Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.93.67.82] verified) by logan.com (CommuniGate Pro SMTP 4.1.4) with ESMTP id 2602161 for flyrotary@lancaironline.net; Wed, 24 Sep 2003 16:22:09 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-01.southeast.rr.com (8.12.5/8.12.2) with SMTP id h8OKEe0R002328 for ; Wed, 24 Sep 2003 16:14:40 -0400 (EDT) Message-ID: <004401c382d9$2084e400$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: DIE the short Answer Date: Wed, 24 Sep 2003 16:19:15 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Hi Mark, I saw that a while back on the web. Certainly looked interesting (but heavy and expensive to make). Also, while I am not absolutely certain about this. It seems from what I have read, most of these type variable manifolds are based on the "Organ Pipe" or "Helmholtz Resonator" theories or some combination/mix. The things they have in common is the resonance effect from a tube "tuned" to a selected frequency. Said resonance effect promoting air flow when engine operating RPM is on the "resonance". The type below change the place the "resonance" effect takes place so that they can continously vary it to match the operating RPM. They basically do this by varying the "effective length" of the intake tubes. However, the EDDIE is not based on any resonant effect. About the only thing I see the two having in common is the speed of sound. That is not to say that such a variable intake would not be useful as part of a basic induction system to promote airflow at different rpms, its just not the EDDIE. IMHO Ed Anderson ----- Original Message ----- From: "Mark Steitle" To: "Rotary motors in aircraft" Sent: Wednesday, September 24, 2003 2:25 PM Subject: [FlyRotary] Re: DIE the short Answer > > > > >What we really need is two telescopic tubes which slide into each other with > >O rings for a seal. The mechanism would be somewhat like a trombone for > >similar reasons, but it would have to be accurately machined. > > > >John > > Or, how about copying BMW's design? > > Mark S. ---------------------------------------------------------------------------- ---- > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >