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Which of these is not suitable for helicopter blade?

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in Aerodynamics by (773k points)
Which of these is not suitable for helicopter blade?

(a) Moderately hick airfoil

(b) Thin airfoil

(c) Small pitching moment

(d) Unsymmetrical airfoil

I got this question during an interview for a job.

My question comes from Blades and Propellers in division Helicopter Dynamics of Aerodynamics

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Best answer
The correct choice is (d) Unsymmetrical airfoil

Explanation: The rotor blade for a helicopter has small pitching moment. Apart from this, it is moderately thick and symmetrical which remains same throughout the wing span because it is easy to construct. The reason for symmetrical airfoil is that it yields zero pitching moment. The most common airfoil used in helicopter blade is NACA 0012.

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