Nowadays, Airfoil shape optimization are developed by many researchers. Especially, evolutionary method is taken to find out the shape of airfoil. The main objective work is finding the shape of airfoil that get the aerodynamic properties which good for lift and drag of the aircraft wing. PSO is the evolutionary method that used for this work. The work are combination between the CFD analysis as Reynolds number 550,000 and optimization technique to get the airfoil shape that maximum lift to drag ratio. The result is compared with the standard NACA 2412 airfoil. The optimization airfoil has improved lift to drag ratio compared to the standard NACA 2412 airfoil for 53.22%. Airfoil shape optimization Airfoil shape profile. The airfoil profile can be generated by setting the point variables and make it continuously by using the spline interpolation. The NACA2412 airfoil shape is created by using the seven points as shown in the Fig. 1. The four points at the lower and upper part of airfoil are assigned as the seven of design variables. The leading and tailing edge are fixed in the same y direction that equal to zero and x direction are assigned equal one and zero, respectively. The spline interpolation is
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