The rotor system, or more simply " rotor ", is the rotating part of a helicopter that generates lift . A rotor system may be mounted horizontally, as main rotors are, providing lift vertically, or it may be mounted vertically, such as a tail rotor, to provide horizontal thrust to counteract torque from the main rotors.
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Such a hybrid craft is still heavier than air, which makes it similar in some ways to a conventional aircraft . The dynamic lift may be provided by helicopter-like rotary wings ( the " rotastat " ), or a lift-producing shape similar to a lifting body combined with horizontal thrust ( the " dynastat " ), or a combination of the two.
