X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2718664 for flyrotary@lancaironline.net; Wed, 06 Feb 2008 22:14:55 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=echristley@nc.rr.com Received: from [192.168.0.19] (really [66.57.38.121]) by cdptpa-omta02.mail.rr.com with ESMTP id <20080207031415.PMFR12601.cdptpa-omta02.mail.rr.com@[192.168.0.19]> for ; Thu, 7 Feb 2008 03:14:15 +0000 Message-ID: <47AA7882.30107@nc.rr.com> Date: Wed, 06 Feb 2008 22:18:26 -0500 From: Ernest Christley User-Agent: Thunderbird 2.0.0.6 (X11/20071022) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Ignition advance References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit lehanover@aol.com wrote: > 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?? > > > For starting, I don,t know if you could tell. But off idle it would be un responsive, and have high EGTs. It has a very short stroke and very low torque. If you are worried about over advanced ignition causing a problem, just do 20 degrees. Once it gets broken in after 5 hours of hard running, it will start instantly at any setting between 20 and 27 degrees.? > Perfect! Absolutely perfect! I can hardwire it to fire at 20, and then have the computer add in more at speed. The mount I made for the VR sensors yesterday won't work. I made it just shy of a 1/4" to short on the left-hand side. Luckily, I have plenty of aluminum to destroy. -- http://www.ronpaultimeline.com