This readytorun 1/12 scale metal engine model kit recreates a closedcycle hot air pumping engine with working components and a watercooled circulation system. Built from brass and bamboo, it is designed for hobbyists, model builders, and educational demonstrations that require a realistic, compact running engine. Key benefits Working demonstration model that runs and generates motion for handson learning and display. Compact and durable construction using brass and bamboo for authentic look and reliable operation. Water pump cooling and fewer moving parts reduce maintenance and extend operating life for beginnerfriendly use. Ready to run out of the box with clear instructions and simple starting procedure. Core specifications Scale and type: 1/12 scale hot air pumping closedcycle engine model Materials: Brass and bamboo Form: Ready to run Cylinder diameter: 13 mm Stroke: 24 mm Speed range: 100 to 1000 rpm Continuous running time: Approximately 15 minutes per single tank Cooling mode: Water pump cooling, watercooled circulation system Product dimensions: 12.5 x 7.5 x 12.8 cm Product weight: 900 g Package dimensions: 20 x 20 x 20 cm Package weight: 1350 g Recommended age: 16 and up What is included Engine model x 1 Chimney x 1 Instructions x 1 Operation and starting steps 1. Fill the fuel tank and set the valve switch to open. 2. Add about 80 ml of water to the water tank. 3. Ignite the boiler under the engine and allow heating for about one minute. 4. Handcrank the flywheel to start the engine. 5. Monitor the water level and valve during operation to maintain a continuous running time of about 15 minutes per tank. Practical use scenarios Educational demonstrations: Show principles of closedcycle engines, heat to mechanical energy conversion, and water cooling in classroom or workshop settings. Hobby and display: Run the model on a desktop or in a collection to illustrate mechanical movement and period engine design. Science projects and museum exhibits: Use as a working example of smallscale pumping engines for historical and technical interpretation. Why choose this model Functional and reliable: Built to run with a stable watercooled system and simple maintenance needs. Clear educational value: Represents engines used historically for tasks such as water tank filling and building services, useful for teaching and demonstration. Suitable for beginners and experienced modelers: Readytorun format and straightforward starting routine reduce setup time while providing authentic mechanical operation. Service Customer satisfaction is supported by responsive and friendly service. If any issues arise, contact the seller for assistance as described in the included instructions.