See it like this:
– Imagine a slice of air traveling around the body shape of the airplane. When it reaches the section containing the wings, there is a sudden increase in the value of the section. To compensate for that increase and stay in the limits defined by the area rules (a sinus something increase), the fuselage shape have to be narrowed to balance for the section increase (ex. the F106).
Which is one of many CFTs design problemss… (apart from being positioned on the extrados, therefore dgrading aerodynamics))
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