直升机低速飞行特性与意外右偏航

HELICOPTERS LOW SPEED FLIGHT CHARACTERISTICS AND UNANTICIPATED RIGHT YAW

根据国外有关参考资料，对直升机丧失尾桨推力导致意想不到的右偏航进行了讨论分析，简单介绍了直升机低速飞行时的四种飞行特性（风标稳定性、尾桨涡环状态、主旋翼桨盘旋涡影响、丧失前飞升力）在意外右偏航中的作用和特点，以及改出方法和实施改出的应急措施。为飞行人员保证飞行安全提供了参考依据。

Loss of tail rotor thrust for a helicopter can catise an uncommanded rightyaw.A single rotor helicopter reveals an unanticipated right yaw at airspeeds less than55.5 km/h under certain conditions such as Weathercock stability,Tail rotor vortex ringstate,Main rotor disc vortex interference and Loss of translational lift,which can resultin the loss of aircraft control unless suitabble corrective action is taken by the pilot.