Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Wed, 01 Oct 2003 20:01:12 -0400 Message-ID: X-Original-Return-Path: Received: from [128.83.126.134] (HELO mail.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP-TLS id 2620173 for flyrotary@lancaironline.net; Wed, 01 Oct 2003 13:42:25 -0400 Received: (qmail 16532 invoked from network); 1 Oct 2003 17:42:23 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO benefits3.mail.utexas.edu) (146.6.191.101) by wb1.mail.utexas.edu with SMTP; 1 Oct 2003 17:42:23 -0000 X-Original-Message-Id: <5.1.1.5.2.20031001123124.021cce88@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 X-Original-Date: Wed, 01 Oct 2003 12:42:18 -0500 X-Original-To: "Rotary motors in aircraft" From: Mark Steitle Subject: Re: [FlyRotary] Re: alternator choice? In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed I'm not an expert in electronics. I was following the advice of Bob Nuckols on the Aero-electric connection. There are failure modes with internal regulators such as a "run-away" that can't be stopped by shutting off the field current. This possibility necessitates using over-voltage protection at a very minimum. The problem comes with how to hook OVP up to an internally regulated alternator. There's a schematic on the Aero-electric Connection at http://www.aeroelectric.com/articles/bleadov.pdf that shows how to do that. Its not that hard to bypass the internal regulator and go with a Ford solid-state regulator. They're reliable and very affordable. Add OVP and you're all set. At 10:13 AM 10/1/2003 -0700, you wrote: >What was the reason for going external regulator? By going to a dual >alternator can't I just switch one off if it goes bonkers (or have an >overvoltage relay do that for me)? > >re