X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 5.0.7f) with ESMTP id 950283 for flyrotary@lancaironline.net; Mon, 23 Jan 2006 08:44:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.72; envelope-from=sladerj@bellsouth.net Received: from ibm68aec.bellsouth.net ([65.2.89.54]) by imf24aec.mail.bellsouth.net with ESMTP id <20060123134301.FNBX3127.imf24aec.mail.bellsouth.net@ibm68aec.bellsouth.net> for ; Mon, 23 Jan 2006 08:43:01 -0500 Received: from JSLADE ([65.2.89.54]) by ibm68aec.bellsouth.net with ESMTP id <20060123134300.VSJR20827.ibm68aec.bellsouth.net@JSLADE> for ; Mon, 23 Jan 2006 08:43:00 -0500 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Variable RPM? Date: Mon, 23 Jan 2006 08:42:58 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01D1_01C61FF9.030980B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_01D1_01C61FF9.030980B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit I'd say 4700 is the right number. This only happens during run-up. I was wondering if it might be something with the injector circuit. -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Tracy Crook Sent: Monday, January 23, 2006 8:31 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Variable RPM? 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 ----- From: John Slade To: Rotary motors in aircraft 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. 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. Any thoughts? John ------=_NextPart_000_01D1_01C61FF9.030980B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I'd say 4700 is the right number. = This only=20 happens during run-up.

I was wondering if it might be = something=20 with the injector circuit.

-----Original Message-----
From: Rotary motors = in=20 aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Tracy = Crook
Sent: Monday, January 23, 2006 8:31 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Variable=20 RPM?

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=20 is the "real" one, 4200 or 4700? Electrical noise (the bane of = the=20 composite aircraft builder) is a possibility.

Tracy

----- Original Message -----

From: John=20 Slade

To: Rotary motors in = aircraft=20

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=20 of 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, then drop to around 4200, then bounce around between 4700 = and 4200=20 without any movement of the throttle or change in engine sound.=20

Any=20 thoughts?

John

------=_NextPart_000_01D1_01C61FF9.030980B0--