I saw some drawings on the web site for a tangential muffler. I really like the compact size of the design. Has anyone built one of these? How well does it work? How does it effect engine performance vs. a set of tuned long tube headers? I really don't want to route a long exhaust system under the plane.

If anyone has sound clips that would be great.


Chad Peterson


The rotary is really hard on a muffler. The tangential muffler does not work all that
well and it must be made with relatively  thick .062" 321 stainless steel or very expensive
.049" thick Inconel. It is not a pleasant sound. It has more back pressure than a coax.

It is quite heavy and keeps a lot of heat in the engine compartment making the
engine harder to cool. It is best to get the heat out as quickly as possible.

That is just a fact of life with an non turbo charged rotary. Turbo rotaries are
quiet enough with out a muffler.

The coax can be a simple U shape fastened to the lower skin of the fuselage properly
insulated of course.

Paul Lamar

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