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What is the graph that is represented in the airfoil section?

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in Aerodynamics by (773k points)
What is the graph that is represented in the airfoil section?

(a) Lift-moment ratio

(b) Coefficient of lift-coefficient of drag ratio

(c) Angle of attack-drag ratio

(d) Lift–angle of attack ratio

The question was posed to me in quiz.

The question is from Airfoil Characteristics in portion Incompressible Flow over Airfoils of Aerodynamics

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Right option is (b) Coefficient of lift-coefficient of drag ratio

To elaborate: The characteristics of any particular airfoil section can conveniently be represented by a graph, showing the amount of lift and drag obtained at a various angle of attack, the lift-drag ratio, and the movement of the center of pressure. With these graphs, we can choose suitable airfoil for the aircraft.

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