A thin airfoil is defined as NACA 0009 is at ɑ = 5°. What is the value of lift curve slope?

A thin airfoil is defined as NACA 0009 is at ɑ = 5°. What is the value of lift curve slope? Correct Answer 2ᴨ per rad

Given, NACA0009 airfoil, AOA ɑ = 5° As mentioned the airfoil is thin. Hence, thin airfoil theory can be used. According to thin airfoil theory, for thin airfoil, Lift curve slope = 2π 1/rad = 0.11 1/degree.
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