X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 23 Jan 2010 15:20:21 -0500 Message-ID: X-Original-Return-Path: Received: from web57505.mail.re1.yahoo.com ([66.196.100.72] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with SMTP id 4093027 for lml@lancaironline.net; Sat, 23 Jan 2010 06:22:56 -0500 Received-SPF: none receiver=logan.com; client-ip=66.196.100.72; envelope-from=casey.gary@yahoo.com Received: (qmail 26704 invoked by uid 60001); 23 Jan 2010 11:22:20 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=pMNPbRHz4p9gUxDZ/dt/g6zOE/qcXEwOF2VvHAgq/6Urxy7J7vFVhQ3freFTd11IzcYDcXyWVghC8uKs0dchqaRZBIKOkoJf3fXATS0YUHmCrOL0PHtNQjBCPoXbOUDjyE/TiAMlI03DEbVl5Puefgs1BDfdcHCXhMj20Gd5YZc=; X-Original-Message-ID: <460497.25760.qm@web57505.mail.re1.yahoo.com> X-YMail-OSG: ms7FBf8VM1l2ikMW9dJNg.O9_rFqlXlgatHSI7cKEL7hexXI7t_fIFiuiyUSJjzUisouucfv_C_y4m9FuP5pQWdrMVQqvQh06PpIol6OlW0ogt0d292nteI_q.kTFw8bSY6nVf3cXk2uxoiGqi8VGsprnMpb9Qab9JsvEHt9M0bA2RrNljTuo_hur14LtoiErVJwB4pmeQ4zc8SJ3UCTTHbdT9HTzJgpgpfTcx_i0MYxrupCanvERwMb1ttetdAZer8GNTIanv7dAB06IYAqYkcVG7DKyMZ8Tvw1ahQkMPPy5pps409RBHb.Y3TQGumsfrvkqNOA5ga9v_8B215ber8- Received: from [97.122.158.185] by web57505.mail.re1.yahoo.com via HTTP; Sat, 23 Jan 2010 03:22:20 PST X-Mailer: YahooMailRC/272.7 YahooMailWebService/0.8.100.260964 References: X-Original-Date: Sat, 23 Jan 2010 03:22:20 -0800 (PST) From: Gary Casey Subject: Re: L-IV Alignment X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1769917451-1264245740=:25760" --0-1769917451-1264245740=:25760 Content-Type: text/plain; charset=us-ascii I'm not sure I understand the benefit of the greased plates as used for main gear alignment. I measured the toe-in of each of my main wheels when sitting on pavement and then made shims with the required angles. After installing, I lower the plane, rolled it back and forth and measured again. The change in angle was pretty much exactly what was predicted. It's not a matter of tweaking, measuring and tweaking again, so the value in going to the trouble of sitting the gear on greased plates escapes me. I did go to the trouble of measuring each wheel with respect to a centerline drawn on the floor instead of relative to each other - that keeps the plane from dog-tracking. Whether that is important or not, I don't know. Gary Casey ES, used to have excessive tire wear, now doesn't Re: [LML] L-IV Alignment January 22, 2010 3:08:55 PM MST From: "Matthew Collier" To: "" Bill, This grease plate method works pretty well. You can just use any kind of metal plate, it doesn't need to be that thick and the plastic sheet between them isn't necessary either. Just two metal sheets, aluminum or steel .125" or thicker with a good coating of grease between them is great. I like to make the bottom plate a couple inches larger than the top, and make sure the edges of the top plate are well deburred. Place one under each main gear and load the aircraft with the same weight you would like the wheels to align with. They will change angle slightly with load. I like to go toward the heavy side of where I think the plane will be most of the time since the tires will wear more under greater load anyway. Matthew Collier Fibercraft Inc. --0-1769917451-1264245740=:25760 Content-Type: text/html; charset=us-ascii
I'm not sure I understand the benefit of the greased plates as used for main gear alignment.  I measured the toe-in of each of my main wheels when sitting on pavement and then made shims with the required angles.  After installing, I lower the plane, rolled it back and forth and measured again.  The change in angle was pretty much exactly what was predicted.  It's not a matter of tweaking, measuring and tweaking again, so the value in going to the trouble of sitting the gear on greased plates escapes me.  I did go to the trouble of measuring each wheel with respect to a centerline drawn on the floor instead of relative to each other - that keeps the plane from dog-tracking.  Whether that is important or not, I don't know.
Gary Casey
ES, used to have excessive tire wear, now doesn't

Re: [LML] L-IV Alignment

January 22, 2010 3:08:55 PM MST
From:
"Matthew Collier" <ivdiggs@gmail.com>
To:
"" <lml@lancaironline.net>
Bill,
This grease plate method works pretty well. You can just use any kind of metal plate, it doesn't need to be that thick and the plastic sheet between them isn't necessary either. Just two metal sheets, aluminum or steel .125" or thicker with a good coating of grease between them is great. I like to make the bottom plate a couple inches larger than the top, and make sure the edges of the top plate are well deburred. Place one under each main gear and load the aircraft with the same weight you would like the wheels to align with. They will change angle slightly with load. I like to go toward the heavy side of where I think the plane will be most of the time since the tires will wear more under greater load anyway. 

Matthew Collier
Fibercraft Inc.
 

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