X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.12.137.3] (HELO imo-m22.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.2) with ESMTP id 2879117 for flyrotary@lancaironline.net; Wed, 30 Apr 2008 18:29:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.3; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m22.mx.aol.com (mail_out_v38_r9.3.) id q.d4e.26535863 (37037) for ; Wed, 30 Apr 2008 18:28:57 -0400 (EDT) Received: from webmail-nf06 (webmail-nf06.sim.aol.com [207.200.67.70]) by cia-db02.mx.aol.com (v121.5) with ESMTP id MAILCIADB027-90ad4818f2a8239; Wed, 30 Apr 2008 18:28:56 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Dual plugs Date: Wed, 30 Apr 2008 18:28:56 -0400 X-AOL-IP: 66.253.96.220 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CA7928B69B6376_208_234F_webmail-nf06.sim.aol.com" X-Mailer: AOL Webmail 36240-STANDARD Received: from 66.253.96.220 by webmail-nf06.sim.aol.com (207.200.67.70) with HTTP (WebMailUI); Wed, 30 Apr 2008 18:28:56 -0400 Message-Id: <8CA7928B6327B4E-208-116F@webmail-nf06.sim.aol.com> X-Spam-Flag: NO ----------MB_8CA7928B69B6376_208_234F_webmail-nf06.sim.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Pat, If you are firing sequenced, IE leading trailing you loose more on the loss of the leading plugs. About 60% 40% has always been the Mazda figure. If you fire both at the same time, as do most of us airheads, you still lose more on the loss of the leading plug but not as much. The trailing hole is so small that it mostly effects efficiency at lower speeds if you lose the trailing plug. My guess is that if the hole was opened up it wouldn't be as big a change. The loss of compression is your biggest reason for not doing it. A rotary needs dual ignition more than a piston engine does. Bill Jepson -----Original Message----- From: Patrick Panzera To: Rotary motors in aircraft Sent: Wed, 30 Apr 2008 2:13 pm Subject: [FlyRotary] Dual plugs How well does a rotary engine run if either the leading or trailing plug goes bye-bye? ? Thanks! ? Pat ----------MB_8CA7928B69B6376_208_234F_webmail-nf06.sim.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" Pat,
If you are firing sequenced, IE leading trailing you loose more on the loss of the leading plugs.
About 60% 40% has always been the Mazda figure. If you fire both at the same time, as do most
of us airheads, you still lose more on the loss of the leading plug but not as much. The trailing hole
is so small that it mostly effects efficiency at lower speeds if you lose the trailing plug. My guess is
that if the hole was opened up it wouldn't be as big a change. The loss of compression is your biggest
reason for not doing it. A rotary needs dual ignition more than a piston engine does.
Bill Jepson


-----Original Message-----
From: Patrick Panzera <panzera@experimental-aviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 30 Apr 2008 2:13 pm
Subject: [FlyRotary] Dual plugs

How well does a rotary engine run if either the leading or trailing plug goes bye-bye?
 
Thanks!
 
Pat
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