X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 09 Dec 2007 16:46:33 -0500 Message-ID: X-Original-Return-Path: Received: from bay0-omc2-s40.bay0.hotmail.com ([65.54.246.176] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2571640 for lml@lancaironline.net; Fri, 07 Dec 2007 19:20:44 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.176; envelope-from=joscales98@hotmail.com Received: from hotmail.com ([65.55.135.16]) by bay0-omc2-s40.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 7 Dec 2007 16:20:05 -0800 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 7 Dec 2007 16:20:05 -0800 X-Original-Message-ID: Received: from 75.81.226.134 by BAY130-DAV6.phx.gbl with DAV; Sat, 08 Dec 2007 00:20:03 +0000 X-Originating-IP: [75.81.226.134] X-Originating-Email: [joscales98@hotmail.com] X-Sender: joscales98@hotmail.com From: "Jim Scales" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Computing TAS from GPS tracks X-Original-Date: Fri, 7 Dec 2007 18:20:04 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01C838FD.C9E99930" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.50.0039.1900 Seal-Send-Time: Fri, 7 Dec 2007 18:20:04 -0600 X-OriginalArrivalTime: 08 Dec 2007 00:20:05.0668 (UTC) FILETIME=[152F1640:01C83930] X-Original-Return-Path: joscales98@hotmail.com This is a multi-part message in MIME format. ------=_NextPart_000_0036_01C838FD.C9E99930 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable http://www.reacomp.com/true_airspeed/ ----- Original Message -----=20 From: Michael Newman=20 To: lml@lancaironline.net=20 Sent: Friday, December 07, 2007 6:13 PM Subject: [LML] Computing TAS from GPS tracks I've been doing some homework on how to calibrate airspeed indications = and get the TAS of a plane. Given 3 GPS tracks taken at the same = airspeed you can compute a complete solution for the heading on each = track and the TAS. Folks might be interested in my spreadsheet which contains real data = from my plane at low altitude. I will gather some more data over time. You can find my spreadsheet via my Soaring and Flying page at: = http://www.dragonnorth.com/soaring.html scroll down a bit there is discussion a link to a reference = document and a link to the spreadsheet itself. My true airspeed as computed from my airspeed indicator is about 14 = knots faster that the measured result. -------------------------------------------------------------------------= ----- Michael Newman Dragonnorth Group =20 319 Dean Rd. Brookline, MA 02445 Cell: 617 821-4608 Home: 617 566-7975 Fax: 617 566-7975 =20 www.dragonnorth.com mnewman@dragonnorth.com =20 ------=_NextPart_000_0036_01C838FD.C9E99930 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
----- Original Message -----
From: Michael Newman
Sent: Friday, December 07, 2007 = 6:13=20 PM
Subject: [LML] Computing TAS = from GPS=20 tracks

I've been doing some = homework on how to=20 calibrate airspeed indications and get the TAS of a plane. Given 3 GPS = tracks=20 taken at the same airspeed you can compute a complete solution for the = heading=20 on each track and the TAS.
 
Folks might be interested = in my spreadsheet which contains real = data from=20 my plane at low altitude. I will gather some more data over=20 time.
 
You can=20 find my spreadsheet via my Soaring and Flying page at: http://www.dragonnorth.c= om/soaring.html scroll=20 down a bit there is discussion a link to a reference document and a = link to=20 the spreadsheet itself.
 
My true=20 airspeed as computed from my airspeed indicator is about 14 knots = faster that=20 the measured result.
 
=

Michael Newman

Dragonnorth=20 Group

319 Dean Rd.
Brookline, MA = 02445

Cell: 617=20 821-4608
Home: 617 566-7975
Fax: 617 = 566-7975

www.dragonnorth.com

mnewman@dragonnorth.com

 
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