X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 29 May 2007 22:57:59 -0400 Message-ID: X-Original-Return-Path: Received: from smtp108.sbc.mail.mud.yahoo.com ([68.142.198.207] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with SMTP id 2073746 for lml@lancaironline.net; Tue, 29 May 2007 20:22:37 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.198.207; envelope-from=n98pb@sbcglobal.net Received: (qmail 87286 invoked from network); 30 May 2007 00:22:01 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=sbcglobal.net; h=Received:X-YMail-OSG:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:Importance:Thread-Index:In-Reply-To:X-MimeOLE; b=SZT8axsBpEb4XjoobykCbOlYHEkK9vvAOCbf/Ao4/1qTkpD5LVLcfWF1ER2g+93HWbs6Q/3zUbdMbbPXfDHx3/ByiHM+M8Ozb+o5MAjn5i7lTEFBcah4GFlA0O7JWa4Rg4FzO0Y7dtrKXDvQRCboZsdQiwh6l8PR5H+3lUofDi8= ; Received: from unknown (HELO Sam) (n98pb@sbcglobal.net@75.32.139.39 with login) by smtp108.sbc.mail.mud.yahoo.com with SMTP; 30 May 2007 00:22:00 -0000 X-YMail-OSG: s64On8QVM1n_yCYWDzhsXxxrV8Zz8TQNh8HhnXr.JcPJ1ZlzZbxLJ9FOUtJrBT2hb4L83WCDXQ-- From: X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Tru Trak ADI vs. Standard AI X-Original-Date: Tue, 29 May 2007 17:21:58 -0700 X-Original-Message-ID: <000501c7a250$89c45fa0$0201a8c0@Sam> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C7A215.DD6587A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 Importance: Normal Thread-Index: AceiEY5dXspHnWpSScaDyObJp1qf0AAPrwKg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C7A215.DD6587A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Look at the Dynon D10A or D100A for a backup instrument. Cost is right = and they perform very well. Flown several approaches with this instrument = for attitude and heading and found it to be very accurate. You can increase = the directional accuracy by purchasing an optional MSU. Pat Brunner =20 =20 -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Douglas Brunner Sent: Tuesday, May 29, 2007 9:51 AM To: lml@lancaironline.net Subject: [LML] Tru Trak ADI vs. Standard AI =20 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 =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 =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? =20 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. =20 D. Brunner Legacy N241DB hoping to fly in June ------=_NextPart_000_0006_01C7A215.DD6587A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Look at the Dynon D10A or D100A = for a backup instrument.  Cost is right and they perform very well.  = Flown several approaches with this instrument for attitude and heading and found it to = be very accurate.  You can increase the directional accuracy by = purchasing an optional MSU.

Pat Brunner

 

 

-----Original = Message-----
From: Lancair Mailing = List [mailto:lml@lancaironline.net] On = Behalf Of Douglas Brunner
Sent: Tuesday, May 29, = 2007 9:51 AM
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

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