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Package: sunnytech® package and sunnytech LOGO stickered This is a Mini hot stirling engine, It's small size.You may receive and feel it's small, so please pay highly attention about the size before you click "BUY IT NOW" Features: Single FLYWHEEL HOT AIR STIRLING ENGINE MODEL:SZ001 (White) Speed:1300 to 1500 RPM Size: 54mm bottom diameter, 135mm height Material: Steel,copper and Aluminium, Weight:300g/ 10.58 oz. 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 Candle's light is not workable for this toy, please pay attention. 3. Usually it will last for about 3 minutes, and need cooling to restart. This is a vertical structure, the temperature of fire spread to the piston and reduce the temperature difference. If you want it last for longer, take a damp cloth to cover the cylinder body to take away the cylinder heat. No oil lubrication. 4.Product upgrade: we have transformed the stainless steel cylinder. The new product cylinder has 2 layers, and the inner layer is a stainless steel cylinder, and the outside is a glass material cylinder. packing list: 1* stirling engine 1* alcohol lamp The stirling is already assembled, you doesn't need to to do anything assemble work. 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 engine's heat flows in and out through the engine wall.