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  2. Flywheel energy storage - Wikipedia

    en.wikipedia.org/wiki/Flywheel_energy_storage

    NASA G2 flywheel. Flywheel energy storage (FES) works by accelerating a rotor to a very high speed and maintaining the energy in the system as rotational energy.When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the system correspondingly results in an increase in the speed of the ...

  3. Engine balance - Wikipedia

    en.wikipedia.org/wiki/Engine_balance

    Two-plane, or dynamic, balancing is necessary if the out-of-balance couple at speed needs to be balanced. The second plane used is in the opposite wheel. Two-plane, or dynamic, balancing of a locomotive wheel set is known as cross-balancing. [11] Cross-balancing was not recommended by the American Railway Association until 1931.

  4. Flywheel - Wikipedia

    en.wikipedia.org/wiki/Flywheel

    The efficiency of a flywheel is determined by the maximum amount of energy it can store per unit weight. As the flywheel's rotational speed or angular velocity is increased, the stored energy increases; however, the stresses also increase. If the hoop stress surpass the tensile strength of the material, the flywheel will break apart.

  5. Kinetic energy recovery system - Wikipedia

    en.wikipedia.org/wiki/Kinetic_energy_recovery_system

    The 240 mm (9.4 in) diameter flywheel weighs 5.0 kg (11 lbs) and revolves at up to 64,500 rpm. Maximum torque at the flywheel is 18 Nm (13.3 ftlbs), and the torque at the gearbox connection is correspondingly higher for the change in speed. The system occupies a volume of 13 litres. [4]

  6. Balancing machine - Wikipedia

    en.wikipedia.org/wiki/Balancing_machine

    A balancing machine is a measuring tool used for balancing rotating machine parts such as rotors for electric motors, fans, turbines, disc brakes, disc drives, propellers and pumps. The machine usually consists of two rigid pedestals, with suspension and bearings on top supporting a mounting platform.

  7. Airbnb (ABNB) Q4 2024 Earnings Call Transcript - AOL

    www.aol.com/finance/airbnb-abnb-q4-2024-earnings...

    Free cash flow was $4.5 billion for the year, representing a free cash flow margin of 40%. And our strong balance sheet enabled us to repurchase $3.4 billion of common stock.

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