X-Virus-Scanned: clean according to Sophos on Logan.com
Return-Path: <alventures@cox.net>
Received: from fed1rmmtao106.cox.net ([68.230.241.40] verified)
  by logan.com (CommuniGate Pro SMTP 5.2.14)
  with ESMTP id 3646553 for flyrotary@lancaironline.net; Tue, 19 May 2009 00:50:12 -0400
Received-SPF: none
 receiver=logan.com; client-ip=68.230.241.40; envelope-from=alventures@cox.net
Received: from fed1rmimpo01.cox.net ([70.169.32.71])
          by fed1rmmtao106.cox.net
          (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP
          id <20090519044931.DUXC25927.fed1rmmtao106.cox.net@fed1rmimpo01.cox.net>
          for <flyrotary@lancaironline.net>;
          Tue, 19 May 2009 00:49:31 -0400
Received: from BigAl ([72.192.135.181])
	by fed1rmimpo01.cox.net with bizsmtp
	id tGpW1b0093uzsQg03GpWMB; Tue, 19 May 2009 00:49:30 -0400
X-Authority-Analysis: v=1.0 c=1 a=4m8tpZpaAAAA:8 a=dIr5Eujwr0evUWa2tNEA:9
 a=-8Ps-Afh19D9e5nCFUFMd5ErMGQA:4
X-CM-Score: 0.00
From: "Al Gietzen" <ALVentures@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: Phonic Band gap filter
Date: Mon, 18 May 2009 21:51:19 -0800
Message-ID: <F90E5BBF1EBC4B09A5D0F41587C59FFA@BigAl>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.6838
Importance: Normal
Thread-Index: AcnYKcXE68fHfW61RniwWm5McLCETgAG9N4g
In-Reply-To: <list-3646485@logan.com>
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579

Maybe there is a way to get both.  This is the first results from my 
experiments with bandgap filters that I just did today.

http://ernest.isa-geek.org/Delta/Experiments/PhononicBandgapFilter.html

Ernest;

How are you defining 'filling fraction' ?

Al