marc s

I have the pump and battery but no injector nozzle, so I need to make one - I would really appreciate some ideas as I have no clue what is required, only that the resulting 'smoke juice' is sprayed into the path of the tubine gasses in as fine a mist as possible.

Drawings, ideas, materials and positioning of injector are all needed.

Appreciate all your help in advance.............

marc

Wayne22

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The best way is to send $15 to Tam for one of his....

I tried to roll my own using all kinds of fancy designs. There is some precision required for the nozzle end, and I never got close enough to make anything but a huge mess......

The Tam's nozzles work well...very well!
http://www.youtube.com/watch?v=uh0BYd8H8_o

DelGatoGrande

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http://dreamworksrc.com/catalog/prod...roducts_id=862

CJ2002

Marc,

Ali's a Tams stockist...ask him.

Cheers,

Dick
England

marc s

Thats what I'll do then...

marc

Shaun Evans

Hi,

I've used 1/8" and 3/32" OD tubing (copper and stainless steel) with excellent results. I flattened the spray end with a vise-grip, using a piece of 1/64" flat brass stock as a spacer. The whole operation cost me about $0.99 and works every bit as good as any commercially-available ones I've seen. Good luck!

Rider-60

My Feedback: (17)

You can also use the tip of an x-acto blade to act as a spacer; works very well also.

Florent

marc s

Could you explain where to position the injectors in relation to the turbine exit.

marc.

DelGatoGrande

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after and in!


..search for smoke set up this forum...pleanty of photos

Shaun Evans

Hi,

On mine, the tube (I only use one) is positioned alongside the engine, held in place by the mount (JetCat) and the tube bends to follow the contour of the back of the can. The end of the tube is about 1/4" aft of the exhaust cone and about 1/16" away from the hot stream. The front of the tube is connected to the 4mm oil line with a piece of neoprene. Voila.

ghost_rider

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A picture of this setup would be invaluable.

CraigG

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Like this?

i3dm

My Feedback: (51)

Exactly what i did - on several jets ! works perfect !

Here are a few pics of Shaul's Gripen and my Jetmach, this works perfect on about 5 jets now, plenty of smoke with 1 tube !

ghost_rider

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Craig

Thanks for the picture. Your setup looks like what I’ve been using for many years that happens to be commercial version. I had wanted to see how Mr. Evans designed and mounted his home made version as I would like to employ such setup in my next project and save few $$. You can see my commercial setup in action in this video from 4 years ago: http://larksclub.homestead.com/jetvideosmall.wmv

AKB

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While you are on the topic. What do you use for the bending the stainless steel pipe to keep from kinking it, and you can't preheat the tubing to help in the bending or can you? Also it looks like the flattended outlets ends are vertical to the fuselage is this correct? I have the jetcat smoke system.

Sorry for hijacking the thread.

Alan

Wayne22

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Alan...just use your thumbs...a bit of care and you can make it follow the contour of your engine. As long as it is spraying directly into the core of the efflux, the orientation shouldn't matter that much....... BTW...put a shut off valve in between the pump and the ss nozzle. It makes a h3ll of a mess inside the jet when it spills out of the nozzle..It soaked into the ceramic blanket, servo leads...etc etc..... I got it totally stripped down to clean it off.......

rjbob

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Thread doesn't look hijacked to me. Any info related to the smoke injectors is going to be helpful.

AFTERBURNER1

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Terry smoke stick it the BEST!!!! HANDS DOWN.... Dual sticks do nothing but waste your super dri..

TAILHOOK-RCU

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Tam's system works great.

http://www.youtube.com/watch?v=CDH-BZ4gsa4

czech89

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I get inquiries on how to make these all the time so here is a brief description with photos of how I make mine. The key to getting good dense smoke is atomizing the fluid as soon as it comes out of the injector. A simple crimped slit at the end of the tube works OK, but much of the smoke fluid leaves the hot exhaust stream in liquid form without ever turning to smoke. This is particularly a problem in systems that do not run in an exhaust pipe ie. Boomerang, Kangaroo, etc.

My solution is for the smoke fluid stream to impinge on a sharp surface as it leaves the injector causing it to atomize. I use thick walled 1/8" K&S stainless tubing with good results. I have also used 3/16" but it is thicker, heavier, and harder to cut.

1. Use a Dremel with a thin cutoff wheel. Be sure to use safety glasses as the stainless is tough to cut, and I have had numerous
discs explode while cutting. (Photo 1)

2. Cut approximately a 1" slit in the tubing with the cutoff wheel. (Photo 2)

3. Cut away the top half of the tubing and discard. (Photo 3)

4. Flatten the remaining half and crimp a T-pin in the end of the tubing. The larger the turbine, the larger the volume of smoke fluid required, and the larger the crimped opening needs be. (Photo 4)

5. Bend the flattened end back on itself so the end points directly at the crimped opening. I then pump water through the tube and tweak the end unitl I get the best spray pattern possible. Sharpening all the edges with a file also seems to enhance the spray pattern. I position the injector opening in the center of the exhaust stream about 1.5" behind the tail cone. If placed too close the fluid can ignite during acceleration. (Photo 5)

Happy smoking!

Terry

sengle

Thanks Terry,

So does the 'T-pin' stay crimped in there, or is it just used for the initial spacing?
Cheers from New Zealand!