Hello Paul

I fired up the Renesis with the prop. on yesterday and was amazed at how
quiet it was. That spin [tangential] muffler design is a real winner, even though
mine has only two pipes going in at a tangent with the third going in at
the end, it still works.
The flanges shown in the picture were too narrow to fit the Mazda
gasket. Words were spoken!

Ian Beadle

Not to be confused with the Spintech muffler.

Some of that was due to the side exhaust ports and rectangular
tubes I am sure. The Russians discovered that rectangular
tubes were effective in quieting a rotary.

Paul Lamar ...No rotor no motor.

Ian,

this exactly how I am running the Single Rotor on the test stand. You can
improve the effectiveness still with minimizing the exit pipe size to the
point where it starts affecting performance.
We did a test at Tracy's test stand last fall, reducing the exit pipe after
some expansion. The pipe diameter was 1.25". The noise reduction surprised
everybody and the RPM loss was only 200 at 6500.

FWIW.

Richard Sohn
N-2071U


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