The different results obtained at the Von Karman Institute can be analysed. They represent the evolution of the power coefficient ( percentage of the wind power converted in mechanical power) function of the tip speed ratio ( ratio between the speed at the end of the blades and the wind speed). The tip speed ratio of design was 3. We can see on our graphs that the power coefficient maximum is obtained for a tip speed ratio near the designed one. The power coefficient reaches 0.4 for the first set of blades and 0.38 for the second one. These values equal or exceed the values of others small wind turbines with wich which we compared our prototype.