X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao106.cox.net ([68.230.241.40] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2155841 for flyrotary@lancaironline.net; Tue, 03 Jul 2007 12:07:23 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.40; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao106.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20070703160645.CAYZ3098.fed1rmmtao106.cox.net@fed1rmimpo02.cox.net> for ; Tue, 3 Jul 2007 12:06:45 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id K46k1X00c1xAn3c0000000; Tue, 03 Jul 2007 12:06:45 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: FW: Phase 1 completion Date: Tue, 3 Jul 2007 09:07:46 -0800 Message-ID: <000001c7bd94$ad8c48d0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C7BD51.9F6DC3C0" 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 V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C7BD51.9F6DC3C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The only thing I can recall that is unique to controller A is the = inlet air temperature sensor. Controller A has a temperature sensor and controller B does not. While it does have some effect on the pulse duration, its effect is normally fairly small compared to the manifold pressure effect. But, I wonder if that has been checked? =20 The very first thing was to check the temp sensor. Resistance measured about right; but replaced it with a fixed 10K resistor - no change. =20 Tracy says I don't necessarily have the most problems; but I get the = prize for the weirdest problems. =20 Likely the unique thing about my electrical system is redundant, = independent power circuits for the EC2, and each set of injectors and coils. The = power sources are isolated with diodes. There may be things about the = internal circuit design that could normally drain noise peaks back to the power = side to dissipate in the battery, so it is possible that; because the diodes don't allow that, it is more susceptible to noise in my setup. I'm not willing to give up the redundancy, and hesitate to replace the isolating diodes with less reliable relays. We have handled the problem in other ways. =20 The RF issue I had (engine flooding during radio transmission) was = tracked to the MAP pressure sender circuit. Adding a capacitor solved that = problem (Tracy has added this change as well). This would likely occur in = composite aircraft. =20 Al ------=_NextPart_000_0001_01C7BD51.9F6DC3C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
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 The only thing I can = recall that is  unique to controller A is the inlet air temperature sensor.  Controller A has a temperature sensor and controller B does not.  = While it does have some effect on the pulse duration, its effect is normally = fairly small compared to the manifold pressure effect.  But, I wonder if = that has been checked? 

The very first thing was to check = the temp sensor.  Resistance measured about right; but replaced it with = a fixed 10K resistor – no change.

 

Tracy says I don’t necessarily have the most problems; but = I get the prize for the weirdest problems.

 

Likely the unique thing about my electrical system is redundant, independent power circuits for the EC2, = and each set of injectors and coils.  The power sources are isolated with diodes.  There may be things about the internal circuit design that = could normally drain noise peaks back to the power side to dissipate in the = battery, so it is possible that; because the diodes don’t allow that, it is = more susceptible to noise in my setup.  I’m not willing to give up = the redundancy, and hesitate to replace the isolating diodes with less = reliable relays.  We have handled the problem in other = ways.

 

The RF issue I had (engine = flooding during radio transmission) was tracked to the MAP pressure sender circuit. = Adding a capacitor solved that problem (Tracy has added this change as well).  This would likely = occur in composite aircraft.

 

Al

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