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

 
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