Return-Path: Sender: (Marvin Kaye) To: lml Date: Sat, 05 Jul 2003 14:02:44 -0400 Message-ID: X-Original-Return-Path: Received: from imo-r03.mx.aol.com ([152.163.225.99] verified) by logan.com (CommuniGate Pro SMTP 4.1b8) with ESMTP id 2456889 for lml@lancaironline.net; Sat, 05 Jul 2003 13:55:46 -0400 Received: from Sky2high@aol.com by imo-r03.mx.aol.com (mail_out_v36_r1.1.) id q.46.3aa139ec (4254) for ; Sat, 5 Jul 2003 13:55:43 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <46.3aa139ec.2c386b1f@aol.com> X-Original-Date: Sat, 5 Jul 2003 13:55:43 EDT Subject: Re: [LML] Re: Electrical Power Budget X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1057427743" X-Mailer: 9.0 for Windows sub 290 -------------------------------1057427743 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/5/2003 9:21:01 AM Central Daylight Time, lmetcalf@swbell.net writes: Just some real world experience, for what it's worth. Lee, You are correct. 'Tis bad to be marginal. The question is "Which equipment will go off-line or recycle if the voltage drops too low?" Some time back I had a marginal wire size to my essential bus (VM system is one item on that bus) and, over time, I added/changed electrical equipment (i.e. Terra (5W) -> Garmin 430(10W)) that resulted in a somewhat higher load - - So, with the lights on, the xpdr blipping, flaps in motion and a gear system blip, the voltage would momentarily drop below 7-8 volts (after the bus isolation diode dropped it by .7). That was just enough to recycle the engine monitor, including it's flight timer. Heavier gauge re-wiring of the bus interconnections and Essential bus to battery line has fixed that problem. Rob, Anything that's worth adding is probably electric - Go with the 60 A alternator and make sure inter-bus wiring is capable of handling a load greater than your first flight design. Scott Krueger 2003 Air Venture Cup Racer #94 Sky2high@aol.com LNC2 N92EX IO320 Aurora, IL (KARR) -------------------------------1057427743 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 7/5/2003 9:21:01 AM Central Daylight Time,=20 lmetcalf@swbell.net writes:

Just some real world experience, for what i= t's=20 worth.

Lee,

You are correct. 'Tis bad to be marginal.

The question is "Which equipment will go off-line or recycle if the=20 voltage drops too low?"

Some time back I had a marginal wire size to my essential bus (VM=20 system is one item on that bus) and, over time, I added/changed electrical=20 equipment (i.e. Terra (5W) -> Garmin 430(10W)) that resulted in=20 a somewhat higher load - - So, with the lights on, the xpdr blippi= ng, flaps in=20 motion and a gear system blip, the voltage would momentarily drop below 7-8=20 volts (after the bus isolation diode dropped it by .7). That was just=20 enough to recycle the engine monitor, including it's flight timer. Hea= vier=20 gauge re-wiring of the bus interconnections and Essential bus to battery lin= e=20 has fixed that problem.

Rob,

Anything that's worth adding is probably electric - Go with the 60 A=20 alternator and make sure inter-bus wiring is capable of handling a load grea= ter=20 than your first flight design.

Scott=20 Krueger
2003 Air Venture Cup Racer #94
Sky2high@aol.com
LNC2 N92EX=20= IO320=20 Aurora, IL (KARR)

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