X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1022382 for flyrotary@lancaironline.net; Sun, 26 Jun 2005 17:19:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j5QLIRL5028657 for ; Sun, 26 Jun 2005 17:18:29 -0400 (EDT) Message-ID: <000701c57a94$9cabcb20$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Coolant Leak Date: Sun, 26 Jun 2005 17:18:34 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C57A73.155C37C0" 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C57A73.155C37C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 The important thing is that; whatever the cause, the pressure transient = is apparently a non-issue. Certainly lines covered with braided SS = aren't going to expand much, but they still have flexible walls in there = that do distort bit with pressure, as will the thin-walled tank on a = radiator. Clearly there is a hydraulic pressure being transmitted = through the cooling system. My guess is that the cause is likely the = immediate expansion of the inside walls of the rotor housing = (temperature and pressure) while everything else is cool, followed = closely thereafter by initial heating of the coolant. Heat transfer = through the rotor housing does not happen instantaneously. It's a = guess, but hey; other than for mental gymnastics, who cares? Al I agree, Al, inquiring minds at least like a plausible hypothesis and I = think the discussion has led to that. Perhaps I'll leave the "cup" of = air, just for peace of mind {:>)=20 Ed ------=_NextPart_000_0004_01C57A73.155C37C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The important thing is = that; whatever=20 the cause, the pressure transient is apparently a = non-issue. =20 Certainly lines covered with braided SS aren=92t going to expand much, = but they=20 still have flexible walls in there that do distort bit with pressure, as = will=20 the thin-walled tank on a radiator. Clearly there is a hydraulic = pressure=20 being transmitted through the cooling system. My guess is that the = cause=20 is likely the immediate expansion of the inside walls of the rotor = housing=20 (temperature and pressure) while everything else is cool, followed = closely=20 thereafter by initial heating of the coolant. Heat transfer = through the=20 rotor housing does not happen instantaneously. It=92s a guess, but = hey;=20 other than for mental gymnastics, who = cares?

Al

I=20 agree, Al, inquiring minds at least like a plausible hypothesis and I = think the=20 discussion has led to that. Perhaps I'll leave the "cup" of air, = just for=20 peace of mind {:>)

Ed ------=_NextPart_000_0004_01C57A73.155C37C0--