X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 Nov 2011 23:11:34 -0500 Message-ID: X-Original-Return-Path: Received: from nm1.bullet.mail.ac4.yahoo.com ([98.139.52.198] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with SMTP id 5214484 for lml@lancaironline.net; Fri, 25 Nov 2011 21:47:01 -0500 Received-SPF: none receiver=logan.com; client-ip=98.139.52.198; envelope-from=randylsnarr@yahoo.com Received: from [98.139.52.194] by nm1.bullet.mail.ac4.yahoo.com with NNFMP; 26 Nov 2011 02:46:25 -0000 Received: from [98.139.52.170] by tm7.bullet.mail.ac4.yahoo.com with NNFMP; 26 Nov 2011 02:46:25 -0000 Received: from [127.0.0.1] by omp1053.mail.ac4.yahoo.com with NNFMP; 26 Nov 2011 02:46:25 -0000 X-Yahoo-Newman-Id: 303891.45902.bm@omp1053.mail.ac4.yahoo.com Received: (qmail 5038 invoked from network); 26 Nov 2011 02:46:25 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Subject:References:From:Content-Type:X-Mailer:In-Reply-To:Message-Id:Date:To:Content-Transfer-Encoding:Mime-Version; b=YPP5MTOgUbrHk7z1+Dy1qCY/7fE99vux/hH93PHIHReNXlmHnskvQBiHoyQY9ABq4vzaE8PO5oG4b+WYU5TBuUGXm6U+nLKR0Rnt9hVqEcJDUTNgOBgsGaHT4c6w3zywoH/zh0yBSG5ibpmcLdYakHADgI/x+dZ2VhHvQENIgsg= ; X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: tO6weR8VM1lVNa8b6MkPbJUREmlbUFOzkRBQ4q3aqVWmwaV bUYezBTsU4E180oodRle2C4c1OeiRWpyideXxH0zbRjPgovLpZnQXLyPDD12 5ikccxs0OI5x5ZKMV1wa8DZakzkFG5Hsi4vjyyt92qcJzDXdj1fu3R..EvEV GQK4VG_2o_nVIxcEJnYgaAy.KOtBYNHNntUNdvcxjr_ss2x5GyDTLQm2NEG2 V3hdVIAsHxuHsG5ec2hx9zL1XHiwGsreblX.OGKdZycn30h2wvlM1_7Tn6ll DeZxEU4JfycDYPQMRmV2yyWM1anB_NusgjmgZf4ofeHxNnH5SDAfibwQzUDZ xdajcoIDPlc5VM3Qjw9wti9ZBU.JRozZAY9cel9ra.HnAIT4a.4tqw0K.QVC LsJZVtyNED.q60Gcl6BHOxHX4kbGYl19wvYGZvwx2D4WOyfVyc3p5Mtt.Z64 n.hYMv.qKILv6F4DYyAqJbxd8ww-- X-Yahoo-SMTP: tg4YEXeswBAq79ZTs5A79J5zDY9lAVNV Received: from [192.168.1.106] (randylsnarr@76.8.220.20 with xymcookie) by smtp124-mob.biz.mail.ac4.yahoo.com with SMTP; 25 Nov 2011 18:46:24 -0800 PST Subject: Re: [LML] Re: OAT Location References: From: Randy Content-Type: multipart/alternative; boundary=Apple-Mail-37482EB4-09CB-4791-B4E6-8210E0DED17F X-Mailer: iPad Mail (9A334) In-Reply-To: X-Original-Message-Id: <94351287-69DC-4A4F-9DDA-3A1445DC86A7@yahoo.com> X-Original-Date: Fri, 25 Nov 2011 19:46:22 -0700 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-37482EB4-09CB-4791-B4E6-8210E0DED17F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii The main gear well is a perfect place for the probe.=20 Randy Snarr Sent from my iPad On Nov 23, 2011, at 8:05 PM, Chris Zavatson wrote= : >=20 >=20 > On a recent round trip flight, I mounted a few extra thermocouples to see h= ow far off the air vent location really is. I have a 360 with the primary O= AT probe in the passenger side vent. I have been curious as to possible err= or, but didn't give it much thought until the recent discussion. > I mounted a comparison probe between the rear wing spar and the flap about= a foot out from the fuselage. > The results in steady state cruise showed the vent location to be 4 degree= s warmer. This was independent of altitude, as well as, vent position, open= vs. closed. There was a noticeable lag in the temperature reading out on t= he wing during altitude changes. In climb the temperature delta would get s= maller, down to one or two degrees. In decent, the lag would produce a larg= er delta, as high as seven degrees. > FWIW, your mileage may vary. > =20 > Chris Zavatson > N91CZ > 360std > www.N91CZ.net > =20 >=20 >=20 --Apple-Mail-37482EB4-09CB-4791-B4E6-8210E0DED17F Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
The main gear well is a perfect place for the probe. 
Randy Snarr

Sent from my iPad

On Nov 23, 2011, at 8:05 PM, Chris Zavatson <chris_zavatson@yahoo.com> wrote:



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


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