X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 09 Jan 2012 10:05:21 -0500 Message-ID: X-Original-Return-Path: Received: from imr-ma01.mx.aol.com ([64.12.206.39] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTP id 5342749 for lml@lancaironline.net; Mon, 09 Jan 2012 08:31:01 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.39; envelope-from=MikeEasley@aol.com Received: from mtaomg-mb05.r1000.mx.aol.com (mtaomg-mb05.r1000.mx.aol.com [172.29.41.76]) by imr-ma01.mx.aol.com (8.14.1/8.14.1) with ESMTP id q09DUAc2023134 for ; Mon, 9 Jan 2012 08:30:10 -0500 Received: from core-mkb003c.r1000.mail.aol.com (core-mkb003.r1000.mail.aol.com [172.29.98.9]) by mtaomg-mb05.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 48382E00008B for ; Mon, 9 Jan 2012 08:30:10 -0500 (EST) From: MikeEasley@aol.com X-Original-Message-ID: <6a6b.240dfd85.3c3c45e2@aol.com> X-Original-Date: Mon, 9 Jan 2012 08:30:10 -0500 (EST) Subject: Re: [LML] Re: Gear shimmy X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_6a6b.240dfd85.3c3c45e2_boundary" X-Mailer: AOL 9.7 sub 19 X-Originating-IP: [67.190.35.146] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:474131584:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d294c4f0aebe2044e --part1_6a6b.240dfd85.3c3c45e2_boundary Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en Pete, =20 One other place that should be checked is the bearing blocks at the top of = =20 the nose gear strut. There are two bearings that are pressed into the =20 bearing blocks. When they're fully inserted into the bearing blocks they = hold=20 the strut posts securely with no play. But after time, they can slip=20 outboard and allow the top of the strut to move laterally. I made two "do= nuts"=20 from aluminum tubing that keep the bearings fully inserted into the=20 blocks. Drew Dickinson down in Texas originally discovered this one. =20 Mike Easley Colorado Springs =20 =20 In a message dated 1/8/2012 6:59:28 P.M. Mountain Standard Time, =20 pete@leapfrogventures.com writes: =20 Paul, =20 Thanks for the feedback. I do have the Lancair casting for jacking the=20 plane, which is great for changing tires and brakes, but it does not help = for=20 checking whether the gear leg is loose in the upper socket. I borrowed a= =20 wing jack and a carpeted 12=E2=80=9D square pad from my local mechanic and= was able=20 to get the gear off of the ground. The legs seemed as tight as they were= =20 when first installed.=20 Note that I have had absolutely no shimmy for the first 250 hours I have= =20 flown the plane. It just showed up a month or so ago. Maybe a brake=20 issue? I don=E2=80=99t feel it on initial roll-out, just as I slow betwee= n 40 to 20 =20 knots.=20 I=E2=80=99ll do a search on the other forum. Again, thanks for the assist= ance.=20 =20 Pete =20 =20 From: Paul Bricker [mailto:pbricker@att.net]=20 Sent: Thursday, January 05, 2012 10:59 AM To: lml@lancaironline.net Subject: Re: [LML] Gear shimmy =20 Pete, =20 First with the easy question. There is a casting you can buy from Lancair= =20 parts that "clips" around the lower end of the gear leg and provides a jac= k=20 point for a floor jack. You'll also want this during condition inspections= =20 when you remove the wheels to repack the bearings. If you can't get one=20 from Redmond let me know off list. I may know where an 'extra" is. =20 =20 The shimmy question has been explored, investigated, experimented on, =20 photographed, argued over, and generally beaten by many on this list. Main = =20 gear leg movement is one of what, by my count, appears to be 3 possible =20 causes. The others are loss of damping in the strut, and movement in the mo= unt =20 between the strut and the motor mount. I'm sure other people will soon jump= in=20 with all the other causes I've forgotten.=20 =20 =20 I recommend joining the [Lancair_ES] list. Their archives should have more= =20 details on this ES issue. There are many who have worked this problem =20 diligently who monitor this list, so standby for more advise. =20 =20 Paul Bricker =20 _pbricker@att.net_ (mailto:pbricker@att.net)=20 =20 =20 From: "_pete@leapfrogventures.com_ (mailto:pete@leapfrogventures.com) "=20 <_pete@leapfrogventures.com_ (mailto:pete@leapfrogventures.com) > Reply-To: Lancair Mailing List <_lml@lancaironline.net_=20 (mailto:lml@lancaironline.net) > Date: Wed, 04 Jan 2012 16:38:21 -0500 To: <_lml@lancaironline.net_ (mailto:lml@lancaironline.net) > Subject: [LML] Gear shimmy =20 =20 =20 After 250 shimmy free hours, I am now getting gear shimmy when my ES-P=20 slows down through about 30 knots. I think I recall folks saying this is = due=20 to looseness in the upper main gear leg sockets. Is this correct, or is= =20 there another cause? My strut (new version) looks fine.=20 If it is loose main gear, how do you suggest that I get the main gear off= =20 of the ground? There are no obvious jack points.=20 Thanks for the advice!=20 Pete =3D --part1_6a6b.240dfd85.3c3c45e2_boundary Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
Pete,
 
