Wet Tank Stringer Seal Angle Fittings

David Ricker · Post by **David Ricker** » Fri Feb 17, 2012 9:59 pm

Hi Folks

A few questions about the wet wing of our Elite, Rebel builders, pls stay with
us, I believe you can help since the wing is supposed to be almost identical.

We are fabricating the angle fittings which are used to help make the Pro-Seal
seals around the stringers & spar in the wet tank and have a question or two
about their sizing etc.

1. The fitting type which is used at the inner bulkhead/root rib of the tank at
the stringer locations, is it supposed to fit under the stringer (raise up the
stringer)? I have my doubts because this would raise the stringer by .062" from
the tank skin leaving a big gap and probably a significant dip in the tank skin
when the rivets are pulled. Should this be cut away under the stringer?

2. Same sort of question at the outboard tank bulkhead/rib, when you cut away
the angle fitting for the "J" of the stringer, here do you cut away the base so
the stringer stays in contact with the tank skin?

3. These angle pieces at the stringers seem oversize. They overlap the flange
of the ribs they are mounted to and interfere with the ridges embossed in the
bulkhead/ribs. The hole positions given also don't seem to be right, is there a
good reason for this or is this another case where the manual hints at the idea
but you are supposed to find your own solution? If it is correct I wish MAM
would say something in the manual about the reason........

4. As the angle pieces are defined in the manual, the ones which go in the front
upper & lower corners of the bulkhead/ribs leave significant gap to the tank
skin where they sit on the spar flanges, about the thickness of the spar, again
is there a reason or is it a case of make it fit yourself.

Thanks in advance,

Dave R.
Francine D.
Elite 583

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Mike Kimball · Post by **Mike Kimball** » Fri Feb 17, 2012 9:59 pm

My response would be that the little picture in the manual with the
dimensions of the gap seals around the stringers are barely even starting
points. My gap seals were all sorts of different sizes and shapes.
Whatever it took to cover the hole where the stringers pass the ribs. My
rivet locations for the gap seals were wherever it seemed to make the most
sense. I tried to make the flange on the gap seal meet the skin as best as
possible but I'm not really certain what, if any, purpose the flange served.
The whole idea is to seal the hole in the cutout of the rib. You also have
to dodge the rivets and whatever else gets in the way on the bottom skin on
the outboard rib of the tank. Lots of trial and error fitting, trimming,
and refitting until you close the gap as best you can. Then, don't spare
the proseal. I have a pretty large dam around each of these areas. Goop up
where the top skin will meet, get that skin on, rivet, then turn the wing
upside down so any flow of the proseal won't flow away from what you are
trying to seal. Then you still have another chance to smear more goop
through the access plates. This is all from my Super Rebel. Probably
applies to the Elite.

Mike Kimball
SR#044

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
David Ricker
Sent: Sunday, February 24, 2002 5:23 PM
To: murphy-rebel@dcsol.com
Subject: Wet Tank Stringer Seal Angle Fittings

Hi Folks

A few questions about the wet wing of our Elite, Rebel builders, pls stay
with
us, I believe you can help since the wing is supposed to be almost
identical.

We are fabricating the angle fittings which are used to help make the
Pro-Seal
seals around the stringers & spar in the wet tank and have a question or two
about their sizing etc.

1. The fitting type which is used at the inner bulkhead/root rib of the
tank at
the stringer locations, is it supposed to fit under the stringer (raise up
the
stringer)? I have my doubts because this would raise the stringer by .062"
from
the tank skin leaving a big gap and probably a significant dip in the tank
skin
when the rivets are pulled. Should this be cut away under the stringer?

2. Same sort of question at the outboard tank bulkhead/rib, when you cut
away
the angle fitting for the "J" of the stringer, here do you cut away the base
so
the stringer stays in contact with the tank skin?

3. These angle pieces at the stringers seem oversize. They overlap the
flange
of the ribs they are mounted to and interfere with the ridges embossed in
the
bulkhead/ribs. The hole positions given also don't seem to be right, is
there a
good reason for this or is this another case where the manual hints at the
idea
but you are supposed to find your own solution? If it is correct I wish MAM
would say something in the manual about the reason........

4. As the angle pieces are defined in the manual, the ones which go in the
front
upper & lower corners of the bulkhead/ribs leave significant gap to the tank
skin where they sit on the spar flanges, about the thickness of the spar,
again
is there a reason or is it a case of make it fit yourself.

Thanks in advance,

Dave R.
Francine D.
Elite 583

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Bob Patterson · Post by **Bob Patterson** » Fri Feb 17, 2012 9:59 pm

Hi Dave !

