X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 21 Dec 2007 15:46:26 -0500 Message-ID: X-Original-Return-Path: Received: from mta16.adelphia.net ([68.168.78.211] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2608187 for lml@lancaironline.net; Fri, 21 Dec 2007 07:43:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.211; envelope-from=glcasey@adelphia.net Received: from [75.82.212.14] by mta16.adelphia.net (InterMail vM.6.01.05.04 201-2131-123-105-20051025) with ESMTP id <20071221124227.GFJV2629.mta16.adelphia.net@[75.82.212.14]> for ; Fri, 21 Dec 2007 07:42:27 -0500 Mime-Version: 1.0 (Apple Message framework v752.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-101-890413433 X-Original-Message-Id: From: Gary Casey Subject: Re: Skoppe lancair 4 pt X-Original-Date: Fri, 21 Dec 2007 04:42:25 -0800 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.752.2) --Apple-Mail-101-890413433 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed There are certainly lots of opinions out there on this subject. For me, I like the idea that the backup doesn't even require electricity, let alone electronics. I use a vacuum pump and old-fashioned gyros on my non-turbocharged plane. If it were a turbo recip I designed a pressure regulator that taps off manifold vacuum and compressor discharge pressure to create a steady source for the gyro - no pump required. In the case of a PT there is a constant source of air pressure available, so to me the answer would be obvious. Whatever the reliability is, the result of a lightning strike can be random - you could loose all electronics or just a few, no predicting. Not going to go near a lightning strike? Yeah, right. I think the idea of a battery backup works a lot better if the backup system is always disconnected from the main system. That means you would have to leave it off until you needed it. I don't think I like that idea either. Gary Casey On Dec 21, 2007, at 3:00 AM, Lancair Mailing List wrote: > > From: Guy and Jill Foreman > Date: December 20, 2007 10:39:10 AM PST > To: lml@lancaironline.net > Subject: Re: [LML] Re: Skoppe lancair 4 pt > > > Hello, > I have been flying full EFIS equipment for the airlines for about > 10 years. The backup Attitude indicator on our equipment is also > EFIS. It's about the same size as the small dynon. The backup > attitude indicator has a backup battery that will last up to 3 > hours. If you have a backup battery for your dynon, I see no > problem with your setup. > Guy --Apple-Mail-101-890413433 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 There are certainly lots of opinions out there on this subject. =A0For = me, I like the idea that the backup doesn't even require electricity, = let alone electronics. =A0I use a vacuum pump and old-fashioned gyros on = my non-turbocharged plane. =A0If it were a turbo recip I designed a = pressure regulator that taps off manifold vacuum and compressor = discharge pressure to create a steady source for the gyro - no pump = required. =A0In the case of a PT there is a constant source of air = pressure available, so to me the answer would be obvious. =A0Whatever = the reliability is, the result of a lightning strike can be random - you = could loose all electronics or just a few, no predicting. =A0Not going = to go near a lightning strike? =A0Yeah, right. =A0I think the idea of a = battery backup works a lot better if the backup system is always = disconnected from the main system. =A0That means you would have to leave = it off until you needed it. =A0I don't think I like that idea = either.

Gary = Casey

On Dec 21, 2007, at 3:00 AM, Lancair Mailing List = wrote:

From: = Guy and Jill Foreman <guyjill01@hotmail.com>=
Date: December 20, 2007 10:39:10 AM = PST
To: lml@lancaironline.net
Subject: Re: [LML] Re: Skoppe lancair 4 = pt

Hello,
I have been = flying full EFIS equipment for the airlines for about 10 years. The = backup Attitude indicator on our equipment is also EFIS. It's=A0about = the same size as the small dynon. The backup attitude indicator has a = backup battery=A0that will last up to 3 hours. If you have a backup = battery for your dynon, I see no problem with your setup.
= Guy

= --Apple-Mail-101-890413433--