Horizon FCJJ Educational Renewable Energy Kits - Horizon FCJJ-39, 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 wind resistance, weight and angle. Ideal for performing the following wind energy experiments: How many blades are best - 1, 2, 3 ... more? Using three different curved blade shapes Using blades you make yourself Turbine efficiencies Measuring RPM Tuning for maximum power How blade angle or pitch affects output power Supplied with the kit: mini wind turbine (wind power generator), kit for learning about wind power energy, blade pitch, blade profile and number of blades can be evalua