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dpfisher(at)scottsbluff.n
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 Posted: Thu Sep 18, 2008 8:21 pm Post subject: 701 vent line |
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Curt wrote:
| Quote: | Is there a way to route that
line between the tanks without any dips or is there a way to keep fuel out?
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Hi Curt and list,
I'm still building so I can't swear it will work but I plan to vent my
tanks from the top of each tank to forward facing vents under the wings
with a cross vent just inside the lower wing skin which goes straight
across through the top of the cabin to the other under wing vent - no low
spots. (Is this how you did it, Ben?) If a little fuel happens to get in
the cross vent line it should be purged out the under wing vent having the
lowest pressure. I expect that there will be a little pressure
differential between vents due to prop rotation and the way the airflow
swirls around the fuselage. I hope the cross vent will equalize this
pressure difference so the tanks will see equal pressure . ( vented fuel
caps see different pressures for the same reason, mine are non
vented). I'm also putting individual cut off valves on each tank in case
they don't feed evenly.
Thanks for the interesting thread,
Dave Fisher, Perennial scrap builder, 701 with A-80-8 Continental
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Curt.Thompson(at)verizon.
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| Posted: Thu Sep 18, 2008 8:57 pm Post subject: 701 vent line |
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If you have a low spot and it gets fuel sloshed into it, this is what I
think will happen. Let's say the tube bows down for 6 inches and then back
up to the other tank. Now let's say that the tube is completely full of
fuel. As you blow air into one side, the air pressure barely starts to
build, a little fuel will be forced out of the tube. If you apply just a
little pressure (say 1 inch fuel pressure) and stop then you will force the
air down the tube for about 1 inch of elevation and the level will stop - an
equal amount of fuel will be displaced and dribble out the other side. If
you blow in 2 inches of pressure and stop, then the fuel level will drop to
2 inches and stop - more fuel will dribble out. Eventually, when you blow
in 6 inches of pressure, the air in the tube will start to bubble out the
other side. The air will just bubble up through the tube that is half full
of fuel. No more fuel will dribble out of the tube. But you will have to
maintain 6 inches of head pressure to keep the fuel forced up the other side
of the tube. If you release the pressure, the fuel just settles back down
to the bottom of the tube. To get more air to vent from one tank to the
other you are going to have to apply 6 inches of pressure.
Am I thinking about this wrong?
Curt
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