X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes28.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1022592 for flyrotary@lancaironline.net; Sun, 26 Jun 2005 21:48:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.26.34]) by priv-edtnes28.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20050627014726.SOFG7254.priv-edtnes28.telusplanet.net@boucher-oddle24> for ; Sun, 26 Jun 2005 19:47:26 -0600 MIME-Version: 1.0 Message-Id: <42BF5AA8.00000B.01992@BOUCHER-ODDLE24> Date: Sun, 26 Jun 2005 18:47:20 -0700 (Pacific Standard Time) Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_WMZPCJD0000000000000" X-Mailer: IncrediMail (3001609) From: "Echo Lake Fishing Resort (Georges Boucher)" References: To: Subject: Re: [FlyRotary] Re: Coolant Leak X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 --------------Boundary-00=_WMZPCJD0000000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'm sure this isn't news to the group, but that "cup" of air must be (preferably in an expantion bottle) at the highest point in the system.=0D Georges B.=0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 06/26/05 14:19:17=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: Coolant Leak=0D =0D =0D The important thing is that; whatever the cause, the pressure transient i= s apparently a non-issue. Certainly lines covered with braided SS aren=92= 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.=20 Clearly there is a hydraulic pressure being transmitted through the cooli= ng 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 o= f the coolant. Heat transfer through the rotor housing does not happen instantaneously. It=92s a guess, but hey; other than for mental gymnasti= cs, who cares?=0D =0D Al=0D =0D =0D 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 ai= r, just for peace of mind {:>) =0D =0D Ed =0D =20 --------------Boundary-00=_WMZPCJD0000000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 I'm sure this isn't news to the group, but that "cup" of air m= ust be (preferably in an expantion bottle) at the highest point in the sy= stem.
Georges B.
 
-------Original Message-------
 
Date: 06/26/05 14:= 19:17
Subject: [FlyRotar= y] Re: Coolant Leak
 
 
The i= mportant thing is that; whatever the cause, the pressure transient is app= arently a non-issue.    Certainly lines covered with braid= ed SS aren=92t going to expand much, but they still have flexible walls i= n there that do distort bit with pressure, as will the thin-walled tank o= n a radiator.  Clearly there is a hydraulic pressure being transmitt= ed through the cooling system.  My guess is that the cause is likely= the immediate expansion of the inside walls of the rotor housing (temper= ature and pressure) while everything else is cool, followed closely there= after by initial heating of the coolant.  Heat transfer through the = rotor housing does not happen instantaneously.  It=92s a guess, but = hey; other than for mental gymnastics, who cares?

Al

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

Ed=20
 
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