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For experiments on the subject of motor - generator, also as a sub-area of alternative energies, for demonstrating the conversion of electrical energy into mechanical energy and vice versa; Propeller or windmill or fan, the shape is ideal for blowing by mouth or narrow-jet blower, attachable to 2 mm motor axlesMaterial: PlasticDimensions: D=47 mm, H=17 mmMass: 2gadditionally recommended: P3610-1M MBC motor/generator, SE