Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Fri, 07 Nov 2003 11:13:39 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d04.mx.aol.com ([205.188.157.36] verified) by logan.com (CommuniGate Pro SMTP 4.1.6) with ESMTP id 2713834 for lml@lancaironline.net; Fri, 07 Nov 2003 11:09:24 -0500 Received: from Sky2high@aol.com by imo-d04.mx.aol.com (mail_out_v36_r1.1.) id q.9d.40b6e863 (3850) for ; Fri, 7 Nov 2003 11:08:49 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <9d.40b6e863.2cdd1d91@aol.com> X-Original-Date: Fri, 7 Nov 2003 11:08:49 EST Subject: Re: [LML] good news (speed) / bad news (resonance) X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1068221329" X-Mailer: Thailand for Windows sub 170 -------------------------------1068221329 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 11/7/2003 9:48:45 AM Central Standard Time, hapgoodm94@alum.darden.edu writes: The sound "sounds" like it is coming from the rear of the plane, but I can't really tell. It also "sounds" about the same as when I drop an inch of flaps at 140 KIAS to get slowed down to gear speed. Matt, After ignoring this for quite awhile (correcting other items higher on my list), I have a similar problem. However, mine seem to be rpm related, but does not sound like direct engine vibration. I have recently replaced the elevator hinge pins with .005 oversized stainless "piano wire" that makes the elevator looseness completely disappear. I still get the vibration at 2480 rpm and some lower settings, never in climb, always in an energetic pull-up, and nonexistent at WOT, 2700 rpm. ????? When I listen to the fuselage with a stethoscope, I do not pick up anything special? Right now I am investigating any possible engine to cowling contact. Then, nose gear door. I had the prop balanced this summer, but???? Scott Krueger Sky2high@aol.com II-P N92EX IO320 Aurora, IL (KARR) -------------------------------1068221329 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 11/7/2003 9:48:45 AM Central Standard Time, hapgoodm= 94@alum.darden.edu writes:

The sound "sounds" like it is coming from the=20= rear of the plane, but I can't
really tell. It also "sounds" about=20= the same as when I drop an inch of
flaps at 140 KIAS to get slowed down t= o gear speed.

Matt,

After ignoring this for quite awhile (correcting other items higher on=20= my list), I have a similar problem. However, mine seem to be rpm relat= ed, but does not sound like direct engine vibration. I have recently r= eplaced the elevator hinge pins with .005 oversized stainless "piano wire" t= hat makes the elevator looseness completely disappear. I still get the= vibration at 2480 rpm and some lower settings, never in climb, always in an= energetic pull-up, and nonexistent at WOT, 2700 rpm. ????? When I lis= ten to the fuselage with a stethoscope, I do not pick up anything special?&n= bsp; Right now I am investigating any possible engine to cowling contact.&nb= sp; Then, nose gear door. I had the prop balanced this summer, but????=

Scott Krueger
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL (KARR)

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