Students build pressure-powered engines as they discover how air and water work together to produce force and momentum. Start with a hydro-pneumo system that uses a self-contained air and water turbine system, making it an ideal activity indoors or out. Take class outside and blast off with water-jet propelled vehicles. Incorporate the motors into one of 15 models including a truck, excavator, helicopter, and even a rocket car! Students work together to improve their designs and then race against other teams to see whose vehicle is the fastest. An included, 48-page teacher’s guide features full-color, step-by-step assembly and the related principles. Kit includes 165 pieces. See full contents list below. Recommended for Upper Elementary and up.