On a helicopter, the main rotor or rotor system is the combination of several rotary wings with a control system, that generates the aerodynamic lift force that supports the weight of the helicopter,
A Bell AH-1 SuperCobra with a 2-bladed semirigid main rotor
NOTAR helicopter with a rotorless tail
Tail Rotor of a Sea Lynx, the smaller tail rotor counteracts the torque of the spinning main rotor in many designs, although there are other solutions to this, such as having two counter-rotating main rotors
Looking up at CH-53G, which has 6-blades on its main rotor
A transverse-rotor aircraft is an aircraft with two large horizontal rotor assemblies mounted side by side.
An MV-22B Osprey lands aboard the USS Iwo Jima (LHD-7).
Hanna Reitsch in Fw 61 V2
An Mil V-12 at Monino Central Air Force Museum (Moscow)