X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Mon, 18 Dec 2006 19:00:03 -0500 Message-ID: X-Original-Return-Path: Received: from mx1.pshift.com ([216.57.116.6] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1688214 for lml@lancaironline.net; Mon, 18 Dec 2006 16:29:52 -0500 Received-SPF: none receiver=logan.com; client-ip=216.57.116.6; envelope-from=colyncase@earthlink.net Received: from ccaselt (unverified [216.57.118.129]) by mx1.pshift.com (Vircom SMTPRS 4.35.480.0) with SMTP id for ; Mon, 18 Dec 2006 16:29:08 -0500 Received-SPF: none (mx1.pshift.com: domain of colyncase@earthlink.net does not designate any permitted senders) X-Modus-BlackList: 216.57.118.129=OK;colyncase@earthlink.net=OK X-Modus-RBL: 216.57.118.129=Excluded X-Modus-Trusted: 216.57.118.129=NO X-Original-Message-ID: <128a01c722eb$8cc247b0$0302a8c0@nvidia.com> From: "colyncase on earthlink" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: electric attitude indicators X-Original-Date: Mon, 18 Dec 2006 13:29:04 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_1287_01C722A8.7CCDCA20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_1287_01C722A8.7CCDCA20 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I plan to use a TruTrak ADI as a backup to my Cheltons and I feel = confident that this is not likely to be the "Achilles heel" of my plane. Doug, I agree with your comments re: lack of backups in GA aircraft. I'm betting on tru-trak for my auto-pilot and I expect their ADI = really is quite reliable and I like that (I think) it has it's own battery backup. I'm not clear exactly how = they do pitch. the ad says "gyro enhanced vertical speed" which sounds like it's either baro or gps, = which is another variable in the reliability equation. I remain somewhat circumspect about electrons, however, as I've had = the whole wiring harness on my car get fried, for example. Where I ended up personally is: - has to survive any single power source failure (vac or electric) - survive any single instrument failure - smooth failover (I don't have to do anything to get the backup to = come on line. ) - easy detection (two ai's next to each other with conspicuous = failure annunciators) - operational similarity of primary to backup (what your mind does = looking at a chelton is different than what it does when integrating = multiple steam gauges) On that last point, I have an electric AI two holes over from my vac ai = in my cessna. The electric responds slightly more slowly, has slightly different = markings and it requires looking 10 degrees to the right. I am amazed how different it feels to fly an approach with the electric = AI. Colyn ------=_NextPart_000_1287_01C722A8.7CCDCA20 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF

I plan to use a TruTrak ADI as a = backup to my=20 Cheltons and I feel confident that this is not likely to be = the
"Achilles=20 heel" of my plane.

Doug,

I agree with your = comments re:=20 lack of backups in GA aircraft.

I'm betting on = tru-trak for my=20 auto-pilot and I expect their ADI really is quite reliable and I like=20 that

(I think) it has it's own battery=20 backup. I'm not clear exactly how they do pitch. the = ad says=20 "gyro

enhanced vertical speed" which sounds = like it's=20 either baro or gps, which is another variable in the reliability=20 equation.

I remain somewhat = circumspect=20 about electrons, however, as I've had the whole wiring harness = on

my car get fried, for = example.

Where I ended up personally = is:

- has to survive any = single=20 power source failure (vac or electric)

- survive any single = instrument=20 failure

- smooth failover (I = don't have=20 to do anything to get the backup to come on line. )

- easy detection = (two ai's next=20 to each other with conspicuous failure annunciators)

- operational = similarity of=20 primary to backup (what your mind does looking at a chelton is = different=20 than what it does when integrating multiple steam gauges)

On that last point, I have an electric = AI two holes=20 over from my vac ai in my cessna.

The electric responds slightly = more slowly,=20 has slightly different markings and it requires looking 10 degrees = to the=20 right.

I am amazed how different it feels to = fly an=20 approach with the electric AI.

Colyn

------=_NextPart_000_1287_01C722A8.7CCDCA20--