X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3414034 for flyrotary@lancaironline.net; Tue, 06 Jan 2009 22:10:41 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao103.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20090107030956.TMMC12838.fed1rmmtao103.cox.net@fed1rmimpo02.cox.net> for ; Tue, 6 Jan 2009 22:09:56 -0500 Received: from wills ([68.105.85.56]) by fed1rmimpo02.cox.net with bizsmtp id 0T9v1b0011CvZmk04T9xDC; Tue, 06 Jan 2009 22:09:57 -0500 X-Authority-Analysis: v=1.0 c=1 a=NSHW2kUv_6QA:10 a=Zgn9d7bnwx8A:10 a=fDiNJo1aMC0p-uCKFzYA:9 a=vpGt2AnGgypHydf9X9HOtcRmlA8A:4 a=NAcsVDG84Z4A:10 a=4vB-4DCPJfMA:10 a=U8Ie8EnqySEA:10 a=a_lYcm-iImQA:10 a=3oc9M9_CAAAA:8 a=Yi35XwShEbsaNvoGunYA:9 a=ljAgqsf0COQN7HvN-4kA:7 a=8pQOqFq7NgCrbpB4muwrromXq_cA:4 a=MSl-tDqOz04A:10 a=EzXvWhQp4_cA:10 a=AfD3MYMu9mQA:10 X-CM-Score: 0.00 Message-ID: <006a01c97075$6b6c3d30$38556944@wills> From: "Mike Wills" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: 20B install issues overcome Date: Tue, 6 Jan 2009 19:09:56 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0067_01C97032.5CFF22F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 This is a multi-part message in MIME format. ------=_NextPart_000_0067_01C97032.5CFF22F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Unfortunately I cant afford to equip all of my neighbors with ANR = headsets. :-) Mike ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Tuesday, January 06, 2009 5:01 AM Subject: [FlyRotary] Re: 20B install issues overcome I have a collection of discarded/destroyed/melted mufflers. I'm still = on the lookout for the "perfect muffler". I'll let you know when I find = it. So far, the only thing that works every time is the Lighspeed 33G. Mark On Mon, Jan 5, 2009 at 9:14 PM, Mike Wills wrote: At one point a few months ago I added a SuperTrapp to my existing = exhaust just to see if it would tame it a little. Cost me about 500RPM = on the top end with little or no improvement in the sound output. Mike Wills ----- Original Message -----=20 From: wrjjrs@aol.com=20 To: Rotary motors in aircraft=20 Sent: Monday, January 05, 2009 11:49 AM Subject: [FlyRotary] Re: 20B install issues overcome Earnest, I believe that the SuperTrapp muffler is an example of a band gap = device and it worked well, if properly tuned. I think the large block idea has merit too, but you will have to = allow enough thickness to prevent the tubes that see the exhaust first = to fight the harmonic vibration and heat. Different size diamonds in the = exhaust stream might also help fight harmonics. Bill Jepson -------------------------------------------------------------------------= - Get a free MP3 every day with the Spinner.com Toolbar. Get it Now. = ------=_NextPart_000_0067_01C97032.5CFF22F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Unfortunately I cant afford to equip = all of my=20 neighbors with ANR headsets. :-)
 
Mike
----- Original Message -----
From:=20 Mark = Steitle=20
Sent: Tuesday, January 06, 2009 = 5:01=20 AM
Subject: [FlyRotary] Re: 20B = install=20 issues overcome

I have a collection of discarded/destroyed/melted = mufflers. =20 I'm still on the lookout for the "perfect muffler".  I'll let you = know=20 when I find it.  So far, the only thing that works every time is = the=20 Lighspeed 33G.
 
Mark

On Mon, Jan 5, 2009 at 9:14 PM, Mike Wills = <rv-4mike@cox.net>=20 wrote:
At one point a few months ago I = added a=20 SuperTrapp to my existing exhaust just to see if it would tame it a = little.=20 Cost me about 500RPM on the top end with little or no improvement in = the=20 sound output.
 
Mike Wills
----- Original Message ----- =
From: = wrjjrs@aol.com
To: Rotary = motors in=20 aircraft
Sent: Monday, January 05, = 2009 11:49=20 AM
Subject: [FlyRotary] Re: = 20B install=20 issues overcome

Earnest,
I believe that the SuperTrapp muffler = is an=20 example of a band gap device and it worked well, if properly = tuned.
I=20 think the large block idea has merit too, but you will have to = allow=20 enough thickness to prevent the tubes that see the exhaust first = to fight=20 the harmonic vibration and heat. Different size diamonds in the = exhaust=20 stream might also help fight harmonics.
Bill Jepson



Get a free MP3 every day with the Spinner.com Toolbar. Get it Now.=20 =

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