4 Cylinder Hot Air Stirling Engine A precisionbuilt hot air Stirling engine designed for display, education, and handson tinkering. The engine converts heat from alcohol fuel into visible motion and lowvoltage electricity to power an included LED bulb, offering a reliable demonstration of thermal to mechanical energy conversion. Key benefits Clear demonstration of thermodynamics and mechanical motion for learning and display. Durable construction using aluminum alloy, CNC plate, and glass for longlasting operation. Simple operation: fill the fuel cylinders, light the wick, and watch continuous operation for extended periods. DIY friendly: the base can be customized for a display or educational project. Features and specifications Item type: 4 cylinder hot air Stirling engine. Materials: aluminum alloy, CNC plate, and glass. Size: approximately 195 x 105 x 135 mm (7.68 x 4.13 x 5.31 in). Fuel compatibility: supports 95 percent alcohol for performance. 75 percent alcohol can be used but will produce weaker power. Power output: includes a USB output interface and generates lowvoltage electricity to power the included LED light. This USB port does not support cell phone charging due to unstable heat source. LED display: engine generates power to run the LED bulb for an attractive visual effect. Runtime: with proper fuel and operation, the engine can run for many hours per fuel fill. Follow safe operating guidance for continuous use. Package contents 1 Host (main engine assembly) 2 Alcohol cylinders 2 Alcohol wick ropes 2 Alcohol cylinder covers 1 LED bulb 2 additional bulbs 1 Dropper 2 Glass tubes Typical use scenarios Educational demonstration: show how heat drives pistons and generates electricity in classroom, workshop, or home science projects. Desktop display: run the engine on the included LED bulb as a kinetic desk ornament or conversation piece. DIY : paint or modify the wooden base and involve students or family members in a handson build and personalization project. Operation notes and precautions For performance use grade alcohol such as 95 percent alcohol. 75 percent alcohol is supported but yields less power. The USB output is intended for lowpower demonstration only and is not suitable for charging mobile phones. Avoid running the engine at very speeds or continuously for long periods without monitoring. Allow cooling intervals as needed. Handle fuel and open flame with care. Use the dropper and covers provided to manage fuel safely. Because the flame can vary, expect some fluctuation in speed and electrical output. This Stirling engine kit provides a durable, easy to operate demonstration of hot air engine principles with parts included to run and your display.