Return-Path: Received: from ddi.digital.net ([198.69.104.2]) by truman.olsusa.com (Post.Office MTA v3.1.2 release (PO203-101c) ID# 0-44819U2500L250S0) with ESMTP id AAA5073 for ; Sun, 4 Oct 1998 09:32:28 -0400 Received: from john (max-roc6-35.digital.net [208.14.38.35]) by ddi.digital.net (8.9.1/8.9.1) with SMTP id JAA08132 for ; Sun, 4 Oct 1998 09:32:28 -0400 (EDT) Message-Id: <3.0.3.32.19981004092403.006de75c@mail.digital.net> Date: Sun, 04 Oct 1998 09:24:03 -0400 To: lancair.list@olsusa.com From: John Cooper Subject: Battery cables X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Don't worry about the magnetic field from the battery cables running along the floor of the cockpit - even if they are split up like mine are. The magnetic field produced by a single conductor is proportional to the current and inversely proportional to the distance from the conductor. Your mag compass is far enough away that it should not be a problem. Also, those battery cables are carrying a high current only during cranking the engine, when you don't care about your mag compass reading. If you want to ease your mind about this, perform a simple test. Get yourself a cheap magnetic compass and hold it near to the battery cables of your car while someone else is cranking the engine. Then hold it 24" away and see if the needle still swings.