Return-Path: Received: from fed1rmmtao08.cox.net ([68.230.241.31] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 362489 for flyrotary@lancaironline.net; Thu, 12 Aug 2004 11:40:40 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.31; envelope-from=daveleonard@cox.net Received: from davidandanne ([68.111.224.107]) by fed1rmmtao08.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with SMTP id <20040812154009.RUMK17968.fed1rmmtao08.cox.net@davidandanne> for ; Thu, 12 Aug 2004 11:40:09 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Pressure switch Date: Thu, 12 Aug 2004 08:40:14 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0032_01C48047.FCBB1950" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0032_01C48047.FCBB1950 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit MessageWell, its very reassuring that I'm not the only one. Dave Leonard First time I encountered this was several years ago when flying with Tracy. I normally do no descend faster than 1000-1500 FPM but when Tracy decides a open patch is the route for descent - he goes down! So following him with my VSI pegged at 2000 fpm down I became alarmed as my engine started to run rough and seem to be missing. Tracy then explained the reason - which reassured me - a bit, but I still did not care for it. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message ----- From: Russell Duffy To: Rotary motors in aircraft Sent: Wednesday, August 11, 2004 8:58 PM Subject: [FlyRotary] Re: Pressure switch 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_0032_01C48047.FCBB1950 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Well, its very reassuring that I'm not the = only=20 one.
 
Dave=20 Leonard 
First time I encountered this was = several years=20 ago when flying with Tracy.  I normally do no descend faster than = 1000-1500 FPM but when Tracy decides a open patch is the route for = descent -=20 he goes down!  So following him with my VSI pegged at 2000 fpm = down I=20 became alarmed as my engine started to run rough and seem to be = missing. =20
 
Tracy then explained the reason - = which reassured=20 me  - a bit, but I still did not care for it.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Russell=20 Duffy
To: Rotary motors in = aircraft=20
Sent: Wednesday, August 11, = 2004 8:58=20 PM
Subject: [FlyRotary] Re: = Pressure=20 switch

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

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

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


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