I understand how an aeroplane works, with the wings deflecting air downward and thus creating a lift force. I understand how a helicopter works, with the rotor pushing air downward and thus creating a lift force. However, I do not understand how gyroplanes, with a backward-tilted unpowered rotor, generate lift. By my understanding, forcing air through the rotor from underneath should make it rotate in a sense that would draw more air into it from underneath, creating a lift force pointing downward. So how does a gyroplane function? Does it use cyclic pitch to finagle the rotor into going the other way, or is there something else I've missed? Thanks in advance.