X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 716402 for flyrotary@lancaironline.net; Fri, 09 Sep 2005 00:51:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m25.mx.aol.com (mail_out_v38_r5.3.) id q.13f.1b3a672e (4246) for ; Fri, 9 Sep 2005 00:50:17 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <13f.1b3a672e.30526e89@aol.com> Date: Fri, 9 Sep 2005 00:50:17 EDT Subject: Re: [FlyRotary] Re: flyrotary_Web_Archive To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1126241417" X-Mailer: 9.0 SE for Windows sub 5017 X-Spam-Flag: NO -------------------------------1126241417 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/8/2005 5:20:27 PM Pacific Standard Time, jerryhey@earthlink.net writes: Bill, That may be the ideal arrangement. Sure would be great to be able to curve the pipes down down under the engine. No matter where you run the pipes, there is no hope of reaching a tuned length inside the cowl. That is my opinion. I hope someone proves me wrong . Jerry Jerry, The Mazda Factory header we once ran on an RX-2 had two truly diverging head pipes 22-24 inches long. The tube was formed by hammering or hydroforming both sides of the pipe. The seam was visible on the side. They dumped into a diverging megaphone that exited under the middle of the passenger door. Spectacular horsepower, brutally narrow powerband, HURT YOU LOUD. I can't see how you could fit that headpipe length in a cowl pratically, and oh yea the pipes started at 2" and got bigger from there. When designing a aircraft muffler and header system we will have to try to follow the doctors oath; and first do no harm, or as little as we can. Bill Jepson -------------------------------1126241417 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 9/8/2005 5:20:27 PM Pacific Standard Time,=20 jerryhey@earthlink.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Bill,=20 That may be the ideal arrangement.  Sure would be great to be able to= =20 curve the pipes down  down under the engine. No matter where you run=20= the=20 pipes, there is no hope of reaching a tuned length inside the cowl. That i= s my=20 opinion.    I hope someone proves me wrong .  =20     Jerry
Jerry,
 The Mazda Factory header we once ran on an RX-2 had two truly=20 diverging head pipes 22-24 inches long. The tube was formed by hammering or=20 hydroforming both sides of the pipe. The seam was visible on the side. They=20 dumped into a diverging megaphone that exited under the middle of the passen= ger=20 door. Spectacular horsepower, brutally narrow powerband, HURT YOU LOUD. I ca= n't=20 see how you could fit that headpipe length in a cowl pratically, and oh yea=20= the=20 pipes started at 2" and got bigger from there. When designing a aircraft muf= fler=20 and header system we will have to try to follow the doctors oath; and first=20= do=20 no harm, or as little as we can.
Bill Jepson
-------------------------------1126241417--