The countersuit being that the larger the angles become the less surface areas and thus the windmill produces less power. . Number of blades: According to my own knowledge I predict that the more blades added to the wind mill will produce more power as there is more surface area for the wind to contact. My hypothesis was that the blade angles and also the number of blades would affect the power of a windmill as either variable is increased. This experiment proves my hypothesis correct in saying that more blades and the lower the angle is the more efficient the windmill will be.
As suspected the 4 blades turned out to produce almost double the power (0. 04 W) than the 2 blades did (0. 02 W). This observation has annotations that power is directly proportional to the number of blades but however the results can not only be dependant upon this as too few variations of trials were tested for a rounded, fair result. For the blade angles there was quite a obvious result that the 30i?? produced the highest power (0. 020 W) and quite a substantial difference of 0. 012 W, at (0. 08 W) for the 70i?? angle.
Limitations of the experiment would be that there was not a variation of shape of the blade and change of material. The wind speed and direction was another factor as this was not held constant during the trails. These factors if tweaked slightly could affect the results vastly. The measuring devices used could have been more precise. The wind speed and direction could have been kept constant by fixing the hairdryer in place at a certain angle and distance always from blades for fair results. Varying the blades shapes and material would give a better understanding and a more supporting experiment to prove the hypothesis with.