X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 29 Jan 2011 23:36:33 -0500 Message-ID: X-Original-Return-Path: Received: from nm28-vm0.bullet.mail.ne1.yahoo.com ([98.138.91.22] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with SMTP id 4828875 for lml@lancaironline.net; Thu, 27 Jan 2011 19:30:00 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.91.22; envelope-from=randylsnarr@yahoo.com Received: from [98.138.90.50] by nm28.bullet.mail.ne1.yahoo.com with NNFMP; 28 Jan 2011 00:29:25 -0000 Received: from [98.138.89.168] by tm3.bullet.mail.ne1.yahoo.com with NNFMP; 28 Jan 2011 00:29:25 -0000 Received: from [127.0.0.1] by omp1024.mail.ne1.yahoo.com with NNFMP; 28 Jan 2011 00:29:25 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 57232.99871.bm@omp1024.mail.ne1.yahoo.com Received: (qmail 89909 invoked by uid 60001); 28 Jan 2011 00:29:24 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=NUcX1j8ifcFlvmwngiNTbj660PSJ51eoc/L7PicMRkfezzT/ptn7fyPus/Z/tZKM3W4TKWJ5o5w5Os7e5KHOz+ybR37Al2K0D4MEvWFaoZsHJ02x1FwbNXfG0DnKFxnDMdJ8zt3vpqvUoWKJGiEHpie0lwlLZQ8A9i3MFhl2GQQ=; X-Original-Message-ID: <103699.89637.qm@web111412.mail.gq1.yahoo.com> X-YMail-OSG: 3z0ujUwVM1mK1ZDlwU7IqGyXFu9uvz10hyu3lNFgwcQNUiY cSeKBr.NBoMYosWvZqVWZCoypMC3qsSVT_6Lur_Av5LWHEuGvgBxHjPg0KUm LTDYsAeYH7kjl8i79crOJvlsm992Aqr0_aH.U9kVDx.jdjpBUPZl__97K6VL 898KOGcsJWu3YwKkQL33BfZZ7WoFfgkmpDrMmBzHjqI31uFBCp_kgYNGYPt5 iyOs84Sm.YbSlt1uEZgtP7Tciykv14ZUghJOBdJZ2_BwT3zILgvGHqZqQfKX WAobT7VwWys4_EqSj7Fpr8lpfm00ygm_RJMkkpxIllG0cVoX6IEipuiZ10qT XZ5LzuYHbLeB_.9VDQYDZYnVTUA4He.VXPdEiEw0ul2Hw78SM2RaOTjirBjR rObO.Y2Ozp13r Received: from [76.8.220.21] by web111412.mail.gq1.yahoo.com via HTTP; Thu, 27 Jan 2011 16:29:23 PST X-Mailer: YahooMailClassic/11.4.20 YahooMailWebService/0.8.107.285259 X-Original-Date: Thu, 27 Jan 2011 16:29:23 -0800 (PST) From: randy snarr Subject: Re: [LML] Weeping wing tank. super cool trick to fix it!!! X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1515861051-1296174563=:89637" --0-1515861051-1296174563=:89637 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Terrence, Take a deep breath. I had a similar issue on mine and the cure was not that= bad. I have a trick that should help.. First the bad news, Remove the wing. (drain fuel first duh..) leave about a= pint in the tank. Once the wing is off you can find the leak by putting a small amount of neg= ative pressure on the tank and seal it up. You have to seal everything off = first. I would connect a tube to the fuel or vent line and just suck on the= tank with your mouth and then seal it off. You dont need much. I found this completely by accident. You never get all the fuel out and in = this case that is ok. A pint of fuel in the tank is good for this trick. With a little negative p= ressure on the tank, rotate the wing and force the fuel around all the corn= ers in the tank where the suspected leak is and listen carefully with your = ear. When the fuel covers the hole in the tank you will hear the air bubble= s passing through the fuel as it enters the tank. The empty wing is like a = drum and the sound is amplified. I had a leak and found it at bottom front = corner of the tank where the tank close out rib meets the lower skin forwar= d at the spar. Now you know where the leak is.You can now remove the pint o= r so of fuel and dry out the tank. I used an alum rod with paper towels tap= ed to the end to get it dry in the corner where gravity collects it. Once i= t is DRY. orient the wing so the leak is where gravity will take your seale= r. I used the same gray epoxy based tank sealer lance recommends. U used a = large seringe ( like for a cow) and injected about 1 cup of gray sealer as close to where the hole is through the gas cap hole.=20 You wont be able to see any of this but you can do it by feel. Move the tan= k around slightly to completely cover the entire area where the hole is. I = would seal up the tank again and put the negative pressure back on to push = some goo into the leak hole for 20 minutes or so. Release the negative pres= sure and Support the tank with the hole at the lowest point and let it cure= .=20 Shazam, no more leak.=20 Hope that helps.. Best, Randy Snarr=20 235/320 N694RS =A0( i mean real small as you can collapse your wing with too much!) "Flight by machines heavier than air is unpractical and insignificant, if n= ot utterly impossible" -Simon Newcomb, 1902 --- On Mon, 1/24/11, Terrence O'Neill wrote: From: Terrence O'Neill Subject: [LML] Weeping wing tank. To: lml@lancaironline.net Date: Monday, January 24, 2011, 5:57 AM This is a request for info on the possible similar experience of other LNC2= builder-fliers... a wing tank fuel leak. The very slow leak through the front wing spar, when fuel leveel is above a= bout half way up, is of course uninspectable because of the leading edge --= and further because it is possibly behind the root area secondary web ... = not to mention the fact that the spar web is sandwich construction and the = interior skin leak can propagate spanwise to another portal in the forward = web skin. So my question is, when I slosh-seal the tank, what is recommended as a pre= p for the tank inner surface? I've read MEK and another TankPrep stuff. For sealant I've looked at PR-1005-L, and at the automotive (supposedly) st= uff, and=A0 phenol novolac. Any suggestions soulfully appreciated, for this worrisome job. Thanks. terrence N211AL LNC2 235/320. -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html =0A=0A=0A --0-1515861051-1296174563=:89637 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Terrence,
Take a deep breath. I had a simi= lar issue on mine and the cure was not that bad.
I have a trick that sho= uld help..

