X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 10 Oct 2007 08:13:13 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2378687 for lml@lancaironline.net; Wed, 10 Oct 2007 02:13:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=ASW20747@aol.com Received: from ASW20747@aol.com by imo-m25.mx.aol.com (mail_out_v38_r9.3.) id q.caa.19334597 (34989) for ; Wed, 10 Oct 2007 02:12:20 -0400 (EDT) Received: from FWM-M45 (fwm-m45.webmail.aol.com [64.12.193.247]) by cia-db01.mx.aol.com (v119.11) with ESMTP id MAILCIADB012-88ad470c4fc13ae; Wed, 10 Oct 2007 00:06:25 -0400 X-Original-To: lml@lancaironline.net Subject: Legacy Engine/Prop/Speed/ Vibration? X-Original-Date: Wed, 10 Oct 2007 00:06:25 -0400 X-MB-Message-Source: WebUI X-MB-Message-Type: User MIME-Version: 1.0 From: asw20747@aol.com Content-Type: multipart/alternative; boundary="--------MB_8C9D90A0F377F31_29C_5CEB_FWM-M45.sysops.aol.com" X-Mailer: AOL WebMail 31361-STANDARD Received: from 69.237.184.32 by FWM-M45.sysops.aol.com (64.12.193.247) with HTTP (WebMailUI); Wed, 10 Oct 2007 00:06:25 -0400 X-Original-Message-Id: <8C9D90A0F377F31-29C-2DF9@FWM-M45.sysops.aol.com> X-AOL-IP: 64.12.193.247 X-Spam-Flag: NO ----------MB_8C9D90A0F377F31_29C_5CEB_FWM-M45.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Hi All: Just wondering if anyone has an idea on which way to go to start trouble shooting this problem. Here are the particulars: I have a Legacy with about 120 hrs on it.? Performance Engines IO-550 / Hartzell Prop / Mags. It has been running exceptionally well, very smooth until just yesterday when I first noticed a sort of nondescript rumble/vibration after a long descent at relatively high speed, from 17,500'. As we slowed to enter the pattern for landing it cleared up and everything seemed normal.? I went out and flew today to see if it was just an anomaly......apparently it was NOT. *? A download of all the engine parameters was normal...... nothing out of the ordinary. *? Engine run-up and full power run were all normal/smooth. *? Takeoff and initial climb out were all normal with no vibration UNTIL we accelerated through approximately 165kts. *? At 165kts and greater, on three successive flights, we felt a distinct cyclical type vibration setting up.? It's a bit hard to describe in words but it does NOT seem to be a steady????????????? vibration (like a gear door) but seems to feel almost like a prop out of balance. *? Without touching the power or prop we can make the vibration go away by raising the nose and slowing < 165kts. *? When we do get the vibration > 165kts..... you can mitigate it somewhat by increasing prop RPM.? The vibration is still there but not has bad. * The prop is NOT surging in any way, RPM's are rock steady and remain where they are set. *? The issue is serious enough, in my mind, that I am DRIVING tomorrow from San Diego to Las Vegas.......and I HATE driving;))) So in summary, it seems this vibration just happened somewhat spontaneously (ie. not progressively worsened over time) and although were not ruling anything out, it seems to be Engine/Prop/Speed related. We would GREATLY appreciate any ideas, comments, suggestions.... we are kind of at a loss as to which way to head in troubleshooting/fixing this problem. Best regards, Erik Larson asw20747@aol.com (619) 301-7475 ________________________________________________________________________ Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com ----------MB_8C9D90A0F377F31_29C_5CEB_FWM-M45.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"

Hi All:

Just wondering if anyone has an idea on which way to go to start trouble shooting this problem.

Here are the particulars:

I have a Legacy with about 120 hrs on it.  Performance Engines IO-550 / Hartzell Prop / Mags.

It has been running exceptionally well, very smooth until just yesterday when I first noticed a sort of nondescript rumble/vibration after a long descent at relatively high speed, from 17,500'.

As we slowed to enter the pattern for landing it cleared up and everything seemed normal.  I went out and flew today to see if it was just an anomaly......apparently it was NOT.

*  A download of all the engine parameters was normal...... nothing out of the ordinary.
*  Engine run-up and full power run were all normal/smooth.
*  Takeoff and initial climb out were all normal with no vibration UNTIL we accelerated through approximately 165kts.
*  At 165kts and greater, on three successive flights, we felt a distinct cyclical type vibration setting up.  It's a bit hard to describe in words but it does NOT seem to be a steady              vibration (like a gear door) but seems to feel almost like a prop out of balance.
*  Without touching the power or prop we can make the vibration go away by raising the nose and slowing < 165kts.
*  When we do get the vibration > 165kts..... you can mitigate it somewhat by increasing prop RPM.  The vibration is still there but not has bad.
* The prop is NOT surging in any way, RPM's are rock steady and remain where they are set.
*  The issue is serious enough, in my mind, that I am DRIVING tomorrow from San Diego to Las Vegas.......and I HATE driving;)))

So in summary, it seems this vibration just happened somewhat spontaneously (ie. not progressively worsened over time) and although were not ruling anything out, it seems to be Engine/Prop/Speed related.

We would GREATLY appreciate any ideas, comments, suggestions.... we are kind of at a loss as to which way to head in troubleshooting/fixing this problem.

Best regards,

Erik Larson

asw20747@aol.com
(619) 301-7475




Email and AIM finally together. You've gotta check out free AOL Mail!
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