X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost04.isp.att.net ([207.115.11.54] verified) by logan.com (CommuniGate Pro SMTP 5.3c2) with ESMTP id 3985576 for flyrotary@lancaironline.net; Sun, 22 Nov 2009 12:55:21 -0500 Received-SPF: none receiver=logan.com; client-ip=207.115.11.54; envelope-from=keltro@att.net DKIM-Signature: v=1; q=dns/txt; d=att.net; s=dkim01; i=keltro@att.net; a=rsa-sha256; c=relaxed/relaxed; t=1258912522; h=Content-Type: MIME-Version:In-Reply-To:Message-Id:Date:Subject:To:From; bh=HCorv6 yj+YCgeJ7VC87ecCwS8tsj6IjROxUX0kq+V64=; b=pBlh1GsqqUADDq+uc8xz+xQ0S JwWoJyaFsunecVKgHxDqqpShruknnn5jM/LGJKILbCQivaAGmPMeEuSrJtI8g== Received: from fwebmail31.isp.att.net ([204.127.221.131]) by isp.att.net (frfwmhc04) with SMTP id <20091122175446H0400s05o8e>; Sun, 22 Nov 2009 17:54:46 +0000 X-Originating-IP: [204.127.221.131] Received: from [208.114.32.237] by fwebmail31.isp.att.net; Sun, 22 Nov 2009 17:54:45 +0000 From: "Kelly Troyer" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Ground isn't ground Date: Sun, 22 Nov 2009 17:54:45 +0000 Message-Id: <112220091754.10488.4B097AE50002C1F3000028F822243322829B0A02D29B9B0EBF019D9B040A05@att.net> In-Reply-To: X-Mailer: AT&T Message Center Version 1 (Mar 2 2009) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_10488_1258912485_0" --NextPart_Webmail_9m3u9jl4l_10488_1258912485_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Steve, I am a little dense this morning...............I am not comprehending "Big Oreo Cookie"........?? -- Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold -------------- Original message from "Steven W. Boese" : -------------- > > Steve, > Thank you for posting the information on the solution for the spark problem. The results are of particular interest to me since the routing of my ground to the starter sounds like it is identical to yours. The test I made that showed similar symptoms was based on the possibility that the EC2 and the CAS return were grounded in two different places and that noise generated in the ground between these two locations was degrading the CAS signal. If I understand correctly, the noise generated due to the starter current passing through the engine assembly is being injected into the CAS signals even though the CAS > circuits and the engine block are electrically isolated. > Benefiting from your troubles, I am fabricating a longer ground cable for installation in my plane. My inclination is to add this cable to the starter and retain the original one to the front cover. Removing the cable to the front cover would result in the ground for alternator passing through the big Oreo > cookie. Although the alternator currents are not as large as the starter > current, they are still significant, noisy, and more likely to cause problems > during normal operation rather than just during starting. > > Steve Boese > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_10488_1258912485_0 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_10488_1258912485_1" --NextPart_Webmail_9m3u9jl4l_10488_1258912485_1 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Steve,

I am a little dense this morning.......= ........I am not comprehending "Big Oreo Cookie"........??

--
Kelly Troyer
"Dyke Delta"_1= 3B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifol= d

-------------- Original message from "Steven W. Boese" <S= Boese@uwyo.edu>: --------------

>
> Steve,
>= ; Thank you for posting the information on the solution for the spark probl= em. The results are of particular interest to me since the routing of my gr= ound to the starter sounds like it is identical to yours. The test I made t= hat showed similar symptoms was based on the possibility that the EC2 and t= he CAS return were grounded in two different places and that noise generate= d in the ground between these two locations was degrading the CAS signal. I= f I understand correctly, the noise generated due to the starter current pa= ssing through the engine assembly is being injected into the CAS signals ev= en though the CAS
> circuits and the engine block are electrically i= solated.
> Benefiting from your troubles, I am fabricating a longer = ground cable for installation in my plane. My inclination is to add this ca= ble to the starter and retain the original one to the front cover. Removing= the cable to the front cover would result in the ground for alternator pas= sing through the big Oreo
> cookie. Although the alternator currents= are not as large as the starter
> current, they are still significa= nt, noisy, and more likely to cause problems
> during normal operati= on rather than just during starting.
>
> Steve Boese
>=
> --
> Homepage: http://www.flyrotary.com/
> Archive = and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html --NextPart_Webmail_9m3u9jl4l_10488_1258912485_1-- --NextPart_Webmail_9m3u9jl4l_10488_1258912485_0--