My lab partners and I did an experiment for my general physics class in which we constructed a windmill with wooden dowels. We added clay to the ends to set the concentration of mass about the ends. The distance (radius) of the clay balls from the center of the fixed axis is our control variable. We were looking for the relationship between the radius which I believe contributes to I (moment of inertia) and angular velocity. Am I right to think that a fan or windmill is just like a hoop?