X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Fri, 08 Dec 2006 10:35:43 -0500 Message-ID: X-Original-Return-Path: Received: from relay2.av-mx.com ([137.118.16.124] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1653106 for lml@lancaironline.net; Thu, 07 Dec 2006 23:20:28 -0500 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.124; envelope-from=pinetownd@volcano.net X-Virus-Scan-Time: 0 Received: from [137.118.16.54] (HELO mx4.av-mx.com) by relay2.av-mx.com (CommuniGate Pro SMTP 4.2.10) with SMTP id 509676384 for lml@lancaironline.net; Thu, 07 Dec 2006 23:20:09 -0500 Received: (qmail 27116 invoked by uid 504); 8 Dec 2006 04:20:08 -0000 Received: from 63-170-119-133.du.volcano.net (HELO DennisDell) (pinetownd@volcano.net@63.170.119.133) by 0 with SMTP; 8 Dec 2006 04:20:08 -0000 X-CLIENT-IP: 63.170.119.133 X-CLIENT-HOST: 63-170-119-133.du.volcano.net X-Original-Message-ID: <00ca01c71a80$1e626750$6601a8c0@DennisDell> From: "Dennis Johnson" X-Original-To: Subject: More Exciting X-Original-Date: Thu, 7 Dec 2006 20:19:55 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C7_01C71A3D.0F745D40" 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_00C7_01C71A3D.0F745D40 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Paul Lipps wrote, "'Guess I don't quite understand the scenario of why = the regulator, which supplies the excitation to the alternator field, = would get disconnected if the battery post disconnected. " Most alternators will not reliably continue to produce electricity = without the smoothing affect of a battery connected to it. Charging = systems assume connection to a battery and are not designed to continue = functioning without a one to moderate the output of the alternator. =20 In my previous example of a battery post breaking off, the alternator = would quit, possibly by going over-voltage and tripping the over-voltage = disconnect. Unless the pilot has a backup alternator that is = self-exciting or was excited at some point during the flight prior to = the battery failure, the pilot is SOL; no battery, no alternator. The = SD-8 permanent magnet alternator from B&C comes with a large capacitor = that allows it to function without connection to a battery. If it's = wired with the self-exciting scheme or if it was excited earlier in the = flight, the pilot now has the eight amps or so output of the SD-8. Dennis Johnson Legacy #257, prop installed today and timing the mag tomorrow=20 ------=_NextPart_000_00C7_01C71A3D.0F745D40 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Paul Lipps wrote, "'Guess I don't quite = understand=20 the scenario of why the regulator, which supplies the excitation to the=20 alternator field, would get disconnected if the battery post = disconnected.=20 "

Most alternators will not reliably continue to = produce electricity=20 without the smoothing affect of a battery connected to it. = Charging=20 systems assume connection to a battery and are not designed to continue=20 functioning without a one to moderate the output of the = alternator. =20

In my previous example of a battery post breaking off, the = alternator would=20 quit, possibly by going over-voltage and tripping the over-voltage=20 disconnect. Unless the pilot has a backup alternator that is = self-exciting=20 or was excited at some point during the flight prior to the battery = failure, the pilot is SOL; no battery, no alternator. The SD-8 = permanent=20 magnet alternator from B&C comes with a large capacitor that = allows it=20 to function without connection to a battery. If it's wired with = the=20 self-exciting scheme or if it was excited earlier in the flight, the = pilot now=20 has the eight amps or so output of the SD-8.

Dennis Johnson

Legacy #257, prop installed today and timing the mag=20 tomorrow

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