X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from imo-m27.mx.aol.com ([64.12.137.8] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2022038 for flyrotary@lancaironline.net; Wed, 02 May 2007 15:37:27 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.8; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m27.mx.aol.com (mail_out_v38_r9.2.) id q.d10.98cf6e7 (60465) for ; Wed, 2 May 2007 15:36:17 -0400 (EDT) Received: from webmail-dd10 (webmail-dd10.webmail.aol.com [205.188.104.10]) by ciaaol-m01.mx.aol.com (v115.11) with ESMTP id MAILCIAAOLM012-ec314638e831d4; Wed, 02 May 2007 15:36:17 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] How does the air know????????? Date: Wed, 02 May 2007 15:36:17 -0400 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8C95B0849A88997_550_BB74_webmail-dd10.sysops.aol.com" X-Mailer: AOL WebMail 25698 Received: from 65.161.241.3 by webmail-dd10.sysops.aol.com (205.188.104.10) with HTTP (WebMailUI); Wed, 02 May 2007 15:36:17 -0400 Message-Id: <8C95B0849A88997-550-64FC@webmail-dd10.sysops.aol.com> X-AOL-IP: 205.188.104.10 X-Spam-Flag: NO ----------MB_8C95B0849A88997_550_BB74_webmail-dd10.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Tony, I'll just do the minimal desription here. Air has mass, and air going into an engine is doing so with some velocity. The "problem" here isn't the air, it is the way the air is controlled going into your particular ICE. When the valve or port in the case of the rotary opens the air rushes into the housing, or cylinder in a piston engine. When the port closes the air bounces off the rotor and back up the tube. Tuning is the act of trying to control the bounce, and improve the inrush of air. The subject can be made incredibly complex if you try to control every variable. The reality is that most set-up that aren't super bad will run. What we are talking about is improving the performance and therefore increasing the power and reduceing the amount of fuel needed to achieve that performance. Driveability is another factor, but less so for aircraft.Bill Jepson -----Original Message----- From: tonyslongez@cox.net To: flyrotary@lancaironline.net Sent: Wed, 2 May 2007 10:41 AM Subject: [FlyRotary] How does the air know????????? This may be a silly question but, (here goes) How does the air know? how does the air know the length of the intake( runners) tubes versus the lenth of say a plenum? What if I have a really long plenum that acts like a long tube. how does the air know when it has reached an intake tube or port. Do you understand what I'm trying to ask? air is air ! Is it all just a preasure game with these intakes? How many different types of preasure are there? I get the length part of it. I guess where I'm confused is the difference between a plenum and an intake runner, can a plenum act as an intake runner? Tony -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ________________________________________________________________________ AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com. ----------MB_8C95B0849A88997_550_BB74_webmail-dd10.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"

Tony, I'll just do the minimal desription here. Air has mass, and air going into an engine is doing so with some velocity. The "problem" here isn't the air, it is the way the air is controlled going into your particular ICE. When the valve or port in the case of the rotary opens the air rushes into the housing, or cylinder in a piston engine. When the port closes the air bounces off the rotor and back up the tube. Tuning is the act of trying to control the bounce, and improve the inrush of air. The subject can be made incredibly complex if you try to control every variable. The reality is that most set-up that aren't super bad will run. What we are talking about is improving the performance and therefore increasing the power and reduceing the amount of fuel needed to achieve that performance. Driveability is another factor, but less so for aircraft.

Bill Jepson

-----Original Message-----
From: tonyslongez@cox.net
To: flyrotary@lancaironline.net
Sent: Wed, 2 May 2007 10:41 AM
Subject: [FlyRotary] How does the air know?????????

This may be a silly question but, (here goes) How does the air know?
how does the air know the length of the intake( runners) tubes versus the lenth 
of say a plenum?  What if I have a really long plenum that acts like a long 
tube. how does the air know when it has reached an intake tube or port.

Do you understand what I'm trying to ask? air is air ! 

Is it all just a preasure game with these intakes?
How many different types of preasure are there?

I get the length part of it. I guess where I'm confused is the difference 
between a plenum and an intake runner, can a plenum act as an intake runner?

Tony

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