First the bad news, Remove the wing. (drain fuel first du= h..) leave about a pint in the tank.

Once the wing is off you can fi= nd the leak by putting a small amount of negative pressure on the tank and = seal it up. You have to seal everything off first. I would connect a tube t= o the fuel or vent line and just suck on the tank with your mouth and then = seal it off. You dont need much.
I found this completely by accident. Yo= u never get all the fuel out and in this case that is ok.
A pint of fuel= in the tank is good for this trick. With a little negative pressure on the= tank, rotate the wing and force the fuel around all the corners in the tan= k where the suspected leak is and listen carefully with your ear. When the fuel covers the hole in the tank you will hear the air bubbles passing thr= ough the fuel as it enters the tank. The empty wing is like a drum and the = sound is amplified. I had a leak and found it at bottom front corner of the= tank where the tank close out rib meets the lower skin forward at the spar= . Now you know where the leak is.You can now remove the pint or so of fuel = and dry out the tank. I used an alum rod with paper towels taped to the end= to get it dry in the corner where gravity collects it. Once it is DRY. ori= ent the wing so the leak is where gravity will take your sealer. I used the= same gray epoxy based tank sealer lance recommends. U used a large seringe= ( like for a cow) and injected about 1 cup of gray sealer as close to wher= e the hole is through the gas cap hole.
You wont be able to see any of = this but you can do it by feel. Move the tank around slightly to completely= cover the entire area where the hole is. I would seal up the tank again and put the negative pressure back on to push some goo into the leak= hole for 20 minutes or so. Release the negative pressure and Support the t= ank with the hole at the lowest point and let it cure.
Shazam, no more = leak.
Hope that helps..
Best,
Randy Snarr
235/320
N694RS

 ( i mean real small as you can collapse your wing with too = much!)

"Flight by machines heavi= er than air is unpractical and insignificant, if not utterly impossible"
-Simon Newcomb, 1902

--- On Mon, 1/24/11, Terrence O'Neil= l <troneill@charter.net> wrote:

This is a request for info on the possible similar experience of other LNC2 builder-fliers... a = wing tank fuel leak.

The very slow leak through the front wing spar,= when fuel leveel is above about half way up, is of course uninspectable be= cause of the leading edge -- and further because it is possibly behind the = root area secondary web ... not to mention the fact that the spar web is sa= ndwich construction and the interior skin leak can propagate spanwise to an= other portal in the forward web skin.

So my question is, when I slos= h-seal the tank, what is recommended as a prep for the tank inner surface?<= br>I've read MEK and another TankPrep stuff.

For sealant I've looked= at PR-1005-L, and at the automotive (supposedly) stuff, and  phenol n= ovolac.
Any suggestions soulfully appreciated, for this worrisome job.Thanks.

terrence N211AL
LNC2 235/320.



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