Return-Path: Received: from [65.54.169.65] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2993431 for flyrotary@lancaironline.net; Sun, 15 Feb 2004 16:02:53 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 15 Feb 2004 13:02:44 -0800 Received: from 64.159.104.85 by bay3-dav35.bay3.hotmail.com with DAV; Sun, 15 Feb 2004 21:02:44 +0000 X-Originating-IP: [64.159.104.85] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] muffler? Date: Sun, 15 Feb 2004 16:02:46 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0002_01C3F3DD.26EBB790" Message-ID: X-OriginalArrivalTime: 15 Feb 2004 21:02:44.0873 (UTC) FILETIME=[0EEAE790:01C3F407] ------=_NextPart_001_0002_01C3F3DD.26EBB790 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 flyin= g 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 tur= bo will reduce the noise to about normal Lycoming levels. As I understan= d 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 th= e 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 fee= ling is that it won't be enough, but I think some people are already runn= ing with little to no muffling. I sure would like to eliminate that muff= ler, but I'm not optimistic that it will be possible. What do you think?= Silly idea? Cheers, Rusty =20 ------=_NextPart_001_0002_01C3F3DD.26EBB790 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

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

----- Original Message -----

From: Russell Duffy=

Sent: Sunday, February 15, = 2004 12:57 PM

To: Rotary mot= ors in aircraft

Subject: [Fl= yRotary] muffler?

Greetings,

I'm working on mounting this 14 poun= d Spin Tech muffler, and just have to ask a question...

I = know that rotaries are painfully loud with no exhaust on them. I al= so know that the cast manifold alone will help significantly, and that a = turbo will reduce the noise to about normal Lycoming levels.  A= s I understand it, this is partly due to the fact that there are twists a= nd turns that the exhaust has to negotiate, which reduces the speed, and = eliminates the supersonic pulses.

<= DIV>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 e= nough 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 possib= le. What do you think? Silly idea?

<= SPAN class=3D875493817-15022004>
Cheers,

Rusty

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