Discussion
A wing has 5 degrees of geometric dihedral and its sweep contributes the equivalent of a further 4. The effective dihedral is
Answer: C
Correct answer: 9 degrees
Effective dihedral is the sum of all the contributions to the dihedral effect, expressed as the geometric dihedral angle that would produce the same rolling moment:
\[ 5 + 4 = 9\ \text{degrees} \]
Sweep, wing position and the fin's side force above the rolling axis all contribute alongside the geometric angle. That is why a designer works in effective dihedral rather than in the angle visible on the drawing - and why a swept, high-mounted wing may need anhedral to bring the total back to what is wanted.
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