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 5.1c.2) with ESMTP id 1310463 for flyrotary@lancaironline.net; Sat, 05 Aug 2006 23:39:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-111-186.carolina.res.rr.com [24.74.111.186]) by ms-smtp-03.southeast.rr.com (8.13.6/8.13.6) with SMTP id k763cMPF018728 for ; Sat, 5 Aug 2006 23:38:24 -0400 (EDT) Message-ID: <001e01c6b909$d18ed1c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Exhaust Date: Sat, 5 Aug 2006 23:38:44 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C6B8E8.4A2C0480" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C6B8E8.4A2C0480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable John, no doubt a sturdy exhaust. However, it may not provide you will = maximum power. When I read early-on that the rotary engine needed = minimum back-pressure for performance, I also though that a large = diameter tube would provide minimum back-pressure. It turns out that is = not the case. It has more to do with reflected waves and length of your = header pipes. Smaller pipes keeps the exhaust velocity up and the = reflected waves can help scavenge the chamber at certain rpm depending = primarily on the length of the header. =20 1 3/4 - 1 7/8" dia tubes are frequently mentioned. I use 2" diameter = which may be a bit on the large size. I wouldn't hesitate to fly with = your set up, but I think you may be looking for additional power later. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW ----- Original Message -----=20 From: John Downing=20 To: Rotary motors in aircraft=20 Sent: Saturday, August 05, 2006 10:02 PM Subject: [FlyRotary] Exhaust Enclosed is a picture of the 2 1/2" stainless exhaust hooked to stock = turbo manifold. Heavy, but bullet proof. JohnD -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_001B_01C6B8E8.4A2C0480 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
John, no doubt a sturdy exhaust.   = However, it=20 may not provide you will maximum power.  When I read early-on that = the=20 rotary engine needed minimum back-pressure for performance, I also = though that a=20 large diameter tube would provide minimum back-pressure.  It turns = out that=20 is not the case.  It has more to do with reflected waves and length = of your=20 header pipes.  Smaller pipes keeps the exhaust velocity up and the=20 reflected waves can help scavenge the chamber at certain rpm depending = primarily=20 on the length of the header. 
 
1 3/4 - 1 7/8" dia tubes are frequently = mentioned.  I=20 use 2" diameter which may be a bit on the large size.  I wouldn't = hesitate=20 to fly with your set up, but I think you may be looking for additional = power=20 later.
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.comhttp:/= /members.cox.net/rogersda/rotary/configs.htm#N494BW
----- Original Message -----
From:=20 John=20 Downing
Sent: Saturday, August 05, 2006 = 10:02=20 PM
Subject: [FlyRotary] = Exhaust

Enclosed is a picture of the 2 1/2" = stainless=20 exhaust hooked to stock turbo manifold.  Heavy, but bullet = proof. =20 JohnD

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Homepage:  http://www.flyrotary.com/
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