Discussion
For a general aviation airplane, which one of the following has a destabilizing effect on its static roll stability?
Answer: C
The destabilizing feature is a fuselage with a low wing.
Static roll (lateral) stability comes from the dihedral effect: in a sideslip the airplane should develop a rolling moment that lifts the wing towards the sideslip. With a low wing, the cross-flow around the fuselage in a sideslip pushes air down onto the upwind wing root and up behind the fuselage onto the other, reducing the upwind wing's angle of attack. This produces a negative dihedral effect.
A high wing does the opposite and adds to roll stability. Positive dihedral and wing sweepback are the standard ways of increasing the dihedral effect, so they are stabilizing, not destabilizing.
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