I made it !!
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Thanks , if you are interested in my project vote for me if you like ♡ and also you can my other instructables that may you like .
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It depends on many things, not just on the size of the form, it depends on the dynamo that you may use (its ability to generates electricity as the form rotates), and it depends on the force of wind in the region that you put it in. In my project i use a small dynamo and a wheel with 38 cm raduis to light a lamp with a medium wind force, so if you want to generate a value of electricity you need mainly a big dynamo with a bigger form that fits with it and in a good place where there is wind.
Generator "Wheel Form"
awesome! creative idea.
very nice !