[rebel-builders] Re: Fuel Tank venting
Posted: Sun Feb 19, 2012 4:37 pm
Ken,
Where did you put your header tank. It's just a gathering place for fuel
before it goes into the engine, right?
Original Message:
-----------------
From: Jim Cole jcole@rangroup.com
Date: Sun, 20 Apr 2008 14:56:05 -0400
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Re: Fuel Tank venting
I have a "J" - tube that I built into both caps and it has worked great so
far (touch wood). I've been thinking a lot about installing a small header
tank the same as Ken and that another friend of mine has on his Kitfox.
I did have a hiccup in the engine one day when I was doing steep turns, when
I had less than a 1/4 tank in the right wing tank.
A header tank make sense to me now.
I also happened to be at Found Aircraft in Parry Sound yesterday and one of
the things I took pictures of was the fuel tank vents that they have on the
Bush Hawk. They are hoses cut on an angle protruding from the bottom of the
wing, designed to catch the wind. I posted a couple of pictures under Rebel
Fuel systems - 212.
I unfortunately uploaded a large file 2mb before I realized I had not
grabbed the low rez version - so have an eye - the 2mb version is the same
as one of the other two low rez shots that I up loaded.
I watched the new Found Expedition (trike gear) do some test flying -
they're still working towards their certification. More like a Cadillac than
a bush plane but nicely finished.
Cheers
Jim Rebel 333
On 4/19/2008 2:05 PM, "Ron Shannon" <rshannon@cruzcom.com> wrote:
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Where did you put your header tank. It's just a gathering place for fuel
before it goes into the engine, right?
Original Message:
-----------------
From: Jim Cole jcole@rangroup.com
Date: Sun, 20 Apr 2008 14:56:05 -0400
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Re: Fuel Tank venting
I have a "J" - tube that I built into both caps and it has worked great so
far (touch wood). I've been thinking a lot about installing a small header
tank the same as Ken and that another friend of mine has on his Kitfox.
I did have a hiccup in the engine one day when I was doing steep turns, when
I had less than a 1/4 tank in the right wing tank.
A header tank make sense to me now.
I also happened to be at Found Aircraft in Parry Sound yesterday and one of
the things I took pictures of was the fuel tank vents that they have on the
Bush Hawk. They are hoses cut on an angle protruding from the bottom of the
wing, designed to catch the wind. I posted a couple of pictures under Rebel
Fuel systems - 212.
I unfortunately uploaded a large file 2mb before I realized I had not
grabbed the low rez version - so have an eye - the 2mb version is the same
as one of the other two low rez shots that I up loaded.
I watched the new Found Expedition (trike gear) do some test flying -
they're still working towards their certification. More like a Cadillac than
a bush plane but nicely finished.
Cheers
Jim Rebel 333
On 4/19/2008 2:05 PM, "Ron Shannon" <rshannon@cruzcom.com> wrote:
equalizeThe upper forward hole is for the cross vent, which is necessary to
ruinpressure in the tanks, such as if one external vent (see below) is plugged
by bugs, for example. Imagine what happens if one tank's external vent is
plugged and there's no cross vent. The tank develops negative pressure --
and the fuel stops flowing down. That may result in fuel starvation and
theyour day -- whether you inline valves for each tank, or just one valve at
or after the junction of the fuel lines from the two tanks. Regardless,
comingcross vent is mandatory. I have some pictures of mine & will try to locate
them.
Of course, you also need the external vents, which could be snorkels
becauseup from somewhere in the cross vent, or snorkels in the gas caps. Both
locations will put some positive air pressure into the tanks, which is a
good thing. Putting snorkels in the gas caps may be a little better,
withyou don't run the risk of a blockage in the cross vent line between
snorkel(s) and tank(s), and snorkels in the gas caps are easily tested
ina blow when you add fuel, etc.
Not sure about your descriptions of the other holes. The bottom-most hole
linethe root rib, about 7-8 inches forward of the torque tube, is for fuel
probesoutput. The hole in the bottom of the wing is for a fuel tester drain.
If you use capacitance probe gauges (or some float gauge type -- as far as
that goes) you'll need to cut a hole for them, per their installation
instructions. See the photo I linked to before, where the capacitance
are shown as a roughly 2.5" dia. black "hockey puck" circle near the upper
forward part of the rib, about 2 inches forward of the cross vent
connection.
Ron
On Sat, Apr 19, 2008 at 10:20 AM, Craig Walls <snowyrvr@mtaonline.net>
wrote:
So, if I get this, the upper hole at the front of the root rib would be a
vent to the other tank, the lower hole at the front of the rib would be
for
the fuel gage, and the lower hole at the rear would be for the fuel
pick-up.
In my manual they show a cross vent between the two tanks with a metal
tube
that extends through the roof to get a ram air effect. Not sure if
that's
necessary, could probably do the same thing with those fuel caps with the
ram-air tubes built in.
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