Tamiya Friction Power Unit

Friction Power Unit #70222 Product Description This is a friction power unit, which can be used to power Educational Construction models and other creations. Spinning the drive wheel rotates the flywheel in the unit, which stores power and feeds it out through the shaft, to the crank wheels. Dimensions = length: 65mm, width (excluding shaft): 40mm, height: 50mm. Can be used with the extensive range of separately-sold Educational Construction Series items such as universal plates, arms, wheels, tracks and more! Unit features a clear ABS case. Gear ratios = 37.8:1 and 44.1:1 Features a front roller - by using kit-included crank wheels or fitting separately sold rear wheels such as those in Item 70193 Slim Tire Set (36mm, 55mm Diameter), the unit itself becomes a moving vehicle.