Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Wed, 24 Sep 2003 23:00:03 -0400 Message-ID: X-Original-Return-Path: Received: from [128.83.126.136] (HELO mail.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.1.4) with ESMTP-TLS id 2602242 for flyrotary@lancaironline.net; Wed, 24 Sep 2003 16:58:44 -0400 Received: (qmail 46848 invoked from network); 24 Sep 2003 20:58:43 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO benefits3.mail.utexas.edu) (146.6.191.101) by wb2.mail.utexas.edu with SMTP; 24 Sep 2003 20:58:43 -0000 X-Original-Message-Id: <5.1.1.5.2.20030924154947.0113a9b0@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 X-Original-Date: Wed, 24 Sep 2003 15:58:37 -0500 X-Original-To: "Rotary motors in aircraft" From: Mark Steitle Subject: Re: [FlyRotary] Re: DIE the short Answer In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Ed, Yes, the BMW unit did look big and heavy, but I'm sure we could do much better, if it would be worth the effort. Primarily, I was just interjecting another way of looking at the problem. It seems to me that it might be easier to build with your/our Craftsman equipment than the PTEDDIEIM (precision trombone EDDIE intake manifold). If, like you said, it may work but it isn't EDDIE, then this is not the direction we would want to go. I'll have to admit that I don't yet understand the EDDIE phenomenon, and will have to wait for Shady Bend to become enlightened. Mark S. P.S. Will EDDIE work on a 3-rotor? (Inquiring minds...) At 04:19 PM 9/24/2003 -0400, you wrote: >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