直升机自卫时有许多有利条件,通常它们在地杂波中很难被发现,而且灵活、体积小、容易隐蔽,简便又能减少被发现的可能性。 不足的是,在一定距离内直升机飞行噪声传得很远,这样敌人就有了准备反击的时间。另外旋翼闪烁(曲翼片旋转而引起的雷达反射现象)也是一个需要解决的问题。为此美国轻型直升机计划(LHX)要求尽可能采用雷达吸波材料(RAM)制作旋转翼片。 除了需要解决噪声和旋翼闪烁问题外, Helicopters have many advantages in self-defense. Usually they are hard to find in ground clutter, they are flexible, small in size, easy to conceal, simple and reduce the possibility of being discovered. The downside is that the helicopter flight noise is so far away from within a certain distance that the enemy is ready to fight back. In addition, the rotor flashes (curved wings caused by the rotation of the radar reflection phenomenon) is also a problem to be solved. To this end, the U.S. Light Helicopter Program (LHX) requires the use of Radar Absorbing Materials (RAM) as much as possible to make rotor blades. In addition to addressing noise and rotor flicker issues,