Return-Path: Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725858 for flyrotary@lancaironline.net; Sat, 12 Feb 2005 00:30:56 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=sqpilot@bellsouth.net Received: from [209.214.44.154] by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050212053009.JQIF730.imf22aec.mail.bellsouth.net@[209.214.44.154]> for ; Sat, 12 Feb 2005 00:30:09 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [265.8.7]); Fri, 11 Feb 2005 23:30:00 -0600 Message-ID: <006501c510c3$e464b700$9a2cd6d1@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts Date: Fri, 11 Feb 2005 23:29:58 -0600 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-420D94583C52=======" --=======AVGMAIL-420D94583C52======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_0062_01C51091.99ADBE50" ------=_NextPart_000_0062_01C51091.99ADBE50 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi, John....that is a very interesting theory. My tanks were not full, = but I assume that my sump tank is always full, and if more fuel is = returned to my already full sump tank, the fuel should just be pushed = back up what is normally the feed line and into the selected tank. When = the engine is at idle, that is the time that considerably more fuel is = returned to the sump tank. At WOT on takeoff, the engine is consuming = more fuel, so I would assume that less fuel is being returned to the = fuel sump tank, and some fuel is gravity feeding from the main tank to = the sump tank. I may be missing something here. Paul Conner, top = posting this time. It just somehow doesn't feel right to put the answer = before the question.=20 ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Friday, February 11, 2005 8:27 PM Subject: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To = Paul SOme diagnosis thoughts=20 My point was that I (twice) experienced exactly the same symptoms as = you when trying to pump to a full tank.=20 I understood that part....I was just trying to determine how our = plumbing compared, and try to understand what might cause the loss in = performance. Paul Conner=20 OK. I have simply avoided the scenario, but my WAG at the time was = that the returning fuel had nowhere to go (quickly) and this affected = the pump / rail pressure to make the mixture go either overlean or = overrich. Luckily I was at a much better spot than you, and just = descended at idle. I did try a power blip on short final and all I got = was about 2000 rpm and very rough.=20 John -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005 ------=_NextPart_000_0062_01C51091.99ADBE50 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi, John....that is a very interesting=20 theory.  My tanks were not full, but I assume that my sump tank is = always=20 full, and if more fuel is returned to my already full sump tank, the = fuel should=20 just be pushed back up what is normally the feed line and into the = selected=20 tank. When the engine is at idle, that is the time that = considerably more=20 fuel is returned to the sump tank.  At WOT on takeoff, the engine = is=20 consuming more fuel, so I would assume that less fuel is being returned = to the=20 fuel sump tank, and some fuel is gravity feeding from the main tank to = the sump=20 tank.  I may be missing something here.  Paul Conner, top = posting this=20 time. It just somehow doesn't feel right to put the answer before the = question.=20
----- Original Message -----
From:=20 John=20 Slade
Sent: Friday, February 11, 2005 = 8:27=20 PM
Subject: [FlyRotary] Re: More = wild ideas=20 was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts

My point was that I (twice) experienced = exactly the=20 same symptoms as you when trying to pump to a full tank. 
 
I understood that = part....I was=20 just trying to determine how our plumbing compared, and try to = understand what=20 might cause the loss in performance. Paul Conner 
 
OK. I have simply avoided = the scenario,=20 but my WAG at the time was that the returning fuel had nowhere to = go=20 (quickly) and this affected the pump / rail pressure to make the = mixture go=20 either overlean or overrich. Luckily I was at a much better spot than = you, and=20 just descended at idle. I did try a power blip on short final and all = I got=20 was about 2000 rpm and very rough. =
John

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.7 - Release = Date:=20 2/10/2005
------=_NextPart_000_0062_01C51091.99ADBE50-- --=======AVGMAIL-420D94583C52======= Content-Type: text/plain; x-avg=cert; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Content-Description: "AVG certification" No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005 --=======AVGMAIL-420D94583C52=======--