Tony, based on that preliminary sketch - it appears you have the basics there.  The only thing I notice which at this point that I would change  is you appear to have the inlet flush against the bottom of the fuselage where it will easily ingest the aircraft skin boundary layer.  Most inlets so mounted are generally mounted an inch or so away from the fuselage to avoid this.

In fact, given the apparently length of your inlet from your sketch , you should have little problem with the length of a full up Streamline duct - which according to K&W was the best they could find for subsonic flow.

Ed



It's hard to see in the pic but behind the RAD is the muffler. I really like the exhaust diffuser idea. From what I understand air will allways flow thru the RAD as long as the engine is running. Do have that correct?