X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 29 May 2007 12:51:03 -0400 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 5.1.9) with ESMTP id 2072955 for lml@lancaironline.net; Tue, 29 May 2007 12:33:42 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.65; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=kBtEqEY61D5dVq01Ep81CiTh3qR7WVQI2mu6kBVi8A9TVrOh4HdEWFCCgE1MrCU6; h=Received:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [63.224.229.28] (helo=DFWK3391) by elasmtp-kukur.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1Ht4d5-0003Ih-GD for lml@lancaironline.net; Tue, 29 May 2007 12:33:03 -0400 X-Original-Message-ID: <000001c7a20f$04714610$0a02a8c0@DFWK3391> From: "Douglas Brunner" X-Original-To: "Mailing List Lancair" Subject: Tru Trak ADI vs. Standard AI X-Original-Date: Tue, 29 May 2007 04:18:41 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01C7A1A8.7029BE30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac0c864d17e3813b99a61cb7000647ccf261db676d6cd54d6c6350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 63.224.229.28 This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C7A1A8.7029BE30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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. =20 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. =20 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_0009_01C7A1A8.7029BE30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

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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