Vogt and Dr. Barber incorporated numerical analysis and wind tunnels to perform the experiment. Wind tunnels are used to test smaller scale models, which is a plausible idea compared to using large amounts of money to build the real prototype and risking wasting time and money. During the experiment the angle of attack, i.e. the angle that the profile forms with respect to the wind direction, was kept constant while the altitude with respect to the ground surface was varied. Both airfoils were tested and the results were fully explained by Dr. Vogt and Dr. Barber (Vogt & Barber, 2012). The results and discussion consisted of numerous figures and graphs. The figures showed images of the two types of airfoils and illustrated how the wind influences the airfoil in terms of pressure force, normal force and downforce. The graphs showed the dependent variables while the independent variable varied. According to the conclusion, the results were significantly related to previous experiments; however, comparison and discussion are what differ because the two types of airfoils are never compared
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