X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.224] (HELO priv-edtnes40.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1022111 for flyrotary@lancaironline.net; Sun, 26 Jun 2005 12:19:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.224; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.127.16]) by priv-edtnes40.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20050626161810.GYGI11777.priv-edtnes40.telusplanet.net@boucher-oddle24> for ; Sun, 26 Jun 2005 10:18:10 -0600 MIME-Version: 1.0 Message-Id: <42BED53D.000001.03760@BOUCHER-ODDLE24> Date: Sun, 26 Jun 2005 09:18:05 -0700 (Pacific Standard Time) Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_5A9PQL80000000000000" 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=_5A9PQL80000000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I agree with Al on this one, FWIW here is another theory. The coolant passages in the 13b are very small, assuming the pressure pick up is clos= e to the pump outlet the pressure will build up until all the coolant flows completely through the system & back to the water pump. Not having enough air space in the coolant expiation accentuates the pressure.=0D Georges B.=0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 06/26/05 08:14:37=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: Coolant Leak=0D =0D Al, all I can tell you is that the pressure would go immediately (within= =20 2 seconds) to 21-24 psi. Then as the engine warmed up the pressure would drop to a nominal 8 psi or so=0D =0D It makes sense to me Ed. Heat the coolant just a little, and it needs to expand just a little. In order for any of the coolant to flow out past t= he cap (even just a little coolant), it must reach the pressure rating of th= e cap. =0D =0D How much can the coolant heat up in 2 seconds after start? Just about ze= ro. The only thing that is heated a little in that time is the rotor housing walls. Maybe that reduces coolant volume. In any case, if you have any radiator hose in the system, it will expand enough to keep the pressure f= rom increasing that much. There is some weird science in here somewhere.=0D =0D Al=0D =20 --------------Boundary-00=_5A9PQL80000000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I agree with Al on this one, FWIW here is another theory. =  The coolant passages in the 13b are very small, assuming the pressu= re pick up is close to the pump outlet the pressure will build up until a= ll the coolant flows completely through the system & back to the wate= r pump. Not having enough air space in the coolant expiation accentuates = the pressure.
Georges B.
 
-------Original Message-------
 
Date: 06/26/05 08:= 14:37
Subject: [FlyRotar= y] Re: Coolant Leak
 

 Al, all= I can tell you is that the pressure would go immediately (within  &= nbsp;2 seconds) to 21-24 psi.  Then as the engine warmed up the pres= sure would drop to a nominal 8 psi or so

 <= /P>

It makes sense to me = Ed.  Heat the coolant just a little, and it needs to expand just a l= ittle.  In order for any of the coolant to flow out past the cap (ev= en just a little coolant), it must reach the pressure rating of the cap. =

 <= /P>

How much can th= e coolant heat up in 2 seconds after start?  Just about zero.  = The only thing that is heated a little in that time is the rotor housing = walls. Maybe that reduces coolant volume.  In any case, if you have = any radiator hose in the system, it will expand enough to keep the pressu= re from increasing that much.  There is some weird science in here s= omewhere.

 

Al

 
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