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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. Radio-controlled helicopter - Wikipedia

   en.wikipedia.org/wiki/Radio-controlled_helicopter

   90 size : Engine 0.9 cubic inch, Main Blades 690-710mm; Modern RC helicopters are generally classed by the length of the main blades (with few exceptions). Common classes are: Micro (under 200mm main blades) Mini (240-420mm blades) - classically called 300–450. 500 (425-500mm) 600 (600mm) 700 (standard competition size) 800

4. Swashplate (aeronautics) - Wikipedia

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

   Linkages (silver) to the rotor blade In aeronautics , a swashplate is a mechanical device that translates input via the helicopter flight controls into motion of the main rotor blades . Because the main rotor blades are spinning, the swashplate is used to transmit three of the pilot's commands from the non-rotating fuselage to the rotating ...

5. Helicopter flight controls - Wikipedia

   en.wikipedia.org/wiki/Helicopter_flight_controls

   Increase/decrease pitch angle of all main rotor blades equally, causing the aircraft to ascend/descend Increase/decrease torque. In some helicopters the throttle control(s) is a part of the collective stick. Rotor speed is kept basically constant throughout the flight. To adjust power through rotor blade pitch setting

6. BERP rotor - Wikipedia

   en.wikipedia.org/wiki/BERP_rotor

   The initial BERP rotor blades were developed in the late 1970s to mid-1980s as a joint venture programme between Westland Helicopters and the Royal Aircraft Establishment (RAE), with Professor Martin Lowson as a co-patentee. [1] The goal was to increase the helicopters lifting-capability and maximum speed using new designs and materials.

7. Cyclic/collective pitch mixing - Wikipedia

   en.wikipedia.org/wiki/Cyclic/collective_pitch_mixing

   To reduce the mechanical complexity, newer model helicopters use a software system (usually running on the transmitter) to mix the control inputs of three interdependent servos to control the swashplate. [2] The three servo linkages are arranged around the swashplate at 120° intervals (there is a variation that uses 140° + 140° + 80 ...