X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp104.plus.mail.re2.yahoo.com ([206.190.53.29] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with SMTP id 1239712 for flyrotary@lancaironline.net; Mon, 17 Jul 2006 07:42:43 -0400 Received-SPF: none receiver=logan.com; client-ip=206.190.53.29; envelope-from=prvt_pilot@yahoo.com Received: (qmail 5965 invoked from network); 17 Jul 2006 11:41:30 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Received:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:In-Reply-To:X-MimeOLE:Importance; b=qjVdNT98AMg5SaeEQKKzCKzJYZZ+52lrDSAT3bHBkQr2Hvze8QX2QGIRwgkaDK18VaQxfD2hb3fxz1az4hhhinGOrj9w6hJonUnODDSLmHH6nNexDkzs+wZ9RiL7cf82zkxieuJ4xaCosZLCM/xTRSDjgl6brEmwgsxWrug+ijE= ; Received: from unknown (HELO stevehome) (prvt?pilot@71.55.75.37 with login) by smtp104.plus.mail.re2.yahoo.com with SMTP; 17 Jul 2006 11:41:30 -0000 From: "Steve Brooks" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Cooling coupling Date: Mon, 17 Jul 2006 07:41:36 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_005D_01C6A974.6ED6A8E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1807 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_005D_01C6A974.6ED6A8E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Al, I' also suspect that there is heat/cooling transfer from the oil and coolant. When I taxi, and also during climb out, my oil temperature always lags behind the coolant by 10 degrees or so. In cruise, after just a few minutes, my coolant and oil both settle in to the same temperature. Steve Brooks -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen Sent: Sunday, July 16, 2006 5:38 PM To: Rotary motors in aircraft Subject: [FlyRotary] Cooling coupling I'm curious how much thermal 'coupling' there is between the oil and water cooling in the engine; and whether it is more one way than the other. IOW; if I could lower the coolant temp by 20 degrees, how much effect would that have on the oil temp, if any; and vice versa. I'm thinking about this regarding cooling on the ground, and if I'm going to work on reducing one or the other, which might have the greater benefit. As it is now, the oil gets to 220F about the time the coolant gets to 210F. Options under consideration are a fan behind the coolant rad; and a water spray setup for the oil cooler. Al ------=_NextPart_000_005D_01C6A974.6ED6A8E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al,

I'=20 also suspect that there is heat/cooling transfer from the oil and = coolant. =20 When I taxi, and also during climb out, my oil temperature always lags = behind=20 the coolant by 10 degrees or so. In cruise, after just a few = minutes, my=20 coolant and oil both settle in to the same = temperature.

Steve=20 Brooks

-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Al=20 Gietzen
Sent: Sunday, July 16, 2006 5:38 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Cooling=20 coupling

I’m curious how = much thermal=20 ‘coupling’ there is between the oil and water cooling in = the engine; and=20 whether it is more one way than the other. IOW; if I could lower = the=20 coolant temp by 20 degrees, how much effect would that have on the oil = temp,=20 if any; and vice versa.

I’m thinking = about this=20 regarding cooling on the ground, and if I’m going to work on = reducing one or=20 the other, which might have the greater benefit. As it is now, = the oil=20 gets to 220F about the time the coolant gets to 210F. Options = under=20 consideration are a fan behind the coolant rad; and a water spray = setup for=20 the oil cooler.

Al

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