Airfoil Center of Gravity Rudder 
Pilot Institute
APRIL 12, 2025
They are designed with a special shape called an airfoil, which encourages passing air to turn and deflect downward. This is why the typical airfoil shape has a curved top and a flat bottom, especially in slower-speed general aviation aircraft. The aircraft pivots about its center of gravity. Wings do just that.
Plane and Pilot
OCTOBER 3, 2024
The airfoil is a Harry Riblett shape, giving modernized flow separation on the leading edge for a soft stall yet with good lift and drag performance. An elegantly simple rope system inside the fuselage raises and lowers the Gweduck’s water rudder mounted inside the base of the main rudder (right).
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