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Author Topic: Afterburner for RC  (Read 1837 times)

Offline Sol75

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Afterburner for RC
« on: March 23, 2009, 10:47:26 AM »
Hey guys,
I have an R/C Byron F-16, with a Jetcat P-80 turbine.  I have drawn out plans for a functional afterburner to be used on it.  (mainly for scale purposes rather than true performance boost, but that could be fun too lol).  My question is, do any of you know of, or can, build this contraption for me?  I did all the drawings in AutoCad.  I know nothing about metalworking, so, I appeal to those of you who are skilled in such things to get in touch with me!  (and yes, this IS an afterburner, not a lighting setup that mimics one).  Should put a nice cone of flame out the rear of the jet, and add some power as well.

Who knows,
If it is succesful, there might be a future in selling these things to other modelers.... If that happens, I would be glad to offer whoever made it first right of refusal to make more for other people.

Sol
« Last Edit: March 23, 2009, 10:50:25 AM by Sol75 »
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Offline Skuzzy

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Re: Afterburner for RC
« Reply #1 on: March 23, 2009, 11:14:45 AM »
Did you also plan for the added fresh airflow into the exhaust stream when afterburner goes online?
How much pressure  is the pump delivering to the afterburner?
What fuel do you plan on using for the afterburner?
Are you adding the exhaust port/cone for the afterburner to the exterior, or do you plan on fitting it internally to the tail?


If I had the bandwidth, it would be a fun project.
« Last Edit: March 23, 2009, 11:17:57 AM by Skuzzy »
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Offline TilDeath

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Re: Afterburner for RC
« Reply #2 on: March 23, 2009, 12:24:14 PM »
SHawk owns a machine shop, you may want to contact him and see if he is interested.

TD
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Offline Getback

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Re: Afterburner for RC
« Reply #3 on: March 23, 2009, 02:16:35 PM »
I see an explosion coming.
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Offline SFRT - Frenchy

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Re: Afterburner for RC
« Reply #4 on: March 23, 2009, 02:37:05 PM »
Just get a bypass air supply and throw a fuel line back there. Make sure u record ur first flight PLS  :devil
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Offline Bosco123

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Re: Afterburner for RC
« Reply #5 on: March 23, 2009, 03:24:42 PM »
Oh man that looks pretty tough. I wouldn't know but if you go to RCU, you might get an answer.
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Offline Sol75

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Re: Afterburner for RC
« Reply #6 on: March 23, 2009, 03:44:16 PM »
Skuzzy:
Quote from: Skuzzy on March 23, 2009, 11:14:45 AM
Did you also plan for the added fresh airflow into the exhaust stream when afterburner goes online?
Yes, I did, I drew plans for a new tailcone that will allow scoops to open ahead of the spray nozzles for the afterburner, with ignition of the afterburner, providing a source of fresh air.  Scale? no, but at speed and altitude they should be quite unobtrusive.  functional? not really known, but should be. 
How much pressure  is the pump delivering to the afterburner?
Unknown yet.  This will have to be done via trial and error, if done solely by myself.  I am a network engineer, not aerospace engineer :)  this is a hobby!  But, this should be reasonably simple to try different values until I obtain the ideal situation.
What fuel do you plan on using for the afterburner?
The same thing the turbine runs on, Jet A, or Kerosene with oil additives.
Are you adding the exhaust port/cone for the afterburner to the exterior, or do you plan on fitting it internally to the tail?
I am intending to add it to the interior of the tail.  I also have a.. much less detailed and MUCH less expensive aircraft which i got from a friend when i first got into turbines.. basically a traditional balsa built up airframe, but designed as a
"turbine trainer".  Will likely use that as my testbed jsut in case something goes wrong.  Don't want to destroy the F-16, put WAY too much time into it.


If anyone has ideas on anyting for this, I would be GLAD to hear from you.


Sol
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Offline Skuzzy

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Re: Afterburner for RC
« Reply #7 on: March 23, 2009, 04:11:15 PM »
I have a CNC rig, drill press and CNC lathe.  Just wish I had the bandwidth for this.

Putting the cone internally is going to be a challenge, due to heat.  Also, you need to cone to have a slight bell at the intake edge (from the exhaust of the turbine) to prevent shock wave feedback up the stream.  I assume the profile of the cone's internal shape is parabolic?

How long is the cone from the onset of fuel introduction?  I can run some calcs on the parabolic shape based on kerosene fuel.
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Offline mbailey

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Re: Afterburner for RC
« Reply #8 on: March 23, 2009, 04:33:08 PM »
Quote from: Getback on March 23, 2009, 02:16:35 PM
I see an explosion coming.

Now thats just funny   :rofl
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Offline Wolfala

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Re: Afterburner for RC
« Reply #9 on: March 23, 2009, 04:56:07 PM »
Would definitely get Shawk involved. I've been to his shop and he can program the machines to build it up for ya in 3d if you got the CAD drawings and dimensions worked out.

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Offline FiLtH

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Re: Afterburner for RC
« Reply #10 on: March 24, 2009, 09:08:08 AM »
   Hehe..wow you guys dont mess around. If it were me Id duct tape a torch to her and let her rip!


   Arent afterburners super intricate? I cant imagine trying to machine the parts involved.
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Offline Nwbie

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Re: Afterburner for RC
« Reply #11 on: March 24, 2009, 09:35:41 AM »
Sounds like a -Hey watch this -- moment in the making

They always have interesting outcomes

:)
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Offline Sol75

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Re: Afterburner for RC
« Reply #12 on: March 24, 2009, 10:58:32 AM »
Which is precisely why im not just stickin this thing on a plane and letting it rip.  Why im posting here, seeking the advice of a freind of mine who is an aeronautic engineer that works for General Electric, etc etc.  As for your question abt that cone Skuzzy, as son as I hear back from said friend, I will let you know the specifics on it :)

Sol
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Offline Bodhi

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Re: Afterburner for RC
« Reply #13 on: March 24, 2009, 01:15:15 PM »
sol, I'll take a look at it, but I likely think you will have to have a tail cone extruded or pressed.  I might be able to find some things around here to use, but I am not sure.  Send me a PM and you can send me your plans and we can go from there if you want.
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Offline whels

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Re: Afterburner for RC
« Reply #14 on: March 24, 2009, 03:32:33 PM »
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