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  2. Disc brake - Wikipedia

    en.wikipedia.org/wiki/Disc_brake

    Discs for motorcycles, bicycles, and many cars often have holes or slots cut through the disc. This is done for better heat dissipation, to aid surface-water dispersal, to reduce noise, to reduce mass, or purely for non-functional aesthetics. [citation needed] Slotted discs have shallow channels machined into the disc to aid in removing dust ...

  3. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.

  4. Motorcycle braking systems - Wikipedia

    en.wikipedia.org/wiki/Motorcycle_braking_systems

    Larger rotors can be used to increase braking force, but this also increases weight and inertia. To overcome this brake manufacturers developed calipers four, six and even eight pistons. [14] Increasing the number of pistons increases the swept piston area, allowing for longer, narrower brake pads and smaller discs.

  5. Rotor (electric) - Wikipedia

    en.wikipedia.org/wiki/Rotor_(electric)

    A selection of various types of rotors Rotor from Hoover Dam generator. The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis. [1]

  6. Tail rotor - Wikipedia

    en.wikipedia.org/wiki/Tail_rotor

    Tail rotors are simpler than main rotors since they require only collective changes in pitch to vary thrust. The pitch of the tail rotor blades is adjustable by the pilot via the anti-torque pedals, which also provide directional control by allowing the pilot to rotate the helicopter around its vertical axis.

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