Camber is the curvature of an airfoil above and below the chord line.

• A. Camber
• B. Wingspan
• C. Aspect Ratio
• D. Dihedral

Answer: (A)

Camber is the curvature of the airfoil’s mean line relative to the chord line. It measures how far the mid-surface of the airfoil (the mean camber line) deviates from a straight line drawn along the chord. This deviation determines how the airfoil generates lift; positive camber means the mean line curves above the chord (typically increasing lift at a given angle of attack), while zero camber corresponds to a symmetric airfoil with no mean-line curvature. Thickness, by contrast, describes the distance between the upper and lower surfaces and is a separate characteristic.

The other terms describe wing planform or structural features rather than the cross-sectional curvature. Wingspan is the distance from tip to tip; aspect ratio relates span to wing area; dihedral is the upward angle of the wings from root to tip.