Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 362155 for flyrotary@lancaironline.net; Thu, 12 Aug 2004 08:08:51 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i7CC8GNs015585 for ; Thu, 12 Aug 2004 08:08:17 -0400 (EDT) Message-ID: <001701c48065$0da054c0$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Pressure switch Date: Thu, 12 Aug 2004 08:08:17 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C48043.865C8130" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C48043.865C8130 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageFirst 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. =20 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 -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 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. =20 Rusty (Maaaaaaaayby running Rev-3 by Sunday) ------=_NextPart_000_0014_01C48043.865C8130 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
First time I encountered this was = several years ago=20 when flying with Tracy.  I normally do no descend faster than = 1000-1500 FPM=20 but when Tracy decides a open patch is the route for descent - he goes=20 down!  So following him with my VSI pegged at 2000 fpm down I = became=20 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
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 times=20 in the pattern when I was descending at idle, and the engine noise = seemed to=20 almost go away.  Opening the throttle some made it start, then = going to=20 idle stop.  I got the distinct feeling that the engine was not = running at=20 idle, just like a car cuts the fuel on deceleration.  = Interesting. =20

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


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