I stopped off in Michigan and met C. Smith at
his hangar. He is building a P-port rotary powered Zenith 601.
Here is a shot of his square tube exhaust manifold.
This will be the start of a tangential muffler.
Note the English wheel. Brian Trubee will not have the
only aluminum cowl :)
C. Smith came up with some cute Minihelc pressure gages.
These are super sensitive at only 2 inches of water full scale.
I was unaware they made them this small.

Paul Lamar