Horizon-Wind-Energy-Science-Kit-Horizon-FCJJ-39-p-This-wind-energy-science-kit-from-Horizon-allows-you-to-build-a-miniature-power-generation-system-that-converts-wind-into-electrical-energy-Experiment-with-the-pitch-angle-setting-of-turbine-blades-and-find-out-the-optimum-number-of-blades-for-generating-electricity-Nine-blades-with-three-types-of-profiled-blade-based-on-NASA-aeronautics-and-one-type-of-poly-propylene-sheet-blade-provide-the-opportunity-to-find-the-perfect-balance-of-wi