A compound rotorcraft has both rotary and fixed wings (although in the USA, the term "compound rotorcraft" officially refers to a mixed powerplant system). Some types have a ducted rotor design, in which the rotor is surrounded by a large ring-shaped duct to reduce tip losses. The Ryan XV-5 Vertifan had non-tilt rotors in the wings.
In some designs, such as the Bell Boeing V-22 Osprey, the rotor swings forward to act as a propeller in forward flight. In others, such as the Fairey Rotodyne, a separate method of propulsion is used.
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