The simple KF airfoil shape lends itself well to construction in foam resulting in an easy to build wing that often has improved performance and handling characteristics compared to the'flat plate' wing often used in foam radio controlled models.
The simple KF airfoil shape lends itself well to construction in sheets of various plastic foams, typically expanded polystyrene (EPS) or expanded polypropylene (EPP). The resulting stepped wing can have improved performance and flying characteristics compared to the even simpler'flat plate' wing used in some radio-controlled models.