Wing and method for improving control efficiency of two-dimensional airfoil rudder surface

A method for improving a control efficiency of a two-dimensional (2D) airfoil rudder surface, comprising:

• step 1:
• determining a rudder surface efficiency of an original symmetric airfoil rudder surface;
• step 2:
• replacing the original symmetric airfoil rudder surface with an asymmetric airfoil rudder surface of equal or greater rudder surface efficiency;
• step 3:
• translating the asymmetric airfoil rudder surface downward and in a leading edge direction of a main wing, allowing the same to be misaligned with the main wing to generate a misalignment gap, and determining a rudder surface efficiency at a current misalignment position;
• step 4:
• repeating step 3 to determine a misalignment position with an optimal rudder surface efficiency;
• and
• step 5:
• changing, in a case that a rudder surface control efficiency fails to meet control requirements, a position of a rudder surface relative to the main wing, allowing the rudder surface to be translated to the misalignment position with an optimal rudder surface efficiency.