X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3832442 for flyrotary@lancaironline.net; Tue, 01 Sep 2009 18:50:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; 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 <20090901224958368.HGKC8054@cdptpa-omta01.mail.rr.com> for ; Tue, 1 Sep 2009 22:49:58 +0000 Message-ID: <4A9DA54D.9050106@nc.rr.com> Date: Tue, 01 Sep 2009 18:50:53 -0400 From: Ernest Christley User-Agent: Thunderbird 2.0.0.22 (X11/20090608) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: vortex visualization Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lynn has often told us about vena contracta (sp?) at the opening of a tube or other flow restriction. It's one thing to be told about it, it's another to see it in action. I found this as I've been investigating my inline blower for boost. http://www.flometrics.com/services/pump/ BTW, it appears that if I build it well, I will be able to make a 170Hp installation a 190Hp installation with only 3 extra lbs. 2psi of boost will require less than 2Hp to generate and increase the engine output by a factor of roughly 1.13. -- Ernest Christley, President Ernest@TechnicalTakedown.com TechnicalTakedown, LLC www.TechnicalTakedown.com 101 Steep Bank Dr. Cary, NC 27518 (919) 741-9397