Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2993478 for flyrotary@lancaironline.net; Sun, 15 Feb 2004 16:39:36 -0500 Received: from edward (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i1FLdSiV010222 for ; Sun, 15 Feb 2004 16:39:30 -0500 (EST) Message-ID: <001701c3f40c$36bdf730$2402a8c0@edward> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: muffler? Date: Sun, 15 Feb 2004 16:39:38 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C3F3E2.4D699770" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C3F3E2.4D699770 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Actually, I agree with Tracy. My engine doesn't sound nearly as loud as = when I first started flying it. Those 90 Deg bends (and a couple of = hundred hours) do wonders for reducing the noise level {:>) Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Sunday, February 15, 2004 4:02 PM Subject: [FlyRotary] Re: muffler? The guys with straight pipes (even with a lot of 90 degree turns) = think they work GREAT! Their hearing went bad shortly after they = started flying them : ) Tracy (waiting on some 2 1/4" pipe to hook up the Hushpower II = muffler) Weight (9 lbs) is about 4 pounds less than my Spintech=20 ----- Original Message ----- From: Russell Duffy Sent: Sunday, February 15, 2004 12:57 PM To: Rotary motors in aircraft Subject: [FlyRotary] muffler? Greetings, I'm working on mounting this 14 pound Spin Tech muffler, and just = have to ask a question... I know that rotaries are painfully loud with no exhaust on them. I = also know that the cast manifold alone will help significantly, and that = a turbo will reduce the noise to about normal Lycoming levels. As I = understand it, this is partly due to the fact that there are twists and = turns that the exhaust has to negotiate, which reduces the speed, and = eliminates the supersonic pulses. =20 As it turns out, my primary pipes will have to make three 90 degree = turns before they get to the collector. I've started wondering if these = three turns are enough to reduce the noise to an acceptable level. My = gut feeling is that it won't be enough, but I think some people are = already running with little to no muffling. I sure would like to = eliminate that muffler, but I'm not optimistic that it will be possible. = What do you think? Silly idea? Cheers, Rusty ------=_NextPart_000_0014_01C3F3E2.4D699770 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Actually, I agree with Tracy.  My engine = doesn't=20 sound nearly as loud as when I first started flying it.  Those 90 = Deg bends=20 (and a couple of hundred hours) do wonders for reducing the noise = level=20 {:>)
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Tracy = Crook
Sent: Sunday, February 15, 2004 = 4:02=20 PM
Subject: [FlyRotary] Re: = muffler?

The guys with straight pipes (even with a lot of 90 degree = turns) =20 think they work GREAT!  Their hearing went bad shortly=20 after they started flying them : )
 
Tracy   (waiting on some 2 1/4" pipe to hook up the = Hushpower=20 II muffler)  Weight (9 lbs) is about 4 pounds less than my = Spintech=20
 
----- Original Message -----
From:=20 Russell Duffy
Sent: Sunday, February 15, = 2004 12:57=20 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = muffler?
 
Greetings,
 
I'm working = on mounting=20 this 14 pound Spin Tech muffler, and just have to ask a=20 question...
 
I know that = rotaries=20 are painfully loud with no exhaust on them.  I also know that = the cast=20 manifold alone will help significantly, and that a turbo will reduce = the=20 noise to about normal Lycoming levels.  As I understand = it, this=20 is partly due to the fact that there are twists and turns that the = exhaust=20 has to negotiate, which reduces the speed, and eliminates the = supersonic=20 pulses. 
 
As it turns = out, my=20 primary pipes will have to make three 90 degree turns before they = get to the=20 collector.  I've started wondering if these three turns are = enough to=20 reduce the noise to an acceptable level.  My gut feeling = is that=20 it won't be enough, but I think some people are = already=20 running with little to no muffling.  I sure would like to=20 eliminate that muffler, but I'm not optimistic that it will be=20 possible.  What do you think?  Silly = idea?
 
Cheers,
Rusty
  
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