X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from sj-iport-6.cisco.com ([171.71.176.117] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2718055 for flyrotary@lancaironline.net; Wed, 06 Feb 2008 15:00:50 -0500 Received-SPF: softfail receiver=logan.com; client-ip=171.71.176.117; envelope-from=echristley@nc.rr.com Received: from sj-dkim-4.cisco.com ([171.71.179.196]) by sj-iport-6.cisco.com with ESMTP; 06 Feb 2008 12:00:02 -0800 Received: from sj-core-5.cisco.com (sj-core-5.cisco.com [171.71.177.238]) by sj-dkim-4.cisco.com (8.12.11/8.12.11) with ESMTP id m16K02o0006239 for ; Wed, 6 Feb 2008 12:00:02 -0800 Received: from xbh-rtp-201.amer.cisco.com (xbh-rtp-201.cisco.com [64.102.31.12]) by sj-core-5.cisco.com (8.12.10/8.12.6) with ESMTP id m16JxUOo022943 for ; Wed, 6 Feb 2008 20:00:01 GMT Received: from xfe-rtp-202.amer.cisco.com ([64.102.31.21]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 6 Feb 2008 14:59:48 -0500 Received: from [64.102.38.143] ([64.102.38.143]) by xfe-rtp-202.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 6 Feb 2008 14:59:48 -0500 Message-ID: <47AA11B9.9010405@nc.rr.com> Date: Wed, 06 Feb 2008 14:59:53 -0500 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 2.0.0.6 (X11/20071022) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Starting advance References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 06 Feb 2008 19:59:48.0572 (UTC) FILETIME=[D3DE19C0:01C868FA] Authentication-Results: sj-dkim-4; header.From=echristley@nc.rr.com; dkim=neutral Kelly Troyer wrote: > Ernest, > Do not know if Lynn is on here lately but he has indicated in the past that the 13B > will start just fine with a 20-25 fixed advance.........Does the Megasquirt have a fixed > or variable advance either manual or based on RPM, etc ?? > The EDIS ignition controller has a set advance of 10 degrees. I can modify that by offsetting my VR sensor another 15 or so. It can be further modified by the Megasquirt with what's called the SAW input, but that input is now optional. I'm setting it up so that it will be a non-event if the Megasquirt drops out completely. I was worried that the optimal advance might be different for starting, which would make a computerless air-restart problematic. The plan, as it is coming together, is to have two EDIS-4 modules, one for the leading and one for the trailing. Each has a separate VR sensor, with the trailing's sensor offset 5 degree at the sensor wheel. The distributor will be replace with a small generator, with just enough capacity to run one set of coils and one EDIS module. That power will be supplied to the ignition through a relay that will favor normal ships power (ie, the small generator generally won't do anything). If the alternator flies apart and the battery falls off the back of the plane, I'll retain partial ignition. (Fuel will be handled through an alternate gravity feed). I still need to test for interference between the two VR sensors, but I should be able to start generating pictures of completed work RSN.