The STARPPOWER Vacuum Stirling Engine Motor Model is an educational toy that allows students to understand the internal and external combustion engines. It operates on the principle of using the inertia of the flywheel to drive the piston, which creates a vacuum state that generates negative pressure. This delicate and durable model is fully assembled and easy to use. Simply fire the alcohol burner and flip the flywheel until the machine can run on its own, with no need to add water. The model features a fine polished stainless steel body, a solid wood base, and fine copper axes. The all-metal hot gas cylinder and alcohol burner, along with the heat-resistant wick, are made of high-quality materials. This model clearly shows the movement of the valve and piston, providing a visual representation of how the engine works. It is an ideal educational model for experimental teaching and research. The STARPPOWER Vacuum Stirling Engine Motor Model comes with a base plate size of 15 * 7cm and weighs 282g. The package includes the engine model, a bottle, three wrenches, an alcohol burner, and an English user manual. Please note that alcohol is not included. Key Features: Operates on the principle of using the inertia of the flywheel to drive the piston Fully assembled and easy to use Fine polished stainless steel body and solid wood base Clearly shows the movement of the valve and piston Ideal educational model for experimental teaching and research Comes with a base plate size of 15 * 7cm Weighs 282g Includes an alcohol burner and English user manual