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## Main Question or Discussion Point

Ok I have a design project that I am working on for the University this semester. Having a bit of problems trying to figure out and issue revolving around the wind force on our savonius blades. We are trying to make sure our blades will rotate with a wind speed of 10 mph. We have the blade total weight of approximately 75 lbs and are 6 feet tall by 4 feet wide. The bearings that the blades will be sitting and rotating on are tapered roller bearings, a set of two. I have read some where that my coefficient of friction for these bearings is around 0.0018 but to cover our selves I would like to use 0.05

Any formulas or directions on how to calculate this not just at 10 but other wind speeds would be wonderful.

Any formulas or directions on how to calculate this not just at 10 but other wind speeds would be wonderful.