STEM Stirling Engine Model, Adjustable Speed Engine Model with Ball Bearing Flywheel, Aluminum Alloy Desktop Collectible Gift for Hobbyists

【Adjustable Speed Stirling Engine】：This Stirling engine model features a unique design with an adjustable top knob to control air conduction, allowing precise speed control. Users can observe piston dynamics clearly, providing an engaging hands-on demonstration of thermodynamic cycles and energy conversion 【High-Quality Metal Construction】：Crafted from aluminum alloy and brass with a quartz glass heating cylinder, this model combines durability, heat resistance, and low thermal expansion. The sturdy wooden base ensures stability, while the ball bearing flywheel ensures smooth, reliable operation for long-term use 【Simple Operation and Safe Use】：Add two-thirds of 95% alcohol (not included) to the included alcohol lamp, ignite, preheat for 30 seconds, and turn the flywheel to start the engine. Clear startup steps make it easy for students and hobbyists to operate safely while demonstrating the engine’s full working process 【Educational STEM Tool】：This model demonstrates the Stirling engine principle through cooling, compression, heat absorption, and air expansion in the cylinder. It provides an intuitive way to study physics concepts, mechanical motion, and energy transformation, making it ideal for classroom or home STEM experiments 【Perfect Desktop Decoration and Gift】：Recommended for ages 16+, this Stirling engine’s vivid red design, premium materials, and functional demonstration make it both an educational tool and a stylish desktop ornament. Ideal as a creative gift for family, friends, students, or science enthusiasts on birthdays and holidays