X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from jrcda.com ([206.130.116.53] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6633583 for lml@lancaironline.net; Tue, 10 Dec 2013 13:11:11 -0500 Received-SPF: none receiver=logan.com; client-ip=206.130.116.53; envelope-from=hwasti@lm50.com Received: from [192.168.1.120] (207-170-226-183.static.twtelecom.net [207.170.226.183]) (authenticated bits=0) by jrcda.com (8.13.1/8.13.1) with ESMTP id rBAI7nmK028210 for ; Tue, 10 Dec 2013 11:07:49 -0700 Message-ID: <52A7586C.2060600@lm50.com> Date: Tue, 10 Dec 2013 10:07:40 -0800 From: Hamid Wasti User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.1.1 MIME-Version: 1.0 To: Lancair Mailing List Subject: Re: [LML] Re: Gap Seals References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Are V1, V2 and V3 ground speeds? If so, the equation implies that if you can find a high wind day and fly slow enough that V2 becomes zero, your true airspeed will go to infinity! 

There is no easier and cheaper to go faster :)

Hamid


On 12/10/2013 9:11 AM, Chris Zavatson wrote:
It looks like that was just an average of the four ground speeds.  As winds aloft get stronger, the error will grow.
With three orthogonal ground tracks (not heading), one can get true airspeed and winds aloft.  With four tracks you can cross check for errors.
VTAS = SQRT( V1^2 + V2^2 + V3^2 + V1^2 * V3^2 / V2^2 ) / 2
Wind Component in 1 direction= ( V1 - V3 ) / 2
Wind Component in 2 direction= ( V2 - V1 * V3 / V2 ) / 2
Total Wind = SQRT(W1^2 + W2^2)
 
Chris Zavatson
N91CZ
360std
 
 


On Tuesday, December 10, 2013 6:57 AM, Alan Blevins <ablevins86@yahoo.com> wrote:
Thanks Fred and Ralf. Just bought $200 worth of gap seals recently but we haven't had time to install. The heat gun tip should save some aggravation!
 
We will let you know how it all works out,
 
Alan and Steve