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Learn about gears and pneumatic-hydraulic engines with this hands-on science kit from Thames and Kosmos!
Build working models of an excavator, tank, backhoe, forklift, helicopter, and rocket car that are powered by the pumping action of water and air. The 45-page manual includes step-by-step illustrations for building 15 different models, including some that use a water recycling method. You can also perform experiments with how much water to add to the model. You provide one AA rechargeable battery.
WARNING: CHOKING HAZARD - Small parts. Not for children under 3 years.