A compact, metal Stirling engine model that converts heat into smooth, silent motion for desktop demonstration and study. Key benefits Clear demonstration of energy conversion: visibly turns heat from hot water into rotational motion, making thermodynamic principles tangible for students and hobbyists. Simple, loweffort operation: set on a cup of water heated above 90 C, preheat 30 seconds, and the flywheel begins to turn without complex setup. Durable and reliable for longterm use: primarily metal construction provides a solid feel and continuous running as long as a sufficient temperature difference is maintained. Quiet performance for shared spaces: runs silently, so it can be used on an office desk or in a classroom without distraction. Features and specifications Material: primarily metal with a polished metallic shine for an attractive desktop appearance. Function: Stirling engine model that converts thermal energy to mechanical motion via a flywheel. Performance: operates continuously while a sufficient temperature difference exists between the heat source and the cooler ambient air. Compatibility: designed to sit on a cup containing water heated above 90 C; suitable for standard cups or small heat sources that provide the required temperature. Size and placement: compact desktop footprint ideal for desks, lab benches, and demonstration tables. How to use Fill a cup with water heated to above 90 C. Place the engine on the cup and allow a 30 second preheat. Observe the flywheel turn as the engine converts heat into motion. The engine will continue to run while the temperature difference is maintained. Practical applications Educational demonstrations: show heat engines and energy conversion in physics or engineering classes. Science projects and labs: use as a visual component in experiments on thermodynamics and efficiency. Office and desk display: a quiet, mechanical conversation piece that illustrates basic engineering principles. Why this model stands out Metal construction and polished finish provide durability and an appealing look for desktop use. Straightforward operation requires no tools or power supply beyond a hot water source. Continuous and silent motion makes it suitable for repeated demonstrations and longterm display without interruption. Contents and care Metal Stirling engine model ready for placement on a cup with hot water. No special maintenance required beyond keeping moving parts of debris and using an appropriate heat source. Note Requires water temperature above 90 C and a sufficient temperature difference to run. Handle hot water with care.