X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 29 May 2007 15:45:13 -0400 Message-ID: X-Original-Return-Path: Received: from wr-out-0506.google.com ([64.233.184.237] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2073197 for lml@lancaironline.net; Tue, 29 May 2007 14:23:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.237; envelope-from=akadamson@gmail.com Received: by wr-out-0506.google.com with SMTP id i3so673948wra for ; Tue, 29 May 2007 11:22:39 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:from:to:references:subject:date:message-id:mime-version:content-type:x-mailer:x-mimeole:thread-index:in-reply-to:sender; b=CYF1KlKkGsOFG1mnBieIlRrq1Lx3/GomXs/Hz2ZeLyQiGCEm612v4sbjNmS3ekjPH60ysJG33UqEFqMq9U+ZeGLg+AdtwyOaEPDKSOze9b1i38YMP5CH3ohq0bEv00C86oGfQym3pglxRiMp7WKjX5IBui17NpUjFkfvK2uyNH0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:from:to:references:subject:date:message-id:mime-version:content-type:x-mailer:x-mimeole:thread-index:in-reply-to:sender; b=uq7bwa2WFKyA2BDfblJ88WJ0+nSNljK2Ceo0cdphtawBhobkj5qB5LOTyQcX01qO+IBK7et3Wd+hItavQqpYOu+BfshCOELUrHIeaqoBhWLd/lPQB8KWLS0FJOJkFqQUFjtegonJgpChhbReUqd2/GuQ17bnola05DE3W9HSatg= Received: by 10.90.99.20 with SMTP id w20mr5170309agb.1180462959530; Tue, 29 May 2007 11:22:39 -0700 (PDT) X-Original-Return-Path: Received: from Typhoon ( [76.97.47.101]) by mx.google.com with ESMTP id 10sm7183014wrl.2007.05.29.11.22.38; Tue, 29 May 2007 11:22:38 -0700 (PDT) From: "Alan Adamson" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Tru Trak ADI vs. Standard AI X-Original-Date: Tue, 29 May 2007 14:22:36 -0400 X-Original-Message-ID: <01cd01c7a21e$55e24800$2201a8c0@highrf.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01CE_01C7A1FC.CED0A800" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Thread-Index: AceiEYyTR1Ayc/KMRGaSqB8XRzL2LwADGmHw In-Reply-To: X-Original-Sender: Alan Adamson This is a multi-part message in MIME format. ------=_NextPart_000_01CE_01C7A1FC.CED0A800 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Douglas, I solved this problem in both cost and function by simply putting in a Sportys 3" electric attitude indicator. If you did the 2" version of the ADI then Mid Cont has an electric version of the "life saver" in 2" , but it *aint* cheap! Yes, you loose heading info, but that's what the AP backup magnetometer (assuming a TT AP) is for if everything craps out... :) At least for my nickel, that's what I did in a Legacy. Alan _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Douglas Brunner Sent: Tuesday, May 29, 2007 12:51 PM To: lml@lancaironline.net Subject: [LML] Tru Trak ADI vs. Standard AI My panel is a dual Chelton panel with 3 backup instruments; altimeter, air speed and Tru Trak ADI. I specified a Tru Trak ADI rather than a standard Attitude Indicator because of price and the fact that the Tru Trak could also show heading. In case of a failure of my dual Cheltons (hopefully very unlikely) I would still have; altitude, air speed, heading and attitude. However, I have been re-thinking my choice of the Tru Trak ADI for the following reason. The ADI does not display pitch, but instead displays "gyro enhanced vertical speed". In most situations the "gyro enhanced vertical speed" should parallel pitch. However in a situation close to stall speed, I could be nose up but descending. In this case the ADI (if glanced at quickly) could lead me to believe that I was nose down and should pull back on the stick. A standard Attitude Indicator would show me nose up and give me a better idea of the true situation. I spoke to the Tru Trak representative at Sun n Fun and he stated that there are stall warnings built in to the system and that I could "retrain" myself to interpret the ADI properly. Nevertheless, I am concerned that in a difficult situation, I would interpret the Tru Trak in the way I would a standard AI. Your thoughts and advice? A drawback to going with the standard AI is the loss of the heading information that the Tru Trak can provide. Of course, I would still have my wet compass. D. Brunner Legacy N241DB hoping to fly in June ------=_NextPart_000_01CE_01C7A1FC.CED0A800 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Douglas,
 
I solved this problem in both cost and function = by simply=20 putting in a Sportys 3" electric attitude indicator.  If you did = the 2"=20 version of the ADI then Mid Cont has an electric version of the "life = saver" in=20 2" , but it *aint* cheap!
 
Yes, you loose heading info, but that's what = the AP backup=20 magnetometer (assuming a TT AP) is for if everything craps out...=20 :)
 
At least for my nickel, that's what I did in a=20 Legacy.
 
Alan

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of Douglas=20 Brunner
Sent: Tuesday, May 29, 2007 12:51 PM
To:=20 lml@lancaironline.net
Subject: [LML] Tru Trak ADI vs. Standard = AI

My panel is a dual Chelton panel with 3 = backup=20 instruments; altimeter, air speed and Tru Trak ADI. I specified a Tru = Trak ADI=20 rather than a standard Attitude Indicator because of price and the = fact=20 that the Tru Trak could also show heading.  In case of a failure of my dual Cheltons (hopefully very = unlikely) I=20 would still have; altitude, air speed, heading and attitude.  =
 
However, I have been re-thinking my = choice of the=20 Tru Trak ADI for the following reason.  The ADI does not display = pitch, but=20 instead displays "gyro enhanced vertical speed".  In most = situations the=20 "gyro enhanced vertical speed" should parallel pitch.  However in a = situation close to stall speed, I could be nose up but descending.  = In this=20 case the ADI (if glanced at quickly) could lead me to believe = that I=20 was nose down and should pull back on the stick.  A standard = Attitude=20 Indicator would show me nose up and give me a better idea of the true=20 situation. 
 
I spoke to the Tru Trak representative = at Sun n Fun=20 and he stated that there are stall warnings built in to the system and = that I=20 could "retrain" myself to interpret the ADI properly.  = Nevertheless, I am=20 concerned that in a difficult situation, I would interpret the Tru Trak = in the=20 way I would a standard AI.  Your thoughts and advice?
 
A drawback to going with the standard = AI is the=20 loss of the heading information that the Tru Trak can provide.  Of = course,=20 I would still have my wet compass.
 
D. Brunner
Legacy N241DB
hoping to fly in = June
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