Thanks for the info, Ed....One point of interest is that I have the stock
cast iron manifold inbetween the engine and my tailpipe. It would seem that
the cast iron manifold is absorbing a lot of impulses, because everyone who
has heard my engine run states that it is not that loud.  Perry Mick
mentioned that he has a standard exhaust pipe following his cast iron
manifold as well, and has had no problems with it in the few hundred hours
he has flown with that setup.  (He told me that when I was inquiring about
the need for stainless exhaust pipe after the cast iron manifold).  Don't
know how much energy the cast iron absorbs, but it definately absorbs the
heat so the pipe doesen't get as hot.  Curious minds want to know.  Take
care.  Paul Conner

----- Original Message -----
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, December 01, 2004 10:25 AM
Subject: [FlyRotary] Re: New Muffler Design


> Hi Paul,
>
>  Have had not experience with Supertrapp mufflers although I have looked
at
> them several times.  I had at least one rotary friend that tried them and
> found them unsatisfactory - loud.  But, of course, they are "tunable" by
> inserting fewer or more discs - so could be he just did not have it tuned.
>
> I am uncertain about how well they would hold up - the rotary turbo
housings
> ( without using a turbo)  put out a pretty brutal shock wave and I have
had
> it break apart a mild steel insert into small pieces as well as fatigue
fail
> the metal at the end of my muffler tubes.  I know that Tracy had at least
> one of his home made mufflers fail due to the stress.
>
> However, perhaps some of the RX-7 drivers could give you some information
of
> how well they do.
>
> Ed
> ----- Original Message -----
> From: "paul" <sqpilot@bellsouth.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Wednesday, December 01, 2004 11:11 AM
> Subject: [FlyRotary] New Muffler Design
>
>
> > Hi, Ed....funny you should mention that....I was just considering
ordering
> a
> > Supertrapp disc muffler which soulds somewhat similar to what you are
> doing,
> > with the exception that it just attaches to the rear of your pipe.  The
> one
> > that I am interested in is the 3" diffuser disc unit, as seen on
> > www.http://recerpartswholesale.com/supert2.htm   One of my concerns,
> however
> > is how well it might hold up, as any parts/pieces of a failed unit would
> go
> > through my prop (pusher configuration), effectively cutting my flight
> short
> > and/or ruining my day.  Good luck with flight testing, etc.  Please keep
> us
> > posted.  Paul Conner
> >
> >
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>
>
>
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