X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 16 Sep 2005 21:52:00 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m16.mx.aol.com ([64.12.138.206] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 724638 for lml@lancaironline.net; Fri, 16 Sep 2005 19:52:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.206; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m16.mx.aol.com (mail_out_v38_r5.5.) id q.7f.66a4cf89 (48576) for ; Fri, 16 Sep 2005 19:51:39 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <7f.66a4cf89.305cb48b@aol.com> X-Original-Date: Fri, 16 Sep 2005 19:51:39 EDT Subject: Re: [LML] Re: LNC2 elevator hinges X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1126914699" X-Mailer: 9.0 Security Edition for Windows sub 5009 X-Spam-Flag: NO -------------------------------1126914699 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/16/2005 11:58:44 A.M. Central Standard Time, bill_kennedy_3@hotmail.com writes: I'm worried about the forces that are causing this "excessive wear" on our hinge pins. Is it loose pins causing the flutter or flutter causing the loose pins. I'm not qualified to guess. I'd appreciate comments from someone who is. Bill, I'm not qualified BUT I did stay at a Holiday Inn Express once. Let's first make sure that we agree that you do not mean traditional "flutter" caused by an unbalanced control surface and some initial excitation. I don't have loose pins because of the oversized ones I am using. The "trails" are only on the outboard hinges of the small tail. (MKII tail uses center hinges with bearings). If I grab my vertical stab and horizontal stab and shake them, the movement about the airframe center line is, uh, interesting. So... Is my tail "wigglier" than others? What might the outboard excitation be? Airframe harmonics? Dirty air from the prop or wing? Spinning air striking the vertical? Worn out only 2 year old) engine isolators (soft)? Assuming that I have taken care of any engine part contacting the airframe or cowling (I have). Why now? BTW, I had a heck of a time removing the teflon tubing from the outboard hinges since they had flowed into the spaces between the hinge loops. That is why I saw little or no wear trails before - but I could not stand the looseness. Maybe the fellow that sells the "kit" uses something other than the teflon spagetti from McMaster-Carr and SS welding rod and maybe that's why his kit is expensive. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) -------------------------------1126914699 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 9/16/2005 11:58:44 A.M. Central Standard Time,=20 bill_kennedy_3@hotmail.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I'm=20 worried about the forces that are causing this "excessive wear" on our=20
hinge pins. Is it loose pins causing the flutter or flutter causing th= e=20
loose pins. I'm not qualified to guess. I'd appreciate comments from=20 someone
who is.

Bill,

I'm not qualified BUT I did stay at a Holiday Inn Express once. L= et's=20 first make sure that we agree that you do not mean traditional "flutter" cau= sed=20 by an unbalanced control surface and some initial excitation. I don't=20= have=20 loose pins because of the oversized ones I am using. The "trails" are=20= only=20 on the outboard hinges of the small tail. (MKII tail uses center hinges with= =20 bearings). If I grab my vertical stab and horizontal stab and shake=20 them, the movement about the airframe center line is, uh,=20 interesting. So...

Is my tail "wigglier" than others?

What might the outboard excitation be? Airframe harmonics? D= irty=20 air from the prop or wing? Spinning air striking the vertical? Worn ou= t=20 only 2 year old) engine isolators (soft)? Assuming that I have taken c= are=20 of any engine part contacting the airframe or cowling (I have). Why=20 now?

BTW, I had a heck of a time removing the teflon tubing from the outboar= d=20 hinges since they had flowed into the spaces between the hinge loops. =20= That=20 is why I saw little or no wear trails before - but I could not stand the=20 looseness. Maybe the fellow that sells the "kit" uses something other=20= than=20 the teflon spagetti from McMaster-Carr and SS welding rod and maybe tha= t's=20 why his kit is expensive.=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

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