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
>
>
>
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