X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.123] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3646823 for flyrotary@lancaironline.net; Tue, 19 May 2009 10:36:54 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.123; envelope-from=echristley@nc.rr.com Received: from [192.168.0.19] (really [66.57.38.121]) by cdptpa-omta01.mail.rr.com with ESMTP id <20090519143617641.HXBH13751@cdptpa-omta01.mail.rr.com> for ; Tue, 19 May 2009 14:36:17 +0000 Message-ID: <4A12C3F7.4070906@nc.rr.com> Date: Tue, 19 May 2009 10:36:39 -0400 From: Ernest Christley User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Phonic Band gap filter References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Al Gietzen wrote: > http://ernest.isa-geek.org/Delta/Experiments/PhononicBandgapFilter.html > > Ernest; > > How are you defining 'filling fraction' ? > > Al > > Area of filler rods divided by total area. I probably computed it wrong. -- http://www.ernest.isa-geek.org