X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml Date: Wed, 20 Dec 2006 04:20:35 -0500 Message-ID: X-Original-Return-Path: Received: from vms046pub.verizon.net ([206.46.252.46] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1693530 for lml@lancaironline.net; Wed, 20 Dec 2006 03:09:17 -0500 Received: from jacky0da39824a ([71.111.142.190]) by vms046.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0JAK00JGKBYI6QG6@vms046.mailsrvcs.net> for lml@lancaironline.net; Wed, 20 Dec 2006 02:08:46 -0600 (CST) X-Original-Date: Wed, 20 Dec 2006 00:08:34 -0800 From: "Tom Gourley" Subject: Re: [LML] Re: electric attitude indicators X-Original-To: "Lancair Mailing List" Reply-to: "Tom Gourley" X-Original-Message-id: <001f01c7240e$0c8567c0$640610ac@jacky0da39824a> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Mailer: Microsoft Outlook Express 6.00.2900.3028 Content-type: multipart/alternative; boundary="----=_NextPart_000_001C_01C723CA.FDAF5280" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C723CA.FDAF5280 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable What would be the result of flying that through 1500fpm updrafts and = downdrafts with a level indication? After my previous post I was thinking about that. I've not yet flown = with a TruTrak ADI so this is speculation on my part. I guess a lot = depends on whether the ADI senses just acceleration or also detects = rotation about an axis. My guess is that in turbulence, where you're = bouncing up and down a lot, the pitch display on the ADI will behave = very much like a conventional gyro driven instrument. I'm not fond of = moderate turbulence, or worse, and generally try to avoid it. But my = experience has been that turbulence tends to upset roll more than pitch = and it appears the ADI displays bank angle directly so it should be a = good instrument for maintaining wings level. If you get caught in a = sustained downdraft, for example, it sounds to me like the ADI will show = a nose down pitch as long as you are descending. I think you would have = to arrest the descent to get a level indication. This is where the ADI = will behave differently than a conventional gyro and might take some = getting used to. I would very much like to hear from pilots who have = flight experience with the TruTrak ADI. Tom Gourley ------=_NextPart_000_001C_01C723CA.FDAF5280 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
What would be the result of flying that through 1500fpm = updrafts and=20 downdrafts
with a level indication?
 
After my previous post I was thinking = about=20 that.  I've not yet flown with a TruTrak ADI so this is = speculation on=20 my part.  I guess a lot depends on whether the ADI senses=20 just acceleration or also detects rotation about an axis.  My = guess is=20 that in turbulence, where you're bouncing up and down a lot, the pitch = display=20 on the ADI will behave very much like a conventional gyro driven=20 instrument.  I'm not fond of moderate turbulence, or = worse, and=20 generally try to avoid it.  But my experience has been that = turbulence=20 tends to upset roll more than pitch and it appears the ADI displays = bank=20 angle directly so it should be a good instrument for maintaining wings=20 level.  If you get caught in a sustained downdraft, for = example, it=20 sounds to me like the ADI will show a nose down pitch as long as you are = descending.  I think you would have to arrest the descent to = get a=20 level indication.  This is where the ADI will behave differently = than a=20 conventional gyro and might take some getting used to.  I = would very=20 much like to hear from pilots who have flight experience with the = TruTrak=20 ADI.
 
Tom Gourley
 
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