首页>
美国政府科技报告
>TAIL CONTRIBUTION TO THE DIRECTIONAL AERODYNAMIC CHARACTERISTICS OF A l/6-SCALE MODEL OF THE ROTOR SYSTEMS RESEARCH AIRCRAFT WITH A TAIL ROTOR
【24h】
TAIL CONTRIBUTION TO THE DIRECTIONAL AERODYNAMIC CHARACTERISTICS OF A l/6-SCALE MODEL OF THE ROTOR SYSTEMS RESEARCH AIRCRAFT WITH A TAIL ROTOR
This report presents the results of a wind-tunnel investigation to deter¬mine the tail contribution to the directional aerodynamic characteristics of a l/6-scale model of the rotor systems research aircraft (RSRA) with a tail rotor. No main rotor was used during the investigation. Data were obtained with and without the tail rotor over a range of sideslip angle and over a range of rotor collective pitch angle. The model with the tail rotor was tested at several advance ratios with and without thrust from the auxiliary thrust engines on the RSRA fuselage.nIncreasing the space between the tail-rotor hub and the vertical tail reduces the tail-rotor torque required at moderate to high rotor thrust. Increasing the exit dynamic pressure of the auxiliary thrust engines decreases the tail contribution to the static directional stability. The tail-rotor thrust and its interference provide a positive increment to the static direc¬tional stability. The tail contribution increases with forward speed. The adverse yawing moment of the airframe would strongly affect the thrust required of the tail rotor when the helicopter is hovering in a crosswind.
展开▼
