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Q:

What is the effect of dihedral wings on lift?

A:

Whether a plane has dihedral (at an upward angle) or anhedral (at a downward angle) wings they seek to maintain the plane’s stability when the plane rolls.  Wing dihedrals create “inherent stability,” which allows the plane to right itself after rolling.  If a plane has more dihedral, its stability will increase, but lift will decrease and drag will increase.