Edward Klepeis wrote:

Dear Paul
Here is what Jeerys muffler looks like any comments good or bad
etc. It's built out of 321 s.s except for the end caps and mounting
flange.

Regards

Ed

Looks great Ed. Should simplify under the cowl greatly.

Ops forgot to send the pictures.

Paul Lamar

It does look great.  Ed is an exceptional craftsman.  I am really
looking forward to bolting this on  my engine.   I wish there was a
running rotary project near by to test it on.   Anyway,  this is a zero
back pressure muffler.  The area of the tailpipe  is greater than the
area of the two  exhaust pipes.  At no point is the flow of exhaust gas
restricted.   The exhaust gas, it is hoped, will slow down and become
disorganized inside the  muffler.  That should quiet it down.  The cool
tube should cool it down.  This exhaust system will not conflict with
the Schertz Beam engine mount.  It clears the intake runners with
plenty of room.   The tailpipe exits the cowl at the 4 o'clock
position, well away from the rad and oil cooler mounted  underneath.
The exhaust pipes are fully welded on the back side of the exhaust
flange and tack welded on the outside to allow room for differential
heat expansion.         Jerry

Paul
Is a muffler needed after a turbo application?

Doug in Japan

It is debatable. There is so much prop noise one may not notice
any difference. The thing about the rotary sound is it is so
much different than the sound an airplane usually makes therefore it
draws attention. If you use a VU meter it is hard to quantify a 
significant difference in actual volume. I think we have grown so used
to hearing light planes we tend to ignore them. When we hear a rotary
our collective ears perk up. I think if you silence the engine completely
the prop noise would still be very significant. The trend in Europe
is to use lower prop tip velocities AND have extensive under the
fuselage mufflers. A lot also depends on the angle you
are hearing it. When Tracy flew towards the finish line at 220 plus MPH 
and 500 feet during the Sun 100 race one could not at first tell it 
was a rotary engine. Only when he had passed overhead could one 
tell it was a rotary.

Paul Lamar
 
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