Smoke with YS 120's pressure system???  
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Smoke with YS 120's pressure system??? - 3/7/2002 3:37:58 AM   
Traxxas_Tech



Posts: 746
Joined: 1/7/2002
From: Plano, TX, USA
Status: offline 		I really want Smoke from my YS 120 NC, but dont want the weight of a TME system in my Ultimate.
Dave patrick's Aerobatic Book talks about making smoke by tapping into the engine's onboard tank pressure system. Has anyone tried this? What kind of results are you getting compared to the electric TME system?

Please share any thoughts

Thanks, Coulter

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Smoke with YS 120's pressure system??? - 3/7/2002 8:57:09 AM   
acroeric


 

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Joined: 3/6/2002
Status: offline 		You can do it but the drawback is loss of pressure when your smoke tank runs dry. It is really easy in that you plumb another check valve to the smove tank with an el-cheapo valve to control the smoke oil flow. My suggestion- don't waste your time- the glow engines do not smoke that well plus it adds alot of weight-

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Cool. - 3/7/2002 10:19:06 AM   
Traxxas_Tech



Posts: 746
Joined: 1/7/2002
From: Plano, TX, USA
Status: offline 		I thought the only weight you add is the weight of the tubing, valve, micro servo and extra tank? Even thats much less than the TME system. As for smoke with glow engines, I'm using a Slimline smoke muffler w/preheat, I've seen good smoke made with that setup.
I'm just not sure about using YS's pressure system to pressurize the smoke tank? Any one else out there try it?

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Smoke with YS 120's pressure system??? - 3/7/2002 5:23:15 PM   
acroeric


 

Posts: 5
Joined: 3/6/2002
Status: offline 		Yes, it is the lightest smoke setup but don't forget about the 10 ounces or so of smoke oil that may or may not be at the CG. Ready to fly it will add about a pound. I had a setup like this on my CG Ultimate with a YS 1.20 and ended up removing it. It worked fine but I had to time my smoke supply because when it was gone the pressurization system of the YS would not keep up with the empty tank's venting of air and the engine would quit if I did not close the smoke valve quick enough. Heck- it doesn't really cost anything to try it-

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Smoke with YS 120's pressure system??? - 3/7/2002 5:32:21 PM   
Elwood



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Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		I have not tried it, but when the smoke tank runs dry, there will be a clear exit for the smoke tank pressure through the line to the muffler. Having this easy way out for pressure, would your fuel tank have enough pressure? Or is this where the mocro servo and valve comes into play? Would the muffler pressure overcome the pressure in the smoke tank?

I do not have any experience with smoke systems, just asking a few questions.

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I get it! - 3/7/2002 8:21:31 PM   
Traxxas_Tech



Posts: 746
Joined: 1/7/2002
From: Plano, TX, USA
Status: offline 		Ok, now I understand the pressure idea. The engine is pressurizing both fue, and smoke tank. The smoke tank leads to an open hole in the muffler. When the smoke oil is gone, the pressure goes right out of the system via the smoke hole in the muffler, thus removing any pressure from the tank, and killing engine.(not good). Heres a thought! If we install a check valve right after the tee for the smoke line, the engine would run for about 8 seconds with whatever pressure was left in the fuel tank, (meanwhile were venting pressure through the muffler). That will give us enough time to shut off the smoke valve. Does this make sense to anyone other than myself? Thanks

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Smoke with YS 120's pressure system??? - 3/7/2002 9:37:19 PM   
Elwood



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Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		I hope you don't run out of smoke during a hover with your rudder resting on the ground!

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Re: I get it! - 3/7/2002 9:51:39 PM   
can773



Posts: 1652
Joined: 1/25/2002
From: Calgary, AB, CANADA
Status: online 		[QUOTE]Originally posted by Coulter_Dean
Ok, now I understand the pressure idea. The engine is pressurizing both fue, and smoke tank. The smoke tank leads to an open hole in the muffler. When the smoke oil is gone, the pressure goes right out of the system via the smoke hole in the muffler, thus removing any pressure from the tank, and killing engine.(not good). Heres a thought! If we install a check valve right after the tee for the smoke line, the engine would run for about 8 seconds with whatever pressure was left in the fuel tank, (meanwhile were venting pressure through the muffler). That will give us enough time to shut off the smoke valve. Does this make sense to anyone other than myself? Thanks [/QUOTE]

Ever pulled the pressure line on a YS?? Well then you know that the INSTANT the tank is vented the pressure is gone. A YS is not pumping 1500 scfm gas it wont have enough to pressure up both tanks while the smoke is on, once you open that smoke valve your pressure will be gone. I wouldnt be trying it


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thats right... - 3/7/2002 11:10:04 PM   
Traxxas_Tech



Posts: 746
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From: Plano, TX, USA
Status: offline 		Thats right, the pressure is gone instantly when you pull the plug, BUT, IF you put a check valve (which is a one way valve), right before the fuel tank, but after the smoke line, you can unplug and depressurize the smoke tank all you want, but the fuel tank will keep its pressure untill the engine uses it all up, or untill I shut off the smoke. Make sense?

The picture shows a "*" as a new check valve Thats where I'd put it.

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Smoke with YS 120's pressure system??? - 3/8/2002 2:01:59 AM   
can773



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From: Calgary, AB, CANADA
Status: online 		A picture is worth a thousand words

It could work, thing you would have to figure is how long will the engine run on just the pressure that is in the tank, plus once all the tanks have been reduced in pressure you may have some lag to get pressure built up in all of them again. Some detailed ground testing is on your agenda soon I think


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Smoke with YS 120's pressure system??? - 3/8/2002 4:15:40 AM   
Elwood



Posts: 1512
Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		Good luck! You might need it...

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sheez... - 3/8/2002 10:10:02 AM   
Traxxas_Tech



Posts: 746
Joined: 1/7/2002
From: Plano, TX, USA
Status: offline 		This is so discouraging. I wish there was a better way. I guess I'll start testing away...

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Smoke with YS 120's pressure system??? - 3/8/2002 6:45:11 PM   
Elwood



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Joined: 12/11/2001
From: Wayne, NJ,
Status: offline 		Keep us informed. Sounds cool.

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Hopper tank - 3/8/2002 9:26:39 PM   
elmshoot


 

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Joined: 12/27/2001
From: Nashville, IN,
Status: offline 		Dean,
This is the drawing I was looking for, I had seen it some were before. Now I undersatand that you would also recomend adding a 4th check valve on the overflow on the fuel tank? I really don't see the purpose of the hopper tank. Are the YS check valves smoke oil proof?
I plan on using this setup on a YS .91 in a GEE BEE R2. I am going to use the Hays 16 oz fuel tanks.
Sparky

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Smoke with YS 120's pressure system??? - 3/8/2002 11:49:52 PM   
Traxxas_Tech



Posts: 746
Joined: 1/7/2002
From: Plano, TX, USA
Status: offline 		The YS check valves are smoke oil proof to the best of my knowledge, the plastic disc inside is pretty tough.

I dont see why the hopper tank is needed, Supposedly to collect excess oil and fuel that will accumulate in the pressure line. When I'm testing I will see how much excess really accumulates in that tank. If nothing, I will omit it from future any YS smoking plans. I'll take some pics and post them while testing.

Also, the hobby shop is out of YS check valves. But at $8 a piece x 4, that will set me back a bit. I'll need to find some before I can test.
Till later Coulter

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