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Making a Personal fan from 120mm Computer fan? Answered

I've been asked to make a solar powered personal fan from a 120mm computer fan - This wasnt so hard, but when I powered it up it got me wondering, would reducing the amount of blades (currently 11) make it a more efficient personal cooling device?

Thanks :)


The blade pitch is the issue. Comptuer fans are made to pulll relatively low amounts of air out of the computer case. They are not designed as blowers.

My thinking is that reducing the number of blades will reduce the airflow. It might now spin faster with less load and use more current if its just a regular dc fan and not a brushless current controlled one.

In a nutshell... more efficient? probably not.

Thanking you :) - S'all I needed. Ha