The shape of a symmetrical four-digit NACA airfoil is described by the equation
y = ± tc/0.2[0.2969 ˆšx/c €“ 0.1260x/c -0.3516(x/c)2 + 0.2843(x/c)2 €“ 0.1015(x/c)4
where c is the cord length and tis the maximum thickness as a fraction of the cord length (tc = maximum thickness). Symmetrical four-digit NACA airfoils are designated NACA OOXX; where XX is l00t (i.e., NACA 0012 has t = 0.12). Plot the shape of a NACA 0020 airfoil with a cord length of 1.5 m..

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02 0.1 0.1 0.5 1.5