X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rv-out-0506.google.com ([209.85.198.234] verified) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3413161 for flyrotary@lancaironline.net; Tue, 06 Jan 2009 12:19:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.198.234; envelope-from=rwstracy@gmail.com Received: by rv-out-0506.google.com with SMTP id f6so9884979rvb.7 for ; Tue, 06 Jan 2009 09:18:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:sender :to:subject:in-reply-to:mime-version:content-type:references :x-google-sender-auth; bh=JGj4RV+3B/RxKejdtKttpPoY7FtV0J/Xox96tI+VPSI=; b=BiU+PDVElg9UX0gI7CBgzZTXWhW1RqaiBjGp+hHR9T3P63EPO/AVktZl3Tj8Qg6FOJ BK9803eAs19M9RZHyLwaIL9lnwu9uQf8a9casdObDZYms3AvgKKOdfYebyhMMpSngEnx ku/uoCScKD0ANMzXurW5ZdX3j/Z0dPQZ7ja3U= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:in-reply-to:mime-version :content-type:references:x-google-sender-auth; b=Eqb710eBZ1NGT2JqbRnPw+w9TuW2b/1e/XoF9Zgzxq4NEyGSq/43RHF54fTl7YwU1D KXDv8DuaJ2FlIcxkjDHgV4lUeamrEqLMqmuxW/cZm/im7+LJ9YjQuD8xvgKeftcZAv7I omPQ8/nAOf3z+HFNV6WlRukc1NLThrq0sia44= Received: by 10.114.95.1 with SMTP id s1mr14651338wab.20.1231262337325; Tue, 06 Jan 2009 09:18:57 -0800 (PST) Received: by 10.114.61.10 with HTTP; Tue, 6 Jan 2009 09:18:57 -0800 (PST) Message-ID: <1b4b137c0901060918x2613d68byda0395e2b3424364@mail.gmail.com> Date: Tue, 6 Jan 2009 12:18:57 -0500 From: "Tracy Crook" Sender: rwstracy@gmail.com To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: 20B install issues overcome In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_193229_32679842.1231262337318" References: X-Google-Sender-Auth: 6c13c9183641cbf6 ------=_Part_193229_32679842.1231262337318 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Always wondered what the real story was on SuperTrapp performance because of all the conflicting reports. Just as an anecdotal SuperTrapp report, I took a racing course a few days ago at Sebring (Skip Barber Racing) and the pace cars were race preped Mazda Speed MX-5s with SuperTrapp mufflers. They had a very acceptable exhaust noise level and performed well. I didn't hear them when removed but I was told that without the SuperTrapps they were well beyond the race rules for noise. I was amazed that they would accelerate out of the turns as well as all the cars we drove except for the 450+ HP Lexus isF. Tracy On Tue, Jan 6, 2009 at 11:40 AM, wrote: > Michael, > The SuperTrapp was a "fair" invention that bankrolled Mollers early > efforts at the Skycar. He sold the company and then had to dupe investors to > fund 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. 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< /A> > *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. > > > > ------------------------------ > Get a *free MP3* every day with the Spinner.com Toolbar. Get it Now. > > ------=_Part_193229_32679842.1231262337318 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Always wondered what the real story was on SuperTrapp performance because of all the conflicting reports.  Just as an anecdotal SuperTrapp report, I took a racing course a few days ago at Sebring (Skip Barber Racing) and the pace cars were race preped Mazda Speed MX-5s with SuperTrapp mufflers.  They had a very acceptable exhaust noise level and performed well.  I didn't hear them when removed but  I was told that without the SuperTrapps they were well beyond the race rules for noise.  I was amazed that they would accelerate out of the turns as well as all the cars we drove except for the 450+ HP Lexus isF.  

Tracy


On Tue, Jan 6, 2009 at 11:40 AM, <wrjjrs@aol.com> wrote:
Michael,
 The SuperTrapp was a "fair" invention that bankrolled Mollers early efforts at the Skycar. He sold the company and then had to dupe investors to fund 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 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: 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.

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

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