B-17 wing leading edges have six ports or intakes on each wing. I would guess that three are for each engine. What are the functions of each?
Where do they vent? With those big scoops the air has to exit somewheres. I recall that the four slot-like vents on the upper surface of the wings behind each engine was something about venting fuel tanks.
I saw in a training film that the engines air intakes were inside the wing and not a ram-air intake.
Is one intake for the supercharger intercooler?
Model kits just leave open holes into the wing with no details. None of the aviation books I have show that kind of detail.