Charlie,
It looks like it would make a nice aerodynamic shaped muffler.  The only problem that I see is making sure the cone stays in place inside the casing.  If it comes loose, it could move back and plug the conical outlet.  We have been shown, keeping stuff in place inside the Rotary exhaust is like me trying to keep smoke inside some of my kit built radio equipment

Bob Perkinson

-------------- Original message ----------------------
From: Charlie England <ceengland@bellsouth.net>
>
> While re-perusing an old article to answer a question on another list, I
> noticed something about coanda nozzles that might be of interest to
> rotary fans. It mentions that while there is no performance increase, it
> does seem to 'mellow' the exhaust sound. I wonder if this might survive
> the rotary pulses better than other pulse breaking techniques & help
> take the edge off the rotary bark. (Although it might be a moot point if
> everyone adopts Dennis Haverlauh's system for the Renesis.)
>
> http://cafefoundation.org/v2/pdf_cafe_reports/EPG%20PART%20IV.pdf
>
> Charlie
>
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