Build five fun gadgets and learn about gears and transmissions. Create a helicopter model with a rotor that spins using a rubber band powered motor. Assemble a spinner toy that you wind up to launch a fast spinning top. Make a centripetal force machine that flings it’s arms outward at high speeds. Build a hand-mixer that demonstrates a gear train. Construct a cool aircraft launcher that flings a model across the room on a zip line. A 28 page manual guides your model building and experiments with step by step illustrated instructions.