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The weather was so good I managed to paint my fuselage and finally removed the exhaust heat shield to take pictures.
The exhaust manifold is stock RX-8 cut off about 2 inches past the last rotor. The exhaust comes out toward the front of the aircraft. To turn the exhaust 180 degrees I first went into a 4 inch dia. cross tube . The exhaust enters tangentially to the 4 in. cross tube and circles or swirlls as it goes out into the muffler. The cross tube is sealed using flat stainless steel. I had this built before the discussion by Lynn about using convex end caps! To help keep it together I had my welder install a 3/8 in. SS rod through the center of the two end caps. This ties them together. Only time will tell if this will work. I can say that the Renesis exhaust is not nearly as sharp as an RX-7. The fabricated parts of the exhaust are 302 SS .063 in. thick I believe. The outlet of the 4 inch cross tube is a flexable ball/socket fitting from the local muffler shop. The muffler is a Flowmaster -Hushpower II "The Resonator" part # 12512400 with 2.5 inch inlet and outlet. The muffler outlet gos into a 2.5 inch. SS pipe that was purchased and fabricated at the local exhaust shop. It also is 302 SS .063 in. thick.
Everyone that has heard the engine run comments that the exhaust is much quiter than the prop and the exhaust notes are quite low pitched.
Dennis H.
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