X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2340174 for flyrotary@lancaironline.net; Wed, 19 Sep 2007 14:16:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta04.mail.rr.com with SMTP id <20070919181533.IIKS3980.cdptpa-omta04.mail.rr.com@edward2> for ; Wed, 19 Sep 2007 18:15:33 +0000 Message-ID: <000d01c7fae9$2c7f4250$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Strange Ignition? Date: Wed, 19 Sep 2007 14:16:18 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C7FAC7.A5321FF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_000A_01C7FAC7.A5321FF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I do not believe that is a significant factor, either, Al. After all, = we're suppose to do our ignition checks on the ground before take off = {:>). My understanding is that best power on the 13B has ignition = timing between 25-28 deg BTDC, so not surprising that the 20B would fall = in that range also. Sounds reasonable to me. Ed ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Wednesday, September 19, 2007 3:08 PM Subject: [FlyRotary] Re: Strange Ignition?=20 I wondered if perhaps one issue was that I was doing the ignition = check static, on the ground; where the combination of RPM and MAP would = be different than in the air. But on checking with Tracy's spreadsheet = on the timing settings, over a fairly broad range above about 4900 the = timing is (should be) in the range of 26 to 28 degrees BTDC. Al ------=_NextPart_000_000A_01C7FAC7.A5321FF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I do not believe that is a significant factor, = either,=20 Al.  After all, we're suppose to do our ignition checks on the = ground=20 before take off {:>).  My understanding is that best power on = the 13B=20 has ignition timing between 25-28 deg BTDC, so not surprising that the = 20B would=20 fall in that range also.  Sounds reasonable to me.
 
Ed
 
 
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Wednesday, September 19, = 2007 3:08=20 PM
Subject: [FlyRotary] Re: = Strange=20 Ignition?

I=20 wondered if perhaps one issue was that I was doing the ignition check = static,=20 on the ground; where the combination of RPM and MAP would be different = than in=20 the air.  But on checking with Tracy=92s = spreadsheet on=20 the timing settings, over a fairly broad range above about 4900 the = timing is=20 (should be) in the range of 26 to 28 degrees BTDC.

 

Al

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