Which of the following is not correct for symmetric airfoil according to the fundamental equation of thin airfoil in transformed coordinates?(a) 0&leq;θ&leq;π(b) \(\frac {dz}{dx}\)=0(c) ξ=\(\frac {c}{2}\)(1-cosθ)(d) γ(θ)=0I had been asked this question in unit test.My doubt stems from The Symmetric Airfoil topic in chapter Incompressible Flow over Airfoils of Aerodynamics

Which of the following is not correct for symmetric airfoil according

1.	Which of the following is not correct for symmetric airfoil according to the fundamental equation of thin airfoil in transformed coordinates?(a) 0&leq;θ&leq;π(b) \(\frac {dz}{dx}\)=0(c) ξ=\(\frac {c}{2}\)(1-cosθ)(d) γ(θ)=0I had been asked this question in unit test.My doubt stems from The Symmetric Airfoil topic in chapter Incompressible Flow over Airfoils of Aerodynamics
Answer» The correct OPTION is (d) γ(θ)=0 Best explanation: The transformation for thin AIRFOIL theory uses ξ=\(\frac {c}{2}\)(1-cosθ) to make the COORDINATE transformation, where 0&leq;θ&leq;π. For a SYMMETRICAL airfoil (\(\frac {dz}{dx}\)=0), while γ(θ)=0 is not true for all VALUES of θ.

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