Mini Hot Air Stirling Engine Motor Model Educational Toy Kits.    A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work.The engine is like a steam engine in that all of the engine's heat flows in and out through the engine wall.    Description: Speed:1300 to 1500 RPM;  Size: 100X45X50MM;  Material: Steel,copper and Aluminium,  Weight:200g;    Features: Using mold steel manufacturing, solid and firm;  Flywheel , fine milling, texture and beauty double combination; Rod made ??of stainless steel manufacturing;  Dynamic link sets of aluminum alloy cylinder, power cylinder and the power  piston is SUJ2 material fine grinding surface of special;  treatment, high  hardness. Do not wear high-speed ultra-long-running;  Heating cylinder of quartz glass;    Package included: 1 x Stirling engine model;  1 x Alcohol lamp (No alcohol included);  1 x spare parts piston