Return-Path: Received: from [206.228.212.23] (HELO mail.statesville.net) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2993464 for flyrotary@lancaironline.net; Sun, 15 Feb 2004 16:49:47 -0500 Received: from TWJames [63.162.171.178] by mail.statesville.net (SMTPD32-8.05) id AA271DB600D2; Sun, 15 Feb 2004 16:52:39 -0500 From: "Tommy James" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] muffler? Date: Sun, 15 Feb 2004 16:49:47 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C3F3E3.B84D8640" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-RBL-Warning: REVDNS: This E-mail was sent from a MUA/MTA 63.162.171.178 with no reverse DNS entry. X-Declude-Sender: twjames@statesville.net [63.162.171.178] X-Note: Scanned for Spam This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C3F3E3.B84D8640 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageHi Rusty, Yup, it's a silly idea because you can always take the muffler off later if you are correct. My best response is to put the spintech on. Regards, Tommy<>< -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Russell Duffy Sent: Sunday, February 15, 2004 12:56 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. 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_0006_01C3F3E3.B84D8640 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Hi=20 Rusty,  Yup, it's a silly idea because you can always take the = muffler off=20 later if you are correct.  My best response is to put the spintech=20 on.
Regards,
Tommy<><
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Russell=20 Duffy
Sent: Sunday, February 15, 2004 12:56 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary]=20 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 are=20 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 noise=20 to about normal Lycoming levels.  As I understand it, this = is partly=20 due to the fact that there are twists and turns that the exhaust has = to=20 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 it=20 won't be enough, but I think some people are already = running=20 with little to no muffling.  I sure would like to eliminate = that=20 muffler, but I'm not optimistic that it will be possible.  What = do you=20 think?  Silly idea?
 
Cheers,
Rusty
  
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