" Bobby Hughes said he had seen data indicating a wedge duct had the
highest pressure near the end of the wedge and lower pressure near the
opening."


I can't find the post but maybe someone else has it or remembers who
posted it. Could have been on PL's listed also. If I remember correctly a one inch square grid was mapped and measured
on the backside of a radiator. The top side was a wedge of some sort. I
do not remember if the measurements were pressure or airspeed. The data
indicated that more air was flowing through the core at the narrow end
of the wedge and less air as the wedge opened up toward the source. Bobby