Hot Air Stirling Engine Motor Model Educational Toy Electricity Generator UNIQUE STYLING---- The power cylinder is separated from the thermal cylinder and then combined into a L shape. Different from other models, it attracts people's attention. It's really interesting and imaginative toy. EXTREMLY WELL-MADE---- The bottom plate is made of brushed aluminum alloy, exquisite and beautiful; The frame is finished with CNC, which shows that the sandblasting treatment is firm; Flywheel with aluminum alloy; Connecting rod made of stainless steel laser cutting; Heating cylinder for the custom-made thick glass material, long-term heating without pressure. overall model shape refined, combination of texture and beauty; EASY OPERATION & LONG LASTING----Fill the alcohol burner with your 95% alcohol (we recommend this fuel) and light it. Let the light burn the round ended cylinder for about 60-120 seconds, then give the wheel a gently push, it will run like a charm. YOU GET EXTRA BONUS EXCEPT THE STIRING----Still worry about the cylinder glass broken during shipment or usage? It did come with spare glass tubes, check the gallery picture. You can replace it fast and easily if any broken. PRIORITY GIFT OPTION FOR MANY APPLICATIONS----It is an amazing and fantastic product at this price. Its elegant gift package makes it spruce up and presentable. It has a wide range of application as, great gift for Kids' science project, Physical/mechanical learning, teachers Demo props on the class, birthday gift for friends, families, parents, kids, etc. Many of our customers come from school, colleague, etc. 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 engine's 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. We suggest you adopt at least 95% high grade alcohol to be the fuel. Because 95% high grade alcohol can produce enough hot power to drive the engine. By the heat from high grade alcohol, the engine will run madly and create the electricity. Product content: 1 set of engine models(without alcohol)