Once you tell us more, I can become more specific. Generally, you look at all requirements and then select or design the airfoil according to the desired pressure distribution at different angles of attack and Mach numbers. What construction technique is used for the wing? Wooden frame and fabric? All metal with countersunk or exposed rivets? To be built on a jig or on a flat table? Composite, in a mold or positive over a foam core? All of them have subtle consequences for airfoil selection. The present study introduces a low Reynolds number (Re) airfoil family for the entire blade span of small wind turbines, aiming to reduce the effects related to laminar separation, improve startup response and meet acceptable levels of structural integrity.What is the desired stall behaviour? Docile (as preferred for training aircraft) or snappy (as preferred for aerobatic aircraft)?.If the aircraft is small: What Reynolds number is flown at which lift coefficient?.What is the lowest cruise lift coefficient and the highest lift coefficient for a clean wing and with flaps down? Does your design need flaps at all?.

However, if you want to operate your design at high subsonic speeds, thickness needs to be controlled. The numerical simulation of low speed and high-lift airfoil has been done using ANSYS-FLUENT (version 16. The method used for analysis of airfoils is Computational Fluid Dynamics (CFD). What is the maximum airfoil thickness you can afford? A thicker airfoil makes for a lighter wing with more internal volume for flaps and fuel. suitable airfoil design to be used in the low speed aircrafts.But since there is plenty of literature on them, they are a good start. You need to be more specific with your requirements, and yes, NACA airfoils will most likely not be the best choice.

So you know your wing planform and look for the right airfoil.

Low speed airfoil