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), Alfred George Greenhill (1888) and Robert Edmund Froude (1889). The rotor is modeled as an infinitely thin disc, inducing a constant velocity along the axis of rotation.
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), Alfred George Greenhill (1888) and Robert Edmund Froude (1889). The rotor is modeled as an infinitely thin disc, inducing a constant velocity along the axis of rotation.
Source: Wikipedia "Momentum theory" · CC BY-SA 4.0
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