Does it have to be aluminum? Looks like it could be replaced with thin PVC (or other plastic) sheets, which is cheap and also used in advertisement banners in m

Does it have to be aluminum? Looks like it could be replaced with thin PVC (or other plastic) sheets, which is cheap and also used in advertisement banners in most of the world. An induction motor works as a generator, a couple of old washing machine motors can work well. Some people made wind turbines out of LG washer radial motors.