Gentlemen
Thank you all for the lots of suggestions given on the subject.
I will put the vents up at the wing fairing as per Waine's and Bob's
suggestions. In this case, what would be the "safest" slope of the aluminum
tube in relation to the top wing skin in order to prevent syphoning? Or
should it be positioned in paralel to the top wing skin? I understand that
the tube/vent circuit should not have a "depression" between ends, where
fuel could stop and consequently neutralising the venting effect...
Bob / Dale, I have a doubt on your suggestions: HOW to fix the aluminum
tube in the top guage flange, from inside of the tank, using a "T" outside?
The flange is already riveted and prosealed in the root rib, hence my
initial idea of installing a fitting (AN-833-4D) in the root rib, just to
hold the tube in the rib.
Just one more thought on this subject, probably stupid: why not install the
tube vent at the wing fairing but in lower side of the wing (facing down)?
In this way, I think, shyphoning would be literally impossible to take place
(?!)
I hope to meet some of you, personally, at Sun'N'Fun! I understand thursday
will be the meeting day, right Bob?.
Jose / R#700
----- Original Message -----
From: "Bob Patterson" <
beep@sympatico.ca>
To: <
murphy-rebel@dcsol.com>
Sent: Friday, April 02, 2004 1:16 PM
Subject: Re: Fuel Tank venting
Hi Jose !
You could just tee off the top fuel guage fittings,
as has been suggested, and, I believe, the factory recommends.
There is no problem with this arrangement - there WAS a problem
with tee-ing off the BOTTOM guage fitting for the fuel flow,
but you have avoided that.
Ken has an excellent suggestion on venting from the
top front outside corner of the tank, but a bit tricky to get
the tube in place inside the tank, I suspect ...
In any case, DO NOT put the vent in the center, over the
cockpit ! The last thing you want is a fuel shower overhead !
It would be better to put inverted "J" tubes through the wing
root-to-fuselage fairings, one on each side - this makes them
accessible for service, and keeps any spills clear of the cockpit
& windshield. These can work individually, for each tank, or you
can tee them together with a cross tube - just beware of the
cross-flow of fuel if a large slope is caused by a flat tire or
uneven ground. Just a suggestion !
......bobp
----------------------------orig.-------------------
On Monday 22 March 2004 06:05 pm, you wrote:
Gentlemen
In principle, I intend to install a venting system as per Tony Bingellis
suggestions, i.e. , with a 1/4" aluminum tube in each tank
interconnected in the fuselage with the vent up into the top of cabin
(inverted "T " configuration).
To do this I have to drill an hole in each root solid rib to fit the
aluminum tube, holding it either with a flange or with a threaded
connection.
Is this acceptable? I am bit worried in drilling another hole in the
solid rib (already has 2 for the fuel level and 1 for fuel outlet).
In case this is acceptable, is there a preferential position for those
new holes in the solid ribs?
Other suggested venting configurations would be also welcome.
After this I will be (finally!), in position to install the tank cover
and move to the left wing.
Thanks on advance for you advice(s).
Jose / Brazil - Rebel # 700
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