Abstract
Stability of wing moving near ground wall is very complex because of ground effect. We investigate dynamic characteristics of wings in ground effect with pitching motion by wind tunnel experiments. As a result, in the case of lift force type, conditions that Venturi effect does not occur are required for the sake of stable flight near ground. In the case of down force type, when positions of center of pressure are located forward, dynamic down force occurs strongly than static down force, however, certain type of wing leads unstable down force. Wing that center of pressure is located forward and down force is produced stably, is required.
