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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.

  3. Rotorcraft - Wikipedia

    en.wikipedia.org/wiki/Rotorcraft

    A rotary-wing aircraft, rotorwing aircraft or rotorcraft is a heavier-than-air aircraft with rotary wings that spin around a vertical mast to generate lift. The assembly of several rotor blades mounted on a single mast is referred to as a rotor .

  4. Rotor wing - Wikipedia

    en.wikipedia.org/wiki/Rotor_wing

    Conventional rotary wings as used by modern rotorcraft. Spanwise horizontal-axis. Wing rotor: an airfoil-section horizontal-axis rotor which creates the primary lift. Magnus rotor: a rotor which creates lift via the Magnus effect. Flettner rotor: a smooth cylindrical Magnus rotor with disc end plates.

  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. Helicopter - Wikipedia

    en.wikipedia.org/wiki/Helicopter

    Conventional rotary-wing aircraft use a set of complex mechanical gearboxes to convert the high rotation speed of gas turbines into the low speed required to drive main and tail rotors. Unlike powerplants, mechanical gearboxes cannot be duplicated (for redundancy) and have always been a major weak point in helicopter reliability.

  7. Tiltrotor - Wikipedia

    en.wikipedia.org/wiki/Tiltrotor

    A tiltrotor is an aircraft that generates lift and propulsion by way of one or more powered rotors (sometimes called proprotors) mounted on rotating shafts or nacelles usually at the ends of a fixed wing. Almost all tiltrotors use a transverse rotor design, with a few exceptions that use other multirotor layouts.

  8. BERP rotor - Wikipedia

    en.wikipedia.org/wiki/BERP_rotor

    Tokyo Metropolitan Police Department EH101 (AW101) The BERP rotor blade design was developed under the British Experimental Rotor Programme.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]

  9. Brennan Helicopter - Wikipedia

    en.wikipedia.org/wiki/Brennan_Helicopter

    The Brennan Helicopter was a British rotary wing aircraft, developed by the Irish engineer and inventor Louis Brennan between the late 1910s and the mid-1920s. The helicopter was powered by a central engine through shafts to propellers mounted on two of the rotor blades. [1] [2]

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