RPM rotations per minute
rad/s radians per second (2π radians = 360°)
°/s degrees per second
All of these are rotational velocities. (ω)
You could also measure the tangential velocity (v) of the blades. That would be the speed the blades are moving at the tips in mph, kph, m/s, etc
ω = v/r where ω is in rad/time, r is the radius, so you can convert between rotational and tangential velocity
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