you :)
@knobby4 the full size jet machines are the same way off the line they are slow but just look at the other end of the track, i figure this is because they are driven by thrust instead of mechanical power, btw that rig you built is awesome! i had never heard of such a thing until now
@nyehnyi No, not reverse thrust, the surface it was sitting on was sloping slightly, the brick just stopped it rolling backwards before I started the engine. I had a brick at the front to stop it taking off too..! Smithy.
OK I must ask... Given the obvious astronomical cost of an awesome piece of machinery such as this...After all the testing and tuning.... How fast do you plan on taking that little guy? cause I know its capable of some big numbers man..
@MalliaCamilleri Um... not to put too fine a point on it... but... the afterburner IS the thrust augmentation, and it adds 30% more thrust to an already incredibly powerful powerplant. Right Smithy? Just thinking out loud here...
Hey Motorguy1, The whole car, ready to run with afterburner will put you back the best part of $6000AUD, The chassis was hand built by myself though, I don't know of any that can be bought. Cheers, Smithy.
Did you make the afterburner yourself? That thing is SICK!!! An people the engine needs to warm up before you can use the afterburner. For those of you complaining about when the flames come out. Cant wait to see it run on a track.
perhaps you should try using a Sanwa FHSS system, on that remote you can control the speed of the servo ( you are able to let the servo work slower ) and you can reduce the amount of travel ( a very good EPA control ) hope it helps you, greetings again Martijn
@vtwinmesa Not entirely true, about 60% or the air going through a true turbo-jet is used for cooling, the rest is used for thrust....hence the cooling air still has a nice amount of unburnt oxygen, this we can ignite with the use of the afterburner. If all the oxygen we already burnt in the engine, the A/B would not ignite at all. Cheers, Smithy.
Afterburner uses many times more fuel than the jet itself on full throttle. Now think of a F-15 engine, burning 215lbs per minute/engine on full dry throttle...and then think of it on full wet (afterburner)! That's like 1000lbs per minute...for one engine. I figure an F-15 with 22,000lbs of fuel will run out in 11 minutes at full burner, compared to 51 minutes at full dry thrust (which still isn't much...that's why they cruise at partial power.
That is awesome.... not just the fire show... but wactching those fuel lines jump and that tank getting lower and lower... a wonderful display!!!!!
That is the freaking COOLEST thing I've ever seen. Dam. That engine eats up fuel like water. Mad Props To You!!!
That is the sickest thing ever! Wicked awesome! I'd love to see this in an RC jet!
Thats a bloody good job you done on this mate, 100/100!!!!
Lots of time, money and patience!!
Cheers,
Smithy.
Cool to see the fuel line shutter when A.B. kicks in!
nice work!
peace
This thing is a beast. So cool.
Hi David,
I've always wanted to make one too. Yes there is a flame holder in the burner can, still needs some work to get it right though, at high rpms the flame is very inconsistent. I had to use a hot-streak to light the A/B as well. not easy to do on such a small engine.
wow nice craftsmanship
Dave,
The "hot-streak" is a small nozzle which introduces fuel into the combustion chamber in a fine jet, this momentarily shoots a small flame through the turbine and lights the fuel within the A/B. I tried the glow plug approach but it failed misserably.
Cheers,
Smithy.
i love this, what a beast!!
@knobby4 true, turbojets don't bypass air around the core, but they do direct some air further into the combustion can(s) to shape the flame. This is called primary, secondary and tertiary airflow, only the primary gets burn't which is about 60% if I remember correctly. Secondary and tertiary air doesn't get burn't, therefore it's oxygen rich, making afterburners possible in turbojets.
look how fast that fule goes i love it :)
Easily one of the best videos on UA-cam
Hey Chevy,
Yes, the A/B fuel tank is now a 1 litre saline bag which now sits between the frame rails, the engine fuel tank is the same but only 500mls. Doesn't last long at all..!!
Cheers,
Smithy.
I love how you can see the fuel being sucked out of the tank every time it hits.
@vtwinmesa true, there are differences between turbofan, tubojet, turboshaft and turboprop engines. Turbofan does bypass most of its air around the core, whereas turbojets takes the whole mass airflow through the core as there is no bypass, however, some air in all engines doesn't mix with the fuel, it is directed further back in the can to shape the flame into what is known as a toroidal vortex. this air is called primary, secondary and tertiary airflow. Only the primary air is burnt, secondary
Excellent A/B ignition ...........perfect :-)
great job!
That bottle of afterburner juice gets empty pretty quick! Very cool!
Magnificent!
Awesome job knobby4 ! I love watching rc jets at the flying field, this is a whole different level. How do you stop it , does it have brakes like a jet?
how cool is that!
