X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 23 Nov 2011 22:05:32 -0500 Message-ID: X-Original-Return-Path: Received: from nm30-vm4.bullet.mail.ne1.yahoo.com ([98.138.91.190] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with SMTP id 5211121 for lml@lancaironline.net; Wed, 23 Nov 2011 00:12:33 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.91.190; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.56] by nm30.bullet.mail.ne1.yahoo.com with NNFMP; 23 Nov 2011 05:11:58 -0000 Received: from [98.138.89.163] by tm9.bullet.mail.ne1.yahoo.com with NNFMP; 23 Nov 2011 05:11:58 -0000 Received: from [127.0.0.1] by omp1019.mail.ne1.yahoo.com with NNFMP; 23 Nov 2011 05:11:58 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 317318.68813.bm@omp1019.mail.ne1.yahoo.com Received: (qmail 94541 invoked by uid 60001); 23 Nov 2011 05:11:57 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=wunkcsqrLTRkYZERpifhMN5JTgD7dd6z9UJzfr3zcUXy9v3KXDUMVIMKhHNpXNMFvK/NOVgCz2WUZKAQrjhaR3yM3IFSp4Iq4+OCBUhqd3YFCHeJWW4XHs8Hw9E+THbVTfzPPruyMqHesE607a8HOTK0HsYTfEE+Cv33Pc3ZoOc=; X-YMail-OSG: tjXCqxYVM1kCX2PQAgVJjlxs6pGGZLdBqWFt7gTD1O3nnsf xUwrQ1zeM.4Qiy7dmzFEGGTQbqoEqUvK1wX2Wxi4QeOmdpb_EdxP9OPgiQhf CR6GBbBOWxIFqmeqqmx_Kpkwslc.0nbBjL3p06y7qeOvDF_FGQsBNV_PfiXU jPH0DcBJEwlXDdCULuGz19tg4bhHn7_Mjuk1INeWZ8fIXNNUKJ4zQExAKv5s .sh6tIXxMHcTWBJetrHgPgtZOr6eGDFb1L.RHJIskWIFEktwXti9gike3RJM P5qGOEJ.dKxgQpRz.sTbjNx.leqD0zNzcDZr5C4hjc6tv4AGo1Scw0Hal6Ad 3zwQ.2kOfFyDhQU40BsrHvlrBKKLQu39M8Ms9Mk7Bg3OowO89wqt0oug51nI WLsM9a9shXCj6YEhzbZ6F4bpH9a27b_MD58YYzOBrr1451UW.jqU4QEaU0nJ iFC3hFrJzxuej4.4whZ5PYEIAvJaVAb_Kbo8CYzGlWKjWtaXSJ4B82O74OIt 4zcSHVjlhY4ZpOIJ5eucwuw.IrRSk Received: from [99.137.192.233] by web36903.mail.mud.yahoo.com via HTTP; Tue, 22 Nov 2011 21:11:57 PST X-Mailer: YahooMailWebService/0.8.115.325013 References: X-Original-Message-ID: <1322025117.58030.YahooMailNeo@web36903.mail.mud.yahoo.com> X-Original-Date: Tue, 22 Nov 2011 21:11:57 -0800 (PST) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: OAT Location X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-2114655128-2123611915-1322025117=:58030" ---2114655128-2123611915-1322025117=:58030 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable =0A=0A=0AOn a recent round trip flight, I mounted a few extra thermocouples= to see how far off the air vent location really is.=A0 I have a 360 with t= he primary OAT probe in the passenger side vent.=A0 I have been curious as = to possible error, but didn't give it much thought until the recent discuss= ion.=0AI mounted a=A0comparison probe between=A0the rear wing spar and the = flap about a foot out from the fuselage.=0AThe results in steady state crui= se showed the vent location to be 4 degrees warmer.=A0 This was independent= of altitude, as well as, vent position, open vs. closed.=A0 There was a no= ticeable lag in the temperature reading out on the wing during altitude cha= nges.=A0 In climb the temperature delta would get smaller, down to one or t= wo degrees.=A0 In decent, the lag would produce a larger delta, as high as = seven degrees.=0AFWIW, your mileage may vary.=0A=A0=0AChris Zavatson=0AN91C= Z=0A360std=0Awww.N91CZ.net ---2114655128-2123611915-1322025117=:58030 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable


On a recent round trip flight, I mounted a few extra thermocoupl= es to see how far off the air vent location really is.  I have a 360 w= ith the primary OAT probe in the passenger side vent.  I have been cur= ious as to possible error, but didn't give it much thought until the recent= discussion.
I mounted a comparison probe between the rear wing spa= r and the flap about a foot out from the fuselage.
The results in steady state cruise showed the vent location to b= e 4 degrees warmer.  This was independent of altitude, as well as, ven= t position, open vs. closed.  There was a = noticeable lag in the temperature reading out on the wing dur= ing altitude changes.  In climb the temperature delta would get smalle= r, down to one or two degrees.  In decent, the lag would produce a lar= ger delta, as high as seven degrees.
FWIW, your mileage may= vary.
 
Chris Zavatson
N91CZ
360std
 


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