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Engine basics => Engine set up tips => Topic started by: Dwayne on June 14, 2015, 06:50:37 PM
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Here you go, for everyone, I tried to post a pic in a PM but it wouldn't let me, so I'm posting it here. ;D
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Hi Dwayne,
Do you just have two tubes coming out of the tank? I understand the pressure. Pressure is not always used. However, if pressure is not used, then the overflow gets capped off, always, if I understand it.
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Hi Dwayne,
Do you just have two tubes coming out of the tank? I understand the pressure. Pressure is not always used. However, if pressure is not used, then the overflow gets capped off, always, if I understand it.
Yes just two tubes, one goes to the clunk the other is bent up for over flow. On a uniflow tank where you have three tubes yes you would plug the overflow but on this setup the pressure line goes to the overflow, if you are not running pressure leave the overflow open. There are two ways to do this, you can either leave it open as is or I have seen some use a piece of fuel tubing and attach it pointing forward so that it gets some pressure but not as much as if you were running it off the pipe. I'm not sure and maybe someone here can correct me if I'm wrong, but I'm thinking my setup works so well because I'm running the pressure from the header and not the pipe, I think the pressure coming off the back of the pipe is a lot greater then coming off the header. Can anyone elaborate please?
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Hi Dwayne,
Thanks for the explanation. I think I've got it all figured out. The pressure is always capped or connected to pressure, one or the other. If there is a third fill tube, I am thinking that it can be capped or not capped. Today, for the first time, I used a clunk tank which I plumbed with three tubes for a Doodle Streak. Several times I flew with both the overflow and the fill tube capped. Several times, I only had the overflow capped. Performance was the same.
However, it really went rich when it got in the air (a Fox 35 with a Randy Smith nva). Finally, on the third and fourth flights, with needle turned in quite a bit with a fast 2 cycle at takeoff, it ran fairly good. It would slow in the air but did the 4-2-4 nicely for maneuvers. This tank a cheap Chinese clunk tank which came from the Tutor II. Only problem, can't see the tubes inside so I'm guessing about the overflow. I think I'm getting this figured out.
Notice that the capped off tube is overflow, the one not capped is fill, and of course the clunk is attached to the motor.
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Here is a Hayes Tank, side mounted on a Trixie. I haven't used it there yet. However, I had it mounted on the Flite Streak (now Doodle Streak - elongated fuse). I had it mounted in-board with pressure to a Fox 35. Best run I have ever had.
It's coming back to me. With these, the top nipple is pressure. The middle one I used for "fill", and of course the bottom one goes to the motor and is connected to the clunk. All my setups are influenced by this tank. I think that the fill line was also capped off.
I think I'm coming out of the fog.
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I did some research,
Magnum Tank illustration by Brodak.
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Here are several Brodak tanks illustrated:
I found this on a new - all tubes forward - tank. Uniflow