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rexjan(at)bigpond.com
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 Posted: Tue Jan 30, 2007 6:23 pm Post subject: Different tanks |
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Hi ! Bradley,
you wrote
The different size tanks are the primary reason I wanted to select each tank
individually. I'm curious though if I used both together, what would happen
when one goes empty? Would it suck a bubble though? Or just sit there, while
the other tank with fuel in it fed the header? I didn't know, so I put the
L-O-R valve in.
My thinking says if you fly wings level the two disimilar tanks will empty the same time due to head pressure. If one tank either the larger or the smaller has a higher head pressure that is where the fuel will feed from.
As for sucking air I agree strange things do happen but again if one tank is down to zero ie:- air then that should have no bearing stoping the other tank feeding as it is higher head pressure.
I think using that word suck creates a problem in ones mind. I'm no expert here but my understanding of fluid dynamics is you just don't use such terminology as it creates confusion and in fact there is no such thing as suck but only higher, equal and lower pressures. Look at it this way and your problem is non existant. Obviously the tank with fuel in it is the higher pressure. In any case what's stopping the higher tank feeding the lower tank ? Higher to lower pressure ! In this case your tanks empty the same time with your wings level.
I hope I'm not out of my depth here but I don't think you have a legitimate concern even if you don't keep your wings level.
Rex.
[quote][b]
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Beemer
Joined: 26 Aug 2006
Posts: 87
Location: Middle Georgia
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| Posted: Tue Jan 30, 2007 7:07 pm Post subject: Different tanks |
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You’re right, I shouldn’t have said “suck” fuel. Probably no issue, but I figured the valve was easy to plumb in, and I like the idea of being in control of it, and I have a little redundancy if one tank goes, or a cap gets left off or skewed. With the different sized tanks, I can control the weight imbalance to a certain extent. Haven’t needed to yet, but just in case. I just basically designed my system to know exactly what I have, and the ability to control it, or fix a possible problem by switching tanks. It’s not totally fool proof, but…
I do like the idea of you guys who can just use both at the same time, and the header stays full with no input. I may go that route at some point, just to not mess with it. But I’d like to have equal volume tanks on both sides.
Bradley
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Rex Shaw
Sent: Wednesday, January 31, 2007 3:51 PM
To: kitfox-list(at)matronics.com
Subject: Different tanks
Hi ! Bradley,
you wrote
The different size tanks are the primary reason I wanted to select each tank
individually. I'm curious though if I used both together, what would happen
when one goes empty? Would it suck a bubble though? Or just sit there, while
the other tank with fuel in it fed the header? I didn't know, so I put the
L-O-R valve in.
My thinking says if you fly wings level the two disimilar tanks will empty the same time due to head pressure. If one tank either the larger or the smaller has a higher head pressure that is where the fuel will feed from.
As for sucking air I agree strange things do happen but again if one tank is down to zero ie:- air then that should have no bearing stoping the other tank feeding as it is higher head pressure.
I think using that word suck creates a problem in ones mind. I'm no expert here but my understanding of fluid dynamics is you just don't use such terminology as it creates confusion and in fact there is no such thing as suck but only higher, equal and lower pressures. Look at it this way and your problem is non existant. Obviously the tank with fuel in it is the higher pressure. In any case what's stopping the higher tank feeding the lower tank ? Higher to lower pressure ! In this case your tanks empty the same time with your wings level.
I hope I'm not out of my depth here but I don't think you have a legitimate concern even if you don't keep your wings level.
Rex.
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01234
[quote][b]
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_________________
Beemer
KF2 (and now an M3!)
Suzuki G10 three-banger
Middle Georgia |
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