You're quite right, it is fairly slow off the mark, but has plenty of top end speed, 183.56kmh so far, recorded at WSID drag strip just over a week ago.
Cheers,
Smithy.
@knobby4 hmmm yes, heard that before, but air at that temperture has very few oxygen, but certainly some left. when the a/b is on does it burn inside the a/b chamber too or just outside as seen in this video?
Hey Cyclops,
To be honest, I haven't had it flat out, I always run out of room first, plus when it is a long way away it can get difficult to control. Turbines don't have the throttle response of a piston engine and things take time to happen. I've had her up to a measured 143kmh but she's capable of a lot more I suspect, I just don't have the balls to do it yet!!
Cheers,
Smithy.
Thanks Champ, i'll keep you posted as to how she's going.
Cheers,
Smithy.
Hi PB, yes the A/B is custom made, took me many months to just get it to light let alone make any extra thrust, I get about 30% extra thrust out of it now.
Cheers,
Smithy.
i love how fast it eats the fuel every time he hit the after burner
Hey Mud,
Yes I have some cable operated brakes like the ones fitted to the Traxxas machines, am hooking up the cables today hopefully.
Cheers,
Smithy.
Hi Dude,
The afterburner or "re-heat" is used for thrust augmentation, in some cases it can add ~40% or more to the normal thrust output, in this case it is ~30%....but uses 150% more fuel, not really fuel efficient..!!!
Cheers,
Smithy.
Jet A-1 mixed with 5% Mobil Jet II oil for the engine and usually just straight Jet A for the A/B but here I am just using the same as I already had it pre-mixed.
Cheers,
Smithy.
a thing about afterburners few realize is that in a turbo fan engine there is a flow of fresh air supplied to the afterburner stage, but in a jet engine that is not possible. I spend a lot of time thinking about this and the only option I see is to build a ram air cone around the engine that would do the trick but only from a certain speed upwards , at zero speed not applicable
The engine itself runs on real jet fuel... Jet A-1 with 5% turbine oil (Mobil Jet-II) mixed in with the fuel. The bearings are lubed by this fuel and the lube flow is then burnt out the back, a total loss lube system.
I use the same fuel for the A/B system mainly because I have it already mixed, but straight Jet A-1 also works very well.
Cheers,
Smithy.
Ive built alot of models over the years, but ive never seen anything like that! Pretty damn cool! Did you build it yourself? How did you actually make a working afterburner? Ide like to see it in action.
Eyy, here come the recommended trains!
Hi Martijn,
You're quite right of course, I have radio which can vary the servo travels etc...the only problem is that just a tiny movement of the servo has a major effect on the turning of the car at high speed, under ~45kmh it's not bad at all, but get very "twitchy" at higher speeds....very scary indeed.
Cheers,
Smithy.
Hi Martijn,
The car is capable of well in excess of 160kmh, however it's very difficult to control at this speed, the steering is very direct and a lot of "expo" is dialed in to help, I'm still working on the steering to try and reduce the rate. The engine produces more than enough thrust to achieve this sort of speed, keeping it in a straight line it the hard part.
Cheers,
Smithy.
Im in the design stages of building my own RC Turbine. Can you tell me what brand Turbine you are using? I was looking at the Jet Cat P100. Do you have any recommendations on turbine selection? Any help would be greatly appreciated.
Thank you :)
My carport/garage floor has a bit of a slope to it and I didn't want the car rolling backwards.
Cheers,
Smithy.
thats supa kool, hope it runs hard when ya get it on the strip. Why did u place a chock behind wheel out of curiosity?
Oh man thats ace
@knobby4 the full size jet machines are the same way off the line they are slow but just look at the other end of the track, i figure this is because they are driven by thrust instead of mechanical power, btw that rig you built is awesome! i had never heard of such a thing until now
yowwww brada you are awesome
That is cool as hell. Can it make the big plume of smoke or steam or whatever like the real ones at the drag strip do?
Hey Blitz,
No, I'm using Jet A-1 with 5% Mobil Jet-II oil mixed in the fuel. It has a total loss lube system, hence the oil content.
Cheers,
Smithy.
i loved watching the fuel dwendle
that is cool,
were do you plan on putting the fuel tank? in the front of the car?
@stupidplants
No, it uses Jet-A1 with a little turbine oil mixed in to lube the pump. I do use propane to help start the engine though.
hi, nice afterburner. how much extra thrust do you get when on full reheat?
@bennett1608 yeah Afterburners suck fuel like crazy, but does provide and good amount of extra thrust.
woooow thats amazeing have you driven it yet? and if so how fast? thumbs up and subscribed
@nyehnyi
No, not reverse thrust, the surface it was sitting on was sloping slightly, the brick just stopped it rolling backwards before I started the engine. I had a brick at the front to stop it taking off too..!
