X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Thu, 08 Feb 2007 16:13:05 -0500 Message-ID: X-Original-Return-Path: Received: from mtai03.charter.net ([209.225.8.183] verified) by logan.com (CommuniGate Pro SMTP 5.1.6) with ESMTP id 1824788 for lml@lancaironline.net; Thu, 08 Feb 2007 15:37:54 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.225.8.183; envelope-from=troneill@charter.net Received: from aa04.charter.net ([10.20.200.156]) by mtai03.charter.net (InterMail vM.6.01.06.03 201-2131-130-104-20060516) with ESMTP id <20070208203700.REUY21462.mtai03.charter.net@aa04.charter.net> for ; Thu, 8 Feb 2007 15:37:00 -0500 Received: from axs ([75.132.198.100]) by aa04.charter.net with SMTP id <20070208203700.WPWS1285.aa04.charter.net@axs> for ; Thu, 8 Feb 2007 15:37:00 -0500 X-Original-Message-ID: <005101c74bc0$e1ffcbf0$6501a8c0@axs> From: "terrence o'neill" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Wing Skin Fix Question X-Original-Date: Thu, 8 Feb 2007 14:36:59 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004E_01C74B8E.972E6D70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Chzlrs: 0 This is a multi-part message in MIME format. ------=_NextPart_000_004E_01C74B8E.972E6D70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mike, Many years ago similar problems were addressed in MIL HBK -17 and -23. = Perhaps an updated equivalent would suggest an acceptable method of = repair... gov't printing office? Terrence ----- Original Message -----=20 From: MikeEasley@aol.com=20 To: lml=20 Sent: Thursday, February 08, 2007 10:38 AM Subject: [LML] Re: Wing Skin Fix Question Rick, What about an extra fuel cap? :-) The real question is how do you get back the required structural = integrity without creating a high spot on the upper wing skin that = requires 5 gallons of primer and 40 hours to sand smooth. Even a 2 BID = on the outside would create a bodywork nightmare. Maybe structural = integrity is less of an issue that you might think. We have fuel caps, = speed brakes, etc. cut into our wing skins already. I like option C, open and clean, de-core the prepreg, fill and sand. = You might be able to slip in a 2 BID patch and Hysol it to the inside of = the hole with as much overlap as possible. A round hole won't allow for = overlap, but a square hole will. You could paint the inside of the = patch with fuel tank sealer. Removing the skin is out of the question, since we don't have jigs for = installing the upper skin. You could do a bottom skin "wing rip" and do = the repair from the inside, just like the wing re-closings. Mike ------=_NextPart_000_004E_01C74B8E.972E6D70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Mike,
 
Many years ago similar = problems were=20 addressed in MIL HBK -17 and -23.  Perhaps an updated equivalent = would=20 suggest an acceptable method of repair... gov't printing = office?
 
Terrence
----- Original Message -----
From:=20 MikeEasley@aol.com
To: lml
Sent: Thursday, February 08, = 2007 10:38=20 AM
Subject: [LML] Re: Wing Skin = Fix=20 Question

Rick,
 
What about an extra fuel cap?   :-)
 
The real question is how do you get back the required structural=20 integrity without creating a high spot on the upper wing skin that = requires 5=20 gallons of primer and 40 hours to sand smooth.  Even a 2 BID = on the=20 outside would create a bodywork nightmare.  Maybe structural = integrity is=20 less of an issue that you might think.  We have fuel caps, speed = brakes,=20 etc. cut into our wing skins already.
 
I like option C, open and clean, de-core the prepreg, fill and=20 sand.  You might be able to slip in a 2 BID patch and Hysol it to = the=20 inside of the hole with as much overlap as possible.  A round = hole won't=20 allow for overlap, but a square hole will.  You could paint the = inside of=20 the patch with fuel tank sealer.
 
Removing the skin is out of the question, since we don't have = jigs for=20 installing the upper skin.  You could do a bottom skin "wing rip" = and do=20 the repair from the inside, just like the wing re-closings.
 
Mike
 
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