# How to calculate air velocity in a fan?

How to calculate air velocity in a fan and what data should I know ?

So if I have a fan motor, fan blade and a battery, what data should I get from these items ?

I think I will need to know the number of turns per second. How can I determine it ?

-
If you can find the power generated by the motor, you can use $W=\Delta k$ to find the velocity. Unfortunately I don't know of a way to find the power generated by the motor. –  udiboy1209 Jul 30 '13 at 12:27
The term for "number of turns per second" in physics is frequency. –  Constantine Aug 3 '13 at 19:17
If you actually have the fan you could use a Anemometer –  Michal Jan 26 at 19:42