X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-da01.mx.aol.com ([205.188.105.143] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6078926 for lml@lancaironline.net; Fri, 22 Feb 2013 23:39:40 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.143; envelope-from=Sky2high@aol.com Received: from mtaomg-db04.r1000.mx.aol.com (mtaomg-db04.r1000.mx.aol.com [172.29.51.202]) by imr-da01.mx.aol.com (Outbound Mail Relay) with ESMTP id 4D30A1C0000B4; Fri, 22 Feb 2013 23:39:07 -0500 (EST) Received: from core-mtc001a.r1000.mail.aol.com (core-mtc001.r1000.mail.aol.com [172.29.235.1]) by mtaomg-db04.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 2CA05E000082; Fri, 22 Feb 2013 23:39:07 -0500 (EST) From: Sky2high@aol.com Full-name: Sky2high Message-ID: Date: Fri, 22 Feb 2013 23:39:07 -0500 (EST) Subject: Re: [LML] Nose Gear Strut To: lml@lancaironline.net CC: N4ZQ@verizon.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_b002.c5a4fb0.3e59a1ea_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1361594347; bh=2Bydq/GlUMg3YvIqBJG+8Cu2W3VRmrMzHbnHvbgYaIM=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=O5HKei7EXlT3CcjtTg+LHjX/iZ8BOK6xt5IjEUc3gadl8kqtFS3L8qD7O2bDsoRk2 +1WdgTz+vExe7SCpGN0Kgu/2OP7RLL3/+tWUII6uy2mfzoIwJtlLQ08bKQ8021uvVo UdUWD9MYh539AVIfpu5lgUU+SE+sHdx3vgFxz0kQ= X-AOL-SCOLL-SCORE: 0:2:434744736:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33ca512847eb3545 --part1_b002.c5a4fb0.3e59a1ea_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Angier, If there is oil under the flange on the fork (after the fork is taken off for inspection), there is an internal leak and internal seals must be replaced. It already sounds problematic if oil is leaking by the strut wiper seal. If Lancair still can add the self-centering option, you should consider doing that. However, that would have no bearing on the shimmy whilst taxiing. Grayhawk In a message dated 2/22/2013 6:35:33 P.M. Central Standard Time, N4ZQ@verizon.net writes: At the moment, my focus is intently riveted on my nose gear strut. On the 10th landing back at KBVY yesterday, I felt (for the first time), a momentary vibration in my control stick. It was brief, maybe lasting 2 seconds. I have no idea what nose wheel shimmy feels like, perhaps one of you with experience in this area could elaborate. So here's what I've got, my strut dates from 1995 and is not self centering. I've got 4ZQ up on jacks and and when turning the nose wheel from side to side, there is no sound that might indicate air bubbles inside. I do notice that there is greater resistance when turning the wheel to the left as compared to turning to the right. There is some evidence of oil dampness on the strut. I have not yet removed the fork to see if there is any oil pooling up inside. At this point, I'm guessing that if this were the case, I would see it leaking down along the fork. I'm told by Ross at the factory, that the principle cause of nose wheel shimmy is a lack of fork oil, no oil....no dampening, etc. So my plan is to release pressure from the strut, check the oil level and cycle the strut up/down until there is no sign of air bubbles. I got some 20 weight fork oil from the local Harley dealer. My plan with the strut extended and full of oil is to collapse the strut, close the valve, set the plane on its nose wheel and re-pressurise the strut, and go fly. I'm all ears for nose strut advice/suggestions. Angier Ames N4ZQ -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --part1_b002.c5a4fb0.3e59a1ea_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Angier,
 
If there is oil under the flange on the fork (after the fork is t= aken=20 off for inspection), there is an internal leak and internal seals must be= =20 replaced.  It already sounds problematic if oil is leaking by the stru= t=20 wiper seal.  If Lancair still can add the self-centering opt= ion,=20 you should consider doing that.  However, that would have no bearing o= n the=20 shimmy whilst taxiing.
 
Grayhawk
 
In a message dated 2/22/2013 6:35:33 P.M. Central Standard Time,=20 N4ZQ@verizon.net writes:
= At the=20 moment, my focus is intently riveted on my nose gear strut.
On the 10t= h=20 landing back at KBVY yesterday, I felt (for the first time), a momentary= =20 vibration in my control stick. It was brief, maybe lasting 2 seconds. I h= ave=20 no idea what nose wheel shimmy feels like, perhaps one of you with experi= ence=20 in this area could elaborate.
So here's what I've got, my strut dates = from=20 1995 and is not self centering. I've got 4ZQ up on jacks and and when tur= ning=20 the nose wheel from
side to side, there is no sound that might indicat= e air=20 bubbles inside. I do notice that there is greater resistance when turning= the=20 wheel to the left as compared to turning to the right. There is some evid= ence=20 of oil dampness on the strut. I have not yet removed the fork to see if t= here=20 is any oil pooling up inside. At this point, I'm guessing that if this we= re=20 the case, I would see it leaking down along the fork. I'm told by Ross at= the=20 factory, that the principle cause of nose wheel shimmy is a lack of fork = oil,=20 no oil....no dampening, etc.
So my plan is to release pressure from th= e=20 strut, check the oil level and cycle the strut up/down until there is no = sign=20 of air bubbles. I got some 20 weight fork oil from the local Harley deale= r. My=20 plan with the strut extended and full of oil is to collapse the strut, cl= ose=20 the valve, set the plane on its nose wheel and re-pressurise the strut, a= nd go=20 fly.

I'm all ears for nose strut advice/suggestions.

Angier= =20 Ames
N4ZQ



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