start leaking than wet wing tanks. You will find most 172 tanks have been
removed cleaned and rewelded during their life time. Every Zenair welded
tank I've had through the shop has been prepped and treated to a coat of
proseal on all the welded seems as the porosity of the welds leach auto
fuel. My neighbours North Star (super cub clone) had to have the tanks
pulled and rewelded last year (after 10 years of service) as they started
leaking from both wing flex and the drag/anti drag wires rubbing through.
This minuet flexing in any wing can cause the welded seams to crack open
(actually right beside the weld as the welds never break just the weakened
material beside it). If the tank was a wet wing style it can take all this
minuet movement in "style" as the seams are pliable. How often does a jets
wet wing get torn apart to be resealed? I don't know the answer but I doubt
very often, if ever.
May see you in Brampton next Sunday if weather permits!
Cheers,
Wayne G. O'Shea
www.irishfield.on.ca
----- Original Message -----
From: "Brian Lawson" <lawsonb@mnsi.net>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, March 02, 2002 12:19 PM
Subject: Re: Hello, from a newbie here.
Hey Wayne,
Thanks for the come-back guy.
Glad you picked up on this. You will have noticed that it was written
just a bit tongue-in-cheek, more as a descriptive of what stage of
completion Rebel 568 (?) is at than as a how-to-do. Sometime back,
well before my time, there was a club decision made to use fuel-tanks
instead of the as-designed wet-wings. Apparently there were rumours
that the wet-tanks were leaking on other craft. I've seen a message
from Murphy, and the cautions they advise about making sure the
J-stringers are continuous to the root, etc. That design and advice
has been followed. Someone made up aluminum welded tanks from the
dimensions they gave in the letter, but on my attempting to install
these recently, the tanks are about 1/4" too thick between the upper
and lower rib stringers (please excuse me if I don't get quite the
correct terminology on some "parts"), so a number of decisions have to
be made.
Should we change the rib thickness to accommodate these as-done? or
Should we "crunch" the tanks so they form with clearance between the
ribs? (We tried this, and to a point it worked, BUT we're not happy
and would have to go more "crunch")? or
Should we try to cut these tanks down and re-weld? or
Can we at this point reasonably revert to wet-tanks?
Do wet tanks leak over time, even when done properly?
Just back in my first posting to this group/list, I mentioned that I
would have lots of questions "'later". The reason for "later" was
that I was hoping that we could attend the up-coming Rebel "meeting"
and get some experienced views. If that doesn't happen, "I'll be
back!!"
Thanks for your interest Wayne, and PLEASE do keep an eye on me for
obvious or subtle screw-ups I post.
Thanks again.
Brian Lawson,
Windsor, Ontario.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
On Sat, 2 Mar 2002 10:15:56 -0500, you wrote:
WhatBrian, thought maybe someone else would have caught that one liner (I
clipped from your e-mail below), but since I did I have to question it!
(ifhave you/they done for a fuel tank? If it compromises ANY of the wing ribs,
or ANY of the wing stringers, original locations then you have compromised
the structural integrity of the wing. Not being nosey, just don't like to
loose fellow aviation'ists!!!
No reason for the wet wing tanks to leak if they are done properly. Most
** To unsubscribe, send e-mail to list-server@dcsol.com with **not all) of the jet fleet use a wet wing, as are the new Cessna singles
(with a rediculous number of wing sump drains I may add!).
Regards,
Wayne G. O'Shea
www.irishfield.on.ca
----- Original Message -----
From: "Brian Lawson" <lawsonb@mnsi.net>
To: <murphy-rebel@dcsol.com>
Sent: Friday, March 01, 2002 2:11 AM
Subject: Re: Hello, from a newbie here.
and with (at this point in time) fuel tanks that are a bit
too big but to be for the last time installed maybe if we can decide
to use them or revert to the wet wing tanks and if so find out if
skin-deep-sloshers will leak and if we can install them (the wet ones)
as-built or do we have to start over?? Brian Lawson
Windsor, Ontario.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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