Abstract
The insect obtains driving force and lift force by flapping. The dragonfly changes its flapping state of four pieces of wings according to flight conditions. The wing performance of the robot dragonfly which was able to fly was measured in order to grasp its flight states in a wind tunnel. The followings were obtained by this study: Unsteady lift forces by flapping wings were confirmed to be about three times larger than those of fixed wings. The aerodynamic performance was varied by the phase difference of fore and hind wings. Lift force exceeding the body weight was obtained in flapping phase angles of the hind wing advancing for the forewing at the time of -90° and 0°. Chronological aerodynamic performance in flight conditions were obtained to analyze the phase difference of fore and hind wings.
