Compact working engine model designed for handson learning and mechanical demonstration. Built from stainless steel, aluminum alloy, alloy steel, brass, and bamboo, this engine illustrates basic thermodynamics and mechanical linkage while offering durable construction and precise motion. Key benefits Educational tool for learning principles of heat to mechanical energy conversion and basic engine mechanics. Practical handson assembly and operation experience that develops manual skills and understanding of physics. Compact, robust design with precision components for smooth, reliable running. Main features Materials: stainless steel, aluminum alloy, alloy steel, brass, and bamboo for strength and visual clarity. Precision bearing model F684ZZ for lowfriction rotary motion. Water cooling for more stable operating temperatures during demonstration. Flywheel diameter: 65 mm for steady rotational inertia. Piston diameter: 16 mm and piston stroke: 8 mm for clear reciprocating motion. Heating tube inner diameter: 16 mm to match piston and heating assembly. Compact size: 10.5 x 10.5 x 20 cm; product weight 850 g. Package content and packing 1 x Engine. Packaging: box. Package dimensions: 15 x 15 x 25 cm; package weight 950 g. Quick start instructions 1. Read these instructions before use. 2. Remove the alcohol lamp and add 95 percent alcohol only, filling no more than two thirds of the lamp container. 3. Ignite the alcohol lamp and heat the engine for about one minute. 4. Turn the flywheel by hand until the engine starts running on its own. Practical use scenarios Classroom demonstration: Show conversion of heat into mechanical motion during physics lessons or lab sessions. Hobbyist workshop: Use as a desktop working model for mechanical experimentation, tuning, and small repairs practice. Science fair or exhibition: Provide a visible, working example of piston and flywheel dynamics for public display. Why this engine stands out Combines durable mixedmetal construction with a precision bearing for reliable operation. Water cooling and a substantial flywheel improve running stability during demonstrations. Compact and portable format makes it easy to transport and set up for teaching, hobby, or display use. Education and skill value Suitable for students, educators, and hobbyists who want to expand knowledge of mechanical systems, practice handson skills, and encourage interest in physics and engineering.