Discussion
A low wing aeroplane typically requires more geometric dihedral because
Answer: C
Correct answer: Fuselage interference works against it
In a sideslip the fuselage deflects the flow, and the direction of that deflection depends on where the wing is mounted. On a high wing the flow is pushed up under the lower wing and down over the upper one, adding to the dihedral effect. On a low wing the same mechanism works in reverse and subtracts from it.
So a low wing design must make up the deficit with geometric dihedral, which is why low wing light aircraft show a visible dihedral angle where high wing types often show almost none.
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