Day 5 - Conclusion

Through 5 days with Canadian girls from Branksome Hall Canada, we created our own windmill with different angles, curves, sizes, lengths, and shapes of the blade. Our aim was to produce maximum power from the turbine, as efficiently as possible. Therefore, our question was: How do the angle, curve, size, length, and shape of the blade affect the amount of energy produced in our windmill? By our researches on day 1, we made a hypothesis that small angles, curves on the blade, small sizes and short length, and airfoil shaped blades will produce the most energy and power.

Independent variables are curve, length, shape, and angle of the blades, and dependent variables is power and total energy generated by our turbine. Independent variables and dependent variables are completely related, because as independent variable changes, dependent variables increase or decrease. The relationship can explained by the data (graph) which we collected from the experiment. On the first design, which included airfoil shape, little curved, short, and 15 degrees, produced least power and energy. Next one was little bit more knife shape, little curved, short, and 15 degrees, but produced second least power and energy. Finally, we changed the numbers of the blades, little curved, short, 15 degrees, and completely knife shaped, and it was the model which produced most power and energy. These data shows as independent variables change, dependent variables change: increase or decrease.

For the final design on first three designs, we changed the shape of the blades and numbers of the blades, which finally chosen to cutter blade and 6 blades for wind turbine. Then, we modified the final model to find the model which produces more power and energy. Thus, we put the short rib, which is more curved than other ribs, on the middle of the blade, cut the dowls, and change the degrees from 15 to 20, which produced most energy and power between previous models.

On our final design, we put blades on 20 degrees, short dowls (sticks) to make blades place closer to the middle to meet winds straightly, stick the rib on the blade to make curves on the blade, use cutter blade (knife shaped blade), short blades, and 6 blades to turn faster. This design maximized the electrical energy generated.