Rotational speed rotation revolution. Displaystyle text power text torquecdot 2pi cdot text rotational speed. Unlike linear speed it is defined by how many rotations an object makes in a period of time.
Constant angular momentum when no net torque.
This is the currently selected item. Take a number the next one in the sequence is the kilometres if the previous one was miles eg 50 mph is roughly 80 kph. The relationship between the absolute wind velocity V through the rotor the circumferential speed U of the element at radius r and the air velocity W relative to the blade section. Rotational speed rotation revolution.