Respuesta :
A sweptwing airplane with weak static directional stability and increased dihedral causes an increase in Dutch roll tendency. Option B.
Increasing speed increases the air flowing over and under the wing. An increase in the relative wind influence on the underside of the wing creates a large amount of air that is deflected downward, creating more lift. This is because the outer wing travels a longer distance than the inner wing, but both complete their rotation in the same amount of time.
As a result, the outer wing flies faster than the inner wing creating more lift. Since the bottom surface of the airfoil has a larger radius of curvature than the top surface, lift begins to increase with the angle of attack. Therefore the pressure gradient is downward. This means that the lower surface has a higher pressure than the upper surface and the wing receives a lift.
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