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Do I see correct but to me the roof channel seems to be wider at the front and narrower at the rear? If that's the case then it's not doing much in minimizing the frontal area but works as a vortex generator. The sharp corners of the channel also hints that way and the angle also seems to be quite close to 15 deg which is by many sources regarded as the optimal angle for a vortex generator. My not so educated guess is that the main function or this roof channel design is vortex generator while it also offers structural support.
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