Build a model of a break-dancer that uses the gyroscope to spin and balance on its head. Construct a gyroscopic vehicle that keeps its balance like a Segway but with just one wheel. Assemble a cool robot that can zoom along a thin rail on two inline wheels without falling down. The lower part of this robot is a flywheel engine — a fast-rotating, weighted wheel that stores rotational energy and drives a gearwheel that moves the model forward. Even more models can be built using the flywheel function, including a motorbike, a space car, and a trike. A simple pull of a ripcord starts the gyroscope and flywheel spinning — no batteries required! The 32-page, full-color manual has illustrated step-by-step instructions.