X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx06.syd.iprimus.net.au ([210.50.76.235] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2079504 for flyrotary@lancaironline.net; Fri, 01 Jun 2007 20:19:54 -0400 Received-SPF: pass receiver=logan.com; client-ip=210.50.76.235; envelope-from=daval@iprimus.com.au X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgAAAFJUYEY6snLv/2dsb2JhbAAN X-IronPort-AV: E=Sophos;i="4.16,374,1175436000"; d="scan'208";a="49400456" Received: from 239.051.dsl.pth.iprimus.net.au (HELO [192.168.1.8]) ([58.178.114.239]) by smtp06.syd.iprimus.net.au with ESMTP; 02 Jun 2007 10:19:11 +1000 Mime-Version: 1.0 (Apple Message framework v624) In-Reply-To: References: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Message-Id: Content-Transfer-Encoding: quoted-printable From: david mccandless Subject: Re: [FlyRotary] Re: PP Ve??? was Re: Intake CFM air flow Date: Sat, 2 Jun 2007 08:19:10 +0800 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.624) On 2, Jun , at 6:22 AM, Lehanover@aol.com wrote: > > The advantage of the Pport is it's near lack of reversions. In the=20 > side port, the flat side of the rotor keeps showing up in the port=20 > entrance. In the Pport only the pointy end of the rotor crossing the=20= > port, and the lower half of that is connected to the low pressure from=20= > the open exhaust port and header. > =A0 > Lynn E. Hanover Hi Lynn, since the Pport has a 'near lack of reversions' which are the source of=20= "organ pipe" tuning theory; would you say that Pport engine is a lot=20 less sensitive to "tuned length" than a side port engine? Or does the Pport overlap between exhaust and inlet also cause a=20 pulsation which enhances 'organ pipe' tuned length. I think this is what I wanted to ask :) BR, Dave McC