Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 361810 for flyrotary@lancaironline.net; Wed, 11 Aug 2004 21:01:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.69; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040812010015.GVSC1792.imf21aec.mail.bellsouth.net@rd> for ; Wed, 11 Aug 2004 21:00:15 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Pressure switch Date: Wed, 11 Aug 2004 19:58:24 -0500 Message-ID: <004301c48007$7867c710$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0044_01C47FDD.8F91BF10" 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 V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0044_01C47FDD.8F91BF10 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit In fact, I just realized why I run so rough on desent. The MAP is probably getting pulled down below 10" and the pressure probably drops even more making it very lean... hmmm :-) I mentioned this to Tracy one day, and he said (best I understood it) that the engine basically isn't running under these conditions. For one thing, the injector duty cycle is so low that they effectively aren't opening. I've noticed times in the pattern when I was descending at idle, and the engine noise seemed to almost go away. Opening the throttle some made it start, then going to idle stop. I got the distinct feeling that the engine was not running at idle, just like a car cuts the fuel on deceleration. Interesting. Rusty (Maaaaaaaayby running Rev-3 by Sunday) ------=_NextPart_000_0044_01C47FDD.8F91BF10 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

In fact, I just realized why I run so rough on = desent.  The=20 MAP is probably getting pulled down below 10" and the pressure probably = drops=20 even more making it very lean...  hmmm  :-)

I = mentioned this to Tracy=20 one day, and he said (best I understood it) that the engine basically = isn't=20 running under these conditions.  For one thing, the injector duty = cycle is=20 so low that they effectively aren't opening.  I've noticed times in = the=20 pattern when I was descending at idle, and the engine noise seemed to = almost go=20 away.  Opening the throttle some made it start, then going to idle=20 stop.  I got the distinct feeling that the engine was not running = at idle,=20 just like a car cuts the fuel on deceleration.  Interesting. =20

Rusty = (Maaaaaaaayby=20 running Rev-3 by Sunday)


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