X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 24 Jun 2008 20:55:17 -0400 Message-ID: X-Original-Return-Path: Received: from [216.200.145.38] (HELO omta0105.mta.everyone.net) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2983003 for lml@lancaironline.net; Tue, 24 Jun 2008 15:46:39 -0400 Received-SPF: none receiver=logan.com; client-ip=216.200.145.38; envelope-from=bknotts@buckeye-express.com Received: from sj1-dm102.mta.everyone.net (sj1-slb03-gw2 [172.16.1.96]) by omta0105.mta.everyone.net (Postfix) with ESMTP id 112E2940403 for ; Tue, 24 Jun 2008 12:45:59 -0700 (PDT) X-Eon-Dm: sj1-dm102 Received: by sj1-dm102.mta.everyone.net (EON-AUTHRELAY2 - 48f0e224) id sj1-dm102.485091f6.46e366 for ; Tue, 24 Jun 2008 12:45:58 -0700 X-Eon-Sig: AQK8DXBIYU72ZkDx9gIAAAAB,8becc9950aa8ad99c923c2c2084ae87d X-Original-Message-ID: <48614EF4.7090903@buckeye-express.com> X-Original-Date: Tue, 24 Jun 2008 15:45:56 -0400 From: "F. Barry Knotts" Reply-To: bknotts884@earthlink.net User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] IAS errors References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------010203080000090907030503" This is a multi-part message in MIME format. --------------010203080000090907030503 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit I've been sort of casually looking for this formula for a long time to program a handheld calculator. I know I've seen it somewhere in print before now, but I couldn't remember where. Paul, do you have an aeronautical engineering text that you would recommend as a reference for such exquisite trivia? Barry Knotts Paul Lipps wrote: > It's much easier to do the upwind-downwind speed runs ....... To get > density altitude, use this: dalt = baro altitude + 113.4' x (OATC + > 1.88E-3 x altitude - 15C). Then get rho ratio: rr = (1 - 6.88E-6 x > dalt)^4.256. Multiply the square root of rr times TAS to get IAS. --------------010203080000090907030503 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit I've been sort of casually looking for this formula for a long time to program a handheld calculator. I know I've seen it somewhere in print before now, but I couldn't remember where. Paul, do you have an aeronautical engineering text that you would recommend as a reference for such exquisite trivia?

Barry Knotts

Paul Lipps wrote:

It's much easier to do the upwind-downwind speed runs ....... To get density altitude, use this: dalt = baro altitude + 113.4' x (OATC + 1.88E-3 x altitude - 15C). Then get rho ratio: rr = (1 - 6.88E-6 x dalt)^4.256. Multiply the square root of rr times TAS to get IAS.

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