X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1022084 for flyrotary@lancaironline.net; Sun, 26 Jun 2005 11:39:20 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; 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-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j5QFcXl9015310 for ; Sun, 26 Jun 2005 11:38:34 -0400 (EDT) Message-ID: <000701c57a65$1fff2e70$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Coolant Leak Date: Sun, 26 Jun 2005 11:38:39 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C57A43.98B1E500" 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_01C57A43.98B1E500 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I agree, Al. I don't see how that much heating of the coolant could = happen in a second or two. I personally think it has to do with lack of = any air in the system as it does not do that when there is air present. = Could the fact that I used stainless steel braided lines for the coolant = system minimize expansion? In any case, I have flow with that condition = for several hundred hours with no apparent ill effect, so it does not = appear to be anything detrimental to the operation of the engine. Ed ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Sunday, June 26, 2005 11:13 AM Subject: [FlyRotary] Re: Coolant Leak Al, all I can tell you is that the pressure would go immediately = (within 2 seconds) to 21-24 psi. Then as the engine warmed up the = pressure would drop to a nominal 8 psi or so 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 the cap (even just a little coolant), it must reach the pressure = rating of the cap.=20 How much can the 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 = pressure from increasing that much. There is some weird science in here = somewhere. Al ------=_NextPart_000_0004_01C57A43.98B1E500 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I agree, Al.  I don't see how that much = heating of=20 the coolant could happen in a second or two.  I personally think it = has to=20 do with lack of any air in the system as it does not do that when there = is air=20 present.  Could the fact that I used stainless steel braided lines = for the=20 coolant system minimize expansion?  In any case, I have flow with = that=20 condition for several hundred hours with no apparent ill effect, so it = does not=20 appear to be anything detrimental to the operation of the = engine.
 
Ed
 
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Sunday, June 26, 2005 = 11:13=20 AM
Subject: [FlyRotary] Re: = Coolant=20 Leak

 Al, all I can tell = you is=20 that the pressure would go immediately (within   2 seconds) = to 21-24=20 psi.  Then as the engine warmed up the pressure would drop to a = nominal 8=20 psi or so

 

It makes sense to me = Ed.  Heat the=20 coolant just a little, and it needs to expand just a little.  In = order=20 for any of the coolant to flow out past the cap (even just a little = coolant),=20 it must reach the pressure rating of the cap.

 

How much = can the=20 coolant heat up in 2 seconds after start?  Just about zero.  = The=20 only thing that is heated a little in that time is the rotor housing = walls.=20 Maybe that reduces coolant volume.  In any case, if you have any = radiator=20 hose in the system, it will expand enough to keep the pressure from = increasing=20 that much.  There is some weird science in here=20 somewhere.

 

Al

------=_NextPart_000_0004_01C57A43.98B1E500--