The trailing edge spoiler EvoFlap for the blade root area, divided into seven segments. Photo Credit: evoblade The wind energy start-up, evoblade, a spin-off of the Institute of Aerospace Technology (IAT) of the University of Applied Sciences Bremen (Germany), has developed a composite retrofittable trailing edge spoiler for rotor blades with the help of Deutsche Windtechnik AG (Bremen) and Wirtschaftsförderung Bremen. The results of a side-by-side testing and optimization study of the EvoFlap now confirm that installing the spoiler can improve the aerodynamic flow in the area of the blade root, resulting in improved efficiency and performance of the wind turbine system.