Stability of Gliding Flight of a Swallowtail Butterfly

摘要

OKAMOTO et al. [1] recently analyzed the flight stability of thenlateral-directional motion of a swallowtail butterfly Pupilionxuthus. Their analysis showed that a swallowtail glides with a highndihedral angle due to the stability of the spiral mode and that thenrelation between a dihedral angle and the stability of the Dutch rollnmode is strongly affected by Re. In the present analysis, the flightnstability of the longitudinal motion of the same swallowtail isnanalyzed to investigate the stability of the longitudinal motion at anhigh dihedral angle. Furthermore, the flight stability of the lateral-ndirectional motion of the same swallowtail will be analyzed again. Anmain improvement from the previous analysis is the measurement ofnthe pitching moment with high accuracy. The effects of Re on all thenmodes of the longitudinal and the lateral-directional motions will beninvestigated.