You're right ! The object is to keep the stringers tight against
the tank skin. The fittings are just to reduce the size of the hole,
and any trimming needed is fine .... (and the lip can go inside
the rib flange, if necessary, or just cut away the base of the fitting)

Some builders have placed these fittings on <both> sides of
the ribs, filling the middle with ProSeal. (Fasten one side,
squeeze in ProSeal, then fasten other side - a big, sticky reverse
Oreo cookie !)

One caution - don't make the J openings fit too tightly -
you want some ProSeal to ooze out all around & bond to the stringer
and the fitting.

....bobp

----------------------------------orig.------------------------------------
At 10:23 PM 2/24/02 -0400, you wrote:

Hi Folks

A few questions about the wet wing of our Elite, Rebel builders, pls stay with
us, I believe you can help since the wing is supposed to be almost identical.

We are fabricating the angle fittings which are used to help make the Pro-Seal
seals around the stringers & spar in the wet tank and have a question or two
about their sizing etc.

1. The fitting type which is used at the inner bulkhead/root rib of the

tank at

the stringer locations, is it supposed to fit under the stringer (raise up the
stringer)? I have my doubts because this would raise the stringer by .062"

from

the tank skin leaving a big gap and probably a significant dip in the tank skin
when the rivets are pulled. Should this be cut away under the stringer?

2. Same sort of question at the outboard tank bulkhead/rib, when you cut away
the angle fitting for the "J" of the stringer, here do you cut away the base so
the stringer stays in contact with the tank skin?

3. These angle pieces at the stringers seem oversize. They overlap the flange
of the ribs they are mounted to and interfere with the ridges embossed in the
bulkhead/ribs. The hole positions given also don't seem to be right, is

there a

good reason for this or is this another case where the manual hints at the idea
but you are supposed to find your own solution? If it is correct I wish MAM
would say something in the manual about the reason........

4. As the angle pieces are defined in the manual, the ones which go in the

front

upper & lower corners of the bulkhead/ribs leave significant gap to the tank
skin where they sit on the spar flanges, about the thickness of the spar, again
is there a reason or is it a case of make it fit yourself.

Thanks in advance,

Dave R.
Francine D.
Elite 583

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** UNSUBSCRIBE MURPHY-REBEL in the message body on a line by itself **
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David Ricker · Post by **David Ricker** » Fri Feb 17, 2012 9:59 pm

Bob & Mike

Thanks, what you say is about what I figured but just the same it is a good idea to
consult your knowledge base (the group!) when possible. Would be nice if MAM would
spend a little more time on the manual in some of these extra critical areas........

Thanks again,

Dave R.
Elite 583

Bob Patterson wrote:

Hi Dave !

You're right ! The object is to keep the stringers tight against
the tank skin. The fittings are just to reduce the size of the hole,
and any trimming needed is fine .... (and the lip can go inside
the rib flange, if necessary, or just cut away the base of the fitting)

Some builders have placed these fittings on <both> sides of
the ribs, filling the middle with ProSeal. (Fasten one side,
squeeze in ProSeal, then fasten other side - a big, sticky reverse
Oreo cookie !)

One caution - don't make the J openings fit too tightly -
you want some ProSeal to ooze out all around & bond to the stringer
and the fitting.

....bobp

----------------------------------orig.------------------------------------
At 10:23 PM 2/24/02 -0400, you wrote:
Hi Folks

A few questions about the wet wing of our Elite, Rebel builders, pls stay with
us, I believe you can help since the wing is supposed to be almost identical.

We are fabricating the angle fittings which are used to help make the Pro-Seal
seals around the stringers & spar in the wet tank and have a question or two
about their sizing etc.

1. The fitting type which is used at the inner bulkhead/root rib of the
tank at
the stringer locations, is it supposed to fit under the stringer (raise up the
stringer)? I have my doubts because this would raise the stringer by .062"
from
the tank skin leaving a big gap and probably a significant dip in the tank skin
when the rivets are pulled. Should this be cut away under the stringer?

2. Same sort of question at the outboard tank bulkhead/rib, when you cut away
the angle fitting for the "J" of the stringer, here do you cut away the base so
the stringer stays in contact with the tank skin?

3. These angle pieces at the stringers seem oversize. They overlap the flange
of the ribs they are mounted to and interfere with the ridges embossed in the
bulkhead/ribs. The hole positions given also don't seem to be right, is
there a
good reason for this or is this another case where the manual hints at the idea
but you are supposed to find your own solution? If it is correct I wish MAM
would say something in the manual about the reason........

4. As the angle pieces are defined in the manual, the ones which go in the
front
upper & lower corners of the bulkhead/ribs leave significant gap to the tank
skin where they sit on the spar flanges, about the thickness of the spar, again
is there a reason or is it a case of make it fit yourself.

Thanks in advance,

Dave R.
Francine D.
Elite 583

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