Return-Path: Sender: (Marvin Kaye) To: lml Date: Tue, 22 Jul 2003 14:27:35 -0400 Message-ID: X-Original-Return-Path: Received: from grebe.mail.pas.earthlink.net ([207.217.120.46] verified) by logan.com (CommuniGate Pro SMTP 4.1) with ESMTP id 2500970 for lml@lancaironline.net; Tue, 22 Jul 2003 14:21:00 -0400 Received: from sdn-ap-008watacop0381.dialsprint.net ([65.176.73.127] helo=f3g6s4) by grebe.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 19f1ks-000296-00 for lml@lancaironline.net; Tue, 22 Jul 2003 11:20:55 -0700 X-Original-Message-ID: <004f01c3507d$d6a24a40$7f49b041@f3g6s4> Reply-To: "Dan Schaefer" From: "Dan Schaefer" X-Original-To: "Lancair list" Subject: Re: Essential Buss versus Fuel Endurance X-Original-Date: Tue, 22 Jul 2003 11:19:48 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 For those wh've experienced over-voltage events in their aircraft (and for those who likely will) check out Bob Nuckols over-voltage protection device - commonly referred to as a "over-voltage crowbar". I know he has one for 12 volt systems, not sure about 28 volt though. Simple device, easily installed and will pop the alternator field (if I remember right) breaker in micro seconds before the buss voltage exceeds dangerous levels. The indication that this has happened is a flashing yellow "low voltage" indicator telling you that the alternator is off line. If the condition was just a transient, resetting the field breaker will allow the alternator to come back on line. In the event of a hard (high voltage) failure, the crowbar will pop the breaker again. Pretty cool device as some of the stuff in our panels do not take kindly to excessive input voltage. Dan Schaefer