X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao101.cox.net ([68.230.241.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3475107 for flyrotary@lancaironline.net; Tue, 03 Feb 2009 18:06:57 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.45; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao101.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20090203230618.QMUB2948.fed1rmmtao101.cox.net@fed1rmimpo03.cox.net> for ; Tue, 3 Feb 2009 18:06:18 -0500 Received: from BigAl ([72.192.137.74]) by fed1rmimpo03.cox.net with bizsmtp id Bb6G1b00Y1cVYgg04b6Gp6; Tue, 03 Feb 2009 18:06:17 -0500 X-Authority-Analysis: v=1.0 c=1 a=IftKobWOQA8A:10 a=IlQQM7ImXmAA:10 a=7T7nYadpzinePpiZ5L4A:9 a=gdGvPQNpYqAm6DlYlnz0hz7bKF8A:4 a=ziFrdkHw70AA:10 a=yMhMjlubAAAA:8 a=dJcyGkRfY_y4aID71PIA:9 a=1VjjfM7fYcmtDug2Fb0A:7 a=m7ZbN-ALeNIBVesdSJUd0Gy8oekA:4 a=37WNUvjkh6kA:10 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Oil temperature Vs Outside Air Temperature Date: Tue, 3 Feb 2009 15:06:24 -0800 Message-ID: <48918B66D3DA430384CA5A70963C32FF@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C98610.FB002820" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C98610.FB002820 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Does oil temperature measured after the oil cooler directly track OAT? If oil temperature is 200F at OAT=3D0F, will it be 280F at OAT=3D80F? or somewhere in between? Jeff Jeff; =20 Not exactly, but as a first order dependency; yes. For the same = airspeed and engine power level, the delta T between fluids (oil and air) would = be about the same. It does suggest that if you had 200F oil on a 0 degree = day, you'll have a problem on a warm day. =20 Al G ------=_NextPart_000_0006_01C98610.FB002820 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Does oil temperature measured after the oil = cooler directly track OAT?

If oil temperature is 200F at OAT=3D0F, will = it be 280F at OAT=3D80F? or somewhere in between?

Jeff

Jeff;

Not exactly, but as a first order = dependency; yes. For the same airspeed = and engine power level, the delta T between fluids (oil and air) would be about the = same. It does suggest that if you had 200F oil on a 0 degree day, you’ll = have a problem on a warm day.

Al G

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