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 5.3c2) with ESMTPS id 3981088 for flyrotary@lancaironline.net; Wed, 18 Nov 2009 13:12:12 -0500 Received-SPF: softfail receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@nc.rr.com X-IronPort-AV: E=Sophos;i="4.44,766,1249282800"; d="scan'208";a="276517519" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 18 Nov 2009 10:11:37 -0800 Received: from [10.62.16.52] (ernestc-laptop.hq.netapp.com [10.62.16.52]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id nAIIBak6003457 for ; Wed, 18 Nov 2009 10:11:37 -0800 (PST) Message-ID: <4B0438D8.6090705@nc.rr.com> Date: Wed, 18 Nov 2009 13:11:36 -0500 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] Fish tail muffler References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit The phononic bandgap phenomenon relies on a crystalline type structure to work its magic. What if, instead of tubes stood vertical, the crystal structure was created by laying tubes longitudinally with the flow of the gasses? It would be MUCH easier to construct. Just tack weld a stack of tubes together. The parameters would be the diameter and length of the tubes. It would possibly be cheap, relatively light, very compact, and offer nearly zilch for back pressure. Dang-it, Lynn! Now, I've got to go do another whole set of experiments. 8*) Lynn Hanover wrote: > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------ > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html >