Zagzoo

My Feedback: (28)

Im installing the smoke system in my BD, the tail pipe is 22 1/2" long. I heard from different ppl, run the brass injector tubes between the 2 walls of the pipe, and other say to put the injectors before pipe. Running the injectors thru the pipe (preheating oil) better set up for good quality smoke? too far to spray into the exhaust?

thanks..

AFTERBURNER1

My Feedback: (80)

Stainless Steel stick needs to be used not brass... You really only need one stick leading to an exit point directly behind (center) the tailcone of the turbine...

KC36330

you need preheating on glow and gas engines, a turbine exhaust temp is more then hot enough to completely vaporize the smoke oil without preheating. inject just aft of the tail cone and just deep enough into the jet blast to get complete vaporization. if you inject too deep you get less smoke because it burns the oil rather then vaporizing it, too far out and you don't get full vaporization (you'll have droplets in the pipe) and as mentioned, one stick is plenty, I've used brass and it works, but the stainless is far superior, the brass will anneal from the heat and the blast will push/bend it out of the jet blast and it starts to droop down as well.

Jetpilot24

My Feedback: (21)

I have run a single piece of brass between the 2walls of the pipes on an F-86. The brass works fine but if you have a hot start it will melt the injector at the end of the tail pipe. With this set up I was able to get very good smoke. I do not like injecting it at the back of the turbine in side the tail pipe because I have seen others have a tailpipe fire with the oil.

Frank, let me know when your ready to fly it and we might havwe 2 maidens.


Joe L.

Zagzoo

My Feedback: (28)

It looks like on the 4th ot 5th, I have to go monday/tuesday to get the DTE light (5gal for $60, wooo hooo) and powermax. I get paid on wed to go buy a fire extinguisher. The BD should be all wired up tonight, have to wait till monday as well for more gas line for the main tanks to plumb in.

causeitflies

Hey guys,
Let me know when you're going. I may come up too.
Joe, what's the other maiden?

Jetpilot24

My Feedback: (21)

Mark

If its ready I have a Fei bao F-86.
I still have some pluming to do on her.

Joe

K-A

Hi, what size of tube is needed as smoker injector, diameter and length??

BRG K-Ã…

Wayne22

My Feedback: (2)

It is around 1/8" stainless steel - 3.17 mm. The diameter is not critical, nor is the length. What is critical is the shape of the flattened nozzle on the end. You can do it yourself, and there are a few posts on RCU explaining how.....or you can save yourself a lot of grief by buying a ready made one from Tamjets............

PaulD

My Feedback: (39)

I made some from 1/8 stainless and it was easy. Gave the tube end a squeeze with pliers just enough to flaten it a little, then stuck the tip of a #11 blade into the end of the tube. Squeeze again down on the blade (hard) and then pull the blade out. You should be left with a nice flattened oval shape that should give a fanned spray pattern. I put this onto my Reaction and get lots of smoke. Quality varies with the fluid itself.

I would tend to agree that I would want the nozzle after the pipe as if the fluid does pool in the pipe it will light on fire....

PaulD

i3dm

My Feedback: (51)

Why not use brass ? just curious, since it seems to work well in a few models ive seen.

KC36330

read the post directly below the one you quoted and it tells why brass isn't a good choice.

K-A

Hi brass tubing works fine no problems, I use a 3 mm tube that is flattend to an oval shape in the end using a pliar, and it works great.
I use a Jetcat P80 the injector is located in the centre 50mm behind the cone, the pressure to the oiltank is taken from the turbine via the propane tubing and I use a magnetic valve for controlling the smoke.

Very simple sollution but it works for me.

BRG K-A

i3dm

My Feedback: (51)

K-A, which solenoid do you use ?

K-A

Hi, I use a standard jetcat valve for propane/kerosine, and it is controlled via the ECU and the 3 stage switch on the radio, I now use the throttle trim for starting and shutting down the turbine.

The construction of this smoke system is very simple, it can beee seen in the jetcat manual page 37, www.jetcat.de

BRG K-A

i3dm

My Feedback: (51)

Yes i know it, i was just curious about the valve. thanks.

Zagzoo

My Feedback: (28)

or you can use a sylivian skywriter smoke system, that is what I use in mine. just a check valve before injetors.

AFTERBURNER1

My Feedback: (80)

I use old fuel pumps with a bec.... They will last a LONG time....