Abstract
In this study,it is clarified effect of center of flapping amplitude(CFA) for body angle on flapping flight without tail-plane.The average of body angle has negative correlation to CFA on flight of a flapping robot and two butterflies from results of observations for these flights.From this result,CFA is one of important factor for flapping flight.By using an equation of moment around flapping robot,it is considered that the body angle change is occurred by translation of application point of aerodynamic force due to CFA change.Moreover,the moment variation on CFA changing depends on point and direction of application of aerodynamic force and angle of attack.
