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What is the shape of the airfoil at the leading edge?

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in Aerodynamics by (773k points)
What is the shape of the airfoil at the leading edge?

(a) Semi-circular

(b) Curve

(c) Straight

(d) Circular

This question was addressed to me during an internship interview.

The origin of the question is Airfoil Nomenclature in section Incompressible Flow over Airfoils of Aerodynamics

1 Answer

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Best answer
Correct option is (d) Circular

Easy explanation: The shape of the airfoil at the leading edge is usually circular with a leading edge radius of approximately 0.02c. The shape of all standard NACA airfoils are generated by specifying the shape of the mean chamber line and then wrapping specified symmetric thickness distribution around the mean camber line.

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