Key benefits Adjustable speed control lets you vary engine RPM while the unit runs, making it ideal for demonstrations of heat to motion conversion and for handson learning. Durable construction with glass, aluminum alloy, and solid wood components plus precise craftsmanship for reliable, long lasting use. Simple startup and operation make it accessible for students, hobbyists, and classroom use. What it does Small model heat engine that converts heat into rotary motion. Speed is adjusted by turning the knob on the of the engine while it is running. Designed for repeated demonstrations and practical experiments in mechanical principles. Materials and performance Main materials: glass, aluminum alloy, and solid wood. Precision assembly and fine workmanship enhance longevity and consistent performance. Runs on 95% fuel added to the built in fuel lamp (fuel not included). How to operate 1. Install the two knobs. 2. Fill the fuel lamp to two thirds with 95% fuel (not included). 3. Ignite the lamp and allow the engine to heat for about 30 seconds. 4. Turn the flywheel to start the engine, then adjust the knob to change speed. Suitable uses and scenarios Classroom demonstration: Show principles of thermodynamics and mechanical energy conversion during physics lessons. Science projects and experiments: Use for student experiments on engine behavior, speed control, and energy transfer. Hobby and gift: Present as a STEM gift for children, parents, friends, or hobbyists interested in mechanical models. What to know before use Fuel is not included. Use the specified 95% fuel and follow the operation steps for reliable starting. Includes two knobs and the engine assembly made from glass, aluminum alloy, and solid wood. This engine model is a practical, easy to operate tool for teaching, experimentation, and hands on mechanical learning, offering adjustable speed control and durable materials for ongoing use.