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If I want to locate my minimum pressure at 0.5 of chord c then _____________

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If I want to locate my minimum pressure at 0.5 of chord c then _____________

(a) NACA 6512

(b) NACA 652132

(c) NACA 65211

(d) NACA 0009

This question was posed to me in my homework.

Question is taken from Airfoil Selection-3 in section Airfoil and Geometry Selection of Aircraft Design

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Correct answer is (b) NACA 652132

For explanation I would say: NACA series is used to identify airfoils as per our requirement. NACA -4 and -5 digit series are not used to provide a minimum pressure point. NACA 6 digit series is used for such operations.

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