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