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After about 700 hours and 8 years flying I have
decided to design and build a new exhaust system for my RV-7A powered by a 4
port RX 8 Renesis engine. Bobby Hughes has offered advice and greatly
assisted me in this endeavor.
The new exhaust was designed with three header
pipes routed into a 3 to 1 collector that is 3 inches in diameter.
The headers and collector direct the exhaust toward the firewall. A
combination of 3 inch and 2.5 inch pipe take the exhaust down and out the bottom
of the cowl and the exhaust exits about 12 inches back from the
firewall.
I have flown with the new exhaust and discovered it
causes a lot more vibration to the airframe than the old exhaust. (I have
a ball joint in the down pipe at the firewall). I want to add a flexible
joint down stream of the 3 to 1 collector and have about 3 inches space for
it. MY Question - Has anyone used a flex coupling or a
flex bellows as seen on Summits web site? The flex coupling is a woven
stainless joint with a liner inside and weldable ends. The flex bellows
looks like a metal bellows on the outside and has a slip joint built
inside.
Anyone have any experience with these on the
rotary?
Thanks,
Dennis Haverlah
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