Discussion
Assertion (A): Low wing aeroplanes show more visible dihedral than comparable high wing types.
Reason (R): Fuselage interference in sideslip helps a high wing and hinders a low one.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the reason for the first. In a sideslip the fuselage deflects the flow, and the sense of that deflection depends on where the wing is mounted: a high wing gains, a low wing loses.
A low wing design must therefore supply more of the effective dihedral geometrically, and the angle shows on the drawing. High wing types frequently need almost none, and some carry slight anhedral. The two arrive at similar handling by different routes, which is what the visible difference conceals.
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