X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.25.9.102] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2204184 for flyrotary@lancaironline.net; Sat, 28 Jul 2007 09:15:45 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-03.southeast.rr.com (8.13.6/8.13.6) with SMTP id l6SDEXm0023903 for ; Sat, 28 Jul 2007 09:14:33 -0400 (EDT) Message-ID: <000d01c7d119$51256020$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Individual Exhaust Date: Sat, 28 Jul 2007 09:15:06 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="multipart/alternative"; boundary="----=_NextPart_000_0009_01C7D0F7.C9C774E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C7D0F7.C9C774E0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_000A_01C7D0F7.C9C774E0" ------=_NextPart_001_000A_01C7D0F7.C9C774E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Joe, I do exactly that, two headers one for each exhaust port. Here are two = possible downsides, louder exhaust note - its a fact that putting the = two into one collector and muffler makes it easier to lessen the noise = factor. The second possibility is that with the right lengths you may = be able to get some scavenging effect by combining two headers. =20 The plus side is easier to fabricate and perhaps less exhaust back = pressure. Ed ----- Original Message -----=20 From: Joe Ewen=20 To: Rotary motors in aircraft=20 Sent: Saturday, July 28, 2007 8:04 AM Subject: [FlyRotary] Individual Exhaust What downsides are there to running individual exhaust pipes from each = rotor instead of combining into a manifold and single exhaust. This = question came after seeing a picture of a P-51, which has 12 individual = exhaust stacks. The immediate advantages are: easier fabrication, no = need to allow for manifold/pipe expansion. Thanks, Joe ------=_NextPart_001_000A_01C7D0F7.C9C774E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Joe,
 
I do exactly that, two headers one for each = exhaust=20 port.  Here are two possible downsides, louder exhaust note - its a = fact=20 that putting the two into one collector and muffler makes it easier to = lessen=20 the noise factor.  The second possibility is that with the right = lengths=20 you may be able to get some scavenging effect by combining two = headers. =20
 
The plus side is easier to fabricate and perhaps = less=20 exhaust back pressure.
 
Ed
----- Original Message -----
From:=20 Joe = Ewen=20
Sent: Saturday, July 28, 2007 = 8:04=20 AM
Subject: [FlyRotary] Individual = Exhaust

What downsides are there to = running=20 individual exhaust pipes from each rotor instead of combining into a = manifold=20 and single exhaust.  This question came after seeing a = picture=20 of a P-51, which has 12 individual exhaust stacks.  The immediate = advantages are: easier fabrication, no need to allow for manifold/pipe = expansion.
 
Thanks,
Joe
3D""
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