X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 24 Jan 2010 18:07:52 -0500 Message-ID: X-Original-Return-Path: Received: from mail-px0-f190.google.com ([209.85.216.190] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4093621 for lml@lancaironline.net; Sat, 23 Jan 2010 20:35:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.216.190; envelope-from=ivdiggs@gmail.com Received: by pxi28 with SMTP id 28so1715391pxi.7 for ; Sat, 23 Jan 2010 17:35:00 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=GGBTF6xAViXI/2QkaisDj39yyayR9d6bCfAuWmIsLIfUvAC6b1E1KSz34wvUWBulTw JYJ6DnADZDpP9+bq4MNKWBy/nPdm4yvb7jBP9PQAKug6LDRS6JE5D2JL52cKq3Wcc/TJ dyfVOrDe8Em1s+RulwiUkwBMsKnf4wD173O30= MIME-Version: 1.0 Received: by 10.115.112.6 with SMTP id p6mr3329851wam.7.1264296900395; Sat, 23 Jan 2010 17:35:00 -0800 (PST) In-Reply-To: References: X-Original-Date: Sat, 23 Jan 2010 17:35:00 -0800 X-Original-Message-ID: <77b9a8921001231735l208d13a8j360a5fba7432ad08@mail.gmail.com> Subject: Re: [LML] Re: L-IV Alignment From: Matthew Collier X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=0016e649c4eea384fc047ddf0f90 --0016e649c4eea384fc047ddf0f90 Content-Type: text/plain; charset=ISO-8859-1 Gary, I made the assumption that we were discussing the Lancair IV. The ES does not have the same issue since the angle of the leg is nearly straight down when viewed from the side. When viewing the IV from the side the legs go forward quite a ways from their attach point in the gearbox. This causes the toe and camber to change with load. The ES will almost only change in camber with changes in load. Toe being off by a degree or two (in opposite directions) will show excessive tire wear very quickly, while camber being off takes much longer and may never seem to be a problem. Matthew Collier Fibercraft Inc. On Sat, Jan 23, 2010 at 12:20 PM, Gary Casey wrote: > 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. > > > --0016e649c4eea384fc047ddf0f90 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Gary,
I made the assumption that we were discussing the Lancair IV. The = ES does not have the same issue since the angle of the leg is nearly straig= ht down when viewed from the side. When viewing the IV from the side the le= gs go forward quite a ways from their attach point in the gearbox. This cau= ses the toe and camber to change with load. The ES will almost only change = in camber with changes in load. Toe being off by a degree or two (in opposi= te directions) will show excessive tire wear very quickly, while camber bei= ng off takes much longer and may never seem to be a problem.

Matthew Collier
Fibercraft Inc.


On Sat, Jan 23, 2010 at 12:20 PM, Gary Casey <casey.gary@yahoo.com> wrote= :
I'm not s= ure I understand the benefit of the greased plates as used for main gear al= ignment. =A0I measured the toe-in of each of my main wheels when sitting on= pavement and then made shims with the required angles. =A0After installing= , I lower the plane, rolled it back and forth and measured again. =A0The ch= ange in angle was pretty much exactly what was predicted. =A0It'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. =A0I did go to the trouble of measuring each wheel with respec= t to a centerline drawn on the floor instead of relative to each other - th= at keeps the plane from dog-tracking. =A0Whether that is important or not, = I don't know.
Gary Casey
ES, used to have excessive tire wear, now doesn&#= 39;t

Re: [LML] L-IV Alignment

January 22, 2010 = 3:08:55 PM MST
From:
"Matthew Collier" <<= a href=3D"mailto:ivdiggs@gmail.com" style=3D"color: blue; text-decoration: = underline;" target=3D"_blank">ivdiggs@gmail.com>
<= /div>
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 eit= her. 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 pla= te 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 a= ircraft 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.=A0

Matthew Collier
Fibercraft Inc.
=A0


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