X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 19 Dec 2007 22:06:50 -0500 Message-ID: X-Original-Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2606183 for lml@lancaironline.net; Wed, 19 Dec 2007 21:29:18 -0500 Received-SPF: none receiver=logan.com; client-ip=71.74.56.122; envelope-from=schaefer@rts-services.com Received: from Master.RTS-Services.com ([70.113.90.126]) by hrndva-omta03.mail.rr.com with ESMTP id <20071220022838.XQCO2900.hrndva-omta03.mail.rr.com@Master.RTS-Services.com> for ; Thu, 20 Dec 2007 02:28:38 +0000 Received: from RTSLaptop (cpe-70-113-90-126.austin.res.rr.com [70.113.90.126]) (authenticated bits=0) by Master.RTS-Services.com (8.13.1/8.13.1) with ESMTP id lBK2Pavg014182 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NO) for ; Wed, 19 Dec 2007 20:25:36 -0600 From: "Richard T. Schaefer" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Lancair 4p and 12v panel X-Original-Date: Wed, 19 Dec 2007 20:28:30 -0600 X-Original-Message-ID: <001201c842b0$02cd5eb0$0202fea9@RTSLaptop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0013_01C8427D.B832EEB0" X-Mailer: Microsoft Office Outlook 11 In-Reply-To: Thread-Index: AchCrSD4x2Na1NwWRFKI734Ae71OGAAAWYAg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Spam-Score: -0.701 () AWL,BAYES_00,DYN_RDNS_SHORT_HELO_HTML,HTML_MESSAGE,RDNS_DYNAMIC,WEIRD_PORT X-Scanned-By: MIMEDefang 2.58 on 192.168.10.101 This is a multi-part message in MIME format. ------=_NextPart_000_0013_01C8427D.B832EEB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable A traditional panel (all avionics off at engine start) is OK at 12V. With the newer system you usually have an engine monitor on and maybe = other things an EFIS, PFD, =85=20 when you start. =20 When you hit the starter with these electronics on you get quite a = voltage drop on the buss. This drop is often the culprit to avionics that have died during engine start. (And = NOT over voltage or voltage spikes as many have believed in the past) =20 With a 24V system you have a lot more headroom before you drive the electronics into a low voltage state. Most can handle 10-30V. I can provide you with details of why if you = like =85=20 =20 Another plus is that you have smaller wires because the current in = general is =BD that of a 12V system.=20 You may be able to use 1 size smaller wire for everything. =20 r.t.s. =20 _____ =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of marv@lancair.net Sent: Wednesday, December 19, 2007 8:11 PM To: lml@lancaironline.net Subject: [LML] Lancair 4p and 12v panel=20 =20 Posted for "John C. Bohn" : Im looking at purchasing a plane with a 12v panel and Jermey at Lancair = says they're problematic. Anyone heard of this before. John Bohn 5038872933 =20 -- =20 For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html ------=_NextPart_000_0013_01C8427D.B832EEB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

A traditional panel (all avionics = off at engine start) is OK at 12V.

With the newer system you usually = have an engine monitor on and maybe other things an EFIS, PFD, … =

when you = start.

When you hit the starter with these electronics on you get quite a voltage drop on the buss. This drop = is

often the culprit to avionics that = have died during engine start. (And NOT over voltage or voltage = spikes

as many have believed in the = past)

With a 24V system you have a lot = more headroom before you drive the electronics into a low voltage = state.

Most can handle 10-30V. I can = provide you with details of why if you like …

Another plus is that you have = smaller wires because the current in general is =BD that of a 12V system. =

You may be able to use 1 size = smaller wire for everything.

r.t.s.

From: = Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of marv@lancair.net
Sent: Wednesday, December = 19, 2007 8:11 PM
To: = lml@lancaironline.net
Subject: [LML] Lancair 4p = and 12v panel

Posted for "John C. Bohn" <JohnB@AGCEngineering.com>:

Im looking at purchasing a plane with a 12v panel and Jermey at Lancair = says
they're problematic. Anyone heard of this before.

John Bohn
5038872933

--

For =
archives and unsub =
http://mail.lancaironline.net:81/lists/lml/List.html

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