Jerry Hey wrote:
     >
     > Paul,  here is one immediate result from attending the Rotary

Round Up.

     >
     > I want to change the exhaust system to prevent any possibility of
     > exhaust gasses flowing directly from the inlet port to the outlet

pipe

     > without tumbling inside the muffler.  Also,  I want  the exhaust

pipe

     > to exit  through the bottom of the cowl.   Here is a drawing of

what I

     > am proposing.  Please comment on it.   I like the fact that I can

make

     > the tailpipe out of sheet.      Jerry

     Looks good to me Jerry. Should work great.

     Paul Lamar

Looks good Jerry,
I saw the muffler for the newest Jabiru engine recently, very

interesting.

It is a tangential muffler, but there is one small change. There is one
"facet" or flat plate on the side just about where the exhaust hits out

of

the head pipes. The facet is about 1/6 of the perimeter of the tube.
The exhaust note is very quiet! While the pulses are not as loud as
a rotary to start with the muffling value of this setup is very good.
I stood parallel to the runway when the plane took off and it sounded
like a modern car going by in a hurry. More prop noise than exhaust.
Bill Jepson

Bill,
I just can't seem to visualise in my mind, what you are saying - a flat
plate restricting the exhaust flow, seems counter productive?
A small drawing would help!
George (down under)

 
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