# How fast is a wind turbine going at the tips at 20mph wind?

The TSR or tip speed ratio is used by wind turbine designers to properly match a set of blades to the turbine. The tip speed depends on the length of the blades and how many of them are used. Most wind turbines rotate between 10 and 20 revolutions per minute. That is one rotation every 3 to 6 seconds. The tip of the blade is moving 5 times faster than the flow of air so a 20 mph wind will make the tip move at 100 mph. The TSR is calculated by using the speed of the blade at its tip divided by the wind speed.
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