Discussion
The chord of an airfoil is measured from
Answer: A
Correct answer: Leading edge to trailing edge
The chord is the straight line from the leading edge to the trailing edge, and it is the reference length for the whole section: thickness and camber are quoted as percentages of it, angle of attack is measured from it, and Reynolds number is based on it. The distance from root to tip is the span, which belongs to the wing rather than the section.
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