Question

Why NACA 0012 airfoil is said to be symmetric airfoil?

(a) Because of no camber

(b) Because of camber

(c) Because of no thickness

(d) Because of chord line

I have been asked this question by my school principal while I was bunking the class.

This interesting question is from Airfoil Nomenclature in chapter Incompressible Flow over Airfoils of Aerodynamics

Answer 1

Correct choice is (a) Because of no camber

Easy explanation: The NACA 0012 airfoil indicates the symmetric airfoil, because an airfoil with no camber, that is with the camber line and chord line co-incident in an airfoil is called a symmetric airfoil. For the NACA 0012 airfoil is with a maximum thickness of 12%.