X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1991697 for flyrotary@lancaironline.net; Wed, 18 Apr 2007 09:45:02 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao103.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070418134357.ZGQD1226.fed1rmmtao103.cox.net@fed1rmimpo01.cox.net> for ; Wed, 18 Apr 2007 09:43:57 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo01.cox.net with bizsmtp id odjw1W0071xAn3c0000000; Wed, 18 Apr 2007 09:43:56 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Power source isolation Date: Wed, 18 Apr 2007 06:44:45 -0800 Message-ID: <000201c781c8$1b782750$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01C78185.0D54E750" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C78185.0D54E750 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I find it a bit curious that the posting below that I sent on Sunday = didn't get posted until Tuesday. Do you suppose it was intercepted and = reviewed by the 'internet police'; because there are/were a few words in there which might have attracted attention? All my other e-mails have been going in = a timely manner. Anyone notice e-mails delayed on this list? =20 Al (slightly paranoid) =20 Joe; =20 We are still trying to resolve the settings [delete] issue, and have = added a number of additional filters on the board, the effectiveness of which is = yet to be proven. Regarding the isolation diodes, I also have Schottky = diodes between the batteries and the 'hot' bus that feeds the injector and the = coil power to prevent a failure in one battery circuit from affecting the = other. It may be that noise propagated in these circuits being isolated from = the battery is a more likely an issue than isolation of the power feeds to = the EC2. =20 The reality is that after putting filters at the coils to [delete] = spikes coming back from there, we do not see any noise levels on any pins = expected to be of concern. But since the problem still existed we assume that = there are some spikes at times we didn't observe; and in studying the = circuits, and what is different in my setup than others; we are speculating that = the isolation diodes could exacerbate the issue. More will be known in a = couple of weeks I as get some other changes/fixes completed, and get back in = the air. After a few low-power engine runs since the addition of the = filters, there has been no changes of settings noted so far. =20 Al ------=_NextPart_000_0003_01C78185.0D54E750 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I find it a = bit curious that the posting below that I sent on Sunday didn’t get = posted until Tuesday. Do you suppose it was intercepted and reviewed by = the ‘internet police’; because there are/were a few words in there which might = have attracted attention? All my other e-mails have been going in a = timely manner. Anyone notice e-mails delayed on this = list?

<= /font>

Al (slightly = paranoid)

Joe;

We are still trying to resolve the settings [delete] issue, and = have added a number of additional filters on the board, the effectiveness of which = is yet to be proven. Regarding the isolation diodes, I also have Schottky = diodes between the batteries and the ‘hot’ bus that feeds the = injector and the coil power to prevent a failure in one battery circuit from = affecting the other. It may be that noise propagated in these circuits being isolated from = the battery is a more likely an issue than isolation of the power feeds to = the EC2.

The reality is that after putting filters at the coils to = [delete] spikes coming back from there, we do not see any noise levels on any pins = expected to be of concern. But since the problem still existed we assume that = there are some spikes at times we didn’t observe; and in studying the = circuits, and what is different in my setup than others; we are speculating that = the isolation diodes could exacerbate the issue. More will be known in = a couple of weeks I as get some other changes/fixes completed, and get = back in the air. After a few low-power engine runs since the addition of = the filters, there has been no changes of settings noted so = far.

Al

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