azuz

hello gang

I have been facing problems with my JETCAT SMoke SYSTEM
everything is arrranged in order.......and the fluid is diesel ...ATF 50;50 but then the smoke is like a 100cc prop engine........not so thick.............just like squirts.........at time only no smoke at all.........what could it bee. ??

hellp me someone......


azuz

azuz

another pic

Terry Holston

My Feedback: (1)

Try mixing some ATF (Automatic Transmission Fluid with the Diesel Oil. But the best is to get some smoke fluid such as
"Bennetts Best" Smoke Fluid. Most hobby shops will carry it or order it for you.

bvmjethead

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Terry,

He said in his post he's using a 50/50 mix of ATF and diesel. Plus he's in the United Arab Emerates, I wonder if Bennett's will ship there????

Scott

Ehab

My Feedback: (44)

Hey Aziz;

Assuming all the setup is in order, Try good smoke fluid not diesel and ATF. I tried the diesel/ATF route and got the same results you got, but then I switched to dry smoke fluid and got much better results.

Now, the way you plumb the tubing that dispenses the smoke fluid makes a HUGE difference in the quality of smoke. I normally run a brass tubing around the exhaust nozzle of the turbine. I then flatten the end of the brass tubing closed, then I use an exacto knife #11 to open up the end the smallest amount. Now bend this end so that it is about 1/2" away from the end of the turbine nozzle. Run the Turbine at 1/2 throttle and use long needle nose plier to bend the end of the brass tube and fine tune the smoke thickness. Point the brass tube towards the rear of the exhaust flow not inside it or you'll loose fluid pressure.

While flying at full power, the smoke density will decrease. At idle it should be very thick!!!! Try it and let me know, or if you want you can call me, send me a PM for my Cell number...
Good luck, Remember you owe us Americans a visit to Dubai

azuz

Ehab

Thanks for the post.. I doubt that we can get the dry smoke fluid available here as a pack. But i am sure i can arrange the chemicals if you can list it from the ingredients section on the dry smoke fluid can. !? Another favor would be if u can post a close up picture of the brass tubing.......I am posting the one i have at the moment.

In this the tube was right in the middle......which i feel is wrong and the tube was cut diagnoally facing towards the turbine. Now its cut in such a way that the mouth is facing away from the turbinge. What you just said in ur post would require me to cut it flat.......horizontal and the tube's mouth should be at what angle ?

cheers
azuz

Gordon Mc

My Feedback: (11)

Hi Azuz,

I will try to remember to take a pic to post tonight...

What Ehab was trying to tell you to do, is to squash the end of the brass tube so that it is completely flat, then use an Xacto blade to just open it up the tiniest amount possible.

Consider this - take a garden hosepipe that has just the rubber / plastic pipe at one end (not a metal connector). Now turn the water on and watch how it comes out at the end - in a solid stream, right ? Now squeeze the end of the hosepipe flat, between your thumb and forefinger and watch how the water comes out now - it fans out in a fairly fine spray. That's pretty much what you are looking for with the smoke fluid coming out behind the engine - get it into a finely atomised spray rather than a solid stream.

Regs,
Gordon

azuz

Gordon....

I think you have hit the nail right on the HEAD. Let me check this and have a go at it. I shall post once i experiment.

mick15

azuz here's my two penyworth your pipe is in the coolest part of the exhaust the spray should be from outside the jetstream across it
I use just straight diesel for excellent results
M

bvmjethead

My Feedback: (10)

Azuz,

It looks like you are familiar with smoke in gas planes, just like them, more smoke will be made if the liquid you're burning is vaporized or atomized as much as possible before or as it enters the hot exhaust of the turbine. Same principal. That was the reason for saying the brass tube needs to be flattened at the end. I'm pretty sure the BVM website has tips including pictures of the smoke setup on turbines. Based on what I saw there it does look like your brass tube is in the wrong position. You might check there.

Scott

mick15

Sorry wrong pic

Ehab

My Feedback: (44)

Azuz;

your brass tube should be hugging the turbine exhaust pipe in a full circle, then it should point out towards the rear at the edge of the nozzle, Not toward the center. Keep moving the FLATTENED tip in and out of the nozzle area till you get popping or even ignition then back off from there to achieve best smoke. Do this at 1/2 throttle!!!

BTW, Happy Ramadan!!!

Kevin_W

My Feedback: (1)

There are some good pics of a P-120 with a smoke system on Tam's page:
http://www.tamjets.com/id55.htm

azuz

Thanks guys.........

I pinched the nozzle tonight and we had a test on the jet again........same results...........we using 95% diesel and 5% ATF other than the 50:50 stated earlier sorry for the mistake.

Btw just called tamjet today to order both the smoke systems that he has wiht some other stuff

Gonna try to do some more mods.....may b i didnt picnh it tight enough.........anyone post the close up pictures or let me know where ican find close up pics ? so that i can detec the difference in the set up. I have a P 120 on a ROO.

Regards
Azuz

lov2flyrc

My Feedback: (24)

Dont know if this will help...off BV's site

Todd

MikeC-RCU

Hi Azuz,

We have been using smoke systems with great success for several years (long before many of the other guys on here), and have quite a different set-up.

After much experimenting I can assure you (in Europe) everyone uses BIO-diesel, FAR better than normal diesel and much cheaper !
This is Biological diesel, made from rape-seed oil, smells like cooking oil (french-fries!). Using cooking oil from the local supermarket (sunflower or similar) also works quite well. The set-up is explained, and shown in photos with dimensions on the 'DOWNLOAD' page, almost the bottom blue button on the left side of our website (www.amtjets.com).

Unlike one other person said in the thread, we get MORE smoke with higher throttle settings, although this is because we tap pressure off the turbine for our systems, and therefore need no extra pump/battery or air tank etc. Both ways can work though!

You absolutely do NOT need to preheat by wrapping the pipe around the turbine nozzle for good vapourisation. The important thing is a good flow. All tubing, connectors etc should be aprox 3mm I.D.

As a rough idea of consumption for REALLY good smoke, we get about 1.5 minutes at full throttle with 750ml of bio-diesel. The smoke is so dense that if I use it on take-off on a stillish day, you have to be careful that you can see the plane on the next circuit of over the field !!! I've nearly 'lost' my HS like this on a couple of occasions....

Wishing you success,
Mike C

mick15

Mikes right you do not have to pre-heat the fluid you just need lots of it. I use a turbine pump to deliver ordinary pump diesel through a 4mm pipe with the end flattened to create a fan spray.
My system uses 2 liters in 5 - 6 minutes depending on throttle.
Looking at you pics I don't think you are delivering enough fluid
M

I-NAV

My Feedback: (3)

Now if we can find a way to make the smoke black. Most of the old jets trailed plumes of black smoke. The F-104 and early F-4s looked like they had a burning tire in the tail pipe.

mick15

Put a burning tyre in the tailpipe then!!

azuz

sadly....

My smoke system still aint working..............Will chop off the nozzle and try again............i guess the openining is too big.........anyone got close up pics of the nozzle on one of their fine working systems

I-NAV

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What's a tyre?

bkf

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bkf

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bkf

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bkf

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The tip of a #11 blade only goes in 1/64"

ie. small and tite