Thanks for sharing that info, Lynn....can you tell me how well the discs
held up to the rotary engine?  Thanks again.  Paul Conner

----- Original Message -----
From: <Lehanover@aol.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, December 01, 2004 3:38 PM
Subject: [FlyRotary] Re: New Muffler Design


> In a message dated 12/1/2004 10:12:42 AM Central Standard Time,
> sqpilot@bellsouth.net writes:
>
> << Hi, Ed....funny you should mention that....I was just considering
ordering
> a
>  Supertrapp disc muffler which sounds 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
>   >>
>
> I recommend ordering two extra sets of diffusers for the Super Trap. It
will
> kill the power, but does cut down the noise. When we ran at Charlotte
Motor
> Speedway we had to add on of those to get down to 105 dB. There is nothing
to
> absorb sound at that track. A NASCAR race must be amazing to hear. I think
those
> things started out as a spark arrestors for diesel trucks used in National
> forests.
>
> I think a conical shape in the exit would have been less of a drag than
the
> flat plate, but we never went back, so I didn't work on it anymore.
>
> Lynn E. Hanover
>
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