X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.76] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.7f) with ESMTP id 950264 for flyrotary@lancaironline.net; Mon, 23 Jan 2006 08:31:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.76; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 23 Jan 2006 05:30:51 -0800 Message-ID: Received: from 4.171.129.151 by BAY115-DAV4.phx.gbl with DAV; Mon, 23 Jan 2006 13:30:50 +0000 X-Originating-IP: [4.171.129.151] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Variable RPM? Date: Mon, 23 Jan 2006 08:30:48 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D0_01C61FF7.5007CEF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Mon, 23 Jan 2006 08:30:48 -0500 X-OriginalArrivalTime: 23 Jan 2006 13:30:51.0018 (UTC) FILETIME=[3A43F6A0:01C62021] This is a multi-part message in MIME format. ------=_NextPart_000_00D0_01C61FF7.5007CEF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable That is more than enough rpm change to hear (depending on the accuracy = of the hearer : ) so something is screwy. Which reading do you think is = the "real" one, 4200 or 4700? Electrical noise (the bane of the = composite aircraft builder) is a possibility. Tracy ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Monday, January 23, 2006 8:18 AM Subject: [FlyRotary] Variable RPM? Tracy, This discussion leads me to a question. My rpm reading seems accurate most of the time, but varies a lot = during a run-up.=20 For example, if I bring the rpm to 4700 rpm the rpm reading will = remain steady for a few seconds, then drop to around 4200, then bounce = around between 4700 and 4200 without any movement of the throttle or = change in engine sound.=20 Any thoughts? John ------=_NextPart_000_00D0_01C61FF7.5007CEF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
That is more than enough rpm change to hear (depending on the = accuracy of=20 the hearer : ) so something is screwy.  Which reading do you = think is=20 the "real" one, 4200 or 4700?  Electrical noise (the bane of the = composite=20 aircraft builder) is a possibility.
 
Tracy
----- Original Message -----
From: John=20 Slade
To: Rotary motors in = aircraft
Sent: Monday, January 23, 2006 = 8:18=20 AM
Subject: [FlyRotary] Variable = RPM?

Tracy,
This discussion leads me to a=20 question.
My rpm reading seems = accurate most of=20 the time, but varies a lot during a run-up.
For example, if I bring the rpm = to=20 4700 rpm the rpm reading will remain steady for a few = seconds,=20 then drop to around 4200, then bounce around between 4700 and 4200 = without any=20 movement of the throttle or change in engine sound.
Any=20 thoughts?
John
 
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