A rotorcraft is a heavy airborne machine that works by generating lift caused by its wings, which are called rotary wings or rotor blades. Several rotor blades are fixed and rotate around the pole to generate the lifting force to overcome the gravity pull and the weight by generating the required uplift pressure and providing direction through forcing down the oncoming air. The major advantage of a rotorcraft is that it can hover at a location. Gyroplanes are used for low speed surveillance oper 更多
