Definitions for flywheelˈflaɪˌʰwil, -ˌwil

This page provides all possible meanings and translations of the word flywheel

Random House Webster's College Dictionary

fly•wheelˈflaɪˌʰwil, -ˌwil(n.)

  1. a heavy disk or wheel rotating on a shaft so that its momentum gives almost uniform rotational speed to the shaft and to all connected machinery.

    Category: Machinery

Origin of flywheel:


Princeton's WordNet

  1. flywheel(noun)

    regulator consisting of a heavy wheel that stores kinetic energy and smooths the operation of a reciprocating engine


  1. flywheel(Noun)

    a rotating mass used to maintain the speed of a machine within certain limits while the machine receives or releases energy at a varying rate

  2. Origin: fly + wheel


  1. Flywheel

    A flywheel is a rotating mechanical device that is used to store rotational energy. Flywheels have a significant moment of inertia and thus resist changes in rotational speed. The amount of energy stored in a flywheel is proportional to the square of its rotational speed. Energy is transferred to a flywheel by applying torque to it, thereby increasing its rotational speed, and hence its stored energy. Conversely, a flywheel releases stored energy by applying torque to a mechanical load, thereby decreasing its rotational speed. Three common uses of a flywheel include: ⁕They provide continuous energy when the energy source is discontinuous. For example, flywheels are used in reciprocating engines because the energy source, torque from the engine, is intermittent. ⁕They deliver energy at rates beyond the ability of a continuous energy source. This is achieved by collecting energy in the flywheel over time and then releasing the energy quickly, at rates that exceed the abilities of the energy source. ⁕They control the orientation of a mechanical system. In such applications, the angular momentum of a flywheel is purposely transferred to a load when energy is transferred to or from the flywheel.


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