This is a metal heat engine that differs from a regular Stirling model. Its mainly metal construction delivers quiet, stable operation and resists rust for long service life. The unit is designed for demonstration and handson learning rather than industrial use. Key benefits Quiet and stable running: metal construction reduces vibration and noise for smoother demonstrations. Durable and corrosion resistant: steel components provide longterm reliability and reduced maintenance. Controlled longterm heating: a heating cylinder designed for a custommade thick glass allows sustained heating without pressure buildup. Attractive base: brushed aluminum alloy bottom plate provides a neat, professional appearance. Simple startup: easy ignition procedure and gentle initial push get the wheel running reliably. Function and performance Primary function: a small thermal engine designed for visible conversion of heat to motion for educational purposes. Heating system: roundended heating cylinder works with a custom thick glass sleeve to maintain steady heat transfer during operation. Materials: mainly metal body with a brushed aluminum alloy bottom plate; surfaces treated to resist rust. Operation notes: fill the burning container with 95% fuel alcohol or an appropriate fuel, light it, allow the flame to heat the roundended cylinder for about 60 to 120 seconds, then give the wheel a gentle push. The engine will continue to run smoothly once started. Compatibility and fit Designed to work with the supplied or custommade thick glass heating cylinder. Intended for tabletop demonstrations and smallscale educational setups. Recommended use scenarios Classroom demonstration: show basic thermodynamics and mechanical energy conversion during physics lessons for middle and school students. Home science project: a handson activity for students and parents to explore heat engines and mechanical motion. Teacher or presenter prop: a reliable visual aid for lectures, science fairs, and workshops. Who will find this useful Teachers and educators seeking a durable demonstration device. Students working on physical or mechanical learning projects. Parents and families looking for an educational gift for kids interested in science. What is included and basic care Engine with metal frame and brushed aluminum alloy bottom plate; heating cylinder designed for a thick glass sleeve. Maintain clean metal surfaces and dry storage to extend life. Follow safe fuel handling and ignition practices when operating. This engine provides a reliable, easy to operate demonstration of heat to motion conversion with a durable metal build and an attractive base, well suited to classrooms, science projects, and educational displays.