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How is supercritical airfoil different from the NACA 64 series airfoil?

How is supercritical airfoil different from the NACA 64 series airfoil? Correct Answer Flatter top surface

The supercritical airfoils have a flatter top surface compared to the NACA 64 series airfoil. This leads to lesser local Mach values at the top even when it is at supersonic speed. In turn, there is a weaker terminating shock leading to less drag.

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