Engine Model Free Piston Adjustable Speed External Combustion Engine with Horizontal Flywheel Physics Science Toy

Description: Item Name: Stirling Engine Model;  Size: 100*100*100 MM;  Product Weight: 320g;  Package Weight: 377g;  Material: Metal + Wood + Quartz Glass;  Applicable age: 14 years old and above;  Packing: Box;    Features: - Novel Design: The design of this Stirling engine model is novel and unique, with a simple and exquisite shape, and a sophisticated wooden base, which shows more high-end taste. The top knob can adjust the amount of air conduction to control the speed of the Stirling engine, which is easy to observe the dynamics of the piston and bring more good look.  - High Quality: The main parts are made of aluminum alloy and brass, which are sturdy and durable. The heating cylinder is made of quartz glass with low expansion coefficient and high temperature resistance; fine workmanship, perfect details, and a combination of texture and beauty.  - Fuel: 95% alcohol (need to be prepared by yourself), pay attention to not add water, kerosene, gasoline, lighter oil, liquor, etc.