Return-Path: Received: from [65.54.169.167] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3067682 for flyrotary@lancaironline.net; Sun, 07 Mar 2004 12:28:42 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 7 Mar 2004 09:28:41 -0800 Received: from 64.159.105.65 by bay3-dav137.bay3.hotmail.com with DAV; Sun, 07 Mar 2004 17:28:41 +0000 X-Originating-IP: [64.159.105.65] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Ideal Cooling System Plumbing(wasRe:[FlyRotary]Re:overflow Date: Sun, 7 Mar 2004 12:28:41 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0009_01C4043F.B97D8BC0" Message-ID: X-OriginalArrivalTime: 07 Mar 2004 17:28:41.0838 (UTC) FILETIME=[A28C08E0:01C40469] ------=_NextPart_001_0009_01C4043F.B97D8BC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable > > FIRST the pressure drops precipitously, and THEN the coolant level > > starts to go down ... FINALLY the temps start to rise (provided the > > temp sender is submerged in what water remains). > =20 > Just a brief comment on this part. Coolant level sensors are of =20 > almost no use in this application. It is commonly assumed that the =20 > temp gauge reads low as soon as the sensor is no longer submerged. =20 > Not true. It only drops after the coolant is all boiled away because =20 > steam will heat the sensor. If you haven't caught the problem long =20 > before this, it's too late anyway. =20 > =20 > Tracy Tracy, please expand on this: "Coolant level sensors are of almost no =20 use in this application." Finn Well, I did say 'almost'. See later message on this subject. But for in= stance, the low coolant level warning on my RX-7 is mainly useful only be= fore the engine is started. It will stop complaining after the engine st= arts and runs a bit (especially at high throttle when the coolant is well= whipped up by the pump). When it comes on again, a LOT of coolant is mi= ssing. So, I think as an in-flight warning, it would not be very useful since w= hen it comes on it will be too late. But my main point is that there are= far better ways to detect a cooling system problem early on. Tracy ------=_NextPart_001_0009_01C4043F.B97D8BC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
<= DIV> 
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> >   FIRST the pressure drops precipitously, and= THEN the coolant level
> > starts to go down ... FINALLY the te= mps start to rise (provided the
> > temp sender is submerged in = what water remains).
> 
> Just a brief comment on this = part.  Coolant level sensors are of
> almost no use in this a= pplication.  It is commonly assumed that the
> temp gauge rea= ds low as soon as the sensor is no longer submerged. 
> Not t= rue.  It only drops after the coolant is all boiled away because > steam will heat the sensor.  If you haven't caught the problem= long
> before this, it's too late anyway.
> 
>= Tracy


Tracy, please expand on this: "Coolant level sensors ar= e of almost no
use in this application."

Finn

Well,= I did say 'almost'.  See later message on this subject.  But f= or instance, the low coolant level warning on my RX-7 is mainly useful on= ly before the engine is started.  It will stop complaining after the= engine starts and runs a bit (especially at high throttle when the coola= nt is well whipped up by the pump).  When it comes on again, a = LOT of coolant is missing.

 So, I think as an in-flight warni= ng, it would not be very useful since when it comes on it will be too lat= e.  But my main point is that there are far better ways to detect a = cooling system problem early on.

Tracy

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