Return-Path: Received: from BAY0-SMTP08.adinternal.hotmail.com ([65.54.241.115] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3069124 for flyrotary@lancaironline.net; Mon, 08 Mar 2004 12:24:45 -0500 X-Originating-IP: [4.76.38.174] X-Originating-Email: [lonnwood@msn.com] Received: from a9t2u1 ([4.76.38.174]) by BAY0-SMTP08.adinternal.hotmail.com with Microsoft SMTPSVC(5.0.2195.5600); Mon, 8 Mar 2004 09:24:39 -0800 Message-ID: <005c01c40534$4bc73040$ae264c04@a9t2u1> From: "lonnwood" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Cooling System Dynamics Date: Mon, 8 Mar 2004 09:39:22 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0059_01C404F1.3C869960" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Return-Path: lonnwood@msn.com X-OriginalArrivalTime: 08 Mar 2004 17:24:39.0783 (UTC) FILETIME=[3CAF1F70:01C40532] This is a multi-part message in MIME format. ------=_NextPart_000_0059_01C404F1.3C869960 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable That sounds like a simple way of doing it Jim, no processor required. Would probably be wise to make temp cut in and pressure settings adjustable to fine tune to your engine. Lonnie ----- Original Message -----=20 From: Jim Sower=20 To: Rotary motors in aircraft=20 Sent: Sunday, March 07, 2004 12:23 PM Subject: [FlyRotary] Re: Cooling System Dynamics I would guess there's a temperature threshold somewhat below operating = temp at which the pressure is pretty close to operating pressure. If = that is so:=20 Have the temperature, as it rises above that threshold enable the = pressure alarm which would activate when pressure dropped.=20 Overpressures (like firing into the water jacket) would activate the = pressure alarm regardless of temperature.=20 Just a theory .... Jim S.=20 lonnwood wrote:=20 Tracy, this has got me to thinking about an alarm system that would = be useful for the coolant pressure gauge.A simple pressure activated = warning light would not be useful because the pressure starts out at = zero andgradually builds, then during different modes of flight when = your engine cools the pressure would go back down.Not having flown with = a water cooled system yet I don't know how much it would fluctuate.Would = it be worthwhile to have a small processor programmed to keep track of = engine temps and comparethose to what the coolant pressure should be, = then set the alarm off if they don't add up?Lonnie=20 The best advice I can give is to learn the behavior (not just the = static reading) of your coolant pressure gauge and pay attention to any = anomaly. It tells the whole story IF you know how to interpret it. = Tracy Crook ------=_NextPart_000_0059_01C404F1.3C869960 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
That sounds like a simple way of doing it Jim, = no=20 processor
required. Would probably be wise to make temp = cut in=20 and
pressure settings adjustable to fine tune to = your=20 engine.
Lonnie
----- Original Message -----
From:=20 Jim=20 Sower
Sent: Sunday, March 07, 2004 = 12:23=20 PM
Subject: [FlyRotary] Re: = Cooling System=20 Dynamics

I would guess there's a temperature threshold somewhat = below=20 operating temp at which the pressure is pretty close to operating=20 pressure.  If that is so:
Have the temperature, as it rises = above=20 that threshold enable the pressure alarm which would activate when = pressure=20 dropped.
Overpressures (like firing into the water jacket) would = activate=20 the pressure alarm regardless of temperature.=20

Just a theory .... Jim S.=20

lonnwood wrote:=20

Tracy, this has got me to thinking about an alarm = system=20 that would be useful for the coolant pressure gauge.A simple pressure activated warning light would not be = useful=20 because the pressure starts out at zero andgradually=20 builds, then during different modes of flight when your engine cools = the=20 pressure would go back down.Not having = flown with a=20 water cooled system yet I don't know how much it would=20 fluctuate.Would it be worthwhile to have a = small=20 processor programmed to keep track of engine temps and = comparethose to what the coolant pressure should be, then set = the alarm=20 off if they don't add up?Lonnie=20
The=20 best advice I can give is to learn the behavior (not just the = static=20 reading) of your coolant pressure gauge and pay attention to any=20 anomaly.  It tells the whole story IF you know how to = interpret=20 it. Tracy = Crook
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