Charlie is one of the most creative people I know.
He is a self taught engineer. He is one of the few people I know
that can compete effectively with Klaus Savier. Check out his Inconel
conformal muffler with conformal fish mouth. Charlie is  a fanatic when it
comes to light weight and low drag. The cowling shape is a continuous
perfect cone designed not to disturb the airflow going into the prop
in any way. Charlie also builds his own carbon fiber props.
I am not too fond of his carbon fiber intake manifold design
however he will discover that on his own once it flies.
Sorry Charlie :)

Paul Lamar