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 5.2.11) with ESMTPS id 3412826 for flyrotary@lancaironline.net; Tue, 06 Jan 2009 10:12:59 -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="4.36,339,1228118400"; d="scan'208";a="108758871" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 06 Jan 2009 07:12:19 -0800 Received: from [10.62.16.115] (ernestc-thinkcenter-kubuntu64.hq.netapp.com [10.62.16.115]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id n06FCJHv015776 for ; Tue, 6 Jan 2009 07:12:19 -0800 (PST) Message-ID: <496374D8.4080807@nc.rr.com> Date: Tue, 06 Jan 2009 10:12:24 -0500 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 2.0.0.18 (X11/20081125) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Muffler design (was 20B isssues . . ) References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Al Gietzen wrote: > Unless I did the math wrong; the maximum filling fraction you can get > with these rods is about .8. So I think there would be a problem there. > > Well, I've worked out a way to put together a simple experimental bench-top apparatus that will allow me to quickly put together various crystal arrangements. I've got some recordings of rotaries running. I'll set up a configuration, pipe the recording into one end, record it on the other, and then do a spectral analysis on the new recording. Running the analysis on a recording without the intervening filter will be my control. Now that I'm excited. I've got to try to get some work done. 8*)