X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx2.netapp.com ([216.240.18.37] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTPS id 3841033 for flyrotary@lancaironline.net; Tue, 08 Sep 2009 10:08:56 -0400 Received-SPF: softfail receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@nc.rr.com X-IronPort-AV: E=Sophos;i="4.44,352,1249282800"; d="scan'208";a="239896134" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 08 Sep 2009 07:08:22 -0700 Received: from [10.62.16.84] (ernestc-laptop.hq.netapp.com [10.62.16.84]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id n88E8LCS017664 for ; Tue, 8 Sep 2009 07:08:22 -0700 (PDT) Message-ID: <4AA66555.6020505@nc.rr.com> Date: Tue, 08 Sep 2009 10:08:21 -0400 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 2.0.0.22 (X11/20090608) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Muffling References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lynn Hanover wrote: > The fish tail muffler has been in service for years on motorcycles and > other machines. > > Its poor service life behind a rotary is due to the shock wave > dropping to subsonic by applying its energy to the flat sides of the > design. It is both a rflective and an impinging design. Reflective? Impinging? I think I know what you're referring to, but could you define the two terms more clearly? Do all mufflers fall into these two categories?