Return-Path: Received: from [65.54.169.145] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3060842 for flyrotary@lancaironline.net; Wed, 03 Mar 2004 10:05:44 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 3 Mar 2004 06:54:09 -0800 Received: from 64.159.104.175 by bay3-dav115.bay3.hotmail.com with DAV; Wed, 03 Mar 2004 14:54:09 +0000 X-Originating-IP: [64.159.104.175] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] muffler questions Date: Wed, 3 Mar 2004 09:54:08 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0000_01C40105.78D6E4F0" Message-ID: X-OriginalArrivalTime: 03 Mar 2004 14:54:09.0671 (UTC) FILETIME=[6240A170:01C4012F] ------=_NextPart_001_0000_01C40105.78D6E4F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable This question has come up several times. I type at a snails' pace so for= give me if I sound short. The idea is simply rubbish. The rotary may h= ave a similar exhaust sound with the two stroke but that is where the sim= ilarity ends. If you want the definitive story on the subject, get a copy of "Two-Strok= e Tuner's Handbook" by Gordon Jennings. Very interesting but of little = use to the rotary enthusiast other than to educate one about how little i= t applies to our engine of choice. Tracy Crook ----- Original Message ----- From: kevin lane Sent: Tuesday, March 02, 2004 11:53 PM To: Rotary motors in aircraft Subject: [FlyRotary] muffler questions it has struck me that the rotary engine is quite similar to the 2 cycle a= s far as exhaust noise. since some 2 cycle engines use resonators I won= dered why this approach isn't also used. last week dr. chuck Williams sp= oke at the chapter 782 meeting, a life-time expert on 2 cycles. I couldn= 't get him to expound too much about exhaust, but found it interesting th= at he suggested a muffler with a rotor inside, just like a turbo, althoug= ht performing no work other than dampening the sound pulses. has this ap= proach ever been tried? maybe that old joke about muffler bearings was t= rue! since he was mostly experienced with racing snowmobiles, he said th= ey simply use very long exhaust pipes for noise suppression, although not= a big concern in the racing circuit. I have tried looking up info on re= sonator design, but haven't come across anything yet. Kevin Lane Portland, OR e-mail-> n3773@comcast.net web-> http://home.comcast.net/~n3773 (browse w/ internet explorer) ------=_NextPart_001_0000_01C40105.78D6E4F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
This question has come up several times.&= nbsp; I type at a snails' pace so forgive me if I sound short.  The = idea is simply rubbish.   The rotary may have a similar exhaust=  sound with the two stroke but that is where the similarity end= s.
 
If you want the definitive story on the s= ubject, get a copy of "Two-Stroke Tuner's Handbook" by Gordon Jennings.&n= bsp;  Very interesting but of little use to the rotary enthusiast ot= her than to educate one about how little it applies to our engine of choi= ce.
 
Tracy Crook
 
 
----- Original Message -----
From: k= evin lane
Sent: Tuesday, Mar= ch 02, 2004 11:53 PM
To: Rot= ary motors in aircraft
Subject:<= /B> [FlyRotary] muffler questions
 
it has struck me that the rotary engine is quite sim= ilar to the 2 cycle as far as exhaust noise.   since some 2 cyc= le engines use resonators I wondered why this approach isn't also used.&n= bsp; last week dr. chuck Williams spoke at the chapter 782 meeting, a lif= e-time expert on 2 cycles.  I couldn't get him to expound too much a= bout exhaust, but found it interesting that he suggested a muffler with a= rotor inside, just like a turbo, althought performing no work other than= dampening the sound pulses.  has this approach ever been tried?&nbs= p; maybe that old joke about muffler bearings was true!  since he wa= s mostly experienced with racing snowmobiles, he said they simply use ver= y long exhaust pipes for noise suppression, although not a big concern in= the racing circuit.  I have tried looking up info on resonator desi= gn, but haven't come across anything yet.
Kevin Lane  Portland, OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(brow= se w/ internet explorer)
------=_NextPart_001_0000_01C40105.78D6E4F0--