X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rv-out-0506.google.com ([209.85.198.225] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3412410 for flyrotary@lancaironline.net; Tue, 06 Jan 2009 00:49:49 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.198.225; envelope-from=afm528@gmail.com Received: by rv-out-0506.google.com with SMTP id f6so9593592rvb.7 for ; Mon, 05 Jan 2009 21:49:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:reply-to:to:references :in-reply-to:subject:date:organization:message-id:mime-version :content-type:x-mailer:thread-index:content-language:from; bh=SgIbW1dKH/5/UyuL5MffxVoAZGtUW3nrgZO0ZCzRmkg=; b=ROp5r/Ikyb/ULfLHWz/d8RuUyLFZa7s0RkaSyAL6ifbZm2Xszyzp3CJZlRbFPd9C2w 5I1S4wyN1bSxaGV2RfIPIsNZkyVgpvNqgai4qWYNDC1j68OfPH5YRfBV+8k79fPQNldd cMHXsI6CJgi79kEm7+E9tA8sqZxZUx0/kA7pc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=reply-to:to:references:in-reply-to:subject:date:organization :message-id:mime-version:content-type:x-mailer:thread-index :content-language:from; b=H/up1vMJX2Ywmx64i0DZExedkRRUZfp1daQCsDCn0jDSkltm9EfgV1x0HzzNT3ZPV1 9/A3GOu2yMmyPHAK+5pHTtXzfJwMD45RXlnsgEkqkRjoAeJWpTFkzlJq1gJYvsED6uro IJ45PiNceG+M8GupcNXTzk53a1aJkULTHddwQ= Received: by 10.141.89.13 with SMTP id r13mr10774884rvl.76.1231220953051; Mon, 05 Jan 2009 21:49:13 -0800 (PST) Return-Path: Received: from Michaellaptop (c-24-5-148-84.hsd1.ca.comcast.net [24.5.148.84]) by mx.google.com with ESMTPS id c20sm34114316rvf.5.2009.01.05.21.49.12 (version=SSLv3 cipher=RC4-MD5); Mon, 05 Jan 2009 21:49:12 -0800 (PST) Reply-To: To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: Re: 20B install issues overcome Date: Mon, 5 Jan 2009 21:48:54 -0800 Organization: moto.aero Message-ID: <000c01c96fc2$76437240$62ca56c0$@aero> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01C96F7F.68203240" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AclvrQT14v2EnJRJTxajT0jVPJXSJQAFEPTg Content-Language: en-us From: Michael McMahon This is a multipart message in MIME format. ------=_NextPart_000_000D_01C96F7F.68203240 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Interesting trivia, at least to me, is that Paul Moller of the Moller Skycar was also the inventor of the SuperTrapp mufflers. I built motorcycles and watched the "progress" of the Skycar for years before I learned of the connection. Michael McMahon From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mike Wills Sent: Monday, January 05, 2009 7:15 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 20B install issues overcome 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 ----- From: wrjjrs@aol.com To: Rotary motors in aircraft 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_000D_01C96F7F.68203240 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Interesting trivia, at least to me, is that Paul Moller = of the Moller Skycar was also the inventor of the SuperTrapp mufflers.  I = built motorcycles and watched the “progress” of the Skycar for = years before I learned of the connection.

 

Michael McMahon

 

From:= Rotary = motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mike = Wills
Sent: Monday, January 05, 2009 7:15 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 20B install issues = overcome

 

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 -----

Sent:<= /b> 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.

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