X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 31 Jul 2008 16:13:17 -0400 Message-ID: X-Original-Return-Path: Received: from QMTA04.westchester.pa.mail.comcast.net ([76.96.62.40] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTP id 3050303 for lml@lancaironline.net; Thu, 31 Jul 2008 15:43:31 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.40; envelope-from=mjrav@comcast.net Received: from OMTA04.westchester.pa.mail.comcast.net ([76.96.62.35]) by QMTA04.westchester.pa.mail.comcast.net with comcast id wh5Y1Z0070ldTLk54jis8Q; Thu, 31 Jul 2008 19:42:52 +0000 Received: from mjr ([24.60.93.168]) by OMTA04.westchester.pa.mail.comcast.net with comcast id wjip1Z00b3dxE203Qjis4F; Thu, 31 Jul 2008 19:42:52 +0000 X-Authority-Analysis: v=1.0 c=1 a=Ia-xEzejAAAA:8 a=CDYg_aSlqOCpRjSFCQ8A:9 a=RcMHDpQpZeA0xoocKTZv9TBVXawA:4 a=rC2wZJ5BpNYA:10 a=EzXvWhQp4_cA:10 a=8UL1S1SzPDgA:10 X-Original-Message-ID: <002601c8f345$d7f74a60$6401a8c0@mjr> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] LNC2 Vibration X-Original-Date: Thu, 31 Jul 2008 15:44:27 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1914 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1914 Try spinning the wheels ( on jacks ) just to see if they wobble. Then dismount the tires and tubes and inspect, remount. It sounds like nosewheel shimmy also. Make sure you have good shimmy dampening in the strut and tight nosewheel bearings. Then change the nosewheel tire and tube if the problem persists. Mark Ravinski 360 1443 hrs ----- Original Message ----- From: "Tom McNerney" To: Sent: Thursday, July 31, 2008 3:26 PM Subject: [LML] LNC2 Vibration Before I go and over engineer a problem, I thought I would get every ones expert advice first. It clearly has worked well for me in the past. (Thanks Grayhawk) I have what feels to be a classic case of warped rotors, but that isn't it. About the last half of the roll out I start to get a vibration from the right main gear. Or at least I think it is the right side. Thinking it was an easy fix I replaced the rotors with a new set. I think it is better, but that could be just in my head. The vibration is much worse under braking, but does exist while just rolling. As most vibrations, it seems to have a peak intensity at a certain speed. 30-50 mph I would guess. This has the original rubber cushion landing gear. So, here are my ideas.. Bad tire that is out of balance? Waaay out of balance. They are Chang Shin tires, so maybe I got what I paid for. haha Out of Alignment? This aircraft has had the service bulletin completed regarding the main gear reinforcement. Could this have caused an alignment issue? Nature of the beast? It has had this problem from the day I purchased it, so maybe it is just me. Although I hope not! Would love to hear some ideas or past experience with this. Thank a ton! Tom McNerney N54SG -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html