X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3413065 for flyrotary@lancaironline.net; Tue, 06 Jan 2009 11:41:06 -0500 Received: from WRJJRS@aol.com by imo-m23.mx.aol.com (mail_out_v39.1.) id q.c2c.4edeccd5 (37055) for ; Tue, 6 Jan 2009 11:40:59 -0500 (EST) Received: from smtprly-mb02.mx.aol.com (smtprly-mb02.mx.aol.com [64.12.207.149]) by cia-db04.mx.aol.com (v121_r5.5) with ESMTP id MAILCIADB041-5c6549638993272; Tue, 06 Jan 2009 11:40:58 -0500 Received: from FWM-D40 (fwm-d40.webmail.aol.com [205.188.162.16]) by smtprly-mb02.mx.aol.com (v121_r5.5) with ESMTP id MAILSMTPRLYMB023-5c6549638993272; Tue, 06 Jan 2009 11:40:51 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: 20B install issues overcome Date: Tue, 06 Jan 2009 11:40:51 -0500 X-AOL-IP: 66.253.96.220 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CB3E34AB76929B_ACC_CD_FWM-D40.sysops.aol.com" X-Mailer: AOL Webmail 40627-STANDARD Received: from 66.253.96.220 by FWM-D40.sysops.aol.com (205.188.162.16) with HTTP (WebMailUI); Tue, 06 Jan 2009 11:40:51 -0500 Message-Id: <8CB3E34AB6D0943-ACC-63@FWM-D40.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CB3E34AB76929B_ACC_CD_FWM-D40.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Michael, =C2=A0The SuperTrapp was a "fair" invention that bankrolled Mollers early ef= forts at the Skycar. He sold the company and then had to dupe investors to f= und the 20+ years of continued non-flight. Bill Jepson (former AFM 756) -----Original Message----- From: Michael McMahon To: Rotary motors in aircraft Sent: Mon, 5 Jan 2009 9:48 pm Subject: [FlyRotary] Re: 20B install issues overcome Interesting trivia, at least to me, is that Paul Moller of the Moller Skycar= was also the inventor of the SuperTrapp mufflers.=C2=A0 I built motorcycles= and watched the =E2=80=9Cprogress=E2=80=9D of the Skycar for years before I= learned of the connection. =C2=A0 Michael McMahon =C2=A0 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beha= lf Of Mike Wills Sent: Monday, January 05, 2009 7:15 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 20B install issues overcome =C2=A0 At one point a few months ago I added a SuperTrapp to my existing exhaust ju= st to see if it would tame it a little. Cost me about 500RPM on the top end=20= with little or no improvement in the sound output. =C2=A0 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 =C2=A0 Earnest, I believe that the SuperTrapp muffler is an example of a band gap device and= it worked w ell, if properly tuned. I think the large block idea has merit too, but you will have to allow enoug= h thickness to prevent the tubes that see the exhaust first to fight the har= monic vibration and heat. Different size diamonds in the exhaust stream migh= t also help fight harmonics. Bill Jepson =C2=A0 Get a free MP3 every day with the Spinner.com Toolbar. Get it Now.=20 ----------MB_8CB3E34AB76929B_ACC_CD_FWM-D40.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" Michael,
 The SuperTrapp was a "fair" invention that bankrolled Mollers early ef= forts at the Skycar. He sold the company and then had to dupe investors to f= und the 20+ years of continued non-flight.
Bill Jepson (former AFM 756)


-----Original Message-----
From: Michael McMahon <afm528@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 5 Jan 2009 9:48 pm
Subject: [FlyRotary] Re: 20B install issues overcome

Interesting trivia, at least to me, is that=20= Paul Moller of the Moller Skycar was also the inventor of the SuperTrapp muf= flers.  I built motorcycles and watched the =E2=80=9Cprogress=E2=80=9D=20= of the Skycar for years before I learned of the connection.
 
Michael McMahon
 
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beha= lf 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 exist= ing exhaust just to see if it would tame it a little. Cost me about 500RPM o= n the top end with little or no improvement in the sound output.
 
Mike Wills
----- Original Message -----
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 enoug= h thickness to prevent the tubes that see the exhaust first to fight the har= monic vibration and heat. Different size diamonds in the exhaust stream migh= t also help fight harmonics.
Bill Jepson

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