Wood and metal vacuum engine model designed for education and demonstration. The model clearly shows valve and piston movement and runs by flywheel inertia, providing a direct mechanical view of basic engine principles. Operation is simple: use a cotton stick to start the flywheel and observe the mechanism in motion. No water is required. Key benefits Teaches core engineering concepts through clear, visible motion of valves and pistons, helping visual learners grasp how combustion engines work. Simple, lowtech operation that requires only a cotton stick and a hand spin of the flywheel, making setup and demonstrations fast and reliable. Durable construction using wood and metal for a tactile, longlasting teaching aid that withstands regular classroom use. Lightweight and portable at 406g 14.3oz, suitable for carrying between classrooms or taking to lab sessions. Features Materials: Wood and metal construction for realism and durability. Power: Vacuum engine driven by flywheel inertia for a purely mechanical demonstration. Operation: No water required; start the model by rotating the flywheel with a cotton stick. Package weight: 406g 14.3oz. Included in the package: Bottle, engine wrench, hose, English instructions. Practical use scenarios Classroom demonstration: Use during physics or engineering lessons to illustrate piston motion, valve timing, and mechanical linkage. Student projects and labs: Integrate into handson activities where students observe and record mechanical behavior and basic thermodynamic concepts. Hobby or display model: Place on a desk or shelf as a working example of engine mechanics for selfstudy or discussion. What you get in the box Bottle Engine wrench Hose English instructions describing basic setup and operation Brief operating note The model runs by flywheel inertia. Use a cotton stick to rotate the flywheel and watch the valve and piston action. No water or external power source is needed.