Return-Path: Sender: (Marvin Kaye) To: lml Date: Wed, 09 Oct 2002 19:32:57 -0400 Message-ID: X-Original-Return-Path: Received: from smtp.comcast.net ([24.153.64.2] verified) by logan.com (CommuniGate Pro SMTP 4.0b9) with ESMTP id 1801581 for lml@lancaironline.net; Wed, 09 Oct 2002 19:20:01 -0400 Received: from cc1860069a (pcp01159630pcs.rocsth01.mi.comcast.net [68.62.26.174]) by mtaout01.icomcast.net (iPlanet Messaging Server 5.1 HotFix 1.4 (built Aug 5 2002)) with SMTP id <0H3Q005NSM5DH3@mtaout01.icomcast.net> for lml@lancaironline.net; Wed, 09 Oct 2002 19:20:01 -0400 (EDT) X-Original-Date: Wed, 09 Oct 2002 19:19:59 -0400 From: edechazal@comcast.net Subject: Delaminations X-Original-To: Lancair Mailing List X-Original-Message-id: <007101c26fea$641dcc20$ae1a3e44@rocsth01.mi.comcast.net> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 X-Mailer: Microsoft Outlook Express 5.50.4133.2400 Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT X-Priority: 3 X-MSMail-priority: Normal References: I'm in the midst of the second annual inspection on my 360. I've discovered two cases of delaminations that I want to raise here. The first is the trailing edge of the right elevator. The seam between the upper and lower halves has let go for a distance of about one foot midway along the span. It shows itself as a crack along the T.E. and is flexible vs. the normal condition. I now think this may be the source of my continuing struggle with vibration at higher speeds (I thought it was gear doors but no attempt there has been successful). I've rebonded the halves together, added some lead counterweight to balance, and will report back. The second delamination is the counter weight attachment on the left aileron. Specifically, it is the underside bid layer that wraps from the lead to the vertical forward face of the aileron. There are also three ribs here to add stiffness to prevent the vibration Rick Argente encountered early in his flight tests. I had placed these ribs on top of the original bid layup and then added additional bid to the ribs. All of this has separated from the front face of the aileron. This front face, by itself, does not contact the upper skin, there was no rib cap analogy here. My bid layups were intended to close this off and make the necessary front face to upper skin attachment. Has anyone else seen this kind of separation? I have not yet had a chance to check the right aileron. I'm wondering about causes. My preflight includes moving the ailerons at the surface and watching the stick move. Just habit. It was excessive flexibility and squeaking that caused me to look into it. Maybe the counterweight is vibrating in such a way to cause the delam. Any comments/ideas would be appreciated. Ed de Chazal N361DC