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The installation of longer exhaust pipes resulted in a more powerful engine
and more exhaust noise, more aggressive noise.
In an effort to control exhaust noise I am experimenting with exhaust noise
suppressors.
When I received those exhaust noise suppressors from the vendor, they
consisted of a perforated tube and three perforated disks welded on the tube
(the three center disks in the photo). The disks are 2" in diameter, and the
whole contraption looked and is too flimsy for rotary engine use. After 15
minutes in the rotary exhaust pipes, some of the disks were bent and some of
the welds were failing. I repaired? and modified by adding a 1/16" thick
disk at each end of the tubes and brazing welding rods to tie together all
five disks. After 1/2 hour of flight, the suppressors were again damaged.
Brazing, even nickel based brazing rods will not resist long the rotary
exhaust. I reinforced the ends disks with 1/8" thick perforated disks, arc
welded.
The photo does not show the 1/8" thick reinforcement disks.
I am still testing this arrangement (on the ground).
Yvon Cournoyer
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