STEM Stirling Engine Model,Gamma-Type Low Temperature Difference & Gear Transmission Heat Engine with Piston,Silver Metal Desktop Collectible Gift for Hobbyists

【Gamma-Type LTD Stirling Engine】：This low temperature difference (LTD) Stirling engine features a gamma-type air displacement piston design with metal gear transmission and rolling bearing friction pairs for all moving parts. Its mirror-finished base and golden surface make it an exquisite desktop mechanical model 【Simple and Easy Operation】：Place the engine on a hot cup of water or coffee (90°C or higher), preheat for 30 seconds, and the swing flywheel will start operating smoothly. It is user-friendly, visually engaging, and perfect for demonstrating energy conversion with minimal setup 【Durable Continuous Operation】：Tested to run for at least 100 minutes continuously without stopping, this Stirling engine is silent, durable, and resistant to damage. As long as the temperature difference is maintained, it operates reliably, making it a stable and fascinating desktop science experiment 【Educational and Scientific Application】：Ideal for STEM projects, physics experiments, energy conversion studies, and teaching demonstrations, this engine allows users to intuitively explore mechanical motion, thermodynamics, and gear transmission principles while sparking curiosity and discussion 【Perfect Gift and Desktop Decoration】：Recommended for ages 16+, this gamma-type Stirling engine is a unique mechanical toy, collectible model, and educational tool. Its premium craftsmanship and functional design make it a superb birthday, Christmas, or school gift for friends, family, teachers, and model enthusiasts