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A rotor is the rotating part of a helicopter which generates lift, either vertically in the case of a main rotor, or horizontally in the case of a tail rotor.
Before the development of powered helicopters in the mid 20th century, autogyro pioneer Juan de la Cierva researched and developed many of the basics of the rotor. Cierva is credited with successful development of multi-bladed, fully articulated rotor systems. This type of system is widely used today in many multi-bladed helicopters.
The rotor head of a Sikorsky S-92
A decorated Japanese taketombo bamboo-copter. The toy consists of a rotor attached to a stick.
The first autogyro to fly successfully in 1923.
The simple rotor of a Robinson R22
Robinson R44 rotor head
Semirigid rotor system
Antitorque: Torque effect on a helicopter
Tail rotor of an SA 330 Puma
Fenestron on an EC 120B
Diagram showing the movement of air through the NOTAR system
Boeing CH-47 Chinook
Kamov Ka-50 of the Russian Air Force, with coaxial rotors
HH-43 Huskie
Mi-12
de Bothezat helicopter, 1923 photo
