This is a singlepiece low temperature Stirlingstyle engine designed for simple demonstration and handson learning. It runs with a small temperature difference, for example a mug of hot water, and will continue operating as long as the temperature difference is maintained. Key benefits Demonstrates heattomotion conversion using a low temperature difference, making it suitable for safe classroom demonstrations and tabletop experiments. Durable construction with corrosionresistant surface treatment for longterm use. Smooth, reliable motion enabled by precision bearings and hardened steel shafts. Features Low temperature operation: starts and runs from a modest heat source such as a mug of hot water. Materials: mirrorfinish stainless steel body, glass cylinder liner, bearing steel shafts, and zinc alloy flywheel. Precision components: precision bearings for consistent, lowfriction rotation. Corrosion protection: all parts have been surface treated to resist rust. Compact singlepiece design for easy setup and handling. How it works The engine converts a temperature difference into mechanical motion. Apply heat to the hot side and maintain a cooler side; the resulting expansion and contraction of the working gas drives the piston and flywheel, producing continuous rotation while the temperature difference exists. Typical use scenarios Classroom demonstration: show basic thermodynamics and mechanical principles during physics or engineering lessons. Student science projects: a practical exhibit for experiments on energy conversion and heat engines. Hobbyist desktop display: a handson model for exploring mechanics and precision components. Practical notes Requires a stable temperature difference between the hot side and the cold side to run continuously. Use careful handling with heat sources and avoid exposing components to corrosive substances despite surface treatment. Intended for educational and demonstrative use; not a power source for heavy loads. Materials and performance attributes Mirrorfinish stainless steel: durable exterior and easy to clean. Glass cylinder liner: smooth internal surface for piston movement. Precision bearings and bearing steel shafts: reduce friction and improve longevity. Zinc alloy flywheel: provides inertia for steady rotation. Surfacetreated components: improved resistance to rust for longer service life. This engine is suited to instructors, students, and hobbyists who need a compact, durable demonstration model that clearly illustrates low temperature heat engine principles.