X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 07 Dec 2007 19:13:53 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-kukur.atl.sa.earthlink.net ([209.86.89.65] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2571200 for lml@lancaironline.net; Fri, 07 Dec 2007 13:37:24 -0500 Received-SPF: neutral receiver=logan.com; client-ip=209.86.89.65; envelope-from=mnewman@dragonnorth.com Received: from [70.91.142.49] (helo=PCmike2) by elasmtp-kukur.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1J0RyW-0005CR-P7 for lml@lancaironline.net; Thu, 06 Dec 2007 20:25:57 -0500 From: "Michael Newman" X-Original-To: Subject: Computing TAS from GPS tracks X-Original-Date: Thu, 6 Dec 2007 20:26:35 -0500 Organization: Dragonnorth Group X-Original-Message-ID: <202e01c83870$35014f30$0401a8c0@sentira.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_202F_01C83846.4C2B4730" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 thread-index: Acg4cDSGGevt+bnbRlSaEPh4vbgYKA== X-ELNK-Trace: 4981850a937e3365551c28c27865cf0a239a348a220c26099453bc625b1bfabb51f2ab0f66648183a8438e0f32a48e08350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.91.142.49 This is a multi-part message in MIME format. ------=_NextPart_000_202F_01C83846.4C2B4730 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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 319 Dean Rd. Brookline, MA 02445 Cell: 617 821-4608 Home: 617 566-7975 Fax: 617 566-7975 www.dragonnorth.com mnewman@dragonnorth.com ------=_NextPart_000_202F_01C83846.4C2B4730 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
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 my=20 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 the=20 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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