Page:Aerial Flight - Volume 2 - Aerodonetics - Frederick Lanchester - 1908.djvu/401

Rh the hoop A, which in effect is the same, so long as the wheel is not in rotation, an angular velocity will be communicated about the axis of the applied torque in accordance with the law, the

Fig. 168.

angular momentum Ιω (where Ι is moment of inertia and ω is angular velocity), being equal to the applied torque multiplied by the time of its application ; let us, however, suppose that the wheel be set in rapid rotation and examine the conditions that supervene. {[c|377}}