WIND-TUNNEL INVESTIGATION OF EFFECTS OF TAIL LENGTH ON THE LONGITUDINAL AND LATERAL STABILITY CHARACTERISTICS OF A SINGLE-PROPELLER AIRPLANE MODEL

摘要

An investigation has been made of a powered model of a single propeller low-wing airplane with three values of tail length and three horizontal tails to determine the effects of tail length and tail volume on the longitudinal and lateral stability.nThe destabilizing shift in neutral point caused by power increased with increasing tail length for either the condition of constant horizontal-tail volume or constant horizontal-tail area. For a given tail length, the destabilizing shift in neutral point caused by power increased with increasing tail area. The increase in directional stability caused by power became larger as the tall length was increased. The tendency toward rudder lock decreased as the tail length was increased in the positive yaw range but was practically unaffected by tail-length variations in the negative yaw range.