Abstract
The purpose of our study is to develop a takeoff system for a Micro Air Vehicle (MAV). We observed the takeoff sequence of a butterfly from ground, that is, motion of wings and body, taken by a high speed camera. The acceleration in the x and y direction became the maximum when the angle of a butterfly was 60 degrees in the down-stroke phase. Whereas, the acceleration in the x direction became the maximum in the up-stroke phase. We described the relation among flapping and angles of attack of the body in this paper. We indicated the down-stroke vortex is important for lift and impellent force and up-stroke vortex for impellent force.
