This project we are testing the blade length of our turbines along with, the blade width, blade weight, number of blades, angle of blades, and how far away the turbine was away from the fan. The hardest part of the testing was for sure the angle of the blades because if you set the blades up in the wrong direction they wouldn't move, and if you didn't screw in the hub in all the way the blades would fly out and the angles would be all messed up and you'd have to start over. It was such a mess. The easiest for sure was the distance from the fan, because all we had to do was move the whole turbine away or closer. No moving the blades or having to add or take away a blade.