Variable Pitch Fan

Dear Kanmano,

Use Google Search " Variable Pitch Fans" - You will find a lot of information on this including some demos. I did the same on seeing your question.

Try to eat with your hands & not with somebody's spoon.

Manroop.Chennai.

Variable pitch fan.

It's a fan., Do you know what a fan is?

Fan blades have pitch. Do you know what pitch is?

The pitch is variable. Do you know what variable means?

I am being exceedingly sarcastic because I am trying to point out the essential folly of your question. All the necessary descriptive elements are in the name itself. If you don't already understand these basics, further explanation is an exercise in futility for us.

Besides, HOW it is accomplished is a long topic meant for those wishing to perhaps design one, and given the demonstrated lack of critical thinking you have displayed, I have my doubts as to whether that would be a good idea.

Further evidence to whit: you have posted a mechanical engineering question in an electrical engineering forum...