For a nonsymmetrical airfoil, how does the lower camber compare to the upper?

For a nonsymmetrical airfoil, how does the lower camber compare to the upper?

• A. Different from upper
• B. Identical to upper
• C. No camber
• D. Lower camber is greater than upper camber

Answer: (C)

Camber is the offset of the airfoil’s mean line from the chord line—the amount the shape curves away from a straight line connecting the leading and trailing edges. It’s a single value describing the whole airfoil, not two separate values for the upper and lower surfaces. The upper and lower curves are arranged around the mean line, with the surfaces diverging from it in opposite directions, but camber itself isn’t split into “lower” and “upper” quantities. In this framing, there isn’t a distinct lower camber versus upper camber to compare, which is why camber isn’t described as a per-side difference.

Camber is the offset of the airfoil’s mean line from the chord line—the amount the shape curves away from a straight line connecting the leading and trailing edges. It’s a single value describing the whole airfoil, not two separate values for the upper and lower surfaces. The upper and lower curves are arranged around the mean line, with the surfaces diverging from it in opposite directions, but camber itself isn’t split into “lower” and “upper” quantities. In this framing, there isn’t a distinct lower camber versus upper camber to compare, which is why camber isn’t described as a per-side difference.