X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rtp-iport-2.cisco.com ([64.102.122.149] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2715989 for flyrotary@lancaironline.net; Tue, 05 Feb 2008 10:05:32 -0500 Received-SPF: softfail receiver=logan.com; client-ip=64.102.122.149; envelope-from=echristley@nc.rr.com Received: from rtp-dkim-1.cisco.com ([64.102.121.158]) by rtp-iport-2.cisco.com with ESMTP; 05 Feb 2008 10:04:41 -0500 Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id m15F4eMk016901 for ; Tue, 5 Feb 2008 10:04:40 -0500 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id m15F4aQs016863 for ; Tue, 5 Feb 2008 15:04:40 GMT Received: from xfe-rtp-202.amer.cisco.com ([64.102.31.21]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 5 Feb 2008 10:04:36 -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); Tue, 5 Feb 2008 10:04:35 -0500 Message-ID: <47A87B06.2050605@nc.rr.com> Date: Tue, 05 Feb 2008 10:04:38 -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: Ignition advance Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 05 Feb 2008 15:04:35.0994 (UTC) FILETIME=[6BEF6FA0:01C86808] Authentication-Results: rtp-dkim-1; header.From=echristley@nc.rr.com; dkim=neutral Lynn, You've told us that the rotary like about 25 degrees BTDC of advance, and will run well at most any speed at that setting. Does that include starting speed? How much will performance be degraded as you back off to 10 degrees BTDC?