Smithy.
@justforever96 BTW, JP-4 is about 6.84lbs/gallon...22,000lbs = 3,216gallons. 1,000lbs = 146.2gallons/minute/engine
Dude, don't just stop at making a car with an afterburning jet engine, I wanna see you install this thing on an RC plane. This thing is sick!
Yes, you're quite right, she is plenty thirsty, if I keep the A/B running it will empty the 1 Liter fuel supply in ~30secs..!!
Cheers,
Smithy.
Is there a kit afterburner out there and how can I go about getting that kit????
Dang, that thing drinks more than a sailor at a bar during happy hour:)
@xoio
At full rpm it gives ~30% extra thrust.
Cheers,
Smithy.
Holy Shit, you could win this race with this car!
that is amazing 2 thumbs up
what kind of speed would this car be able to run approx ?? impressive stuff mate, greetings from holland
Martijn
what type of tires and where can i get one. building a 100lbf pulse jet powered one
OK I must ask... Given the obvious astronomical cost of an awesome piece of machinery such as this...After all the testing and tuning.... How fast do you plan on taking that little guy? cause I know its capable of some big numbers man..
what purpose of the brick. are you worry for reverse thrust or what?
@knobby4 how does an afterburner work anyway?
@MalliaCamilleri Um... not to put too fine a point on it... but... the afterburner IS the thrust augmentation, and it adds 30% more thrust to an already incredibly powerful powerplant.
Right Smithy? Just thinking out loud here...
Does the AB give much extra thrust, or is it mostly for show?
Most certainly, just open up the A/B but don't ignite it, a big cloud of white smoke is the result..
Cheers,
Smithy.
i like watching the fuel go down every time you use a/b
Smithy,
Where did you get your AB?
or did you make it?
Now that's a barbeque!
im building a pulse jet rc car.. can you tell me what frame this is?
The engine can be bought, the afterburner is custom made though!!
Cheers,
Smithy.
Awesome. But as soon as the afterburner kicks in, watch the fuel in the ca going away :(.
@puggster what i was thinking some hellacious going out flow
wow omg r u serious holy crap amazing!! :DDDDDDDDDD
te mamasteeee esta con madre !!!!!!!!
Hey Motorguy1,
The whole car, ready to run with afterburner will put you back the best part of $6000AUD, The chassis was hand built by myself though, I don't know of any that can be bought.
Cheers,
Smithy.
No kidding on the fuel! What do you use?
where can you buy these??? and how much are they??
Can you make it drive forwards too?
Did you make the afterburner yourself? That thing is SICK!!! An people the engine needs to warm up before you can use the afterburner. For those of you complaining about when the flames come out. Cant wait to see it run on a track.
perhaps you should try using a Sanwa FHSS system, on that remote you can control the speed of the servo ( you are able to let the servo work slower ) and you can reduce the amount of travel ( a very good EPA control ) hope it helps you, greetings again
Martijn
that fuel tank reminds me of my car when I drive it everyday
I want one!
@vtwinmesa
Not entirely true, about 60% or the air going through a true turbo-jet is used for cooling, the rest is used for thrust....hence the cooling air still has a nice amount of unburnt oxygen, this we can ignite with the use of the afterburner. If all the oxygen we already burnt in the engine, the A/B would not ignite at all.
Cheers,
Smithy.
DEAR SANTA....
holy shit look at that feul~!
how much is a gallon of the fuel it runs off of????
Hahah I love how you see the fuel disappear :P
Holy cow, watch the fuel level in the bottle go down, lmao, nice!
Man that engine sucks the fuel. Awesom video!
Hey Krugtech,
Yes I have, but the A/B is a bit inconsistant at 100%, BTW I know of your turbine powered van, very cool indeed.
Cheers,
Smithy.
Afterburner uses many times more fuel than the jet itself on full throttle. Now think of a F-15 engine, burning 215lbs per minute/engine on full dry throttle...and then think of it on full wet (afterburner)! That's like 1000lbs per minute...for one engine. I figure an F-15 with 22,000lbs of fuel will run out in 11 minutes at full burner, compared to 51 minutes at full dry thrust (which still isn't much...that's why they cruise at partial power.
WOW, you can see the fuel level dropping....
Man that is sick (positive way)!!!
@Thercflyer96 yeah it drinks like a sponge!
Did u guys notice how fast the fuel in the jar goes down if the afterburners is used?
Hey Jetpower,
I get about 30% extra on a good day but the fuel consumption is horrific..!
Cheers,
Smithy.
and how much did it cost?