In order to investigate the effects of propeller operation on the longitudinal aerodynamic characteristics of a pusher-type airplane, wind-tunnel study with a scale model was carried out in a subsonic wind-tunnel. Also longitudinal aerodynamic characteristics with power off and power on is estimated based on semi-empirical and empirical methods available. Thrust, lift, drag and pitching moment coefficient curve are obtained. To characterize the propeller performance, propeller calibration is also carried out. For a very low scale propeller, it is observed that the thrust coefficient does not follow the tendency of conventional propeller thrust curves. It is found that lift curve slope and maximum lift coefficient increase as thrust coefficient increases, and static longitudinal stability is not deteriorated by the effects of power. Estimating longitudinal aerodynamic characteristics, we find that it is crucial to consider the effects of body wake on the horizontal tail due to the geometrical shape of the pusher-type airplane.
