X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 27 Apr 2006 01:30:01 -0400 Message-ID: X-Original-Return-Path: Received: from smtp105.sbc.mail.mud.yahoo.com ([68.142.198.204] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with SMTP id 1082405 for lml@lancaironline.net; Wed, 26 Apr 2006 19:52:37 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.198.204; envelope-from=elippse@sbcglobal.net Received: (qmail 97407 invoked from network); 26 Apr 2006 23:51:54 -0000 Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@71.157.179.11 with login) by smtp105.sbc.mail.mud.yahoo.com with SMTP; 26 Apr 2006 23:51:54 -0000 X-Original-Message-ID: <000501c6698c$6a39d230$0bb39d47@Computerroom> From: "Paul Lipps" X-Original-To: "Marv Kaye" Subject: skin heating X-Original-Date: Wed, 26 Apr 2006 16:52:01 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0002_01C66951.BD5A3170" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0002_01C66951.BD5A3170 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, Frederick! 'Sorry I referred to you as Frank in the previous two postings! I = have one OAT mounted behind the rear wing spar ahead of my flap for my = Rocky Mountain u-monitor, and one in the tailcone above and behind the = elevator spar cutout for my Dynon EFIS. Both of them agree within 1 = degree C of each other in flight, and they also agree with the forecast = temperature. One way to determine if you are getting stagnation rise, = which I have done, is to fly slowly, say 100 mph, and record the OAT, = then get up to cruise speed and see what the OAT says. I've done some = data processing with downloads from some of the raceplanes and am = astounded by how badly their avionics/OAT locations gives density = altitude variations with airspeed changes, even though baro altitude = stays the same. Klaus has his OAT flush on the skin of his EZ. In a = side-by-side comparison, as we got up to speed, his corrected OAT and = dalt showed a drop, since his instrument used the 80% stagnation rise = estimate and his wasn't that great. My OAT never changed. ------=_NextPart_000_0002_01C66951.BD5A3170 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi, Frederick!
    'Sorry I referred to you as = Frank in=20 the previous two postings! I have one OAT mounted behind the rear wing = spar=20 ahead of my flap for my Rocky Mountain u-monitor, and one in the = tailcone above=20 and behind the elevator spar cutout for my Dynon EFIS. Both of them = agree within=20 1 degree C of each other in flight, and they also agree with the = forecast=20 temperature. One way to determine if you are getting stagnation rise, = which I=20 have done, is to fly slowly, say 100 mph, and record the OAT, then = get up=20 to cruise speed and see what the OAT says. I've done some data = processing with=20 downloads from some of the raceplanes and am astounded by how badly = their=20 avionics/OAT locations gives density altitude variations with airspeed = changes,=20 even though baro altitude stays the same. Klaus has his OAT flush on the = skin of=20 his EZ. In a side-by-side comparison, as we got up to speed, his = corrected OAT=20 and dalt showed a drop, since his instrument used the 80% stagnation = rise=20 estimate and his wasn't that great. My OAT never=20 changed.
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