Package: sunnytech® package and sunnytech LOGO stickered Sunnytech®new Hot Air Stirling Engine Education Toy Kits Electricity Power Generator Sl02m Features: TWIN FLYWHEELS HOT AIR STIRLING ENGINE Speed:1300 to 1500 RPM Weight: 405g Size: 180mm X 90mm X 90mm Material: Glass, Wood and Aluminium What is the stirling engine? 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 engines heat flows in and out through the engine wall. How it works? This is traditionally known as an external combustion engine in contrast to an internal combustion engine where the heat input is by combustion of a fuel within the body of the working fluid. Unlike the steam engines use of water in both its liquid and gaseous phases as the working fluid, the Stirling engine encloses a fixed quantity of permanently gaseous fluid such as air or helium. As in all heat engines, the general cycle consists of compressing cool gas, heating the gas, expanding the hot gas, and finally cooling the gas before repeating the cycle. IMPORTANT: 1.Please adopt 95% to highgrade alcohol to be the fuel to make sure the air tank can get more temperature, and drive the stirling engine. 2.The temperature of Candles light is not workable for this toy, please pay attention.