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  2. Momentum theory - Wikipedia

    en.wikipedia.org/wiki/Momentum_Theory

    An actuator disk accelerating a fluid flow from right to left. In fluid dynamics, momentum theory or disk actuator theory is a theory describing a mathematical model of an ideal actuator disk, such as a propeller or helicopter rotor, by W.J.M. Rankine (1865), [1] Alfred George Greenhill (1888) and Robert Edmund Froude (1889).

  3. Brake pad - Wikipedia

    en.wikipedia.org/wiki/Brake_pad

    The brake pad and disc (now both having the friction material), then "stick" to each other, providing the friction that stops the vehicle. In disc brakes, there are usually two brake pads per disc rotor, they both function together. These are held in place and actuated by a caliper affixed to the wheel hub or suspension upright. Racing calipers ...

  4. Disk loading - Wikipedia

    en.wikipedia.org/wiki/Disk_loading

    When a helicopter is being maneuvered, its disk loading changes. The higher the loading, the more power needed to maintain rotor speed. [3] A low disk loading is a direct indicator of high lift thrust efficiency. [4] Increasing the weight of a helicopter increases disk loading. For a given weight, a helicopter with shorter rotors will have ...

  5. WVA number - Wikipedia

    en.wikipedia.org/wiki/WVA_number

    WVA numbers (Waren-Vertriebs-Artikel-Nummern) are a reference and assignment system for brake linings, clutch facings, brake shoes and other friction materials which will especially be used in road vehicles but also in mechanical engineering.

  6. Rotor solidity - Wikipedia

    en.wikipedia.org/wiki/Rotor_solidity

    Two rotors illustrating the geometric significance of rotor solidity ratio. The rotor on the right has a larger solidity ratio due to the blades covering a larger fraction of the net rotor disk area. A crude idea of what a rotor or propeller geometry looks like can be obtained from the rotor solidity ratio. Rotors with stubbier and/or a larger ...

  7. Disc brake - Wikipedia

    en.wikipedia.org/wiki/Disc_brake

    A disc brake is a type of brake that uses the calipers to squeeze pairs of pads against a disc (sometimes called a [brake] rotor) [1] to create friction. [2] There are two basic types of brake pad friction mechanisms: abrasive friction and adherent [ further explanation needed ] friction. [ 3 ]

  8. Bicycle brake - Wikipedia

    en.wikipedia.org/wiki/Bicycle_brake

    A disc brake consists of a metal disc, or "rotor", attached to the wheel hub that rotates with the wheel. Calipers are attached to the frame or fork along with pads that squeeze the rotors for braking. Disc brakes may be actuated mechanically by cable, or hydraulically.

  9. Hydraulic brake - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_brake

    US 2466990 Single disk brake. Johnson Wade C, Trishman Harry A, Stratton Edgar H. 1949-04-12; US 2416091 Fluid pressure control mechanism. Fitch 1947-02-12; US 2405219 Disk brake. Lambert Homer T. 1946-08-06; US 2375855 Multiple disk brake. Lambert Homer T. 1945-05-15; US 2366093 Brake. Forbes Joseph A. 1944-12-26; US 2140752 Brake. La Brie ...