![]() ![]() S: a single digit indicating whether the camber is simple (S = 0) or reflex (S = 1),.P: a single digit for the x coordinate of the point of maximum camber (max.L: a single digit representing the theoretical optimal lift coefficient at ideal angle of attack CLI = 0.15 L (this is not the same as the lift coefficient CL ),. ![]() The NACA five-digit series describes more complex airfoil shapes. The 15 indicates that the airfoil has a 15% thickness to chord length ratio: it is 15% as thick as it is long. The NACA 0015 airfoil is symmetrical, the 00 indicating that it has no camber. ![]()
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