Discussion
A high wing contributes the equivalent of 4 degrees of dihedral and the geometry adds 1 more. A low wing version of the same design would lose the interference benefit and need
Answer: B
Correct answer: About 5 degrees of geometric dihedral
The high wing version has 5 degrees of effective dihedral in total - 4 from fuselage interference and 1 from the geometry.
A low wing version loses the interference contribution entirely, so the geometric angle must supply the whole 5 degrees if the same effective dihedral is to be reached. The reasoning explains a visible feature of light aircraft: low wing types show a pronounced dihedral angle while high wing types often appear nearly flat, both arriving at similar handling.
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