Looking at my idea for a tangential exhaust, a few things come to mind. One is that the inside radius of the exhaust runners get smaller the more you increase the twist. Additionally, I intend to have the centerline of my muffler directed down and away from the longitudinal centerline of the airplane. I'll design a muffler system for an RV-4. You can expect drawings in a few days.
Brian Trubee
Redmond, Wa

 
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