Return-Path: Received: from [65.54.169.56] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 756353 for flyrotary@lancaironline.net; Wed, 23 Feb 2005 14:13:48 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.56; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 23 Feb 2005 11:13:00 -0800 Message-ID: Received: from 4.174.3.130 by BAY3-DAV26.phx.gbl with DAV; Wed, 23 Feb 2005 19:12:53 +0000 X-Originating-IP: [4.174.3.130] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Vapor Lock Date: Wed, 23 Feb 2005 14:12:53 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0173_01C519B1.C41BF700" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Wed, 23 Feb 2005 14:12:54 -0500 X-OriginalArrivalTime: 23 Feb 2005 19:13:00.0928 (UTC) FILETIME=[B1132000:01C519DB] This is a multi-part message in MIME format. ------=_NextPart_000_0173_01C519B1.C41BF700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: Vapor LockPaul, one last thought on the vapor lock = thing. Very glad you have found that it was the problem. There is = nothing worse than not knowing.=20 It is quite possible that changing EITHER of the two variables (in-line = Facet or vent on the header/sump tank) will make the system work. Just = because you remove one and it works does not mean you have found the = root cause. Earlier I used the "strikes" analogy, and we don't know how = many of these it takes to make an "out". From your background I'm sure you know that it is frequently a = combination of things that can cause a failure. Removing one of them = may 'fix' the problem now but add in other variables like fuel vapor = pressure, altitude, etc, and the problem could come back. The goal is = to make the system as tolerant of all factors as possible. Happily, = this frequently means making it simple too! One other thought on simplicity. I have never landed without power (in = my rotary powered plane) but I have come close several times in the = early days. The only thing that prevented it was having a fairly simple = system and knowing it very well. This helped diagnose the problem and = fix or compensate for it before running out of altitude and ideas. Tracy ------=_NextPart_000_0173_01C519B1.C41BF700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: Vapor Lock
Paul, one last thought on the vapor lock thing.  Very = glad you=20 have found that it was the problem.  There is nothing worse than = not=20 knowing. 
 
It is quite possible that changing EITHER of the two variables = (in-line=20 Facet or vent on the header/sump tank) will make the system work.  = Just=20 because you remove one and it works does not mean you have = found the=20 root cause.  Earlier I used the "strikes" analogy, and we don't = know how=20 many of these it takes to make an "out".
 
  From your background I'm sure you know that it is frequently = a=20 combination of things that can cause a failure.  Removing one of = them may=20 'fix' the problem now but add in other variables like fuel vapor = pressure,=20 altitude, etc, and the problem could come back.  The = goal=20 is to make the system as tolerant of all factors as possible.  = Happily, this frequently means making it simple too!
 
One other thought on simplicity.  I have never landed without = power=20 (in my rotary powered plane) but I have come close several times in the = early=20 days.  The only thing that prevented it was having a fairly simple = system=20 and knowing it very well.  This helped diagnose the problem and fix = or=20 compensate for it before running out of altitude and ideas.
 
Tracy
------=_NextPart_000_0173_01C519B1.C41BF700--