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Build a working model of a jet engine with the Smithsonian Jet Engine Model Kit. You control the thrust and turbine speed. This educational Smithsonian kit requires only two "AA" batteries and offers an educational experience. Teaching basic aerodynamics, engineering and more, this kit is an excellent choice for satisfying inquisitive and curious minds. Assembled Product Dimensions (8 L x 12 W x 7.50 H Inches)