The Murphy Builders Site

OK Wayne, now you have thrown the barroom chair, no fair running outside to
watch. We have sealed and completed our wings and with extended fuel and
rib baffles cannot inspect to confirm there is no root rib/stringer dam.
There are several courses of action which I can see as follows:

1- Do nothing
2- Add an additional sump drain on each side to the "lake" area. This
could be done externally without
opening the tank.
3- Cut the bottom tank skin and create a root rib/stringer water passage
or drill several small holes through the stringer web at the
bottom.
4- Add a small header tank to catch water at the low point on each side
behind each door. I believe we
will need sump drains there in any case and can confirm once the gear
is on.

Which of these do you think is best? Any other ideas for a fix? As a
related concern, how much of a problem are drilled rivet (shop) heads and
the small amount of drill cuttings that will result from any fix? I will
wet cloth, magnet search, and vacuum clean but there is no way to get it
all.

Anyone with other ideas, don't be bashful - chime in. I can't be the only
one affected.
Ralph Baker
Elite 624E (reserved)




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Didn't mean to get anyone upset! Just thought I would throw it out while the
opportunity presented itself!!

I wouldn't worry tooooo much about it, if you are already closed up!! The
right wing should be a none issue, as the rib flange is inside the tank
which will allow a 5/8" wide trough for the fuel/water to get by. On the
left wing (with the flange outside the tank) you <may> have the stringer
tight to the rib, but then again you may not. If you are seriously concerned
about it you could drill off the "filler plate", on the root rib, that
covers the cut out in the rib for stringers to pass by each rib. If yours
are on the outside of the rib pretty easy and you could just drill the rivet
heads off and leave the "shop" head in the tank covered by proseal. Peel off
the filler plate and, using a dremel (or similar) with a tiny cutwheel (or
even a round file), cut back the stringer just shy of the first rivet (or
even just a half moon cut out on the end to let the fuel/water flow by).
Drill a couple new holes in your filler plate and proseal and rivet it back
on. If your plate is nicely fastened to the inside of the tank, take a
"unibit" and drill into the filler plate in a location that as it goes in,
and the step size increases, that it will also hog out the half moon in the
stringer. Coat the bit with grease so it catches most of the chips. Then use
a vacuum, and a piece of 1/4" tube, to scavenge up the misc bits that don't
stick in the grease covered bit. Make a new little cover plate and proseal
it over the hole (of course being careful that none oozes into the stringer
cut out that you just made!!).

Cheers,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "Ralph Baker" <rebaker@ftc-i.net>
To: <murphy-rebel@dcsol.com>
Cc: <sscouten@ftc-i.net>
Sent: Thursday, April 18, 2002 9:57 PM
Subject: Stringers/water retention

OK Wayne, now you have thrown the barroom chair, no fair running outside

to

watch. We have sealed and completed our wings and with extended fuel and
rib baffles cannot inspect to confirm there is no root rib/stringer dam.
There are several courses of action which I can see as follows:

1- Do nothing
2- Add an additional sump drain on each side to the "lake" area. This
could be done externally without
opening the tank.
3- Cut the bottom tank skin and create a root rib/stringer water passage
or drill several small holes through the stringer web at the
bottom.
4- Add a small header tank to catch water at the low point on each side
behind each door. I believe we
will need sump drains there in any case and can confirm once the gear
is on.

Which of these do you think is best? Any other ideas for a fix? As a
related concern, how much of a problem are drilled rivet (shop) heads and
the small amount of drill cuttings that will result from any fix? I will
wet cloth, magnet search, and vacuum clean but there is no way to get it
all.

Anyone with other ideas, don't be bashful - chime in. I can't be the only
one affected.
Ralph Baker
Elite 624E (reserved)

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As Wayne points out the right wing will be a none issue.

However, On my left wing, second time around I notice that I'm pretty tight to the main rib and will cut stringer back about 1/4"! I suggest borrowing a boroscope if concerned and use fuel outlet hole to check. Hopefully no one will have been caught out but i
t
would have been nice if this was highlighted in the manual.

Regards,
Warren




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Surprising that this never came up despite a lot of fuel discussion a
few years ago. Shouldn't be a problem if a slug of trapped water gets
into the plumbing for those of us using a header tank.
Ken

Warren Montgomery wrote:

As Wayne points out the right wing will be a none issue.

However, On my left wing, second time around I notice that I'm pretty tight to the main rib and will cut stringer back about 1/4"! I suggest borrowing a boroscope if concerned and use fuel outlet hole to check. Hopefully no one will have been caught out but

it

would have been nice if this was highlighted in the manual.

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