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Engine basics => Engine set up tips => Topic started by: Walter Hicks on August 29, 2015, 04:48:59 PM
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I need a 7 oz tank and this is the only one that will fit in my tank compartment. My question is how can I determine the pickup location
on this type of tank it needs to be lower than the center to the tank about where the seamless is stamped in the tank(http://i82.photobucket.com/albums/j262/kickercoach12/20150829_151215.jpg) (http://s82.photobucket.com/user/kickercoach12/media/20150829_151215.jpg.html)
(http://i82.photobucket.com/albums/j262/kickercoach12/20150829_151220.jpg) (http://s82.photobucket.com/user/kickercoach12/media/20150829_151220.jpg.html)
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Pickup or vent? I place the pickup tube so that the clunk will reach both outboard rear corners of the tank if I can, or so it gets equally close if I can't. That usually requires some coaching.
Post a picture of the tank in the plane?
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You can see the front of the tank in the plane as the tank is enclosed in a box
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I need a 7 oz tank and this is the only one that will fit in my tank compartment. My question is how can I determine the pickup location
on this type of tank it needs to be lower than the center to the tank about where the seamless is stamped
I don't really understand the question, but...
The pickup just moves around under acceleration, so the average pickup location is the center of the tank, and on suction, that's how it operates in terms of vertical location. If you can't move the tank, make it a uniflow with a rigid vent, and then rotate it up or down by twisting it in the stopper to adjust the run.
Brett
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Brett Thanks for the reply. Let rephrase the question. I have used clunk tanks with the tubes out the front of the tank I would line up
the pickup with the NV and rotate the Uniflow to adjust run. This has the tubes out of the tank at a 45 degree angle so I was asking if this was different . I think I have my answer I will post a picture of how I set it up.:
(http://i82.photobucket.com/albums/j262/kickercoach12/20150829_181203.jpg) (http://s82.photobucket.com/user/kickercoach12/media/20150829_181203.jpg.html)
(http://i82.photobucket.com/albums/j262/kickercoach12/20150829_181104.jpg) (http://s82.photobucket.com/user/kickercoach12/media/20150829_181104.jpg.html)
(http://i82.photobucket.com/albums/j262/kickercoach12/20150829_181056.jpg) (http://s82.photobucket.com/user/kickercoach12/media/20150829_181056.jpg.html)
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Brett please see my previous post with three added pictures. After research I think that the solution was to bend the pickup tube parallel to the top and bottom of the tank , I set this up with stationary unflow tube which i routed to the inside of the tank. Please take a look
and verify if this is what you are saying. Thanks so much for your help. I have a new K77 engine ( PA 75 clone from Kaz) and it needs 7oz + fuel.
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If that's your uniflow vent going into the dimple in the "top" of the tank then it's going to uncover earlier in the flight than if it were in the back of the tank -- but the general arrangement looks good to me.
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The uniflo vent is to the inside of the tank the overflow is in the bubble (top of tank)
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That bent into the bubble yank is the tank everyone from Texas uses and was the tank I used with the Saito. Everyone uses pressure with that tank. I believe Kaz advises pressure with his motor. So I would try what you have. You want the clunk about 3/16 from the rear. The floppier the tubing the better
Sent from my LG-E980 using Tapatalk
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The uniflo vent is to the inside of the tank the overflow is in the bubble (top of tank)
Then you fly clockwise. Or that's not a uniflow tube. Or you're going to find your tank acting strangely when you go to use it. Because with the location of the overflow and the pickup, that middle picture looks like what I'd want to see from the inside of the circle -- except that your "uniflow" is to the inside.
Now, if you just want a vent tank, no uniflow, then what you have should work fine.
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The uniflo vent is to the inside of the tank the overflow is in the bubble (top of tank)
I am having a bit of trouble seeing what you are doing, but as noted, the uniflow vent has to be to the outboard side of the circle, up against the outboard wall of the tank. Which way does the tank fit in the airplane, with the tubes aimed up or down?
Brett
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Tank sits in plane with tubes in the tank pointing down. as in picture #2 , bubble on top which is the overflow. pickup to the outside of plane uniflow tube to inside of plane as in picture #2. So I have the uniflow tube pointing the wrong way If I understand you it should be to the outside of the plane same as pickup tube?
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Tank sits in plane with tubes in the tank pointing down. as in picture #2 , bubble on top which is the overflow. pickup to the outside of plane uniflow tube to inside of plane as in picture #2. So I have the uniflow tube pointing the wrong way If I understand you it should be to the outside of the plane same as pickup tube?
Yes.
Brett
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Tank sits in plane with tubes in the tank pointing down. as in picture #2 , bubble on top which is the overflow. pickup to the outside of plane uniflow tube to inside of plane as in picture #2. So I have the uniflow tube pointing the wrong way If I understand you it should be to the outside of the plane same as pickup tube?
Yes. You want the uniflow tube to be covered in fuel for as much of the flight as possible -- that's what makes it a uniflow vent, and not just a plain ol' ordinary vent.
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Brett thank you for your time and answering my question
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Brett thank you for your time and answering my question
You are quite welcome. I am interested in how the new engine runs. Kaz definitely knows what he is doing.
Brett
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Thank you again Brett, I installed the tank last night and flew the plane today with it . I got it pretty close. .2 second faster inverted.
I may move the uniflow a very small amount but have to take the tank out to do that .