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.
Read more about this topic: Powered Lift
Famous quotes containing the word compound:
“Put God in your debt. Every stroke shall be repaid. The longer the payment is withholden, the better for you; for compound interest on compound interest is the rate and usage of this exchequer.”
—Ralph Waldo Emerson (1803–1882)