One other place that should be checked is the bearing blocks at the to= p of=20 the nose gear strut.  There are two bearings that are pressed into the= =20 bearing blocks.  When they're fully inserted into the bearing blocks t= hey=20 hold the strut posts securely with no play.  But after time, they=20 can slip outboard and allow the top of the strut to move laterally.&nb= sp; I=20 made two "donuts" from aluminum tubing that keep the bearings fully inserte= d=20 into the blocks.  Drew Dickinson down in Texas originally discovered t= his=20 one.
 
Mike Easley
Colorado Springs
 
In a message dated 1/8/2012 6:59:28 P.M. Mountain Standard Time,=20 pete@leapfrogventures.com writes:
=

Paul,

 

Thanks for the feedback= .  I=20 do have the Lancair casting for jacking the plane, which is great for cha= nging=20 tires and brakes, but it does not help for checking whether the gear leg = is=20 loose in the upper socket.  I borrowed a wing jack and a carpeted 12= =E2=80=9D=20 square pad from my local mechanic and was able to get the gear off of the= =20 ground.  The legs seemed as tight as they were when first=20 installed.

 

Note that I have had ab= solutely=20 no shimmy for the first 250 hours I have flown the plane.  It just s= howed=20 up a month or so ago.   Maybe a brake issue?  I don=E2=80= =99t feel it=20 on initial roll-out, just as I slow between 40 to 20=20 knots.

 

I=E2=80=99ll do a searc= h on the other=20 forum.  Again, thanks for the assistance.

 

Pete

 

From: Paul Brick= er=20 [mailto:pbricker@att.net]
Sent: Thursday, January 05, 2012 10:= 59=20 AM
To: lml@lancaironline.net
Subject: Re: [LML] Gear= =20 shimmy

 

Pete,

First=20 with the easy question. There is a casting you can buy from Lancair parts= that=20 "clips" around the lower end of the gear leg and provides a jack point fo= r a=20 floor jack. You'll also want this during condition inspections when you r= emove=20 the wheels to repack the bearings. If you can't get one from Redmond let = me=20 know off list. I may know where an 'extra" is.

 

The=20 shimmy question has been explored, investigated, experimented on,=20 photographed, argued over, and generally beaten by many on this list. Mai= n=20 gear leg movement is one of what, by my count, appears to be 3 possible= =20 causes. The others are loss of damping in the strut, and movement in the = mount=20 between the strut and the motor mount. I'm sure other people will soon ju= mp in=20 with all the other causes I've forgotten. 

 

I=20 recommend joining the [Lancair_ES] list. Their archives should have more= =20 details on this ES issue. There are many who have worked this problem=20 diligently who monitor this list, so standby for more=20 advise.

 

Paul=20 Bricker

pbricker@att.net

 

From: "pete@leapfrogventures.com" = <pete@leapfrogventures.com&g= t;
Reply-To:=20 Lancair Mailing List <lml@lancaironline.net>
Date:=20 Wed, 04 Jan 2012 16:38:21 -0500
To: <lml@lancaironline.net>
Subject:=20 [LML] Gear shimmy

 

After 250 shimmy free h= ours, I=20 am now getting gear shimmy when my ES-P slows down through about 30=20 knots.  I think I recall folks saying this is due to looseness in th= e=20 upper main gear leg sockets.  Is this correct, or is there another= =20 cause?  My strut (new version) looks fine.

 

If it is loose main gea= r, how do=20 you suggest that I get the main gear off of the ground?  There are n= o=20 obvious jack points.

 

Thanks for the=20 advice!

 

Pete

=3D
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