Another benefit which I neglected to mention is the fact that with my duct design, I will entirely eliminate fuel lines from the cockpit. The fuel lines will run below the cockpit the outter skin of the fuselage, in a dead space between the duct and fuselage. Same goes for the coolant lines, of course.  I don't have to do all sorts of gymnastics to get the rad to fit in the engine compartment, or make compromises with the one system over the other to get them all to fit. There is a little more latitute to optimise other things in the engine compartment. There is some addtional wetted area associated with having a scoop, but I am ommiting the cowl cheeks. If the plane is a little draggier, then so be it. It's more important to me to be absolutely sure I don't have any cooling problems. Maybe I'm giving up a few mph on the top end, maybe not.

 
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