![]() My generator is special, it's a hub motor for an electric bike, with permanent magnets, these motors have torque at low RPM, and operate with BMS controllers that make them work as generator when your bike is going down the hill. Of course the generator power and its optimal rotation speed is also needed to determine the operating point of the wind turbine. As you can see the choice of the right tool for you can be totally different depending on the wind speeds at your location. So in this case the average is not the right tool to use (because of the spread) and even the median seems to be influenced by this heavy spread, only the mode can fit our need. Here we can quickly see that it would be a sharp curve (following a logistic distribution not a normal) with a nice spread on the right (peak on the left, under the average). The skewness (gamma 1) and kurtosis give an idea of the kind of curve of the sample without drawing it. Remove unused columns and roughly estimate the wind speed with a few statistical functions: Average is a well known tool, median is little less known (as many days above as below this figure), and mode shows the most often speed (but we didn't split data in classes yet). ![]() Just open it with OpenOffice Calc (or Excel). Software requirements (to be installed on your computer): Heliciel (proprietary, ) jCAE 0.16 (open source, ) Visorium (french, freeware, ) Autodesk 123D Make (freeware, ) Adobe Reader (version 10 minimum to print posters) If using a scalpel, a cutting mat to make precise and clean cut. Calipers (just to measure some thickness). Fiberglass: Roving 500g / m² and 200g / m², with carbon fiber if possible, or designed for wind turbines ideally Epoxy Resin (laminating epoxy to prevent vapors from polyester and to master drying). Non permanent spray adhesive (in DIY store). Laser cutter or table saw for cutting wood stick (or jigsaw). Laser cutter or brand new scalpel or knife, to cut properly and without compressing cardboard (or scroll saw for MDF). A wood stick of section 30x30mm and 600mm long minimum. Materials needed: Cardboard (or MDF) of the same thickness and in good condition (not pressed or compressed) 594x840mm minimum. If you find this project green, worth a laser cutter, simply useful or beautiful, please vote for it by clicking on the "vote" button at the upper right corner of this page. With all this you're (almost) ready to start manufacturing wind turbines :) My goal is to show that a high tech industrial product can be made with a few tools, limited material and some knowledge (tricks?) and I hope to physically help make this kind of development in some parts of the world where you can't afford to buy such high end products but need them to generate green energy for local community development. After that we'll jump, and backflip like ninjas with file formats to land in 123D Make and finally build this blade. Beware my friend, it's a loooong and detailed instructable since professional wind turbine have many parameters to take in account. Special Parts (Available at the prototype of a wind turbine blade with fiber glass, cardboard, software, tools and affordable or free materials. This exploratory project teaches engineering and modeling and-to make it age- and skill-appropriate-can be scaled up or down in complexity to create more or less electricity, as well as to demonstrate concepts such as energy transformation and blade efficiencies. Learn how to capture the airstream's gusting force with this rugged PVC turbine design by Michael Arquin, founder of the KidWind Project. Over the past few years, wind power has been among the fastest growing sources of energy in the world. Renewable energy is the wind beneath our turbine blades.
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