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2. Helicopter rotor - Wikipedia

   en.wikipedia.org/wiki/Helicopter_rotor

   An example of the effect of rotor blade number is the UH-72 (EC145 variant); the A model had four blades, but the UH-72B was changed to five blades which reduced vibration. [24] Other blade numbers are possible, for example, the CH-53K, a large military transport helicopter has a seven blade main rotor. [25]

3. Swashplate (aeronautics) - Wikipedia

   en.wikipedia.org/wiki/Swashplate_(aeronautics)

   This reduces rotor hub drag since there are no exposed linkages. A scaled model of an exhibition full-size mock-up of a single-rotor helicopter, proposed in 1912 by students of the IMTS headed by Boris Yuriev (1889-1957). No details of the mechanism are shown on the mock-up. Other swashplate and control design have been used.

4. Helicopter flight controls - Wikipedia

   en.wikipedia.org/wiki/Helicopter_flight_controls

   In a stationary hover, each rotor blade will experience the same airspeed at a constant RPM. In forward flight conditions, one rotor blade will be moving into the oncoming air stream while the other moves away from it. At certain airspeeds, this can create a dangerous condition in which the receding rotor blade stalls, causing unstable flight. [5]

5. Coaxial-rotor aircraft - Wikipedia

   en.wikipedia.org/wiki/Coaxial-rotor_aircraft

   A rotor blade produces more lift in the advancing half. As a blade moves toward the direction of flight, the forward motion of the aircraft increases the speed of the air flowing around the blade until it reaches a maximum when the blade is perpendicular to the relative wind. At the same time, a rotor blade in the retreating half produces less ...

6. Coning (aerodynamics) - Wikipedia

   en.wikipedia.org/wiki/Coning_(aerodynamics)

   The tips of the helicopter rotor blades move faster through the air than the parts of the blades near the hub, so they generate more lift, which pushes the tips of the blades upwards, resulting in a slight cone shape to the rotor disc. This is balanced by centrifugal force. If rotor RPM drops too low, the rotor blades fold up with no chance of ...

7. Rotorhead - Wikipedia

   en.wikipedia.org/wiki/Rotorhead

   The rotorhead is where the lift force from the rotor blades act. The rotorhead is connected to the main drive shaft via the Jesus nut, and houses several other components such as the swash plate, flight control linkages and fly-bars. [1] The rotor hub is also where the centre of gravity acts on the helicopter. The rotor head of a Sikorsky S-92

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9. Helicopter - Wikipedia

   en.wikipedia.org/wiki/Helicopter

   The rotor consists of a mast, hub and rotor blades. [citation needed] The mast is a cylindrical metal shaft that extends upwards from the transmission. At the top of the mast is the attachment point for the rotor blades called the hub. Main rotor systems are classified according to how the rotor blades are attached and move relative to the hub.