Feature:1. Clearly display the principle of aerodynamics.2. Teaching will be more intuitive and more interesting.3. Student can understand it quicker and better.4. The assembly process is quick and easily.5. The assembly process of the engine is quick and easily.6. 3. Children under 12-year-old should be accompanied by adult when using this product.Specification:This Stirling engine model can clearly explain the principle of aerodynamics. Features:How It WorksA Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work.Intuitive ExplanationTeaching will be more intuitive and more interesting.Easy to UnderstandStudent can understand it quicker and better.Easy to InstallThe assembly process is quick and easily.Specifications:Model: LL-002Material: Galvanized Iron Sheet &Speed: Up to 200rpmEngine Size: 16.2 * 8.8 * 8.3cm / 6.4 * 3.5 * 3.3"Engine Weight: 308g / 10.8ozPackage Size: 17.5 * 9.2 * 11cm / 6.9 * 3.6 * 4.3"Package Weight: 464g / 16.4ozPackage List:1 * Stirling Engine Self-assembly Kit1 * Alcohol Lamp (Without liquid)2 * Spare Tube1 * User Manual(English/Chinese)Note:1. should not be exposed to water after being heated, or otherwise it will split.2. If the alcohol is spill, please use wet cloth to put out the fire.3. Children under 12-year-old should be accompanied by adult when using this product.Package List:1 * Stirling Engine Self-assembly Kit1 * Alcohol Lamp (Without liquid)2 * Spare Tube1 * User Manual(English/Chinese)Note:1. should not be exposed to water after being heated, or otherwise it will split.2. If the alcohol is spill, please use wet cloth to put out the fire.3. Children under 12-year-old should be accompanied by adult when using this product.