Aerodynamic forces and moments of a flexible delta wing in pitching motion were experimentally studied in a low-speed wind tunnel. The pitching motion of the delta wing was carried out smoothly and periodically by means of a manipulator equipped with six stepping motors, which were controlled by a microcomputer. The objective of the research is to analyze dynamic characteristics of the flexible pitching delta wing comparing with those of a hard delta wing made of aluminum without its deformation in a flight. Appropriate bending of a flexible delta wing brings a high lift owing to a strengthened leading edge vortex by an increase of effective angle of attack and a high pressure on the windward side of the delta wing.
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