Return-Path: Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3060639 for flyrotary@lancaironline.net; Wed, 03 Mar 2004 08:11:01 -0500 Received: from [67.34.208.89] by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040303131101.NUEQ1895.imf25aec.mail.bellsouth.net@[67.34.208.89]> for ; Wed, 3 Mar 2004 08:11:01 -0500 User-Agent: Microsoft-Entourage/10.1.4.030702.0 Date: Wed, 03 Mar 2004 08:10:49 -0500 Subject: Re: [FlyRotary] muffler questions From: Bulent Aliev To: Rotary motors in aircraft Message-ID: In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3161146250_23754486" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3161146250_23754486 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable On 3/2/04 11:52 PM, "kevin lane" wrote: > 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 wondered = why > this approach isn't also used. last week dr. chuck Williams spoke 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 that he suggeste= d a > muffler with a rotor inside, just like a turbo, althought performing no w= ork > other than dampening the sound pulses. has this approach ever been tried= ? > maybe that old joke about muffler bearings was true! since he was mostly > experienced with racing snowmobiles, he said they simply use very long ex= haust > pipes for noise suppression, although not a big concern in the racing cir= cuit. > I have tried looking up info on resonator 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) >=20 Yesterday I listened to a muffler with such a rotor on John Slade=B9s CZ. It=B9= s called turbo charger :) It works very good in killing the sound and helps with the power also. Bulent --B_3161146250_23754486 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Re: [FlyRotary] muffler questions On 3/2/04 11:52 PM, &qu= ot;kevin lane" <n3773@comcast.net> wrote:

it has struck me that the rotary engine is quite similar t= o the 2 cycle as far as exhaust noise.   since some 2 cycle engine= s use resonators I wondered why this approach isn't also used.  last we= ek dr. chuck Williams spoke at the chapter 782 meeting, a life-time expert o= n 2 cycles.  I couldn't get him to expound too much about exhaust, but = found it interesting that he suggested a muffler with a rotor inside, just l= ike a turbo, althought performing no work other than dampening the sound pul= ses.  has this approach ever been tried?  maybe that old joke abou= t muffler bearings was true!  since he was mostly experienced with raci= ng snowmobiles, he said they simply use very long exhaust pipes for noise su= ppression, although not a big concern in the racing circuit.  I have tr= ied looking up info on resonator design, but haven't come across anything ye= t.
Kevin Lane  Portland, OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~= n3773
(browse w/ internet explorer)

Yesterday I listened to a muffler with such a rotor on John Slade’s C= Z. It’s called turbo charger :)
It works very good in killing the sound and helps with the power also.
Bulent --B_3161146250_23754486--