This to me makes the most sense for a muffler if you are
 going to come out the bottom of the airplane.

 Simple and durable as there is nothing to melt inside
 a conventional muffler. There is a ball joint between these
 pipes and the down pipes from the engine.  As I recall these are
 0.035 wall 304 stainless steel. Correct me if I am wrong Ed.
 Somebody suggested a range of hole sizes might work better than
 all one hole size.

 If you need a bit more quiet a larger pipe positioned concentric with

these

 open in the front and rear  for cooling air flow should work well.
 Nobody has tried that yet to my knowledge.

 Paul Lamar

Paul
What are your thoughts on this for a composite plane, like the KIS

Bill Schertz
KIS Cruiser #4045

It should work well but probably be spaced a little further away from the
bottom of the fuselage. Would not hurt to put some shiny .016 or .020 stainless
on the bottom of the fuselage above the exhaust pipes.

Paul Lamar
 
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